Public bug reported:
I was checking the 3.2.0-24.37~rc1 kernel (Andy built, for tests) when I
got hit by a slowpath warning very early in the boot process.
This only happened on generic-pae (AMD64 machine), and -- so far -- on
only one machine. I have no reproducer, although it happened at least
twice (see syslog attached).
Obviously this is *not* an official Ubuntu package. But it will be. Of
course, as a result, no apport magic.
Apr 25 16:58:15 alkaid kernel: [ 0.169354] Booting Node 0, Processors #1
Apr 25 16:58:15 alkaid kernel: [ 0.169355] smpboot cpu 1: start_ip = 82000
Apr 25 16:58:15 alkaid kernel: [ 5562.890150] ------------[ cut here
]------------
Apr 25 16:58:15 alkaid kernel: [ 5562.890154] WARNING: at
/home/apw/build/ubuntu-precise/ubuntu-precise/kernel/watchdog.c:241
watchdog_overflow_callback+0xac/0xd0()
Apr 25 16:58:15 alkaid kernel: [ 5562.890156] Hardware name: PowerEdge R210 II
Apr 25 16:58:15 alkaid kernel: [ 5562.890157] Watchdog detected hard LOCKUP on
cpu 0
Apr 25 16:58:15 alkaid kernel: [ 5562.890158] Modules linked in:
Apr 25 16:58:15 alkaid kernel: [ 5562.890160] Pid: 1, comm: swapper/0 Not
tainted 3.2.0-24-generic-pae #37~rc1
Apr 25 16:58:15 alkaid kernel: [ 5562.890161] Call Trace:
Apr 25 16:58:15 alkaid kernel: [ 5562.890165] [<c105a512>]
warn_slowpath_common+0x72/0xa0
Apr 25 16:58:15 alkaid kernel: [ 5562.890167] [<c10be48c>] ?
watchdog_overflow_callback+0xac/0xd0
Apr 25 16:58:15 alkaid kernel: [ 5562.890169] [<c10be48c>] ?
watchdog_overflow_callback+0xac/0xd0
Apr 25 16:58:15 alkaid kernel: [ 5562.890172] [<c10be3e0>] ?
touch_nmi_watchdog+0x70/0x70
Apr 25 16:58:15 alkaid kernel: [ 5562.890174] [<c105a5e3>]
warn_slowpath_fmt+0x33/0x40
Apr 25 16:58:15 alkaid kernel: [ 5562.890176] [<c10be48c>]
watchdog_overflow_callback+0xac/0xd0
Apr 25 16:58:15 alkaid kernel: [ 5562.890179] [<c10f1685>]
__perf_event_overflow+0x95/0x210
Apr 25 16:58:15 alkaid kernel: [ 5562.890182] [<c101edde>] ?
x86_perf_event_set_period+0x11e/0x220
Apr 25 16:58:15 alkaid kernel: [ 5562.890185] [<c10f1c75>]
perf_event_overflow+0x15/0x20
Apr 25 16:58:15 alkaid kernel: [ 5562.890187] [<c1022edd>]
intel_pmu_handle_irq+0x12d/0x1d0
Apr 25 16:58:15 alkaid kernel: [ 5562.890190] [<c1022535>] ?
intel_pmu_enable_all+0x45/0xa0
Apr 25 16:58:15 alkaid kernel: [ 5562.890193] [<c10ea63b>] ?
perf_ctx_unlock+0x1b/0x20
Apr 25 16:58:15 alkaid kernel: [ 5562.890195] [<c10f09f0>] ?
perf_rotate_context+0xf0/0x1b0
Apr 25 16:58:15 alkaid kernel: [ 5562.890197] [<c10f0b0b>] ?
perf_event_task_tick+0x5b/0x90
Apr 25 16:58:15 alkaid kernel: [ 5562.890201] [<c15a9990>]
perf_event_nmi_handler+0x20/0x30
Apr 25 16:58:15 alkaid kernel: [ 5562.890204] [<c15a924f>]
default_do_nmi+0x4f/0x280
Apr 25 16:58:15 alkaid kernel: [ 5562.890206] [<c108a004>] ?
tick_periodic+0x34/0x80
Apr 25 16:58:15 alkaid kernel: [ 5562.890209] [<c106151c>] ? irq_exit+0x3c/0xa0
Apr 25 16:58:15 alkaid kernel: [ 5562.890211] [<c15a94ef>] do_nmi+0x6f/0x80
Apr 25 16:58:15 alkaid kernel: [ 5562.890213] [<c15a8854>]
nmi_stack_correct+0x2f/0x34
Apr 25 16:58:15 alkaid kernel: [ 5562.890216] [<c12b60dd>] ?
delay_tsc+0x3d/0x70
Apr 25 16:58:15 alkaid kernel: [ 5562.890218] [<c12b6030>]
__const_udelay+0x20/0x30
Apr 25 16:58:15 alkaid kernel: [ 5562.890221] [<c158af19>]
wakeup_secondary_cpu_via_init+0x7b/0x1d3
Apr 25 16:58:15 alkaid kernel: [ 5562.890224] [<c158b2e3>]
do_boot_cpu+0x272/0x39e
Apr 25 16:58:15 alkaid kernel: [ 5562.890226] [<c158b40f>] ?
do_boot_cpu+0x39e/0x39e
Apr 25 16:58:15 alkaid kernel: [ 5562.890229] [<c158ba1f>]
native_cpu_up+0x9e/0xe6
Apr 25 16:58:15 alkaid kernel: [ 5562.890231] [<c105bff4>] ?
__cpu_notify+0x24/0x40
Apr 25 16:58:15 alkaid kernel: [ 5562.890233] [<c158cb39>] _cpu_up+0x83/0xeb
Apr 25 16:58:15 alkaid kernel: [ 5562.890235] [<c15a6b88>] ?
mutex_lock+0x18/0x40
Apr 25 16:58:15 alkaid kernel: [ 5562.890237] [<c158cbeb>] cpu_up+0x4a/0x59
Apr 25 16:58:15 alkaid kernel: [ 5562.890239] [<c15a6b88>] ?
mutex_lock+0x18/0x40
Apr 25 16:58:15 alkaid kernel: [ 5562.890242] [<c18959fc>] smp_init+0x39/0x7e
Apr 25 16:58:15 alkaid kernel: [ 5562.890245] [<c15760d3>] ?
register_cpu_notifier+0x23/0x30
Apr 25 16:58:15 alkaid kernel: [ 5562.890248] [<c187d817>]
kernel_init+0x85/0x145
Apr 25 16:58:15 alkaid kernel: [ 5562.890249] [<c187d792>] ?
start_kernel+0x35d/0x35d
Apr 25 16:58:15 alkaid kernel: [ 5562.890252] [<c15af6be>]
kernel_thread_helper+0x6/0x10
Apr 25 16:58:15 alkaid kernel: [ 5562.890257] ---[ end trace a7919e7f17c0a725
]---
Apr 25 16:58:15 alkaid kernel: [ 5563.092388] Initializing CPU#1
Apr 25 16:58:15 alkaid kernel: [ 5563.168372] CPU1: Thermal monitoring handled
by SMI
Apr 25 16:58:15 alkaid kernel: [ 5563.188421] NMI watchdog enabled, takes one
hw-pmu counter.
Apr 25 16:58:15 alkaid kernel: [ 5563.188495] CPU 2 irqstacks, hard=f7566000
soft=f7568000
Apr 25 16:58:15 alkaid kernel: [ 5563.188496] #2
Apr 25 16:58:15 alkaid kernel: [ 5563.188497] smpboot cpu 2: start_ip = 82000
Apr 25 16:58:15 alkaid kernel: [ 5563.198686] Initializing CPU#2
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: precise qa-manual-testing
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https://bugs.launchpad.net/bugs/988430
Title:
slowpath very early in the boot process
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