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SubjectBUG & OOPS REPORT: /proc/scsi/ entries not properly cleaned up
I'm using 2.4.0-test9-pre7 and have a _very_ reproducable OOPS with the
SCSI layer. Everything relevant is compiled as a module (except for the
/proc support).

The test scenario is this:
(1) Boot the machine
(2) modprobe ide-scsi (note this autoloads scsi_mod but nothing else)
(3) rmmod ide-scsi
(4) ls /proc/scsi
Then the OOPS happens.

If, instead of step (4), I instead re-modprobe ide-scsi again, then an 'ls
/proc/scsi/' will show (without an immediate OOPS):

[root@zen mdharm]# ls /proc/scsi/
ide-scsi/ ide-scsi/ scsi

No, the double ide-scsi entry isn't a typo -- this is what ls reports as
being there.

The OOPS case is decoded via ksymoops below. My intuition suggests that
this is related to the fact that /proc seems to always be busy (and
therefore not umountable) at shutdown.

I'm more than willing to test patches that might fix the problem.

Sep 29 15:05:01 zen kernel: Unable to handle kernel paging request at
virtual address d38c2010
Sep 29 15:05:01 zen kernel: c0145032
Sep 29 15:05:01 zen kernel: *pde = 01594063
Sep 29 15:05:01 zen kernel: Oops: 0002
Sep 29 15:05:01 zen kernel: CPU: 0
Sep 29 15:05:01 zen kernel: EIP: 0010:[proc_get_inode+150/264]
Sep 29 15:05:01 zen kernel: EFLAGS: 00010286
Sep 29 15:05:01 zen kernel: eax: d38c2000 ebx: cf687520 ecx: c1466fc0 edx: 00000023
Sep 29 15:05:01 zen kernel: esi: cd990340 edi: cf687574 ebp: ffffffea esp: cd99def0
Sep 29 15:05:01 zen kernel: ds: 0018 es: 0018 ss: 0018
Sep 29 15:05:01 zen kernel: Process ls (pid: 705, stackpage=cd99d000)
Sep 29 15:05:01 zen kernel: Stack: cda17ec0 cd9901c0 c0146a9c c144b800 00001190 cf687520 fffffff4 cda17ec0
Sep 29 15:05:01 zen kernel: cd9901c0 cd990214 c0137083 cd9901c0 cda17ec0 00000000 00000000 cd99df68
Sep 29 15:05:01 zen kernel: cf115013 c01377c4 cda17e40 cd99df68 00000000 cf115000 00000000 cd99dfa4
Sep 29 15:05:01 zen kernel: Call Trace: [proc_lookup+104/140] [real_lookup+79/184] [path_walk+1440/2028] [<f27a545f>] [__user_walk+58/84] [sys_newlstat+21/112] [system_call+51/64]
Sep 29 15:05:01 zen kernel: Code: ff 40 10 8b 43 24 80 48 14 18 66 8b 43 08 25 00 f0 ff ff 66
Using defaults from ksymoops -t elf32-i386 -a i386

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: ff 40 10 incl 0x10(%eax)
Code; 00000003 Before first symbol
3: 8b 43 24 movl 0x24(%ebx),%eax
Code; 00000006 Before first symbol
6: 80 48 14 18 orb $0x18,0x14(%eax)
Code; 0000000a Before first symbol
a: 66 8b 43 08 movw 0x8(%ebx),%ax
Code; 0000000e Before first symbol
e: 25 00 f0 ff ff andl $0xfffff000,%eax
Code; 00000013 Before first symbol
13: 66 00 00 addb %al,(%eax)

Matt Dharm

--
Matthew Dharm Home: mdharm-usb@one-eyed-alien.net
Maintainer, Linux USB Mass Storage Driver

NYET! The evil stops here!
-- Pitr
User Friendly, 6/22/1998
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