** Changed in: linux (Ubuntu Trusty)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1787258
Title:
3.13.0-155.205 Kernel Panic - divide by zero
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Trusty:
Fix Released
Bug description:
[Impact]
Booting the 3.13.0-155.205 generic kernel on a m3 AWS ec2 instance
results in a kernel panic during boot.
[Test Case]
Boot with the 3.13.0-155.205 kernel on an m3 instance and verify that
it panics on boot.
Boot a patched kernel on an m3 instance and verify that it boots,
without a panic, and that the following warning is present in the
kernel logs:
smpboot: x86_max_cores == zero !?!?
[Regression Potential]
The only potential for regressions is in systems that panic while
bootnig.
[Original Report]
We have updated our 14.04 aws ec2 instances from 3.13.0-153.204 to
3.13.0-155.205, and upon reboot they all kernel panic. full log
attached.
[ 0.064081] FEATURE SPEC_CTRL Not Present
[ 0.068730] mce: CPU supports 2 MCE banks
[ 0.072027] Last level iTLB entries: 4KB 512, 2MB 0, 4MB 0
[ 0.072027] Last level dTLB entries: 4KB 512, 2MB 0, 4MB 0
[ 0.080004] Spectre V2 mitigation: Mitigation: Full generic retpoline
[ 0.084004] Spectre V2 mitigation: Speculation control IBPB not-supported
IBRS not-supported
[ 0.088005] Speculative Store Bypass: Vulnerable
[ 0.092402] Freeing SMP alternatives memory: 32K (ffffffff81e7a000 -
ffffffff81e82000)
[ 0.104581] ACPI: Core revision 20131115
[ 0.111088] ACPI: All ACPI Tables successfully acquired
[ 0.114991] ftrace: allocating 28746 entries in 113 pages
[ 0.160066] divide error: 0000 [#1] SMP
[ 0.163922] Modules linked in:
[ 0.164000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-155-generic
#205-Ubuntu
[ 0.164000] Hardware name: Xen HVM domU, BIOS 4.2.amazon 08/24/2006
[ 0.164000] task: ffff8801e4828000 ti: ffff8801e4826000 task.ti:
ffff8801e4826000
[ 0.164000] RIP: 0010:[<ffffffff81d4b9f2>] [<ffffffff81d4b9f2>]
smp_store_boot_cpu_info+0x58/0x191
[ 0.164000] RSP: 0000:ffff8801e4827e98 EFLAGS: 00010286
[ 0.164000] RAX: 000000000000000e RBX: ffffffff81d18980 RCX:
0000000000000000
[ 0.164000] RDX: 0000000000000000 RSI: 00000000000000d0 RDI:
ffff8801efc13380
[ 0.164000] RBP: ffff8801e4827ec0 R08: ffffffff81d18988 R09:
0000000000000004
[ 0.164000] R10: ffffffff8180b6c0 R11: 0001f8ecf7bca282 R12:
0000000000013280
[ 0.164000] R13: 00000000ffffffff R14: 0000000000000100 R15:
000000000000d088
[ 0.164000] FS: 0000000000000000(0000) GS:ffff8801efc00000(0000)
knlGS:0000000000000000
[ 0.164000] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.164000] CR2: ffff8801effff000 CR3: 0000000001c0e000 CR4:
0000000000160670
[ 0.164000] Stack:
[ 0.164000] ffffffff81d18980 0000000000013280 0000000000000246
0000000000000100
[ 0.164000] 0000000000000000 ffff8801e4827ef0 ffffffff81d4bb82
ffffffff81e5df18
[ 0.164000] ffff8801e4828650 0000000000000246 0000000000000001
ffff8801e4827f00
[ 0.164000] Call Trace:
[ 0.164000] [<ffffffff81d4bb82>] native_smp_prepare_cpus+0x57/0x3e0
[ 0.164000] [<ffffffff81d404e1>] xen_hvm_smp_prepare_cpus+0x9/0x2e
[ 0.164000] [<ffffffff81d3a01b>] kernel_init_freeable+0xa7/0x1eb
[ 0.164000] [<ffffffff81727500>] ? rest_init+0x80/0x80
[ 0.164000] [<ffffffff8172750e>] kernel_init+0xe/0x130
[ 0.164000] [<ffffffff8174a88e>] ret_from_fork+0x6e/0xa0
[ 0.164000] [<ffffffff81727500>] ? rest_init+0x80/0x80
[ 0.164000] Code: 48 89 c7 41 83 cd ff 41 54 53 f3 a5 66 c7 80 da 00 00 00
00 00 be d0 00 00 00 0f b7 0d 20 a9 fc ff 8b 05 e2 c5 28 00 8d 44 01 ff <f7> f1
31 d2 89 05 c8 c2 fc ff 8d 81 ff 7f 00 00 f7 f1 89 c3 89
[ 0.164000] RIP [<ffffffff81d4b9f2>] smp_store_boot_cpu_info+0x58/0x191
[ 0.164000] RSP <ffff8801e4827e98>
[ 0.324006] ---[ end trace 8671c9f8a4dc811d ]---
[ 0.328017] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0000000b
[ 0.328017]
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