Hi Ian and all
Using RHEL4 WS with the latest kernel (kernel-smp-2.6.9-78.0.5.EL) and autofs
(autofs5-5.0.1-0.rc2.88) rpms, I can reliably crash (read "kernel panic") the
OS.
To crash,
1) open a couple of terminals (I logged on to tty1 and tty2)
2) in one terminal run "while :; do ls -lR /autofs/point/mount/* ; done"
3) in the other run "while :; do service autofs5 restart; done"
4) profit!
While this is a contrived scenario we noticed the panic on a couple of cluster
nodes (run RHEL 4u7 WS) when they didn't pick up some new autofs map entries.
Service autofs5 reload didn't help so I did a service autofs5 restart and
panics soon followed.
I've setup diskdump and now have a vmcore file. Running 'crash
/boot/System.map-2.6.9-78.0.5.ELsmp
/usr/lib/debug/lib/modules/2.6.9-78.0.5.ELsmp/vmlinux
/var/crash/127.0.0.1-2008-10-20-09\:44/vmcore' shows:
---
crash 4.0-5.0.0.1
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Red Hat, Inc.
Copyright (C) 2004, 2005, 2006 IBM Corporation
Copyright (C) 1999-2006 Hewlett-Packard Co
Copyright (C) 2005, 2006 Fujitsu Limited
Copyright (C) 2006, 2007 VA Linux Systems Japan K.K.
Copyright (C) 2005 NEC Corporation
Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. Enter "help copying" to see the conditions.
This program has absolutely no warranty. Enter "help warranty" for details.
GNU gdb 6.1
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-unknown-linux-gnu"...
SYSTEM MAP: /boot/System.map-2.6.9-78.0.5.ELsmp
DEBUG KERNEL: /usr/lib/debug/lib/modules/2.6.9-78.0.5.ELsmp/vmlinux
(2.6.9-78.0.5.ELsmp)
DUMPFILE: /var/crash/127.0.0.1-2008-10-20-09:44/vmcore [PARTIAL DUMP]
CPUS: 2
DATE: Mon Oct 20 09:44:24 2008
UPTIME: 00:04:26
LOAD AVERAGE: 0.24, 0.22, 0.10
TASKS: 95
NODENAME: lws075
RELEASE: 2.6.9-78.0.5.ELsmp
VERSION: #1 SMP Wed Sep 24 05:40:24 EDT 2008
MACHINE: x86_64 (2133 Mhz)
MEMORY: 4 GB
PANIC: "Oops: 0002 [1] SMP " (check log for details)
PID: 23840
COMMAND: "automount5"
TASK: 101205e1030 [THREAD_INFO: 1011a692000]
CPU: 0
STATE: TASK_RUNNING (PANIC)
crash> bt
PID: 23840 TASK: 101205e1030 CPU: 0 COMMAND: "automount5"
#0 [1011a693d20] start_disk_dump at ffffffffa01b1377
#1 [1011a693d50] try_crashdump at ffffffff8014cda9
#2 [1011a693d60] do_page_fault at ffffffff80124ae8
#3 [1011a693e40] error_exit at ffffffff80110e1d
[exception RIP: fput]
RIP: ffffffff8017ca06 RSP: 000001011a693ef0 RFLAGS: 00010246
RAX: 0000000000000002 RBX: 0000000000009362 RCX: 0000000000000000
RDX: 0000000000009362 RSI: 00000101198b8bc0 RDI: 0000000000000000
RBP: 0000000000000000 R8: 0000000000000000 R9: 0000000000000000
R10: 0000000000000000 R11: 0000000000009362 R12: 00000101199218c0
R13: 00000101198b8bc0 R14: 0000010119837270 R15: 0000000000000003
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#4 [1011a693ef0] autofs4_catatonic_mode at ffffffffa0a45df2
#5 [1011a693f10] autofs4_root_ioctl at ffffffffa0a45b74
#6 [1011a693f40] sys_ioctl at ffffffff8018dc6d
#7 [1011a693f80] system_call at ffffffff801102f6
RIP: 0000002a95946f59 RSP: 0000000040621a98 RFLAGS: 00000246
RAX: 0000000000000010 RBX: ffffffff801102f6 RCX: 0000002a95677486
RDX: 0000000000000000 RSI: 0000000000009362 RDI: 0000000000000003
RBP: 000000552abfc930 R8: 0000000000000000 R9: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000552abfbe10
R13: 000000552abfbe10 R14: 0000000000000000 R15: 000000552ac17390
ORIG_RAX: 0000000000000010 CS: 0033 SS: 002b
crash> ps 23840
PID PPID CPU TASK ST %MEM VSZ RSS COMM
> 23840 1 0 101205e1030 RU 0.0 23036 1820 automount5
Crash> log
Bootdata ok (command line is ro root=LABEL=/ quiet reboot=h ide=nodma vga=1
bfsort swiotlb=65536)
Linux version 2.6.9-78.0.5.ELsmp ([EMAIL PROTECTED]) (gcc version 3.4.6
20060404 (Red Hat 3.4.6-10)) #1 SMP Wed Sep 24 05:40:24 EDT 2
008
BIOS-provided physical RAM map:
snip
MSI INIT SUCCESS
tg3: eth0: Link is up at 1000 Mbps, full duplex.
tg3: eth0: Flow control is off for TX and off for RX.
nvidia: module license 'NVIDIA' taints kernel.
ACPI: PCI Interrupt 0000:01:00.0[A] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:01:00.0 to 64
NVRM: loading NVIDIA UNIX x86_64 Kernel Module 169.09 Fri Jan 11 14:04:37 PST
2008
Unable to handle kernel NULL pointer dereference at 0000000000000028 RIP:
<ffffffff8017ca06>{fput+0}
PML4 119d23067 PGD 0
Oops: 0002 [1] SMP
CPU 0
Modules linked in: autofs4 nvidia(U) i2c_core cpufreq_powersave ide_dump
scsi_dump diskdump zlib_deflate dm_mirror dm_multipath joydev dm_mod button
battery
ac uhci_hcd ehci_hcd snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_timer
snd soundcore snd_page_alloc tg3 floppy ext3 jbd ata_piix libata sd_mod scsi
_mod
Pid: 23840, comm: automount5 Tainted: P 2.6.9-78.0.5.ELsmp
RIP: 0010:[<ffffffff8017ca06>] <ffffffff8017ca06>{fput+0}
RSP: 0018:000001011a693ef0 EFLAGS: 00010246
RAX: 0000000000000002 RBX: 0000000000009362 RCX: 0000000000000000
RDX: 0000000000009362 RSI: 00000101198b8bc0 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000009362 R12: 00000101199218c0
R13: 00000101198b8bc0 R14: 0000010119837270 R15: 0000000000000003
FS: 0000000040624960(005b) GS:ffffffff8050d200(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000028 CR3: 0000000000101000 CR4: 00000000000006e0
Process automount5 (pid: 23840, threadinfo 000001011a692000, task
00000101205e1030)
Stack: ffffffffa0a45df2 0000000000009362 0000000000000000 00000101199218c0
ffffffffa0a45b74 0000000000009362 0000000000000000 0000000000000000
00000101198b8bc0 00000000ffffffe7
Call Trace:<ffffffffa0a45df2>{:autofs4:autofs4_catatonic_mode+94}
<ffffffffa0a45b74>{:autofs4:autofs4_root_ioctl+300}
<ffffffff8018dc6d>{sys_ioctl+853} <ffffffff801102f6>{system_call+126}
Code: f0 ff 4f 28 0f 94 c0 84 c0 74 05 e9 a6 fe ff ff c3 41 55 41
RIP <ffffffff8017ca06>{fput+0} RSP <000001011a693ef0>
CR2: 0000000000000028
---
There is pretty much nothing useful in /var/log/messages or /var/log/daemon
What additional info can I provide to help with this?
CC
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