On 7/11/19 1:40 PM, Peter Zijlstra wrote:
Hi,
Here's the latest (and hopefully final) set of tracing vs CR2 patches.
They are basically the same as v2, with only minor edits and tags collected
from the last review.
Please consider.
Hi,
I ran my own battery of tests on your patch set on top of
5ad18b2e60b75c7297a998dea702451d33a052ed and ran into this:
------------[ cut here ]------------
General protection fault in user access. Non-canonical address?
WARNING: CPU: 0 PID: 5039 at arch/x86/mm/extable.c:126
ex_handler_uaccess+0x5d/0x70
CPU: 0 PID: 5039 Comm: init Not tainted 5.2.0+ #124
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
RIP: 0010:ex_handler_uaccess+0x5d/0x70
Code: 5d 41 5c c3 e8 c4 8e 0e 00 80 3d e5 74 1e 01 00 75 d3 e8 b6 8e 0e
00 48 c7 c7 10 a7 fb 81 c6 05 d0 74 1e 01 01 e8 d1 43 01 00 <0f> 0b eb
b7 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89
RSP: 0000:fffffe000000fc48 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffffffff81c07dac RCX: ffffffff811a887c
RDX: 0000000000000000 RSI: ffffffff8289f05f RDI: 0000000000000093
RBP: fffffe000000fcb8 R08: 00000036fe0f15d3 R09: 000000000000003f
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000d
R13: 000000000000000d R14: 0000000000000000 R15: 0000000000000000
FS: 00005555563ab8c0(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000001ff7 CR3: 000000003c804002 CR4: 00000000003606f0
DR0: 0000000040209100 DR1: 00000000402091a1 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 00000000000b062a
Call Trace:
<#DB>
fixup_exception+0x50/0x6a
do_general_protection+0x40/0x160
general_protection+0x2d/0x40
RIP: 0010:arch_stack_walk_user+0x71/0x100
Code: 00 48 83 e8 10 49 39 c4 77 45 4c 8b 04 24 4c 89 e3 4d 89 fd 4c 89
fd 41 83 87 98 0a 00 00 01 0f 01 cb 0f ae e8 31 c0 4c 89 e2 <4c> 8b 33
4d 89 f4 85 c0 75 7a 48 8b 73 08 0f 01 ca 85 c0 74 1f 65
RSP: 0000:fffffe000000fd68 EFLAGS: 00050046
RAX: 0000000000000000 RBX: 854163717acc2789 RCX: ffffffff811ca27b
RDX: 854163717acc2789 RSI: 0000000040209102 RDI: fffffe000000fdb8
RBP: ffff88803d55d040 R08: ffffc9000520bf58 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 854163717acc2789
R13: ffff88803d55d040 R14: 0000000000000093 R15: ffff88803d55d040
? stack_trace_consume_entry+0x4b/0x80
? arch_stack_walk_user+0x34/0x100
? profile_setup.cold+0xc1/0xc1
stack_trace_save_user+0x71/0x9c
trace_buffer_unlock_commit_regs+0x1ae/0x270
trace_event_buffer_commit+0x90/0x240
trace_event_raw_event_preemptirq_template+0x9a/0x100
? debug+0x16/0x70
? perf_trace_preemptirq_template+0x120/0x120
? trace_hardirqs_off_thunk+0x1a/0x1c
trace_hardirqs_off_caller+0xf4/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? debug+0x11/0x70
debug+0x16/0x70
RIP: 0010:copy_user_generic_unrolled+0xa0/0xc0
Code: 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07
48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48
ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 0f 1f 40 00
RSP: 0000:ffffc9000520be38 EFLAGS: 00040202
RAX: ffff88803d55d09c RBX: ffff88803d55d040 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000040209102 RDI: ffffc9000520be76
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007ffffffff000
R13: 0000000040209102 R14: ffffc9000520be76 R15: 0000000000000000
</#DB>
__probe_kernel_read+0x57/0x90
is_prefetch.isra.0+0xb5/0x210
? tracer_hardirqs_on+0x53/0x1a0
__bad_area_nosemaphore+0x9e/0x220
__do_page_fault+0x483/0x630
? async_page_fault+0x8/0x40
async_page_fault+0x36/0x40
RIP: 0033:0x40209102
Code: 00 00 49 bc 00 20 23 40 00 00 00 00 49 bd 00 00 d0 40 00 00 00 00
49 be ff ff ff ff ff ff ff ff 49 bf 00 50 80 40 00 00 00 00 <9c> 48 81
0c 24 00 04 00 00 48 81 0c 24 00 00 04 00 9d ff 2c 25 00
RSP: 002b:0000000000001fff EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00000000402090b0 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000041ebb000
RBP: 854163717acc2789 R08: 0000000000000001 R09: b1f39cc399a61ebb
R10: 00007ffeab175000 R11: 0000000000000360 R12: 0000000040232000
R13: 0000000040d00000 R14: ffffffffffffffff R15: 0000000040805000
---[ end trace e5e49800ff5aa5ed ]---
PANIC: double fault, error_code: 0x0
CPU: 0 PID: 5039 Comm: init Tainted: G W 5.2.0+ #124
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f008 EFLAGS: 00010093
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f088 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00005555563ab8c0(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffe000000eff8 CR3: 000000003c804002 CR4: 00000000003606f0
DR0: 0000000040209100 DR1: 00000000402091a1 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000000b062a
Call Trace:
<#DB>
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f148 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f1c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f288 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f308 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f3c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f448 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f508 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f588 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f648 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f6c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f788 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f808 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f8c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f948 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000fa08 EFLAGS: 00010083 ORIG_RAX: 0000000000000000
RAX: 0000000000006004 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000006004 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000fa88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
async_page_fault+0x16/0x40
RIP: 0010:fixup_bad_iret+0x6/0x50
Code: 2d a8 00 00 00 48 39 f8 74 0b b9 15 00 00 00 48 89 c7 f3 48 a5 c3
0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 54 55 48 89 fd <65> 48 8b
3d a6 31 f2 7e 48 8b b5 a0 00 00 00 4c 8d a7 50 ff ff ff
RSP: 0000:fffffe000000fb48 EFLAGS: 00010082 ORIG_RAX: 0000000000000000
RAX: 800000003c804002 RBX: 0000000000000000 RCX: ffffffff81a00b97
RDX: 0000000000000000 RSI: ffffffff81a013a8 RDI: fffffe000000fb60
RBP: fffffe000000fb60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? native_iret+0x7/0x7
? general_protection+0x8/0x40
error_entry+0xe5/0xf0
RIP: 0010:native_irq_return_iret+0x0/0x2
Code: 5b 41 5b 41 5a 41 59 41 58 58 59 5a 5e 5f 48 83 c4 08 e9 0c 00 00
00 90 90 66 2e 0f 1f 84 00 00 00 00 00 f6 44 24 20 04 75 02 <48> cf 57
0f 01 f8 0f 1f 00 66 90 0f 20 df 48 0f ba ef 3f 48 81 e7
RSP: 0000:fffffe000000fc18 EFLAGS: 00010046 ORIG_RAX: 0000000000000000
RAX: fffffe000000fe08 RBX: ffffffff81c07dac RCX: ffff88803c824000
RDX: ffffffff8126a228 RSI: 0000000040209100 RDI: 0000000000000000
RBP: fffffe000000fcb8 R08: fffffe000000fec0 R09: ffffffff8125b177
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000d
R13: 000000000000000d R14: 0000000000000000 R15: 0000000000000000
? general_protection+0x8/0x40
? perf_exclude_event+0x67/0x90
? perf_bp_event+0x98/0xe0
RIP: 0000:0x2
Code: Bad RIP value.
RSP: 0000:0000000005080021 EFLAGS: 00000000
? ex_handler_uaccess+0x5d/0x70
? fixup_exception+0x50/0x6a
? do_general_protection+0x40/0x160
? general_protection+0x2d/0x40
? stack_trace_consume_entry+0x4b/0x80
? arch_stack_walk_user+0x71/0x100
? arch_stack_walk_user+0x34/0x100
? profile_setup.cold+0xc1/0xc1
? stack_trace_save_user+0x71/0x9c
? __this_cpu_preempt_check+0xc/0xc6
? hw_breakpoint_exceptions_notify+0x120/0x1c0
? notifier_call_chain+0x8e/0xb0
? atomic_notifier_call_chain+0x37/0x40
? notify_die+0x5c/0x80
? trace_hardirqs_off_caller+0x20/0x150
? trace_hardirqs_off_thunk+0x1a/0x1c
? debug_smp_processor_id+0x28/0xd0
? paranoid_exit+0xb/0xb0
? copy_user_enhanced_fast_string+0xe/0x20
</#DB>
WARNING: stack recursion on stack type 9
Kernel panic - not syncing: Machine halted.
CPU: 0 PID: 5039 Comm: init Tainted: G W 5.2.0+ #124
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
<#DF>
dump_stack+0xe1/0x133
panic+0x159/0x3d8
? get_cpu_entry_area+0x8/0x30
df_debug+0x24/0x2d
do_double_fault+0x94/0xf0
double_fault+0x2c/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f008 EFLAGS: 00010093
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f088 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
</#DF>
<#DB>
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f148 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f1c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f288 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f308 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f3c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f448 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f508 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f588 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f648 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f6c8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f788 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f808 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000f8c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000
RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000f948 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
async_page_fault+0x16/0x40
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50
Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41
5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b
04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00
RSP: 0000:fffffe000000fa08 EFLAGS: 00010083 ORIG_RAX: 0000000000000000
RAX: 0000000000006004 RBX: ffffffff81a01436 RCX: ffffffff81a00b97
RDX: 0000000000006004 RSI: ffffffff81a01428 RDI: ffffffff81a01436
RBP: fffffe000000fa88 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? async_page_fault+0x16/0x40
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
? async_page_fault+0x16/0x40
trace_hardirqs_off_caller+0x10/0x150
trace_hardirqs_off_thunk+0x1a/0x1c
? native_iret+0x7/0x7
? async_page_fault+0x8/0x40
async_page_fault+0x16/0x40
RIP: 0010:fixup_bad_iret+0x6/0x50
Code: 2d a8 00 00 00 48 39 f8 74 0b b9 15 00 00 00 48 89 c7 f3 48 a5 c3
0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 54 55 48 89 fd <65> 48 8b
3d a6 31 f2 7e 48 8b b5 a0 00 00 00 4c 8d a7 50 ff ff ff
RSP: 0000:fffffe000000fb48 EFLAGS: 00010082 ORIG_RAX: 0000000000000000
RAX: 800000003c804002 RBX: 0000000000000000 RCX: ffffffff81a00b97
RDX: 0000000000000000 RSI: ffffffff81a013a8 RDI: fffffe000000fb60
RBP: fffffe000000fb60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
? native_iret+0x7/0x7
? general_protection+0x8/0x40
error_entry+0xe5/0xf0
RIP: 0010:native_irq_return_iret+0x0/0x2
Code: 5b 41 5b 41 5a 41 59 41 58 58 59 5a 5e 5f 48 83 c4 08 e9 0c 00 00
00 90 90 66 2e 0f 1f 84 00 00 00 00 00 f6 44 24 20 04 75 02 <48> cf 57
0f 01 f8 0f 1f 00 66 90 0f 20 df 48 0f ba ef 3f 48 81 e7
RSP: 0000:fffffe000000fc18 EFLAGS: 00010046 ORIG_RAX: 0000000000000000
RAX: fffffe000000fe08 RBX: ffffffff81c07dac RCX: ffff88803c824000
RDX: ffffffff8126a228 RSI: 0000000040209100 RDI: 0000000000000000
RBP: fffffe000000fcb8 R08: fffffe000000fec0 R09: ffffffff8125b177
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000d
R13: 000000000000000d R14: 0000000000000000 R15: 0000000000000000
? general_protection+0x8/0x40
? perf_exclude_event+0x67/0x90
? perf_bp_event+0x98/0xe0
RIP: 0000:0x2
Code: Bad RIP value.
RSP: 0000:0000000005080021 EFLAGS: 00000000
? ex_handler_uaccess+0x5d/0x70
? fixup_exception+0x50/0x6a
? do_general_protection+0x40/0x160
? general_protection+0x2d/0x40
? stack_trace_consume_entry+0x4b/0x80
? arch_stack_walk_user+0x71/0x100
? arch_stack_walk_user+0x34/0x100
? profile_setup.cold+0xc1/0xc1
? stack_trace_save_user+0x71/0x9c
? __this_cpu_preempt_check+0xc/0xc6
? hw_breakpoint_exceptions_notify+0x120/0x1c0
? notifier_call_chain+0x8e/0xb0
? atomic_notifier_call_chain+0x37/0x40
? notify_die+0x5c/0x80
? trace_hardirqs_off_caller+0x20/0x150
? trace_hardirqs_off_thunk+0x1a/0x1c
? debug_smp_processor_id+0x28/0xd0
? paranoid_exit+0xb/0xb0
? copy_user_enhanced_fast_string+0xe/0x20
</#DB>
Kernel Offset: disabled
---[ end Kernel panic - not syncing: Machine halted. ]---
There's quite a bit to unpack there... I haven't looked into it AT ALL
yet, but at least you have the report. Will try to see if I can get a
reproducible test case.
Vegard
