The command
ls /cdrom
caused autofs to kick in for mounting my SCSI CDROM. The following
modules where automatically loaded:
nls_iso8859-1 2052 1 (autoclean)
sr_mod 18236 1 (autoclean)
cdrom 13432 0 (autoclean) [sr_mod]
isofs 17720 1 (autoclean)
The mount expired and I did the following:
japetus ~# rmmod sr_mod
Segmentation fault
japetus ~# lsmod
Module Size Used by
nls_iso8859-1 2052 0 (autoclean)
lsmod: QM_INFO: No such file or directory
japetus ~#
The rmmod triggered the kernel oops, causing a segmentation fault. Here's
the log (Sorry for the long lines if it's inconvenient):
Jul 13 23:27:47 japetus kernel: Loaded 5709 symbols from /boot/System.map.
Jul 13 23:27:47 japetus kernel: Symbols match kernel version 2.2.10.
Jul 13 23:27:47 japetus kernel: Loaded 75 symbols from 8 modules.
Jul 13 23:27:47 japetus kernel: Linux version 2.2.10-ac8 (root@japetus.localdomain) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #1 Mon Jul 5 00:28:32 MEST 1999
...
Jul 13 23:29:46 japetus kernel: Detected scsi CD-ROM sr0 at scsi0, channel 0, id 6, lun 0
Jul 13 23:29:46 japetus kernel: Uniform CDROM driver Revision: 2.55
Jul 13 23:29:46 japetus kernel: sr0: CDROM (ioctl) reports ILLEGAL REQUEST.
Jul 13 23:30:50 japetus automount[687]: expired /misc/cd
Jul 13 23:32:22 japetus kernel: kfree: Bad obj 5a5a5a5a
Jul 13 23:32:22 japetus kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000
Jul 13 23:32:22 japetus kernel: current->tss.cr3 = 00856000, %cr3 = 00856000
Jul 13 23:32:22 japetus kernel: *pde = 00000000
Jul 13 23:32:22 japetus kernel: Oops: 0002
Jul 13 23:32:22 japetus kernel: CPU: 0
Jul 13 23:32:22 japetus kernel: EIP: 0010:[kfree+655/688]
Jul 13 23:32:22 japetus kernel: EFLAGS: 00010296
Jul 13 23:32:22 japetus kernel: eax: 0000001b ebx: 5a5a5a5a ecx: 00000018 edx: 00000023
Jul 13 23:32:22 japetus kernel: esi: c0007ea0 edi: 5a5a5a5a ebp: c28544a0 esp: c05c9f3c
Jul 13 23:32:22 japetus kernel: ds: 0018 es: 0018 ss: 0018
Jul 13 23:32:22 japetus kernel: Process rmmod (pid: 694, process nr: 45, stackpage=c05c9000)
Jul 13 23:32:22 japetus kernel: Stack: 5a5a5a5a c0007ea0 c0088000 c28544a0 a5c32f2b 000008b2 00000246 c0185036
Jul 13 23:32:22 japetus kernel: 5a5a5a5a 5a5a5a5a c018640b 5a5a5a5a 00000118 c2850000 c2850000 00000000
Jul 13 23:32:22 japetus kernel: bffffac8 c01864f6 c28544a0 c2851bcc 00000004 c28544a0 c0114690 c2850000
Jul 13 23:32:22 japetus kernel: Call Trace: [st:st_template+111296/62948801] [scsi_init_free+54/64] [scsi_unregister_device+91/176] [st:st_template+93728/62966369] [st:st_template+93728/62966369] [scsi_unregister_module+54/64] [st:st_template+111296/62948801]
Jul 13 23:32:22 japetus kernel: [st:st_template+100844/62959253] [st:st_template+111296/62948801] [free_module+32/160] [st:st_template+93728/62966369] [sys_delete_module+308/480] [st:st_template+93728/62966369] [system_call+52/56]
Jul 13 23:32:22 japetus kernel: Code: c7 05 00 00 00 00 00 00 00 00 83 c4 08 5b 5e 5f 5d 83 c4 0c
The whole problem is very reproducable.
I've tried to use ksymoops but it didn't add any info. See attachments (they were
made after a reboot).
-- Frank--jI8keyz6grp/JLjh Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="ksymoops.out"
Options used: -V (default) -o /lib/modules/2.2.10-ac8/ (default) -k /proc/ksyms (default) -l /proc/modules (default) -m /boot/System.map (specified) -c 1 (default)
Warning in compare_ksyms_lsmod, module bsd_comp is in lsmod but not in ksyms, probably no symbols exported Warning in compare_ksyms_lsmod, module umsdos is in lsmod but not in ksyms, probably no symbols exported Jul 13 23:32:22 japetus kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000 Jul 13 23:32:22 japetus kernel: current->tss.cr3 = 00856000, %cr3 = 00856000 Jul 13 23:32:22 japetus kernel: *pde = 00000000 Jul 13 23:32:22 japetus kernel: Oops: 0002 Jul 13 23:32:22 japetus kernel: CPU: 0 Jul 13 23:32:22 japetus kernel: EIP: 0010:[kfree+655/688] Jul 13 23:32:22 japetus kernel: EFLAGS: 00010296 Jul 13 23:32:22 japetus kernel: eax: 0000001b ebx: 5a5a5a5a ecx: 00000018 edx: 00000023 Jul 13 23:32:22 japetus kernel: esi: c0007ea0 edi: 5a5a5a5a ebp: c28544a0 esp: c05c9f3c Jul 13 23:32:22 japetus kernel: ds: 0018 es: 0018 ss: 0018 Jul 13 23:32:22 japetus kernel: Process rmmod (pid: 694, process nr: 45, stackpage=c05c9000) Jul 13 23:32:22 japetus kernel: Stack: 5a5a5a5a c0007ea0 c0088000 c28544a0 a5c32f2b 000008b2 00000246 c0185036 Jul 13 23:32:22 japetus kernel: 5a5a5a5a 5a5a5a5a c018640b 5a5a5a5a 00000118 c2850000 c2850000 00000000 Jul 13 23:32:22 japetus kernel: bffffac8 c01864f6 c28544a0 c2851bcc 00000004 c28544a0 c0114690 c2850000 Jul 13 23:32:22 japetus kernel: Call Trace: [st:st_template+111296/62948801] [scsi_init_free+54/64] [scsi_unregister_device+91/176] [st:st_template+93728/62966369] [st:st_template+93728/62966369] [scsi_unregister_module+54/64] [st:st_template+111296/62948801] Jul 13 23:32:22 japetus kernel: Code: c7 05 00 00 00 00 00 00 00 00 83 c4 08 5b 5e 5f 5d 83 c4 0c
Code: 00000000 Before first symbol 00000000 <_IP>: <=== Code: 00000000 Before first symbol 0: c7 05 00 00 00 00 00 movl $0x0,0x0 <=== Code: 00000007 Before first symbol 7: 00 00 00 Code: 0000000a Before first symbol a: 83 c4 08 addl $0x8,%esp Code: 0000000d Before first symbol d: 5b popl %ebx Code: 0000000e Before first symbol e: 5e popl %esi Code: 0000000f Before first symbol f: 5f popl %edi Code: 00000010 Before first symbol 10: 5d popl %ebp Code: 00000011 Before first symbol 11: 83 c4 0c addl $0xc,%esp
2 warnings issued. Results may not be reliable.
--jI8keyz6grp/JLjh Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="lsmod.out"
Module Size Used by ppp_deflate 41060 0 (autoclean) bsd_comp 3728 0 (autoclean) ppp 20492 2 (autoclean) [ppp_deflate bsd_comp] slhc 4424 1 (autoclean) [ppp] wd 4596 1 (autoclean) 8390 6340 0 (autoclean) [wd] autofs 9316 1 (autoclean) st 25248 0 (unused) nls_cp437 3580 1 (autoclean) umsdos 24792 1 (autoclean) msdos 5372 1 (autoclean) [umsdos] fat 30880 1 (autoclean) [umsdos msdos]
--jI8keyz6grp/JLjh--
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