Hit a BUG() via lvm:
Scanning logical volumes
Reading all physical volumes. This may take a while...
Found volume group "VolGroup00" using metadata type lvm2
Activating logical volumes
[ 75.215078] ------------[ cut here ]------------
[ 75.230165] kernel BUG at mm/swap.c:442!
[ 75.244589] invalid opcode: 0000 [#1]
[ 75.258693] PREEMPT SMP
[ 75.271894] last sysfs file: /block/ram0/dev
[ 75.286734] Modules linked in:
[ 75.300193] CPU: 0
[ 75.300195] EIP: 0060:[<c0150303>] Not tainted VLI
[ 75.300197] EFLAGS: 00210006 (2.6.20-mm1 #1)
[ 75.341750] EIP is at __pagevec_lru_add_active+0x76/0xcc
[ 75.356722] eax: 80100060 ebx: c1bf9c48 ecx: c1e345bc edx: 00000001
[ 75.373139] esi: c03dc680 edi: c1c4e780 ebp: f7ce3f34 esp: f7ce3f24
[ 75.389642] ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
[ 75.405199] Process lvm (pid: 415, ti=f7ce2000 task=c1e34070 task.ti=f7ce2000)
[ 75.421908] Stack: 00000000 00000000 c1e25548 f7d58ea0 f7ce3f40 c01504fc c1e25548 f7ce3f70
[ 75.451375] c0157b22 c0579820 f7ce5478 00000000 f7d58420 f7d58f00 00000000 00000000
[ 75.481458] c1e25548 f7d58420 f7d58420 f7ce3fa0 c0158539 b7fa1000 b7fa2000 b7fa1000
[ 75.512233] Call Trace:
[ 75.536111] [<c01039ca>] show_trace_log_lvl+0x1a/0x2f
[ 75.552228] [<c0103a7a>] show_stack_log_lvl+0x9b/0xaa
[ 75.568329] [<c0103c6f>] show_registers+0x1e6/0x325
[ 75.584336] [<c0103ed4>] die+0x126/0x225
[ 75.599300] [<c010404c>] do_trap+0x79/0x91
[ 75.614358] [<c0104951>] do_invalid_op+0x97/0xa1
[ 75.629892] [<c02f8a4c>] error_code+0x7c/0x84
[ 75.645097] [<c01504fc>] lru_add_drain+0x41/0x8d
[ 75.660599] [<c0157b22>] unmap_region+0x2a/0x129
[ 75.676116] [<c0158539>] do_munmap+0x153/0x1b4
[ 75.691497] [<c01585bf>] sys_munmap+0x25/0x34
[ 75.706737] [<c01029c0>] syscall_call+0x7/0xb
[ 75.721913] =======================
[ 75.736054] Code: 54 80 1a 00 8b 03 a8 20 74 04 0f 0b eb fe f0 0f ba 2b 05 8b 03 a8 40 74 04 0f 0b eb fe f0 0f ba 2b 06 8b 03 a9 00 00 10 00 74 04 <0f> 0b eb fe 8d 96 a0 05 00 00 8d 43 30 e8 24 eb 08 00 ba 02 00
[ 75.799343] EIP: [<c0150303>] __pagevec_lru_add_active+0x76/0xcc SS:ESP 0068:f7ce3f24
[ 75.831928] note: lvm[415] exited with preempt_count 2
[ 75.849402] BUG: sleeping function called from invalid context at kernel/rwsem.c:20
[ 75.881617] in_atomic():1, irqs_disabled():1
[ 75.898063] 2 locks held by lvm/415:
[ 75.913388] #0: (&mm->mmap_sem){----}, at: [<c01585b2>] sys_munmap+0x18/0x34
[ 75.944378] #1: (&zone->lru_lock){....}, at: [<c01502dc>] __pagevec_lru_add_active+0x4f/0xcc
[ 75.976490] irq event stamp: 69326
[ 75.990962] hardirqs last enabled at (69325): [<c0102b09>] syscall_exit_work+0x11/0x30
[ 76.022168] hardirqs last disabled at (69326): [<c02f8348>] _spin_lock_irq+0x18/0x51
[ 76.054169] softirqs last enabled at (57904): [<c011ff6f>] __do_softirq+0xfa/0x100
[ 76.087195] softirqs last disabled at (57889): [<c011ffbf>] do_softirq+0x4a/0x7a
[ 76.121170] [<c01039ca>] show_trace_log_lvl+0x1a/0x2f
[ 76.139835] [<c01040a5>] show_trace+0x12/0x14
[ 76.157721] [<c0104157>] dump_stack+0x16/0x18
[ 76.175743] [<c01155f7>] __might_sleep+0xe5/0xeb
[ 76.194139] [<c012e9e6>] down_read+0x18/0x4c
[ 76.212190] [<c011d1e0>] exit_mm+0x27/0xd1
[ 76.230203] [<c011e4a8>] do_exit+0x1e1/0x6f6
[ 76.247845] [<c0103fad>] die+0x1ff/0x225
[ 76.264934] [<c010404c>] do_trap+0x79/0x91
[ 76.281212] [<c0104951>] do_invalid_op+0x97/0xa1
[ 76.297820] [<c02f8a4c>] error_code+0x7c/0x84
[ 76.313929] [<c01504fc>] lru_add_drain+0x41/0x8d
[ 76.330202] [<c0157b22>] unmap_region+0x2a/0x129
[ 76.346230] [<c0158539>] do_munmap+0x153/0x1b4
[ 76.361722] [<c01585bf>] sys_munmap+0x25/0x34
[ 76.377115] [<c01029c0>] syscall_call+0x7/0xb
[ 76.392529] =======================
[ 76.406713] BUG: scheduling while atomic: lvm/0x00000002/415
[ 76.422805] 2 locks held by lvm/415:
[ 76.436571] #0: (&mm->mmap_sem){----}, at: [<c01585b2>] sys_munmap+0x18/0x34
[ 76.465007] #1: (&zone->lru_lock){....}, at: [<c01502dc>] __pagevec_lru_add_active+0x4f/0xcc
[ 76.494996] [<c01039ca>] show_trace_log_lvl+0x1a/0x2f
[ 76.510283] [<c01040a5>] show_trace+0x12/0x14
[ 76.524538] [<c0104157>] dump_stack+0x16/0x18
[ 76.538603] [<c02f5346>] __sched_text_start+0x76/0x98c
[ 76.553174] [<c01d029f>] rwsem_down_failed_common+0x16e/0x18d
[ 76.568176] [<c02f7cef>] rwsem_down_read_failed+0x1d/0x26
[ 76.582508] [<c02f7d73>] call_rwsem_down_read_failed+0x7/0xc
[ 76.597197] [<c011d1e0>] exit_mm+0x27/0xd1
[ 76.610369] [<c011e4a8>] do_exit+0x1e1/0x6f6
[ 76.623618] [<c0103fad>] die+0x1ff/0x225
[ 76.636419] [<c010404c>] do_trap+0x79/0x91
[ 76.649413] [<c0104951>] do_invalid_op+0x97/0xa1
[ 76.662859] [<c02f8a4c>] error_code+0x7c/0x84
[ 76.676016] [<c01504fc>] lru_add_drain+0x41/0x8d
[ 76.689487] [<c0157b22>] unmap_region+0x2a/0x129
[ 76.702979] [<c0158539>] do_munmap+0x153/0x1b4
[ 76.716310] [<c01585bf>] sys_munmap+0x25/0x34
[ 76.729566] [<c01029c0>] syscall_call+0x7/0xb
[ 76.742688] =======================
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