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Old 04-05-2012, 02:39 AM   #1
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Registered: Apr 2012
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soft lockup for siglock in linux kernel

(Sorry the kernel is
Running linux on an x86 mutiprocessor multicore hardware. The following prints are continuously coming on the console. Anyone seen this earlier (this is case of a process attempting to take a siglock of another process and somehow that siglock is either not valid or lost)

BUG: soft lockup - CPU#0 stuck for 11s! [pidof:17798]
CPU 0:
Modules linked in: bpctl_mod jnet_igb jnet e1000
Pid: 17798, comm: pidof Tainted: G D #1
RIP: 0010:[<ffffffff80467c92>] [<ffffffff80467c92>] _spin_lock_irqsave+0x12/0x30
RSP: 0018:ffff810100905b90 EFLAGS: 00000286
RAX: 0000000000000282 RBX: ffff81042d0e1f88 RCX: ffff810100905e67
RDX: 0000000000000000 RSI: ffff810100905e70 RDI: ffff81042d0e1f88
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000074 R12: 000000000000001a
R13: ffff810100905b08 R14: ffff810100905d00 R15: 0000003000000030
FS: 00002b01fd4686e0(0000) GS:ffffffff8056f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 000000000065e4a8 CR3: 00000002eb542000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400

Call Trace:
[<ffffffff8024731a>] lock_task_sighand+0x3a/0x80
[<ffffffff802e13ce>] do_task_stat+0xee/0xb60
[<ffffffff802ddc9f>] pid_revalidate+0x3f/0x110
[<ffffffff802a77bf>] do_lookup+0x8f/0x210
[<ffffffff802b2b36>] dput+0xa6/0x140
[<ffffffff802a9d98>] __link_path_walk+0xc28/0xdf0
[<ffffffff802dce23>] task_dumpable+0x23/0x40
[<ffffffff802b7057>] mntput_no_expire+0x27/0xb0
[<ffffffff802a9fe1>] link_path_walk+0x81/0x100
[<ffffffff802a2bbb>] sys_readlinkat+0x8b/0xc0
[<ffffffff8028c455>] vma_adjust+0x145/0x4c0
[<ffffffff8027e6f1>] __alloc_pages+0x61/0x3c0
[<ffffffff802def4a>] proc_info_read+0xba/0x100
[<ffffffff8029fe55>] vfs_read+0xc5/0x160
[<ffffffff802a0333>] sys_read+0x53/0x90
[<ffffffff8020c35e>] system_call+0x7e/0x83

Last edited by mohitjoshi; 04-05-2012 at 03:33 AM. Reason: Adding info
Old 04-14-2012, 04:51 AM   #2
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