BUG & OOPS REPORT: /proc/scsi/ entries not properly cleaned up

From: Matthew Dharm (mdharm-scsi@one-eyed-alien.net)
Date: Fri Sep 29 2000 - 18:19:23 EDT

  • Next message: Stephen E. Clark: "Re: What is up with Redhat 7.0?"

    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
    - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/

    This archive was generated by hypermail 2b29 : Fri Sep 29 2000 - 18:22:14 EDT