Steps to reproduce: while true; do modprobe xfs; rmmod xfs; done vs while true; do cat /proc/kallsyms >/dev/null; done
[where xfs could be any module, I haven't tried] BUG: unable to handle kernel paging request at virtual address e19f808c printing eip: c01dc361 *pde = 1ff5f067 *pte = 00000000 Oops: 0000 [#1] PREEMPT Modules linked in: CPU: 0 EIP: 0060:[<c01dc361>] Not tainted VLI EFLAGS: 00010297 (2.6.21-rc3-8b9909ded6922c33c221b105b26917780cfa497d #2) EIP is at vsnprintf+0x2af/0x48c eax: e19f808c ebx: ffffffff ecx: e19f808c edx: fffffffe esi: dbe7aa84 edi: dbe2bf3c ebp: ffffffff esp: dbe2bec4 ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068 Process cat (pid: 7242, ti=dbe2b000 task=df5790b0 task.ti=dbe2b000) Stack: e19d6fde 00000000 00000010 00000008 ffffffff 00000001 00000598 dbe7aa68 0002f362 00000010 dbe7b000 00000000 ffffffff c034bbe0 dbe7aa68 dfd31880 dfa31e80 00001000 c01586b0 dbe2bf2c dbe2bf2c dfd31880 dfd31880 c01289f6 Call Trace: [<c01586b0>] seq_printf+0x2e/0x4b [<c01289f6>] s_show+0x4b/0x7f [<c0158c6e>] seq_read+0x196/0x278 [<c0158ad8>] seq_read+0x0/0x278 [<c0143c35>] vfs_read+0x72/0x93 [<c0143f1c>] sys_read+0x41/0x67 [<c0102486>] sysenter_past_esp+0x5f/0x85 ======================= Code: 74 24 28 73 03 c6 06 20 46 4d 85 ed 7f f1 e9 b9 00 00 00 8b 0f 81 f9 ff 0f 00 00 b8 ea 45 36 c0 0f 46 c8 8b 54 24 30 89 c8 eb 06 <80> 38 00 74 07 40 4a 83 fa ff 75 f4 29 c8 89 c3 89 e8 f6 44 24 EIP: [<c01dc361>] vsnprintf+0x2af/0x48c SS:ESP 0068:dbe2bec4 What happens is that module_get_kallsym() drops module_mutex, returns "struct module *", module unloaded, "struct module *" used. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/