Public bug reported:
It was brought to me several situations where users where facing kernel
panics when machine was apparently idling (for some HP Proliant Servers
like DL 360, DL 380).
ILO:
"76 CriticalSystem Error03/12/2015 12:4203/12/2015 12:072 An
Unrecoverable System Error (NMI) has occurred (System error code
0x0000002B, 0x00000000)"
Examples:
PID: 0 TASK: ffffffff81c1a480 CPU: 0 COMMAND: "swapper/0"
#0 [ffff88085fc05c88] machine_kexec at ffffffff8104eac2
#1 [ffff88085fc05cd8] crash_kexec at ffffffff810f26a3
#2 [ffff88085fc05da0] panic at ffffffff8175b3f2
#3 [ffff88085fc05e20] sched_clock at ffffffff8101c3b9
#4 [ffff88085fc05e30] nmi_handle at ffffffff810170e8
#5 [ffff88085fc05e90] io_check_error at ffffffff8101758e
#6 [ffff88085fc05eb0] default_do_nmi at ffffffff810176a9
#7 [ffff88085fc05ed8] do_nmi at ffffffff810177d8
#8 [ffff88085fc05ef0] end_repeat_nmi at ffffffff8176da21
[exception RIP: native_safe_halt+6]
RIP: ffffffff81055186 RSP: ffffffff81c03e90 RFLAGS: 00000246
RAX: 0000000000000010 RBX: 0000000000000010 RCX: 0000000000000246
RDX: ffffffff81c03e90 RSI: 0000000000000018 RDI: 0000000000000001
RBP: ffffffff81055186 R8: ffffffff81055186 R9: 0000000000000018
R10: ffffffff81c03e90 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
ORIG_RAX: 0000000000000000 CS: 0010 SS: 0018
--- <DOUBLEFAULT exception stack> ---
#9 [ffffffff81c03e90] native_safe_halt at ffffffff81055186
#10 [ffffffff81c03e98] default_idle at ffffffff8101d37f
#11 [ffffffff81c03eb8] arch_cpu_idle at ffffffff8101dcaf
#12 [ffffffff81c03ec8] cpu_startup_entry at ffffffff810b5325
#13 [ffffffff81c03f40] rest_init at ffffffff81751a37
#14 [ffffffff81c03f50] start_kernel at ffffffff81d320b7
#15 [ffffffff81c03f90] x86_64_start_reservations at ffffffff81d315ee
#16 [ffffffff81c03fa0] x86_64_start_kernel at ffffffff81d31733
OR
PID: 0 TASK: ffffffff81c14440 CPU: 0 COMMAND: "swapper/0"
#0 [ffff880fffa07c40] machine_kexec at ffffffff8104b391
#1 [ffff880fffa07cb0] crash_kexec at ffffffff810d5fb8
#2 [ffff880fffa07d80] panic at ffffffff81730335
#3 [ffff880fffa07e00] hpwdt_pretimeout at ffffffffa02378b5 [hpwdt]
#4 [ffff880fffa07e20] nmi_handle at ffffffff8174a76a
#5 [ffff880fffa07ea0] default_do_nmi at ffffffff8174aacd
#6 [ffff880fffa07ed0] do_nmi at ffffffff8174abe0
#7 [ffff880fffa07ef0] end_repeat_nmi at ffffffff81749c81
[exception RIP: intel_idle+204]
RIP: ffffffff813f07ec RSP: ffffffff81c01d88 RFLAGS: 00000046
RAX: 0000000000000010 RBX: 0000000000000010 RCX: 0000000000000046
RDX: ffffffff81c01d88 RSI: 0000000000000018 RDI: 0000000000000001
RBP: ffffffff813f07ec R8: ffffffff813f07ec R9: 0000000000000018
R10: ffffffff81c01d88 R11: 0000000000000046 R12: ffffffffffffffff
R13: 0000000001c0d000 R14: ffffffff81c01fd8 R15: 0000000000000000
ORIG_RAX: 0000000000000000 CS: 0010 SS: 0018
--- <NMI exception stack> ---
#8 [ffffffff81c01d88] intel_idle at ffffffff813f07ec
#9 [ffffffff81c01dc0] cpuidle_enter_state at ffffffff815e76cf
It turned out that after investigating all idling situations and diverse
kernel dump files - where we had most of the CPUs either MWAITing and or
"relaxing", we discovered that HPWDT was loaded and corosync was opening
/dev/watchdog file, triggering the ILO watchdog timer and not updating
frequently enough as ILO expected.
As described in /etc/modprobe.d/blacklist-watchdog.conf:
"""
# Watchdog drivers should not be loaded automatically, but only if a
# watchdog daemon is installed.
"""
We should blacklist module "hpwdt" by default for all Ubuntu versions.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: cts
** Tags added: cts
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1432837
Title:
HP Proliant Servers - Kernel Panic - NMI - DL360 & DL380 - HPWDT
module loaded
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