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Subject3.0.3 kernel BUG at kernel/timer.c:1035
Got several of these (logged via netconsole):

kernel BUG at kernel/timer.c:1035!
invalid opcode: 0000 [#1]
PREEMPT
SMP

Modules linked in:
[last unloaded: scsi_wait_scan]


Pid: 0, comm: swapper Not tainted 3.0.3-x263 #1
Dell Inc. OptiPlex GX620
/0F8098

EIP: 0060:[<c107adfe>] EFLAGS: 00010812 CPU: 0
EIP is at cascade+0x6e/0x70
EAX: 6b6b6b6a EBX: c1bbb480 ECX: c1ac2d50 EDX: f541335c
ESI: c1ac2d50 EDI: f600bf60 EBP: f600bf74 ESP: f600bf5c
DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
Process swapper (pid: 0, ti=f600a000 task=c1aba320 task.ti=c1a94000)
Stack:
00000034
f541335c
c1ac2d50
c1bbb480
00000000
f600bfac
f600bfc0
c107af48

00000004
00000000
f600bfb8
c1069265
00000000
f600bfa8
c1bbc29c
c1bbc09c

c1bbbe9c
c106a28b
00000100
c1bbbc9c
c106a28b
00000100
00000041
c1a99a84

Call Trace:
[<c107af48>] run_timer_softirq+0x148/0x1e0
[<c1069265>] ? rebalance_domains+0x135/0x160
[<c106a28b>] ? get_parent_ip+0xb/0x40
[<c106a28b>] ? get_parent_ip+0xb/0x40
[<c1075098>] __do_softirq+0x78/0x100
[<c1075020>] ? local_bh_enable+0xa0/0xa0
<IRQ>

[<c10753ad>] ? irq_exit+0x5d/0x70
[<c104df53>] ? smp_apic_timer_interrupt+0x53/0x90
[<c178fa22>] ? apic_timer_interrupt+0x2a/0x30
[<c103d3ed>] ? mwait_idle+0x4d/0x80
[<c1034b0a>] ? cpu_idle+0x3a/0x80
[<c176dc3b>] ? rest_init+0x7b/0x80
[<c1b1471b>] ? start_kernel+0x2e2/0x2e8
[<c1b141c1>] ? loglevel+0x1a/0x1a
[<c1b140b3>] ? i386_start_kernel+0xb3/0xbb


Got one stack trace on 64 bit:

kernel BUG at kernel/timer.c:1035!
invalid opcode: 0000 [#1]
PREEMPT
SMP

CPU 1

Modules linked in:
vmthrottle
radeon
[last unloaded: scsi_wait_scan]


Pid: 4312, comm: qemu Not tainted 3.0.3-x263lm #1
Dell Inc. Dell DXP051
/0FJ030

RIP: 0010:[<ffffffff8109438b>]
[<ffffffff8109438b>] cascade+0x9b/0xa0
RSP: 0018:ffff8800dfc83e40 EFLAGS: 00210096
RAX: 6b6b6b6b6b6b6b6a RBX: ffff8800dfc83e40 RCX: ffff8800df0ad080
RDX: ffff8800dfc83e40 RSI: ffff8800daa7c838 RDI: ffff8800df0ac000
RBP: ffff8800dfc83e70 R08: ffff8800dfc8c640 R09: ffff8800dfc90df8
R10: 0000000000000001 R11: ffffffff8189c230 R12: ffff8800df0ac000
R13: ffff8800dfc83e40 R14: 0000000000000005 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8800dfc80000(0063) knlGS:00000000f760b770
CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b
CR2: 00000000080582b8 CR3: 00000000d1b44000 CR4: 00000000000026e0
DR0: 0000000000000001 DR1: 0000000000000002 DR2: 0000000000000001
DR3: 000000000000000a DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process qemu (pid: 4312, threadinfo ffff8800c6052000, task ffff8800d1ae9c80)
Stack:
ffff8800daa7c838
ffff8800daa7c838
0000000000000000
ffff8800df0ac000

0000000000000101
ffff8800dfc83eb0
ffff8800dfc83ef0
ffffffff81094653

ffff8800c6053fd8
ffff8800c6053fd8
ffff8800df0adc30
ffff8800df0ad830

Call Trace:
<IRQ>

[<ffffffff81094653>] run_timer_softirq+0x183/0x250
[<ffffffff81058398>] ? lapic_next_event+0x18/0x20
[<ffffffff810b35f7>] ? clockevents_program_event+0x57/0xa0
[<ffffffff8108d9da>] __do_softirq+0x9a/0x150
[<ffffffff8188625c>] call_softirq+0x1c/0x30
[<ffffffff8103ebe5>] do_softirq+0x65/0xa0
[<ffffffff8108d72d>] irq_exit+0x7d/0xa0
[<ffffffff81058c99>] smp_apic_timer_interrupt+0x69/0xa0
[<ffffffff81885d13>] apic_timer_interrupt+0x13/0x20
<EOI>

[<ffffffff810a4b99>] ? add_wait_queue+0x49/0x60
[<ffffffff81884914>] ? _raw_spin_unlock_irqrestore+0x44/0x50
[<ffffffff810a4b99>] ? add_wait_queue+0x49/0x60
[<ffffffff81132f2a>] __pollwait+0x7a/0x100
[<ffffffff8115eb97>] eventfd_poll+0x27/0x70
[<ffffffff81133ce6>] do_select+0x3d6/0x730
[<ffffffff81132eb0>] ? poll_freewait+0xc0/0xc0
[<ffffffff81132fb0>] ? __pollwait+0x100/0x100
last message repeated 5 times
[<ffffffff8108239d>] ? sub_preempt_count+0x9d/0xd0
[<ffffffff81081111>] ? get_parent_ip+0x11/0x50
[<ffffffff8108239d>] ? sub_preempt_count+0x9d/0xd0
[<ffffffff81882d53>] ? __mutex_lock_slowpath+0x2a3/0x350
[<ffffffff811663bc>] compat_core_sys_select+0x1fc/0x280
[<ffffffff81120ce1>] ? do_sync_read+0xd1/0x120
[<ffffffff81081111>] ? get_parent_ip+0x11/0x50
[<ffffffff81043ef6>] ? read_tsc+0x16/0x40
[<ffffffff810ae732>] ? ktime_get_ts+0xb2/0xe0
[<ffffffff811666fa>] compat_sys_select+0x4a/0x120
[<ffffffff810c382b>] ? compat_sys_gettimeofday+0xbb/0xd0
[<ffffffff8188631c>] sysenter_dispatch+0x7/0x32


In all these cases the issue was triggered by unplugging a mounted ext3
USB stick + an automated umount -l -f afterwards by udev using something
like the script below. A few seconds after the unplug+umount the system
crashed with the above traces, followed by a secondary

Kernel panic - not syncing: Fatal exception in interrupt

Unfortunately I'm unable to reproduce the issue right now so there must
be some unknown precondition or it is a race. Script:

--------
#!/bin/sh
#
# /etc/udev/rules.d/99-local.rules:
# SUBSYSTEM=="block", ACTION=="add|remove", RUN+="/usr/local/sbin/plugdev"

media_add()
{
mkdir -p /media/$dev
mount -t "$1" -o "$2" /dev/$dev /media/$dev
}

media_remove()
{
umount -f -l /media/$dev
rmdir /media/* 2>/dev/null
}

dev=`echo $DEVNAME|sed 's/.*\///'`
case "$ID_FS_TYPE.$ACTION.$dev" in
ext[234].add.?*)
media_add $ID_FS_TYPE nodev,nosuid
;;
vfat.add.?*)
media_add vfat umask=0
;;
*.remove.?*)
media_remove
;;
esac
--------

--
Frank


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