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SubjectRe: more signal locking bugs?
> Ok, I committed this alternative change, which isn't quite as minimal, but 
> looks a lot cleaner to me.
>
> Also, looking at execve() and other paths, we do seem to have sufficient
> protection from the tasklist_lock that signal delivery should be fine. So
> despite a long and confused thread, I think in the end the only real bug
> was the one Martin found which should be thus fixed..

Ran your patch ... but I get plenty of these now:

Unable to handle kernel NULL pointer dereference at virtual address 00000004
printing eip:
c016d5a8
*pde = 2e10f001
*pte = 00000000
Oops: 0000
CPU: 2
EIP: 0060:[<c016d5a8>] Not tainted
EFLAGS: 00010202
EIP is at collect_sigign_sigcatch+0x1c/0x44
eax: ed6d72c0 ebx: ed403f50 ecx: 00000004 edx: 00000001
esi: ed403f48 edi: ed6d72c0 ebp: 00000000 esp: ed403eec
ds: 007b es: 007b ss: 0068
Process ps (pid: 19988, threadinfo=ed402000 task=ed9352a0)
Stack: c011d115 c02af820 c016dab8 ed6d72c0 ed403f48 ed403f50 ed6d72c0 edb99a50
ed6d72c0 eebf33c0 ee225000 c034e400 ed403f50 ed403f48 00000000 52000000
00008800 00000125 eebf33c0 eebf33e0 00000000 00000000 00000000 000000d0
Call Trace:
[<c011d115>] do_exit+0x30d/0x31c
[<c016dab8>] proc_pid_stat+0x110/0x324
[<c0130076>] __get_free_pages+0x4e/0x54
[<c016b497>] proc_info_read+0x53/0x130
[<c0145215>] vfs_read+0xa5/0x128
[<c01454a2>] sys_read+0x2a/0x3c
[<c0108b3f>] syscall_call+0x7/0xb
Code: 8b 01 83 f8 01 75 08 8d 42 ff 0f ab 06 eb 0a 85 c0 74 06 8d

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