OOPS: dcache_dir_lseek, 2.4.21 and 2.4.20

From: Matt Zimmerman (mdz@debian.org)
Date: Sat Jul 26 2003 - 10:21:35 EST


I see this from time to time when I leave a UML instance running for a long
period of time (I get this oops on the host, not the UML, of course). It is
not immediately reproducible, but has happened several times under similar
circumstances. Previously I had seen it on 2.4.20 as well.

-- 
 - mdz

Unable to handle kernel NULL pointer dereference at virtual address 00000000 c014c4d2 *pde = 00000000 Oops: 0002 CPU: 0 EIP: 0010:[<c014c4d2>] Not tainted Using defaults from ksymoops -t elf32-i386 -a i386 EFLAGS: 00010282 eax: 00000000 ebx: c22762e0 ecx: cbb159e8 edx: c22762e0 esi: 00000002 edi: 00000000 ebp: c22762c0 esp: c663df84 ds: 0018 es: 0018 ss: 0018 Process linux (pid: 936, stackpage=c663d000) Stack: fffffff2 c22762c0 00000000 c014c3c0 c63e97c0 ffffffea c013d7b5 c63e97c0 00000002 00000000 00000000 c663c000 00000002 a691bafc a691ba8c c0108eff 00000037 00000002 00000000 00000002 a691bafc a691ba8c 00000013 0000002b Call Trace: [<c014c3c0>] [<c013d7b5>] [<c0108eff>] Code: 89 10 89 42 04 8b 54 24 1c 8b 42 08 8b 40 08 8d 48 68 ff 40

>>EIP; c014c4d2 <dcache_dir_lseek+112/140> <=====

>>ebx; c22762e0 <_end+1f61168/20504f08> >>ecx; cbb159e8 <_end+b800870/20504f08> >>edx; c22762e0 <_end+1f61168/20504f08> >>ebp; c22762c0 <_end+1f61148/20504f08> >>esp; c663df84 <_end+6328e0c/20504f08>

Trace; c014c3c0 <dcache_dir_lseek+0/140> Trace; c013d7b5 <sys_lseek+65/a0> Trace; c0108eff <system_call+33/38>

Code; c014c4d2 <dcache_dir_lseek+112/140> 00000000 <_EIP>: Code; c014c4d2 <dcache_dir_lseek+112/140> <===== 0: 89 10 mov %edx,(%eax) <===== Code; c014c4d4 <dcache_dir_lseek+114/140> 2: 89 42 04 mov %eax,0x4(%edx) Code; c014c4d7 <dcache_dir_lseek+117/140> 5: 8b 54 24 1c mov 0x1c(%esp,1),%edx Code; c014c4db <dcache_dir_lseek+11b/140> 9: 8b 42 08 mov 0x8(%edx),%eax Code; c014c4de <dcache_dir_lseek+11e/140> c: 8b 40 08 mov 0x8(%eax),%eax Code; c014c4e1 <dcache_dir_lseek+121/140> f: 8d 48 68 lea 0x68(%eax),%ecx Code; c014c4e4 <dcache_dir_lseek+124/140> 12: ff 40 00 incl 0x0(%eax)

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