strace causes the kernel to croak:
cd /tmp
strace ls
*BOOM*
Nov 18 15:44:31 tux6127 kernel: [ 221.522945] c0126b5b
Nov 18 15:44:31 tux6127 kernel: [ 221.523069] PREEMPT SMP DEBUG_PAGEALLOC
Nov 18 15:44:31 tux6127 kernel: [ 221.523268] Modules linked in: autofs4 parport_pc parport
floppy rtc i2c_i801 i2c_core generic usbhid uhci_hcd tg3 snd_intel8x0 snd_ac97_codec snd_ac97_bus
snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc ehci_hcd usbcore mousedev
e1000 bcm5700 unix
Nov 18 15:44:31 tux6127 kernel: [ 221.524392] CPU: 0
Nov 18 15:44:31 tux6127 kernel: [ 221.524393] EIP: 0060:[<c0126b5b>] Not tainted VLI
Nov 18 15:44:31 tux6127 kernel: [ 221.524394] EFLAGS: 00010202 (2.6.15-rc1-mm2)
Nov 18 15:44:31 tux6127 kernel: [ 221.524525] EIP is at ptrace_check_attach+0x24/0xc4
Nov 18 15:44:31 tux6127 kernel: [ 221.524570] eax: 00000001 ebx: 00000000 ecx: 00000001
edx: c0561e00
Nov 18 15:44:31 tux6127 kernel: [ 221.524617] esi: fffffffd edi: 00000000 ebp: f4edbf90
esp: f4edbf80
Nov 18 15:44:31 tux6127 kernel: [ 221.524663] ds: 007b es: 007b ss: 0068
Nov 18 15:44:31 tux6127 kernel: [ 221.524707] Process strace (pid: 3895, threadinfo=f4edb000
task=f6a6d9d0)
Nov 18 15:44:31 tux6127 kernel: [ 221.524753] Stack: c01273cc 00000000 00000000 00000018 f4edbfb4
c0127430 00000000 00000000
Nov 18 15:44:31 tux6127 kernel: [ 221.525159] 00005007 00000000 00000018 00000000 b7fbc138
f4edb000 c0102e6f 00000018
Nov 18 15:44:31 tux6127 kernel: [ 221.525564] 00000f38 00000001 00000000 b7fbc138 bfce55d8
0000001a 0000007b c010007b
Nov 18 15:44:31 tux6127 kernel: [ 221.525970] Call Trace:
Nov 18 15:44:31 tux6127 kernel: [ 221.526065] [<c0103dbc>] show_stack+0x80/0x96
Nov 18 15:44:31 tux6127 kernel: [ 221.526195] [<c0103f55>] show_registers+0x161/0x1c5
Nov 18 15:44:31 tux6127 kernel: [ 221.526324] [<c0104173>] die+0x12e/0x1b6
Nov 18 15:44:31 tux6127 kernel: [ 221.526451] [<c042bf0b>] do_page_fault+0x300/0x608
Nov 18 15:44:31 tux6127 kernel: [ 221.526583] [<c0103a67>] error_code+0x4f/0x54
Nov 18 15:44:31 tux6127 kernel: [ 221.526712] [<c0127430>] sys_ptrace+0x52/0xd2
Nov 18 15:44:31 tux6127 kernel: [ 221.526840] [<c0102e6f>] sysenter_past_esp+0x54/0x75
Nov 18 15:44:31 tux6127 kernel: [ 221.526969] ---------------------------
Nov 18 15:44:31 tux6127 kernel: [ 221.527021] | preempt count: 00000002 ]
Nov 18 15:44:31 tux6127 kernel: [ 221.527072] | 2 level deep critical section nesting:
Nov 18 15:44:31 tux6127 kernel: [ 221.527125] ----------------------------------------
Nov 18 15:44:31 tux6127 kernel: [ 221.527178] .. [<c042b1ec>] .... _read_lock+0x18/0x8e
Nov 18 15:44:31 tux6127 kernel: [ 221.527270] .....[<c0126b5b>] .. ( <=
ptrace_check_attach+0x24/0xc4)
Nov 18 15:44:31 tux6127 kernel: [ 221.527363] .. [<c042b12e>] .... _spin_lock_irqsave+0x1b/0x9d
Nov 18 15:44:31 tux6127 kernel: [ 221.527456] .....[<c0104089>] .. ( <= die+0x44/0x1b6)
Nov 18 15:44:31 tux6127 kernel: [ 221.527548]
Nov 18 15:44:31 tux6127 kernel: [ 221.527597] Code: 43 7c e9 69 ff ff ff 55 b8 00 1e 56 c0 89 e5
83 ec 10 89 5d f4 89 75 f8 89 7d fc 8b 5d 08 8b 7d 0c be fd ff ff ff e8 79 46 30 00 <8b> 53 10 f6
c2 01 74 11 8b 8b c4 00 00 00 b8 00 f0 ff ff 21 e0
Nov 18 15:44:31 tux6127 kernel: [ 221.530117] <3>Debug: sleeping function called from invalid
context at include/linux/rwsem.h:43
Nov 18 15:44:31 tux6127 kernel: [ 221.530254] in_atomic():1, irqs_disabled():0
Nov 18 15:44:31 tux6127 kernel: [ 221.530312] [<c0103df0>] dump_stack+0x1e/0x22
Nov 18 15:44:31 tux6127 kernel: [ 221.530454] [<c011b38e>] __might_sleep+0xa7/0xaf
Nov 18 15:44:31 tux6127 kernel: [ 221.530602] [<c011ee22>] profile_task_exit+0x22/0x60
Nov 18 15:44:31 tux6127 kernel: [ 221.530752] [<c0120e09>] do_exit+0x1d/0x4aa
Nov 18 15:44:31 tux6127 kernel: [ 221.530896] [<c01041fb>] do_divide_error+0x0/0xc3
Nov 18 15:44:31 tux6127 kernel: [ 221.531040] [<c042bf0b>] do_page_fault+0x300/0x608
Nov 18 15:44:31 tux6127 kernel: [ 221.531178] [<c0103a67>] error_code+0x4f/0x54
Nov 18 15:44:31 tux6127 kernel: [ 221.531307] [<c0127430>] sys_ptrace+0x52/0xd2
Nov 18 15:44:31 tux6127 kernel: [ 221.531435] [<c0102e6f>] sysenter_past_esp+0x54/0x75
Nov 18 15:44:31 tux6127 kernel: [ 221.531575] ---------------------------
Nov 18 15:44:31 tux6127 kernel: [ 221.531629] | preempt count: 00000001 ]
Nov 18 15:44:31 tux6127 kernel: [ 221.531698] | 1 level deep critical section nesting:
Nov 18 15:44:31 tux6127 kernel: [ 221.531760] ----------------------------------------
Nov 18 15:44:31 tux6127 kernel: [ 221.531818] .. [<c042b1ec>] .... _read_lock+0x18/0x8e
Nov 18 15:44:31 tux6127 kernel: [ 221.531916] .....[<c0126b5b>] .. ( <=
ptrace_check_attach+0x24/0xc4)
Nov 18 15:44:31 tux6127 kernel: [ 221.532016]
Nov 18 15:44:31 tux6127 kernel: [ 221.532130] ---------------------------
Nov 18 15:44:31 tux6127 kernel: [ 221.532184] | preempt count: 00000001 ]
Nov 18 15:44:31 tux6127 kernel: [ 221.532239] | 1 level deep critical section nesting:
Nov 18 15:44:31 tux6127 kernel: [ 221.532295] ----------------------------------------
Nov 18 15:44:31 tux6127 kernel: [ 221.532351] .. [<c042b1ec>] .... _read_lock+0x18/0x8e
Nov 18 15:44:31 tux6127 kernel: [ 221.532450] .....[<c0126b5b>] .. ( <=
ptrace_check_attach+0x24/0xc4)
Nov 18 15:44:31 tux6127 kernel: [ 221.532557]
Nov 18 15:44:41 tux6127 kernel: [ 231.047393]
Nov 18 15:44:41 tux6127 kernel: [ 231.047446] Pid: 3895, comm: strace
Nov 18 15:44:41 tux6127 kernel: [ 231.047501] EIP: 0060:[<c042b429>] CPU: 0
Nov 18 15:44:41 tux6127 kernel: [ 231.047559] EIP is at _write_lock_irqsave+0x78/0x9d
Nov 18 15:44:41 tux6127 kernel: [ 231.047614] EFLAGS: 00000202 Not tainted (2.6.15-rc1-mm2)
Nov 18 15:44:41 tux6127 kernel: [ 231.047670] EAX: 00000001 EBX: 00000286 ECX: c0561e00 EDX:
00000001
Nov 18 15:44:41 tux6127 kernel: [ 231.047727] ESI: c0561e00 EDI: f4edb000 EBP: f4edbe30 DS: 007b
ES: 007b
Nov 18 15:44:41 tux6127 kernel: [ 231.047823] CR0: 8005003b CR2: 00000010 CR3: 005aa000 CR4:
00000640
Nov 18 15:44:41 tux6127 kernel: [ 231.047881] ---------------------------
Nov 18 15:44:41 tux6127 kernel: [ 231.047935] | preempt count: 00010001 ]
Nov 18 15:44:41 tux6127 kernel: [ 231.047988] | 1 level deep critical section nesting:
Nov 18 15:44:41 tux6127 kernel: [ 231.048041] ----------------------------------------
Nov 18 15:44:41 tux6127 kernel: [ 231.048096] .. [<c042b1ec>] .... _read_lock+0x18/0x8e
Nov 18 15:44:41 tux6127 kernel: [ 231.048191] .....[<c0126b5b>] .. ( <=
ptrace_check_attach+0x24/0xc4)
Nov 18 15:44:41 tux6127 kernel: [ 231.048289]
-Kenny
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