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Subjectpipe_read oops
From
Anyone else seen this? I haven't had time to investigate it - from a
pre 2.6.29-rc1 kernel (on my topic branch - but can see no signs of my
code being involved).

Unfortunately I was testing this to see if my code worked with out
memory allocation debugging on, so quite a lot of debugging stuff
switched off.

Will investigate further, later.


[ 43.495753] Unable to handle kernel NULL pointer dereference at
virtual address 0000000c
[ 43.509964] pc = 8c08938a
[ 43.512441] *pde = 00000000
[ 43.517075] Oops: 0000 [#1]
[ 43.519187] Modules linked in:
[ 43.522239]
[ 43.523861] Pid : 816, Comm: rc
[ 43.527281] CPU : 0 Not tainted
(2.6.28-06145-g8874d26 #211)
[ 43.527308]
[ 43.535560] PC is at pipe_read+0xca/0x3e0
[ 43.539685] PR is at pipe_read+0x54/0x3e0
[ 43.543805] PC : 8c08938a SP : 8c849e60 SR : 40008000 TEA : 004c8028
[ 43.550632] R0 : 55555555 R1 : 00000000 R2 : 00000000 R3 : 8cf3222c
[ 43.557460] R4 : 8cf32200 R5 : 8cf3222c R6 : 00000001 R7 : 55555555
[ 43.564287] R8 : 8c5286c0 R9 : 8c849ebc R10 : 8c849efc R11 : fffffdee
[ 43.571111] R12 : 8cf3222c R13 : 8c080000 R14 : 8cf32200
[ 43.576503] MACH: 00000000 MACL: fffffff8 GBR : 296e4440 PR : 8c089314
[ 43.583319]
[ 43.583332] Call trace:
[ 43.587479] [<8c05eb52>] do_wp_page+0x4d2/0x800
[ 43.592155] [<8c08035c>] do_sync_read+0x9c/0x100
[ 43.596823] [<8c080000>] wait_on_retry_sync_kiocb+0x0/0xc0
[ 43.602587] [<8c031800>] autoremove_wake_function+0x0/0x40
[ 43.608141] [<8c2499e8>] preempt_schedule+0x28/0x60
[ 43.613164] [<8c249360>] __sched_text_start+0x0/0x560
[ 43.618380] [<8c080c1e>] vfs_read+0x7e/0x160
[ 43.622862] [<8c08119a>] sys_read+0x3a/0x80
[ 43.627182] [<8c008236>] syscall_call+0xc/0x10
[ 43.631663] [<8c081160>] sys_read+0x0/0x80
[ 43.635965]
[ 43.637401] Process: rc (pid: 816, stack limit = 8c848001)
[ 43.643148] Stack: (0x8c849e60 to 0x8c84a000)
[ 43.647632] 9e60: 8cf3222c 8c52872c 8c849f40 55555555 8c8f0480
00000000 00000000 00000080
[ 43.656075] 9e80: 55555555 00000000 8c05eb52 8c87d0a8 8c08035c
8c849f40 8c080000 8c8f0480
[ 43.664698] 9ea0: fffffdee 8c849efc 8c849ebc 00000000 00000000
00000000 8c849f7c 8c84a004
[ 43.673142] 9ec0: 8c8af3c0 00000000 00000001 ffffffff 8c8f0480
00000000 00000000 00000000
[ 43.681764] 9ee0: 00000000 8cc1a080 00000000 00000000 8c8af380
8cc1a080 8c031800 8c849efc
[ 43.690208] 9f00: 8c849efc 00000000 00000000 8cc1a250 8cc1a24c
8cc1a1d4 8cc1a0fc 00000080
[ 43.698830] 9f20: 8c2499e8 8c849f40 00000638 00000000 00000000
00000000 8c249360 10000000
[ 43.707274] 9f40: 7ba70cb4 00000080 8c080c1e 7ba70c84 00000638
fffffff7 8c849f7c 7ba70cb4
[ 43.715897] 9f60: 00000080 8c8f0480 8c08119a 00000080 7ba70cb4
8c8f0480 8c849f48 00000000
[ 43.724340] 9f80: 00000000 00000000 8c008236 00000000 00000000
00000071 0000007f 8c081160
[ 43.732963] 9fa0: 00000000 00000440 7ba70d3c 00000003 00000003
7ba70cb4 00000080 00000118
[ 43.741406] 9fc0: 00000000 00000080 7ba70cb4 00000003 00000000
00000638 7ba70c84 7ba70c84
[ 43.750029] 9fe0: 29675174 00457bf2 00008001 296e4440 00000000
000003c0 0000004c 00000160
[ 43.766583] ---[ end trace 42b96aa1b3d1820b ]---


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