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Subject[Bug 601] New: BUG when running ipcs after huge page shm
http://bugme.osdl.org/show_bug.cgi?id=601

Summary: BUG when running ipcs after huge page shm
Kernel Version: 2.5.67-bk current
Status: NEW
Severity: normal
Owner: akpm@digeo.com
Submitter: plars@austin.ibm.com


Distribution:
Hardware Environment: 2-way PIII-550, 2GB ram
Software Environment:
CONFIG_HUGETLB_PAGE=y

Problem Description:

kernel BUG at include/asm/spinlock.h:123!
invalid operand: 0000 [#1]
CPU: 0
EIP: 0060:[<c02055ad>] Not tainted
EFLAGS: 00010286
EIP is at shm_get_stat+0x5d/0xbc
eax: 0000000e ebx: f772e14c ecx: c04a1be0 edx: c0411d88
esi: f772e1b0 edi: 00000000 ebp: f747df38 esp: f747dde4
ds: 007b es: 007b ss: 0068
Process ipcs (pid: 778, threadinfo=f747c000 task=f762e100)
Stack: c03a9ab7 c0205595 f747df2c bffff620 f747df44 c050bfb0 c0205801 f747df34
f747df38 bffff5bc 0000000e 00000000 00000000 00000000 00000000 00000000
00000001 00000001 00000019 00000000 00000000 c0512bc0 f7c181cc f7c181bc
Call Trace:
[<c0205595>] shm_get_stat+0x45/0xbc
[<c0205801>] sys_shmctl+0x1f5/0x820
[<c013a1e0>] check_poison_obj+0x38/0x188
[<c013baa6>] kmem_cache_alloc+0x126/0x134
[<c01483b2>] page_add_rmap+0x12/0x158
[<c0143e26>] do_no_page+0x47a/0x488
[<c014401d>] handle_mm_fault+0x105/0x220
[<c01168b0>] do_page_fault+0x120/0x45d
[<c0116790>] do_page_fault+0x0/0x45d
[<c0215ef1>] tty_write+0x33d/0x378
[<c021b298>] write_chan+0x0/0x20c
[<c010f918>] sys_ipc+0x1d4/0x1ec
[<c0109a2d>] error_code+0x2d/0x38
[<c0108fa3>] syscall_call+0x7/0xb
Code: 0f 0b 7b 00 a0 9a 3a c0 83 c4 08 f0 fe 0b 0f 88 04 0d 00 00

Steps to reproduce:
echo 10 > /proc/sys/vm/nr_hugepages
ran a quick test program that used shm to allocate 8MB with SHM_HUGETLB
run the 'ipcs' command
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