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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U5
Ingo Molnar wrote:
> there are two big changes:
>
> - debug feature: automatic semaphore/rwsem deadlock detection, based on
> the code from Igor Manyilov and Bill Huey.
>
> this is a very nice feature that should help in debugging the remaining
> deadlocks. The deadlock detection feature has already helped me fix a
> bug that was causing hangs in the VFS, so it's really useful.

I can trigger the deadlock detection when I try to ping my default
gateway. I'm attaching the log from dmesg.

Michal
BUG: semaphore deadlock detected!
.. task ksoftirqd/0/2 is holding c04019c4.
0000012c 00000001 c14f4000 00000000 c14f5f9c c011e713 c03a36b8 c011e7d9
c011eb18 0000000a c03a36b8 c14f4000 c14f4000 00000000 c14f5fa4 c011e7f1
c14f5fbc c011eb18 00000001 fffffff6 c14f4000 c14e3f70 c14f5fec c012d333
Call Trace:
[<c011e713>] ___do_softirq+0x83/0xc8
[<c011e7d9>] _do_softirq+0x8/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c011e7f1>] _do_softirq+0x20/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c012d333>] kthread+0xaa/0xaf
[<c011ea85>] ksoftirqd+0x0/0xd1
[<c012d289>] kthread+0x0/0xaf
[<c01032f1>] kernel_thread_helper+0x5/0xb
preempt count: 00000003
. 3-level deep critical section nesting:
.. entry 1: down_write+0x95/0x97 / (dev_queue_xmit_nit+0x41/0x127)
.. entry 2: __down_write+0x43/0x190 / (down_write+0x52/0x97)
.. entry 3: print_traces+0x1d/0x56 / (show_stack+0x85/0x9b)

...#0 task ksoftirqd/0/2 is holding c04019c4.
------------[ cut here ]------------
kernel BUG at lib/rwsem-generic.c:416!
invalid operand: 0000 [#1]
PREEMPT
Modules linked in: ipt_REJECT ipt_pkttype ipt_LOG ipt_state ipt_multiport ipt_conntrack iptable_mangle ip_nat_irc ip_nat_tftp ip_nat_ftp iptable_nat ip_conntrack_irc ip_conntrack_tftp ip_conntrack_ftp ip_conntrack iptable_filter ip_tables af_packet 8139too 8139cp mii crc32 e1000 snd_intel8x0 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd soundcore snd_page_alloc ehci_hcd usbhid uhci_hcd usbcore intel_mch_agp intel_agp evdev nls_iso8859_1 nls_cp437 vfat fat dm_mod floppy ide_cd cdrom psmouse unix
CPU: 0
EIP: 0060:[<c0289aca>] Not tainted VLI
EFLAGS: 00010002 (2.6.9-rc4-mm1-RT-U5)
EIP is at __down_write+0xad/0x190
eax: 00000001 ebx: c14e0d20 ecx: 00000000 edx: c14f4000
esi: c04019c4 edi: dff1b080 ebp: c14f5d64 esp: c14f5d48
ds: 007b es: 007b ss: 0068 preempt: 00000003
Process ksoftirqd/0 (pid: 2, threadinfo=c14f4000 task=c14e0d20)
Stack: c04019c4 c04019c8 c04019c8 c14e0d20 00000002 c14f4000 c04019c4 c14f5d7c
c01b33c8 c04019c4 c14e0d20 dec0f000 df59a000 c14f5da0 c02364c5 c04019c0
00000202 c14f5da0 df59a000 dec0f000 df59a000 df59a358 c14f5dc4 c02420cd
Call Trace:
[<c01b33c8>] down_write+0x52/0x97
[<c02364c5>] dev_queue_xmit_nit+0x41/0x127
[<c02420cd>] qdisc_restart+0x182/0x1ac
[<c0236964>] dev_queue_xmit+0x194/0x230
[<c023c3e3>] neigh_resolve_output+0xf1/0x1e5
[<c023bf8d>] neigh_update+0x2c3/0x368
[<c0272642>] arp_process+0x1f8/0x5ac
[<c01132d0>] mcount+0x14/0x18
[<c0272a0a>] arp_rcv+0x14/0x155
[<c0236e14>] netif_receive_skb+0x10f/0x1ab
[<c0241c7e>] eth_type_trans+0xe/0xc8
[<e097582f>] rtl8139_rx+0x185/0x326 [8139too]
[<e0975bbb>] rtl8139_poll+0x5d/0xfe [8139too]
[<c023707b>] net_rx_action+0x7c/0x143
[<c011e713>] ___do_softirq+0x83/0xc8
[<c011e7d9>] _do_softirq+0x8/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c011e7f1>] _do_softirq+0x20/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c012d333>] kthread+0xaa/0xaf
[<c011ea85>] ksoftirqd+0x0/0xd1
[<c012d289>] kthread+0x0/0xaf
[<c01032f1>] kernel_thread_helper+0x5/0xb
preempt count: 00000004
. 4-level deep critical section nesting:
.. entry 1: down_write+0x95/0x97 / (dev_queue_xmit_nit+0x41/0x127)
.. entry 2: __down_write+0x43/0x190 / (down_write+0x52/0x97)
.. entry 3: die+0x3f/0x196 / (do_invalid_op+0x106/0x108)
.. entry 4: print_traces+0x1d/0x56 / (show_stack+0x85/0x9b)

Code: 10 89 45 ec 89 34 24 e8 47 90 f2 ff 89 34 24 e8 04 91 f2 ff 85 c0 74 1b a1 58 36 2d c0 85 c0 74 12 c7 05 58 36 2d c0 00 00 00 00 <0f> 0b a0 01 2f 32 2a c0 89 b3 70 06 00 00 9c 58 c1 e8 09 83 f0
<3>BUG: sleeping function called from invalid context ksoftirqd/0(2) at lib/rwsem-generic.c:593
in_atomic():1 [00000002], irqs_disabled():0
[<c0116e6c>] __might_sleep+0xc4/0xd6
[<c01b3275>] down_read+0x27/0x96
[<c011a353>] profile_task_exit+0x1b/0x43
[<c01132d0>] mcount+0x14/0x18
[<c011bfbf>] do_exit+0x1f/0x4a3
[<c0105e9a>] do_invalid_op+0x0/0x108
[<c0105af8>] do_divide_error+0x0/0x132
[<c0114a1c>] fixup_exception+0x1c/0x38
[<c0105fa0>] do_invalid_op+0x106/0x108
[<c01132d0>] mcount+0x14/0x18
[<c0289aca>] __down_write+0xad/0x190
[<c0119e3b>] release_console_sem+0xa7/0xfe
[<c0119ce2>] vprintk+0x116/0x179
[<c0105309>] error_code+0x2d/0x38
[<c0289aca>] __down_write+0xad/0x190
[<c01b33c8>] down_write+0x52/0x97
[<c02364c5>] dev_queue_xmit_nit+0x41/0x127
[<c02420cd>] qdisc_restart+0x182/0x1ac
[<c0236964>] dev_queue_xmit+0x194/0x230
[<c023c3e3>] neigh_resolve_output+0xf1/0x1e5
[<c023bf8d>] neigh_update+0x2c3/0x368
[<c0272642>] arp_process+0x1f8/0x5ac
[<c01132d0>] mcount+0x14/0x18
[<c0272a0a>] arp_rcv+0x14/0x155
[<c0236e14>] netif_receive_skb+0x10f/0x1ab
[<c0241c7e>] eth_type_trans+0xe/0xc8
[<e097582f>] rtl8139_rx+0x185/0x326 [8139too]
[<e0975bbb>] rtl8139_poll+0x5d/0xfe [8139too]
[<c023707b>] net_rx_action+0x7c/0x143
[<c011e713>] ___do_softirq+0x83/0xc8
[<c011e7d9>] _do_softirq+0x8/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c011e7f1>] _do_softirq+0x20/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c012d333>] kthread+0xaa/0xaf
[<c011ea85>] ksoftirqd+0x0/0xd1
[<c012d289>] kthread+0x0/0xaf
[<c01032f1>] kernel_thread_helper+0x5/0xb
preempt count: 00000003
. 3-level deep critical section nesting:
.. entry 1: down_write+0x95/0x97 / (dev_queue_xmit_nit+0x41/0x127)
.. entry 2: __down_write+0x43/0x190 / (down_write+0x52/0x97)
.. entry 3: print_traces+0x1d/0x56 / (dump_stack+0x23/0x27)

BUG: scheduling while atomic: ksoftirqd/0/0x04000002/2
caller is cond_resched+0x62/0x82
[<c0288df2>] __sched_text_start+0x53e/0x571
[<c02894c4>] cond_resched+0x62/0x82
[<c01132d0>] mcount+0x14/0x18
[<c02894c4>] cond_resched+0x62/0x82
[<c01b327a>] down_read+0x2c/0x96
[<c011a353>] profile_task_exit+0x1b/0x43
[<c01132d0>] mcount+0x14/0x18
[<c011bfbf>] do_exit+0x1f/0x4a3
[<c0105e9a>] do_invalid_op+0x0/0x108
[<c0105af8>] do_divide_error+0x0/0x132
[<c0114a1c>] fixup_exception+0x1c/0x38
[<c0105fa0>] do_invalid_op+0x106/0x108
[<c01132d0>] mcount+0x14/0x18
[<c0289aca>] __down_write+0xad/0x190
(ksoftirqd/0/2/CPU#0): new 856 us maximum-latency critical section.
=> started at timestamp 144481672: <__call_console_drivers+0x19/0x65>
=> ended at timestamp 144482528: <call_console_drivers+0x9e/0x13f>
[<c012ec10>] touch_preempt_timing+0x3d/0x41
[<c012eb37>] check_preempt_timing+0x1b2/0x24e
[<c0119a54>] call_console_drivers+0x9e/0x13f
[<c012ec10>] touch_preempt_timing+0x3d/0x41
[<c0119a54>] call_console_drivers+0x9e/0x13f
[<c0119a54>] call_console_drivers+0x9e/0x13f
[<c0288edb>] preempt_schedule+0x11/0x7a
[<c0119e04>] release_console_sem+0x70/0xfe
[<c0119ce2>] vprintk+0x116/0x179
[<c0289aca>] __down_write+0xad/0x190
[<c0119bc8>] printk+0x1d/0x21
[<c01055f8>] show_trace+0x78/0xb2
[<c0289aca>] __down_write+0xad/0x190
[<c01056f0>] dump_stack+0x23/0x27
[<c0288df2>] __sched_text_start+0x53e/0x571
[<c02894c4>] cond_resched+0x62/0x82
[<c01132d0>] mcount+0x14/0x18
[<c02894c4>] cond_resched+0x62/0x82
[<c01b327a>] down_read+0x2c/0x96
[<c011a353>] profile_task_exit+0x1b/0x43
[<c01132d0>] mcount+0x14/0x18
[<c011bfbf>] do_exit+0x1f/0x4a3
[<c0105e9a>] do_invalid_op+0x0/0x108
[<c0105af8>] do_divide_error+0x0/0x132
[<c0114a1c>] fixup_exception+0x1c/0x38
[<c0105fa0>] do_invalid_op+0x106/0x108
[<c01132d0>] mcount+0x14/0x18
[<c0289aca>] __down_write+0xad/0x190
[<c0119e3b>] release_console_sem+0xa7/0xfe
[<c0119ce2>] vprintk+0x116/0x179
[<c0105309>] error_code+0x2d/0x38
[<c0289aca>] __down_write+0xad/0x190
[<c01b33c8>] down_write+0x52/0x97
[<c02364c5>] dev_queue_xmit_nit+0x41/0x127
[<c02420cd>] qdisc_restart+0x182/0x1ac
[<c0236964>] dev_queue_xmit+0x194/0x230
[<c023c3e3>] neigh_resolve_output+0xf1/0x1e5
[<c023bf8d>] neigh_update+0x2c3/0x368
[<c0272642>] arp_process+0x1f8/0x5ac
[<c01132d0>] mcount+0x14/0x18
[<c0272a0a>] arp_rcv+0x14/0x155
[<c0236e14>] netif_receive_skb+0x10f/0x1ab
[<c0241c7e>] eth_type_trans+0xe/0xc8
[<e097582f>] rtl8139_rx+0x185/0x326 [8139too]
[<e0975bbb>] rtl8139_poll+0x5d/0xfe [8139too]
[<c023707b>] net_rx_action+0x7c/0x143
[<c011e713>] ___do_softirq+0x83/0xc8
[<c011e7d9>] _do_softirq+0x8/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c011e7f1>] _do_softirq+0x20/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c012d333>] kthread+0xaa/0xaf
[<c011ea85>] ksoftirqd+0x0/0xd1
[<c012d289>] kthread+0x0/0xaf
[<c01032f1>] kernel_thread_helper+0x5/0xb
preempt count: 04000003
. 3-level deep critical section nesting:
.. entry 1: down_write+0x95/0x97 / (dev_queue_xmit_nit+0x41/0x127)
.. entry 2: __down_write+0x43/0x190 / (down_write+0x52/0x97)
.. entry 3: print_traces+0x1d/0x56 / (dump_stack+0x23/0x27)

=> dump-end timestamp 144483248

[<c0119e3b>] release_console_sem+0xa7/0xfe
[<c0119ce2>] vprintk+0x116/0x179
[<c0105309>] error_code+0x2d/0x38
[<c0289aca>] __down_write+0xad/0x190
[<c01b33c8>] down_write+0x52/0x97
[<c02364c5>] dev_queue_xmit_nit+0x41/0x127
[<c02420cd>] qdisc_restart+0x182/0x1ac
[<c0236964>] dev_queue_xmit+0x194/0x230
[<c023c3e3>] neigh_resolve_output+0xf1/0x1e5
[<c023bf8d>] neigh_update+0x2c3/0x368
[<c0272642>] arp_process+0x1f8/0x5ac
[<c01132d0>] mcount+0x14/0x18
[<c0272a0a>] arp_rcv+0x14/0x155
[<c0236e14>] netif_receive_skb+0x10f/0x1ab
[<c0241c7e>] eth_type_trans+0xe/0xc8
[<e097582f>] rtl8139_rx+0x185/0x326 [8139too]
[<e0975bbb>] rtl8139_poll+0x5d/0xfe [8139too]
[<c023707b>] net_rx_action+0x7c/0x143
[<c011e713>] ___do_softirq+0x83/0xc8
[<c011e7d9>] _do_softirq+0x8/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c011e7f1>] _do_softirq+0x20/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c012d333>] kthread+0xaa/0xaf
[<c011ea85>] ksoftirqd+0x0/0xd1
[<c012d289>] kthread+0x0/0xaf
[<c01032f1>] kernel_thread_helper+0x5/0xb
preempt count: 04000003
. 3-level deep critical section nesting:
.. entry 1: down_write+0x95/0x97 / (dev_queue_xmit_nit+0x41/0x127)
.. entry 2: __down_write+0x43/0x190 / (down_write+0x52/0x97)
.. entry 3: print_traces+0x1d/0x56 / (dump_stack+0x23/0x27)

note: ksoftirqd/0[2] exited with preempt_count 2
BUG: scheduling while atomic: ksoftirqd/0/0x00000002/2
caller is do_exit+0x2a7/0x4a3
[<c0288df2>] __sched_text_start+0x53e/0x571
[<c011c247>] do_exit+0x2a7/0x4a3
[<c01132d0>] mcount+0x14/0x18
[<c011c247>] do_exit+0x2a7/0x4a3
[<c0105e9a>] do_invalid_op+0x0/0x108
[<c0105af8>] do_divide_error+0x0/0x132
[<c0114a1c>] fixup_exception+0x1c/0x38
[<c0105fa0>] do_invalid_op+0x106/0x108
[<c01132d0>] mcount+0x14/0x18
[<c0289aca>] __down_write+0xad/0x190
[<c0119e3b>] release_console_sem+0xa7/0xfe
[<c0119ce2>] vprintk+0x116/0x179
[<c0105309>] error_code+0x2d/0x38
[<c0289aca>] __down_write+0xad/0x190
[<c01b33c8>] down_write+0x52/0x97
[<c02364c5>] dev_queue_xmit_nit+0x41/0x127
[<c02420cd>] qdisc_restart+0x182/0x1ac
[<c0236964>] dev_queue_xmit+0x194/0x230
[<c023c3e3>] neigh_resolve_output+0xf1/0x1e5
[<c023bf8d>] neigh_update+0x2c3/0x368
[<c0272642>] arp_process+0x1f8/0x5ac
[<c01132d0>] mcount+0x14/0x18
[<c0272a0a>] arp_rcv+0x14/0x155
[<c0236e14>] netif_receive_skb+0x10f/0x1ab
[<c0241c7e>] eth_type_trans+0xe/0xc8
[<e097582f>] rtl8139_rx+0x185/0x326 [8139too]
[<e0975bbb>] rtl8139_poll+0x5d/0xfe [8139too]
[<c023707b>] net_rx_action+0x7c/0x143
[<c011e713>] ___do_softirq+0x83/0xc8
[<c011e7d9>] _do_softirq+0x8/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c011e7f1>] _do_softirq+0x20/0x22
[<c011eb18>] ksoftirqd+0x93/0xd1
[<c012d333>] kthread+0xaa/0xaf
[<c011ea85>] ksoftirqd+0x0/0xd1
[<c012d289>] kthread+0x0/0xaf
[<c01032f1>] kernel_thread_helper+0x5/0xb
preempt count: 00000003
. 3-level deep critical section nesting:
.. entry 1: down_write+0x95/0x97 / (dev_queue_xmit_nit+0x41/0x127)
.. entry 2: __down_write+0x43/0x190 / (down_write+0x52/0x97)
.. entry 3: print_traces+0x1d/0x56 / (dump_stack+0x23/0x27)

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