Hello,
syzbot found the following crash on:
HEAD commit: 7c6c54b505b8 Merge branch 'i2c/for-next' of git://git.kern..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1276246d400000
kernel config: https://syzkaller.appspot.com/x/.config?x=136ed5b316dbf1d8
dashboard link: https://syzkaller.appspot.com/bug?extid=70ab6a1f8151888c4ea0
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+70ab6a1f8151888c4...@syzkaller.appspotmail.com
------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint:
delayed_work_timer_fn+0x0/0x90 include/linux/compiler.h:179
WARNING: CPU: 1 PID: 17315 at lib/debugobjects.c:329
debug_print_object+0x16a/0x210 lib/debugobjects.c:326
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 17315 Comm: syz-executor5 Not tainted 4.19.0+ #281
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x39d lib/dump_stack.c:113
panic+0x2ad/0x55c kernel/panic.c:188
__warn.cold.8+0x20/0x45 kernel/panic.c:540
report_bug+0x254/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:966
RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326
Code: 60 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd
c0 c2 60 88 4c 89 fe 48 c7 c7 60 b8 60 88 e8 76 ea b5 fd <0f> 0b 83 05 11
01 82 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffff880192ea76e0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8165d6c5 RDI: 0000000000000005
RBP: ffff880192ea7720 R08: ffff880190074640 R09: ffffed003b5e3ef8
R10: ffffed003b5e3ef8 R11: ffff8801daf1f7c7 R12: 0000000000000001
R13: ffffffff895a51c0 R14: ffffffff816c19a0 R15: ffffffff8860bd00
__debug_check_no_obj_freed lib/debugobjects.c:786 [inline]
debug_check_no_obj_freed+0x3ae/0x58d lib/debugobjects.c:818
kfree+0xbd/0x230 mm/slab.c:3816
tls_sw_free_resources_tx+0x826/0xcf0 net/tls/tls_sw.c:1808
tls_sk_proto_close+0x602/0x750 net/tls/tls_main.c:278
inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1141
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffeccfec1d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000730870 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00000000e2abfaa8 R09: 00000000e2abfaac
R10: 00007ffeccfec100 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000512 R15: 0000000000000005
======================================================
WARNING: possible circular locking dependency detected
4.19.0+ #281 Not tainted
------------------------------------------------------
syz-executor5/17315 is trying to acquire lock:
00000000b56e5405 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70
kernel/locking/semaphore.c:136
but task is already holding lock:
000000008f462fd4 (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed
lib/debugobjects.c:777 [inline]
000000008f462fd4 (&obj_hash[i].lock){-.-.}, at:
debug_check_no_obj_freed+0x17a/0x58d lib/debugobjects.c:818
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&obj_hash[i].lock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
__debug_object_init+0x127/0x1290 lib/debugobjects.c:384
debug_object_init+0x16/0x20 lib/debugobjects.c:432
debug_hrtimer_init kernel/time/hrtimer.c:410 [inline]
debug_init kernel/time/hrtimer.c:458 [inline]
hrtimer_init+0x97/0x490 kernel/time/hrtimer.c:1308
init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1057
__sched_fork+0x2ae/0x590 kernel/sched/core.c:2166
init_idle+0x75/0x740 kernel/sched/core.c:5374
sched_init+0xb33/0xc07 kernel/sched/core.c:6057
start_kernel+0x4be/0xa2b init/main.c:608
x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:472
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #2 (&rq->lock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144
rq_lock kernel/sched/sched.h:1126 [inline]
task_fork_fair+0xb0/0x6d0 kernel/sched/fair.c:9768
sched_fork+0x443/0xba0 kernel/sched/core.c:2359
copy_process+0x25b8/0x87a0 kernel/fork.c:1886
_do_fork+0x1cb/0x11d0 kernel/fork.c:2213
kernel_thread+0x34/0x40 kernel/fork.c:2272
rest_init+0x28/0x372 init/main.c:409
arch_call_rest_init+0xe/0x1b
start_kernel+0x9f0/0xa2b init/main.c:745
x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:472
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #1 (&p->pi_lock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
try_to_wake_up+0xdc/0x1490 kernel/sched/core.c:1965
wake_up_process+0x10/0x20 kernel/sched/core.c:2129
__up.isra.1+0x1c0/0x2a0 kernel/locking/semaphore.c:262
up+0x13c/0x1c0 kernel/locking/semaphore.c:187
__up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:236
console_unlock+0x811/0x1190 kernel/printk/printk.c:2432
vprintk_emit+0x391/0x990 kernel/printk/printk.c:1922
vprintk_default+0x28/0x30 kernel/printk/printk.c:1964
vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
printk+0xa7/0xcf kernel/printk/printk.c:1997
check_stack_usage kernel/exit.c:755 [inline]
do_exit.cold.18+0x57/0x16f kernel/exit.c:916
do_group_exit+0x177/0x440 kernel/exit.c:970
__do_sys_exit_group kernel/exit.c:981 [inline]
__se_sys_exit_group kernel/exit.c:979 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:979
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 ((console_sem).lock){-.-.}:
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xae/0x1f0 kernel/printk/printk.c:219
console_trylock+0x15/0xa0 kernel/printk/printk.c:2247
console_trylock_spinning kernel/printk/printk.c:1653 [inline]
vprintk_emit+0x372/0x990 kernel/printk/printk.c:1921
vprintk_default+0x28/0x30 kernel/printk/printk.c:1964
vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
printk+0xa7/0xcf kernel/printk/printk.c:1997
__warn_printk+0x8c/0xe0 kernel/panic.c:594
debug_print_object+0x16a/0x210 lib/debugobjects.c:326
__debug_check_no_obj_freed lib/debugobjects.c:786 [inline]
debug_check_no_obj_freed+0x3ae/0x58d lib/debugobjects.c:818
kfree+0xbd/0x230 mm/slab.c:3816
tls_sw_free_resources_tx+0x826/0xcf0 net/tls/tls_sw.c:1808
tls_sk_proto_close+0x602/0x750 net/tls/tls_main.c:278
inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1141
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &rq->lock --> &obj_hash[i].lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&obj_hash[i].lock);
lock(&rq->lock);
lock(&obj_hash[i].lock);
lock((console_sem).lock);
*** DEADLOCK ***
3 locks held by syz-executor5/17315:
#0: 0000000097b82416 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock
include/linux/fs.h:757 [inline]
#0: 0000000097b82416 (&sb->s_type->i_mutex_key#11){+.+.}, at:
__sock_release+0x8b/0x250 net/socket.c:578
#1: 00000000ea6832e0 (sk_lock-AF_INET6){+.+.}, at: lock_sock
include/net/sock.h:1492 [inline]
#1: 00000000ea6832e0 (sk_lock-AF_INET6){+.+.}, at:
tls_sk_proto_close+0xf5/0x750 net/tls/tls_main.c:262
#2: 000000008f462fd4 (&obj_hash[i].lock){-.-.}, at:
__debug_check_no_obj_freed lib/debugobjects.c:777 [inline]
#2: 000000008f462fd4 (&obj_hash[i].lock){-.-.}, at:
debug_check_no_obj_freed+0x17a/0x58d lib/debugobjects.c:818
stack backtrace:
CPU: 1 PID: 17315 Comm: syz-executor5 Not tainted 4.19.0+ #281
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x39d lib/dump_stack.c:113
print_circular_bug.isra.35.cold.54+0x1bd/0x27d
kernel/locking/lockdep.c:1221
check_prev_add kernel/locking/lockdep.c:1863 [inline]
check_prevs_add kernel/locking/lockdep.c:1976 [inline]
validate_chain kernel/locking/lockdep.c:2347 [inline]
__lock_acquire+0x3399/0x4c20 kernel/locking/lockdep.c:3341
lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xae/0x1f0 kernel/printk/printk.c:219
console_trylock+0x15/0xa0 kernel/printk/printk.c:2247
console_trylock_spinning kernel/printk/printk.c:1653 [inline]
vprintk_emit+0x372/0x990 kernel/printk/printk.c:1921
vprintk_default+0x28/0x30 kernel/printk/printk.c:1964
vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398
printk+0xa7/0xcf kernel/printk/printk.c:1997
__warn_printk+0x8c/0xe0 kernel/panic.c:594
debug_print_object+0x16a/0x210 lib/debugobjects.c:326
__debug_check_no_obj_freed lib/debugobjects.c:786 [inline]
debug_check_no_obj_freed+0x3ae/0x58d lib/debugobjects.c:818
kfree+0xbd/0x230 mm/slab.c:3816
tls_sw_free_resources_tx+0x826/0xcf0 net/tls/tls_sw.c:1808
tls_sk_proto_close+0x602/0x750 net/tls/tls_main.c:278
inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428
inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458
__sock_release+0xd7/0x250 net/socket.c:579
sock_close+0x19/0x20 net/socket.c:1141
__fput+0x385/0xa30 fs/file_table.c:278
____fput+0x15/0x20 fs/file_table.c:309
task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48
83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffeccfec1d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000730870 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00000000e2abfaa8 R09: 00000000e2abfaac
R10: 00007ffeccfec100 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000512 R15: 0000000000000005
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
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