Re: [2.3.24, smbfs] Kernel panic: put_cached_page: page count=1

Alexander Viro (viro@math.psu.edu)
Thu, 28 Oct 1999 11:25:38 -0400 (EDT)

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On Thu, 28 Oct 1999 craig@qualica.com wrote:

> Now I get (no reboot, just a make modules && make modules_install which
> should be ok I think. smbfs module was not loaded at the time but was
> auto-loaded when I did the smbmount which seemed fine)

[snip]
> Oct 28 15:12:01 flat kernel: kernel BUG at filemap.c:65!
> Oct 28 15:12:01 flat kernel: invalid operand: 0000
> Oct 28 15:12:01 flat kernel: CPU: 0
> Oct 28 15:12:01 flat kernel: EIP: 0010:[__add_page_to_hash_queue+60/68]
> Oct 28 15:12:01 flat kernel: EFLAGS: 00010286
> Oct 28 15:12:01 flat kernel: eax: 0000001c ebx: c5777f04 ecx: 00000027 edx: 00000014
> Oct 28 15:12:01 flat kernel: esi: c5777e80 edi: 00000000 ebp: c11e84f4 esp: c3a21ee4
> Oct 28 15:12:01 flat kernel: ds: 0018 es: 0018 ss: 0018
> Oct 28 15:12:01 flat kernel: Process ls (pid: 2227, stackpage=c3a21000)
> Oct 28 15:12:01 flat kernel: Stack: 00000041 c5777f04 c011f529 c5777e80 c11e84f4 c5777e80 c11e84f4 c5777e80
> Oct 28 15:12:01 flat kernel: 00000000 c68544fa c5777e80 c5777f04 00000000 c11e84f4 c5777e80 c301ac60
> Oct 28 15:12:01 flat kernel: c0d27840 c5777f04 00008000 18aeefe0 c685457b c5777f04 00000000 00000001
> Oct 28 15:12:01 flat kernel: Call Trace: [add_to_page_cache_unique+177/288] [<c68544fa>] [<c685457b>] [<c6853e1f>] [do_page_fault+352/1192] [sys_getdents+221/360] [filldir+0/128]
> Oct 28 15:12:01 flat kernel: [system_call+52/56]
> Oct 28 15:12:01 flat kernel: Code: 0f 0b 83 c4 0c 5b c3 90 8b 4c 24 04 8b 51 34 85 d2 74 19 8b

Interesting... Could you try the attached patch (braino with missed
initialization fixed + debugging stuff added) and see what will it give?
I don't see how could that path give buffers on the new page, but IIRC
there was something similar in 2.3.22 (not in smbfs). At least that might
somewhat narrow the things down.

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