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Subject[2.2.14] Deadlock in ide-tape?
Hi,

I'm seeing a deadlock, apparently in ide-tape, on 2.2.12, 2.2.14 and
2.2.15pre7 (all the kernels I've tried). I used IKD to get a stack dump
(included below). Any ideas? Please let me know if you need any more info.

ksymoops 2.3.3 on i586 2.2.15pre7+ikd. Options used
-V (default)
-k /var/log/ksymoops/20000214110830.ksyms (specified)
-l /var/log/ksymoops/20000214110830.modules (specified)
-o /lib/modules/2.2.15pre7+ikd/ (default)
-m /boot/System.map-2.2.15pre7+ikd (default)
Unable to handle kernel NULL pointer dereference at virtual address 00000000
current->tss.cr3 = 027be000, %cr3 = 027be000
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c0113c40>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 027be000 ebx: c3685c2c ecx: c01f6000 edx: c3f55d60
esi: c3684000 edi: c3685bdc ebp: c3685bf8 esp: c3685bd8
ds: 0018 es: 0018 ss: 0018
Process mt (pid: 665, process nr: 42, stackpage=c3685000)
Stack: c3f6f0c0 c3684000 c3685c30 00000000 00000000 0004163d c3685c2c c0113b94
c3685c38 c018ef34 c3685c2c 0000000f 00000001 c0190f0d c3f6f0c0 00000000
c0211104 c3685cbc c3685c5c 00000246 c3f6f0c0 00002694 00000000 c3685bdc
Call Trace: [<c018ef34>] (0) [<c40647f7>] (64) [<c40658fd>] (88) [<c4065ae8>] (360) [<c0130ded>] (404) [<c010a04c>] (48)
Code: c7 05 00 00 00 00 00 00 00 00 c7 06 02 00 00 00 eb ca 89 f6
>>EIP; c0113c40 <__down+90/e0> <=====
Trace; c018ef34 <__down_failed+8/c>
Trace; c40647f7 <[ide-tape]idetape_queue_pc_tail+2b/38>
Trace; c40658fd <[ide-tape]idetape_mtioctop+1a5/23c>
Trace; c4065ae8 <[ide-tape]idetape_chrdev_ioctl+154/298>
Trace; c0130ded <sys_ioctl+18d/1a4>
Trace; c010a04c <system_call+34/38>
Code; c0113c40 <__down+90/e0>
00000000 <_EIP>:
Code; c0113c40 <__down+90/e0> <=====
0: c7 05 00 00 00 00 00 movl $0x0,0x0 <=====
Code; c0113c47 <__down+97/e0>
7: 00 00 00
Code; c0113c4a <__down+9a/e0>
a: c7 06 02 00 00 00 movl $0x2,(%esi)
Code; c0113c50 <__down+a0/e0>
10: eb ca jmp ffffffdc <_EIP+0xffffffdc> c0113c1c <__down+6c/e0>
Code; c0113c52 <__down+a2/e0>
12: 89 f6 mov %esi,%esi

--
Steve Dodd, Network Adminstrator, WotNot Ltd.

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