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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.3
Ingo Molnar wrote:
> * Michal Schmidt <xschmi00@stud.feec.vutbr.cz> wrote:
>
>>OK, re-reporting a network deadlock. It happens a few seconds after
>>starting Firefox. This is with -V0.3.2:
>
> i've uploaded -V0.4.1 with a fix that could fix this networking
> deadlock. Does it work any better?
>
> Ingo

Unfortunately, no. It's only slightly different:

BUG: semaphore recursion deadlock detected!
.. current task ksoftirqd/0/2 [f7c24020] is already holding c0438ec0
[w:f7c24020, d:0].
[<c01c7a08>] __rwsem_deadlock+0x188/0x1a0 (12)
[<c01c78ec>] __rwsem_deadlock+0x6c/0x1a0 (52)
[<c0134ac0>] _mutex_lock+0x40/0x50 (28)
[<c02cc153>] down_write_mutex+0x113/0x220 (24)
[<c01c8228>] down_mutex+0x8/0x10 (12)
[<c0134ac0>] _mutex_lock+0x40/0x50 (40)
[<c0281a16>] qdisc_restart+0x236/0x250 (24)
[<c0281d2e>] pfifo_fast_enqueue+0xe/0xc0 (8)
[<c02727dd>] dev_queue_xmit+0x1ad/0x260 (4)
[<c0114310>] mcount+0x14/0x18 (8)
[<c02727ef>] dev_queue_xmit+0x1bf/0x260 (36)
[<c0278b2e>] neigh_resolve_output+0xfe/0x240 (32)
[<c029383e>] ip_finish_output2+0xbe/0x240 (56)
[<c01c80be>] up_write_mutex+0x2e/0x60 (12)
[<c027e211>] nf_hook_slow+0xe1/0x130 (24)
[<c0293780>] ip_finish_output2+0x0/0x240 (28)
[<c029104b>] ip_finish_output+0x26b/0x270 (32)
[<c0293780>] ip_finish_output2+0x0/0x240 (24)
[<c029376a>] dst_output+0x1a/0x30 (32)
[<c027e211>] nf_hook_slow+0xe1/0x130 (12)
[<c0293750>] dst_output+0x0/0x30 (28)
[<c029170a>] ip_queue_xmit+0x45a/0x570 (32)
[<c0293750>] dst_output+0x0/0x30 (24)
[<c0135ef0>] sub_preempt_count+0x60/0xd0 (24)
[<c01c7f1e>] __up_write+0x10e/0x220 (12)
[<c0135ef0>] sub_preempt_count+0x60/0xd0 (4)
[<c0135958>] check_preempt_timing+0x58/0x2f0 (8)
[<c0135ef0>] sub_preempt_count+0x60/0xd0 (4)
[<c01c7f1e>] __up_write+0x10e/0x220 (4)
[<c013514d>] __mcount+0x1d/0x20 (32)
[<c01c775e>] rwsem_owner_del+0xe/0xf0 (4)
[<c013514d>] __mcount+0x1d/0x20 (40)
[<c02a8d1e>] tcp_v4_send_check+0xe/0xf0 (4)
[<c02a2819>] tcp_transmit_skb+0x439/0x880 (4)
[<c0114310>] mcount+0x14/0x18 (8)
[<c02a8d5f>] tcp_v4_send_check+0x4f/0xf0 (20)
[<c02a28c2>] tcp_transmit_skb+0x4e2/0x880 (32)
[<c0114310>] mcount+0x14/0x18 (28)
[<c02a5556>] tcp_send_ack+0xa6/0xf0 (52)
[<c02a0527>] __tcp_ack_snd_check+0x87/0xa0 (12)
[<c02a0f65>] tcp_rcv_established+0x6e5/0x920 (24)
[<c02aa20e>] tcp_v4_do_rcv+0x13e/0x150 (56)
[<c02aa8e0>] tcp_v4_rcv+0x6c0/0x8d0 (32)
[<c02cc11f>] down_write_mutex+0xdf/0x220 (28)
[<c028e09d>] ip_local_deliver_finish+0xbd/0x1a0 (52)
[<c01c80be>] up_write_mutex+0x2e/0x60 (12)
[<c027e211>] nf_hook_slow+0xe1/0x130 (24)
[<c028dfe0>] ip_local_deliver_finish+0x0/0x1a0 (28)
[<c028da76>] ip_local_deliver+0x1f6/0x220 (32)
[<c028dfe0>] ip_local_deliver_finish+0x0/0x1a0 (24)
[<c028e2c9>] ip_rcv_finish+0x149/0x300 (24)
[<c01c80be>] up_write_mutex+0x2e/0x60 (36)
[<c027e211>] nf_hook_slow+0xe1/0x130 (24)
[<c028e180>] ip_rcv_finish+0x0/0x300 (28)
[<c028df00>] ip_rcv+0x460/0x540 (32)
[<c028e180>] ip_rcv_finish+0x0/0x300 (24)
[<c0114310>] mcount+0x14/0x18 (8)
[<c0272d0d>] netif_receive_skb+0x12d/0x240 (28)
[<c0270008>] __scm_send+0x78/0x1e0 (20)
[<c027303f>] net_rx_action+0x7f/0x1a0 (4)
[<c0114310>] mcount+0x14/0x18 (8)
[<c0272ea8>] process_backlog+0x88/0x1a0 (20)
[<c027303f>] net_rx_action+0x7f/0x1a0 (40)
[<c0123887>] ___do_softirq+0x87/0xd0 (36)
[<c0123958>] _do_softirq+0x8/0x30 (8)
[<c0123d44>] ksoftirqd+0xb4/0x100 (4)
[<c0123970>] _do_softirq+0x20/0x30 (28)
[<c0123d44>] ksoftirqd+0xb4/0x100 (8)
[<c013406a>] kthread+0xaa/0xb0 (24)
[<c0123c90>] ksoftirqd+0x0/0x100 (20)
[<c0133fc0>] kthread+0x0/0xb0 (12)
[<c0103319>] kernel_thread_helper+0x5/0xc (16)
preempt count: 00000002
. 2-level deep critical section nesting:
.. entry 1: down_write_mutex+0x214/0x220 [<c02cc254>] /
(_mutex_lock+0x40/0x50 [<c0134ac0>])
.. entry 2: print_traces+0x1d/0x60 [<c013663d>] / (dump_stack+0x23/0x30
[<c01060b3>])

BUG: circular semaphore deadlock: firefox-bin/4792 is blocked on
c0438ec0, deadlocking ksoftirqd/0/2
f18119bc 00200086 f1fbe810 c03c1ca0 f1810000 0000196c f1810000 f1fbe810
00000000 f18119a8 00000167 4344b736 00000023 f1fbe810 f1fbeaa4
f1810000
f1fbe810 00000000 f18119e0 c02cae1f 00000054 00000008 f18119e0
00200046
Call Trace:
[<c02cae1f>] schedule+0x2f/0xe0 (80)
[<c02cc1a0>] down_write_mutex+0x160/0x220 (36)
[<c02cc268>] down_read_mutex+0x8/0x30 (12)
[<c0272251>] dev_queue_xmit_nit+0x41/0x130 (40)
[<c01c80be>] up_write_mutex+0x2e/0x60 (12)
[<c0281a03>] qdisc_restart+0x223/0x250 (24)
[<c02727dd>] dev_queue_xmit+0x1ad/0x260 (12)
[<c0114310>] mcount+0x14/0x18 (8)
[<c02727ef>] dev_queue_xmit+0x1bf/0x260 (36)
[<c0278b2e>] neigh_resolve_output+0xfe/0x240 (32)
[<c029383e>] ip_finish_output2+0xbe/0x240 (56)
[<c01c80be>] up_write_mutex+0x2e/0x60 (12)
[<c027e211>] nf_hook_slow+0xe1/0x130 (24)
[<c0293780>] ip_finish_output2+0x0/0x240 (28)
[<c029104b>] ip_finish_output+0x26b/0x270 (32)
[<c0293780>] ip_finish_output2+0x0/0x240 (24)
[<c029376a>] dst_output+0x1a/0x30 (32)
[<c027e211>] nf_hook_slow+0xe1/0x130 (12)
[<c0293750>] dst_output+0x0/0x30 (28)
[<c029170a>] ip_queue_xmit+0x45a/0x570 (32)
[<c0293750>] dst_output+0x0/0x30 (24)
[<c02cc11f>] down_write_mutex+0xdf/0x220 (24)
[<c0135ef0>] sub_preempt_count+0x60/0xd0 (4)
[<c01c7f1e>] __up_write+0x10e/0x220 (12)
[<c0135ef0>] sub_preempt_count+0x60/0xd0 (4)
[<c0135958>] check_preempt_timing+0x58/0x2f0 (8)
[<c0135ef0>] sub_preempt_count+0x60/0xd0 (4)
[<c01c7f1e>] __up_write+0x10e/0x220 (4)
[<c013514d>] __mcount+0x1d/0x20 (32)
[<c01c775e>] rwsem_owner_del+0xe/0xf0 (4)
[<c013514d>] __mcount+0x1d/0x20 (36)
[<c02a8d1e>] tcp_v4_send_check+0xe/0xf0 (4)
[<c02a2819>] tcp_transmit_skb+0x439/0x880 (4)
[<c0114310>] mcount+0x14/0x18 (8)
[<c02a8d5f>] tcp_v4_send_check+0x4f/0xf0 (20)
[<c02a28c2>] tcp_transmit_skb+0x4e2/0x880 (32)
[<c01c9f52>] memcpy+0x12/0x40 (36)
[<c02a37f4>] tcp_write_xmit+0x154/0x2d0 (44)
[<c0296eea>] tcp_sendmsg+0x50a/0x1130 (12)
[<c0114310>] mcount+0x14/0x18 (8)
[<c0296ebe>] tcp_sendmsg+0x4de/0x1130 (32)
[<c0268254>] sock_sendmsg+0xc4/0xe0 (84)
[<c02b9af0>] inet_sendmsg+0x50/0x60 (28)
[<c0268254>] sock_sendmsg+0xc4/0xe0 (28)
[<c0135958>] check_preempt_timing+0x58/0x2f0 (24)
[<c0135ef0>] sub_preempt_count+0x60/0xd0 (4)
[<c013514d>] __mcount+0x1d/0x20 (36)
[<c01c775e>] rwsem_owner_del+0xe/0xf0 (4)
[<c015ff59>] fget+0x59/0x70 (72)
[<c01c80be>] up_write_mutex+0x2e/0x60 (28)
[<c0134620>] autoremove_wake_function+0x0/0x60 (24)
[<c0267f8f>] sockfd_lookup+0x1f/0x80 (28)
[<c0114310>] mcount+0x14/0x18 (4)
[<c026990d>] sys_sendto+0xed/0x110 (20)
[<c01c80be>] up_write_mutex+0x2e/0x60 (72)
[<c0142cf2>] free_pages_bulk+0x1d2/0x2e0 (24)
[<c013514d>] __mcount+0x1d/0x20 (72)
[<c026993b>] sys_send+0xb/0x40 (4)
[<c026a1c3>] sys_socketcall+0x133/0x240 (4)
[<c0114310>] mcount+0x14/0x18 (8)
[<c026996b>] sys_send+0x3b/0x40 (20)
[<c026a1c3>] sys_socketcall+0x133/0x240 (32)
[<c010527b>] syscall_call+0x7/0xb (68)
preempt count: 00000002
. 2-level deep critical section nesting:
.. entry 1: __schedule+0x4e/0x6b0 [<c02ca78e>] / (schedule+0x2f/0xe0
[<c02cae1f>])
.. entry 2: __schedule+0xdd/0x6b0 [<c02ca81d>] / (schedule+0x2f/0xe0
[<c02cae1f>])


Michal
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