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Date:	Tue, 22 Aug 2006 12:56:51 +0100
From:	Mark Hindley <mark@...dley.org.uk>
To:	linux-kernel@...r.kernel.org
Subject: [2.6.1{5,6,7}at least] Multiple cron hang in fork on reboot

I have been suffering from this problem intermittently at least since
2.6.15. Just rebooted 2.6.17.9 and it has happened again.

Symptoms: After a reboot I get multiple cron processes stuck in fork.
Loadavg rises. Sometimes the stuck processes clear in about 12 hours, but often the
system crashes and reboots.

This time I have unwind info compiled in and have dumped the active task
list (see below).

System is Acer aspire 1350, debian testing. Config attached.

Let me know if you need any more info.

Thanks,

Mark

ps -lfC cron

F S UID        PID  PPID  C PRI  NI ADDR SZ WCHAN  STIME TTY          TIME CMD
5 S root      3670     1  0  76   0 -  1569 -      10:00 ?        00:00:00 /usr/sbin/cron
1 D root      9780  3670  0  77   0 -  1606 fork   11:08 ?        00:00:00 /USR/SBIN/CRON
5 S root      9781  9780  0  75   0 -  1606 -      11:08 ?        00:00:00 /USR/SBIN/CRON
1 D root      9842  3670  0  78   0 -  1606 fork   11:09 ?        00:00:00 /USR/SBIN/CRON
5 S root      9843  9842  0  75   0 -  1606 -      11:09 ?        00:00:00 /USR/SBIN/CRON
1 D root     10209  3670  0  77   0 -  1606 fork   11:15 ?        00:00:00 /USR/SBIN/CRON
1 D root     10210  3670  0  77   0 -  1606 fork   11:15 ?        00:00:00 /USR/SBIN/CRON
5 S root     10211 10209  0  75   0 -  1606 -      11:15 ?        00:00:00 /USR/SBIN/CRON
5 S root     10212 10210  0  75   0 -  1606 -      11:15 ?        00:00:00 /USR/SBIN/CRON
1 D root     10337  3670  0  78   0 -  1606 fork   11:17 ?        00:00:00 /USR/SBIN/CRON
5 S root     10338 10337  0  75   0 -  1606 -      11:17 ?        00:00:00 /USR/SBIN/CRON
1 D root     10710  3670  0  78   0 -  1606 fork   11:23 ?        00:00:00 /USR/SBIN/CRON
5 S root     10711 10710  0  75   0 -  1606 -      11:23 ?        00:00:00 /USR/SBIN/CRON
1 D root     11137  3670  0  77   0 -  1606 fork   11:30 ?        00:00:00 /USR/SBIN/CRON
1 D root     11138  3670  0  77   0 -  1606 fork   11:30 ?        00:00:00 /USR/SBIN/CRON
1 D root     11139  3670  0  77   0 -  1606 fork   11:30 ?        00:00:00 /USR/SBIN/CRON
5 S root     11140 11137  0  75   0 -  1606 -      11:30 ?        00:00:00 /USR/SBIN/CRON
5 S root     11141 11138  0  75   0 -  1606 -      11:30 ?        00:00:00 /USR/SBIN/CRON
5 S root     11142 11139  0  75   0 -  1606 -      11:30 ?        00:00:00 /USR/SBIN/CRON
1 D root     11447  3670  0  78   0 -  1606 fork   11:35 ?        00:00:00 /USR/SBIN/CRON
5 S root     11448 11447  0  75   0 -  1606 -      11:35 ?        00:00:00 /USR/SBIN/CRON
1 D root     11633  3670  0  77   0 -  1606 fork   11:38 ?        00:00:00 /USR/SBIN/CRON
5 S root     11634 11633  0  75   0 -  1606 -      11:38 ?        00:00:00 /USR/SBIN/CRON
1 D root     11695  3670  0  77   0 -  1606 fork   11:39 ?        00:00:00 /USR/SBIN/CRON
5 S root     11696 11695  0  75   0 -  1606 -      11:39 ?        00:00:00 /USR/SBIN/CRON
1 D root     12066  3670  0  78   0 -  1606 fork   11:45 ?        00:00:00 /USR/SBIN/CRON
1 D root     12067  3670  0  77   0 -  1606 fork   11:45 ?        00:00:00 /USR/SBIN/CRON
5 S root     12068 12067  0  75   0 -  1606 -      11:45 ?        00:00:00 /USR/SBIN/CRON
5 S root     12069 12066  0  75   0 -  1606 -      11:45 ?        00:00:00 /USR/SBIN/CRON
1 D root     12558  3670  0  78   0 -  1606 fork   11:53 ?        00:00:00 /USR/SBIN/CRON
5 S root     12559 12558  0  75   0 -  1606 -      11:53 ?        00:00:00 /USR/SBIN/CRON
1 D root     13017  3670  0  77   0 -  1606 fork   12:00 ?        00:00:00 /USR/SBIN/CRON
1 D root     13018  3670  0  77   0 -  1606 fork   12:00 ?        00:00:00 /USR/SBIN/CRON
1 D root     13019  3670  0  77   0 -  1606 fork   12:00 ?        00:00:00 /USR/SBIN/CRON
5 S root     13020 13018  0  75   0 -  1606 -      12:00 ?        00:00:00 /USR/SBIN/CRON
5 S root     13021 13019  0  75   0 -  1606 -      12:00 ?        00:00:00 /USR/SBIN/CRON
5 S root     13022 13017  0  75   0 -  1606 -      12:00 ?        00:00:00 /USR/SBIN/CRON
1 D root     13329  3670  0  77   0 -  1606 fork   12:05 ?        00:00:00 /USR/SBIN/CRON
1 D root     13330  3670  0  77   0 -  1606 fork   12:05 ?        00:00:00 /USR/SBIN/CRON
5 S root     13331 13330  0  75   0 -  1606 -      12:05 ?        00:00:00 /USR/SBIN/CRON
5 S root     13332 13329  0  75   0 -  1606 -      12:05 ?        00:00:00 /USR/SBIN/CRON
1 D root     13517  3670  0  78   0 -  1606 fork   12:08 ?        00:00:00 /USR/SBIN/CRON
5 S root     13518 13517  0  75   0 -  1606 -      12:08 ?        00:00:00 /USR/SBIN/CRON
1 D root     13582  3670  0  78   0 -  1606 fork   12:09 ?        00:00:00 /USR/SBIN/CRON
5 S root     13583 13582  0  75   0 -  1606 -      12:09 ?        00:00:00 /USR/SBIN/CRON
1 D root     13951  3670  0  78   0 -  1606 fork   12:15 ?        00:00:00 /USR/SBIN/CRON
1 D root     13952  3670  0  77   0 -  1606 fork   12:15 ?        00:00:00 /USR/SBIN/CRON
5 S root     13953 13952  0  76   0 -  1606 -      12:15 ?        00:00:00 /USR/SBIN/CRON
5 S root     13954 13951  0  76   0 -  1606 -      12:15 ?        00:00:00 /USR/SBIN/CRON
1 D root     14078  3670  0  77   0 -  1606 fork   12:17 ?        00:00:00 /USR/SBIN/CRON
5 S root     14079 14078  0  76   0 -  1606 -      12:17 ?        00:00:00 /USR/SBIN/CRON
1 D root     14446  3670  0  78   0 -  1606 fork   12:23 ?        00:00:00 /USR/SBIN/CRON
5 S root     14447 14446  0  76   0 -  1606 -      12:23 ?        00:00:00 /USR/SBIN/CRON
1 D root     14874  3670  0  77   0 -  1606 fork   12:30 ?        00:00:00 /USR/SBIN/CRON
1 D root     14875  3670  0  77   0 -  1606 fork   12:30 ?        00:00:00 /USR/SBIN/CRON
1 D root     14876  3670  0  77   0 -  1606 fork   12:30 ?        00:00:00 /USR/SBIN/CRON
5 S root     14877 14875  0  76   0 -  1606 -      12:30 ?        00:00:00 /USR/SBIN/CRON
5 S root     14878 14874  0  76   0 -  1606 -      12:30 ?        00:00:00 /USR/SBIN/CRON
5 S root     14879 14876  0  76   0 -  1606 -      12:30 ?        00:00:00 /USR/SBIN/CRON
1 D root     15212  3670  0  77   0 -  1606 fork   12:35 ?        00:00:00 /USR/SBIN/CRON
5 S root     15213 15212  0  76   0 -  1606 -      12:35 ?        00:00:00 /USR/SBIN/CRON
1 D root     15452  3670  0  78   0 -  1606 fork   12:38 ?        00:00:00 /USR/SBIN/CRON
5 S root     15453 15452  0  76   0 -  1606 -      12:38 ?        00:00:00 /USR/SBIN/CRON
1 D root     15521  3670  0  78   0 -  1606 fork   12:39 ?        00:00:00 /USR/SBIN/CRON
5 S root     15522 15521  0  76   0 -  1606 -      12:39 ?        00:00:00 /USR/SBIN/CRON
1 D root     15598  3670  0  78   0 -  1606 fork   12:40 ?        00:00:00 /USR/SBIN/CRON
5 S root     15599 15598  0  76   0 -  1606 -      12:40 ?        00:00:00 /USR/SBIN/CRON
1 D root     15943  3670  0  78   0 -  1606 fork   12:45 ?        00:00:00 /USR/SBIN/CRON
1 D root     15944  3670  0  79   0 -  1606 fork   12:45 ?        00:00:00 /USR/SBIN/CRON
5 S root     15945 15944  0  80   0 -  1606 -      12:45 ?        00:00:00 /USR/SBIN/CRON
5 S root     15946 15943  0  79   0 -  1606 -      12:45 ?        00:00:00 /USR/SBIN/CRON



sysrq t
dmesg -s 100000

023ec7f> tcp_sendmsg+0x8f5/0x996
 <c015fb10> touch_atime+0x65/0xa6  <c01326ee> do_generic_mapping_read+0x3f7/0x3ff
 <c0159dcd> core_sys_select+0x246/0x30a  <c0215f7f> sock_aio_write+0x53/0x61
 <c014a5ff> do_sync_write+0xbb/0xf9  <c012604a> autoremove_wake_function+0x0/0x2d
 <c0159f2c> sys_select+0x9b/0x15c  <c014a722> vfs_write+0xe5/0x11e
 <c0102b37> syscall_call+0x7/0xb 
cron          D C816DF24     0 13582   3670 13583   13951 13517 (NOTLB)
       c816df14 00000282 c4812050 c816df24 c0115061 c0132e0b 00000002 c4812160 
       00ea6274 c4812050 00000000 d4335500 000f4913 c974e030 c974e138 c816df88 
       c816c000 c816df50 c816df68 c025f319 00000000 c974e030 c0113afe 00000000 
Call Trace:
 <c0115061> alloc_files+0x12/0x6d  <c0132e0b> filemap_nopage+0x17f/0x2cf
 <c025f319> wait_for_completion+0x80/0xc3  <c0113afe> default_wake_function+0x0/0xc
 <c0113afe> default_wake_function+0x0/0xc  <c0116142> do_fork+0x13e/0x16e
 <c0101a83> sys_vfork+0x18/0x1c  <c0102b37> syscall_call+0x7/0xb
cron          S C0DA3B48     0 13583  13582                     (NOTLB)
       c0da3b60 00000001 c71ea098 c0da3b48 cba83050 58db05c0 000f4a39 007a1200 
       00000000 c70120d0 00000000 58db05c0 000f4a39 c4812050 c4812158 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c021e032> dev_queue_xmit+0x1db/0x1e2  <c0238545> ip_output+0x19f/0x1d5
 <c02388fe> ip_queue_xmit+0x383/0x3bb  <c02189da> sk_reset_timer+0xc/0x15
 <c0247cb6> tcp_write_xmit+0x1e1/0x20a  <c0247cfd> __tcp_push_pending_frames+0x1e/0x6d
 <c023ec7f> tcp_sendmsg+0x8f5/0x996  <c015fb10> touch_atime+0x65/0xa6
 <c01326ee> do_generic_mapping_read+0x3f7/0x3ff  <c0159dcd> core_sys_select+0x246/0x30a
 <c0215f7f> sock_aio_write+0x53/0x61  <c014a5ff> do_sync_write+0xbb/0xf9
 <c012604a> autoremove_wake_function+0x0/0x2d  <c0159f2c> sys_select+0x9b/0x15c
 <c014a722> vfs_write+0xe5/0x11e  <c0102b37> syscall_call+0x7/0xb
cron          D C8ACBF24     0 13951   3670 13954   13952 13582 (NOTLB)
       c8acbf14 00000282 c5519a90 c8acbf24 c0115061 cbeedd70 cbeedd60 c5519ba0 
       00f55582 c5519a90 00000000 a804b600 000f4967 c8824a70 c8824b78 c8acbf88 
       c8aca000 c8acbf50 c8acbf68 c025f319 00000000 c8824a70 c0113afe 00000000 
Call Trace:
 <c0115061> alloc_files+0x12/0x6d  <c025f319> wait_for_completion+0x80/0xc3
 <c0113afe> default_wake_function+0x0/0xc  <c0113afe> default_wake_function+0x0/0xc
 <c0116142> do_fork+0x13e/0x16e  <c0101a83> sys_vfork+0x18/0x1c
 <c0102b37> syscall_call+0x7/0xb 
cron          D 00000010     0 13952   3670 13953   14078 13951 (NOTLB)
       c1cf1f14 c1cf0000 c0147d05 00000010 cbeedd20 00000001 000000d0 00000000 
       00000000 c8824570 00000000 a6e2cb40 000f4967 c8824070 c8824178 c1cf1f88 
       c1cf0000 c1cf1f50 c1cf1f68 c025f319 00000000 c8824070 c0113afe 00000000 
Call Trace:
 <c0147d05> cache_grow+0x101/0x15a  <c025f319> wait_for_completion+0x80/0xc3
 <c0113afe> default_wake_function+0x0/0xc  <c0113afe> default_wake_function+0x0/0xc
 <c0116142> do_fork+0x13e/0x16e  <c0101a83> sys_vfork+0x18/0x1c
 <c0102b37> syscall_call+0x7/0xb 
cron          S C8A99B48     0 13953  13952                     (NOTLB)
       c8a99b60 00000001 c71ea098 c8a99b48 c5519a90 55fe99c0 000f4a39 00000000 
       00000000 cb5e7ad0 00000000 58db05c0 000f4a39 c8824570 c8824678 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c021e032> dev_queue_xmit+0x1db/0x1e2
 <c0242db0> tcp_ack_saw_tstamp+0x14/0x43  <c02432c8> tcp_clean_rtx_queue+0x2d2/0x3eb
 <c0242e30> tcp_cong_avoid+0x15/0x25  <c0243803> tcp_ack+0x1cc/0x257
 <c02452a9> tcp_rcv_established+0x125/0x599  <c02452b1> tcp_rcv_established+0x12d/0x599
 <c024bfd5> tcp_v4_rcv+0x4fb/0x78b  <c0113b3c> __wake_up_common+0x32/0x54
 <c0235a4c> ip_local_deliver+0x192/0x19d  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c023ec7f> tcp_sendmsg+0x8f5/0x996  <c015fb10> touch_atime+0x65/0xa6
 <c01326ee> do_generic_mapping_read+0x3f7/0x3ff  <c0159dcd> core_sys_select+0x246/0x30a
 <c0215f7f> sock_aio_write+0x53/0x61  <c014a5ff> do_sync_write+0xbb/0xf9
 <c012604a> autoremove_wake_function+0x0/0x2d  <c0159f2c> sys_select+0x9b/0x15c
 <c014a722> vfs_write+0xe5/0x11e  <c0102b37> syscall_call+0x7/0xb
cron          S C11C2AB0     0 13954  13951                     (NOTLB)
       c87a5b60 c03b13e0 00000000 c11c2ab0 c5519590 58db05c0 000f4a39 007a1200 
       00000000 c8824570 00000000 58db05c0 000f4a39 c5519a90 c5519b98 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c021e032> dev_queue_xmit+0x1db/0x1e2  <c0238545> ip_output+0x19f/0x1d5
 <c02388fe> ip_queue_xmit+0x383/0x3bb  <c0135a84> buffered_rmqueue+0x12b/0x15a
 <c0135bd8> get_page_from_freelist+0x7a/0x93  <c0135c38> __alloc_pages+0x47/0x260
 <c02189da> sk_reset_timer+0xc/0x15  <c0247cb6> tcp_write_xmit+0x1e1/0x20a
 <c0247cfd> __tcp_push_pending_frames+0x1e/0x6d  <c023ec7f> tcp_sendmsg+0x8f5/0x996
 <c015fb10> touch_atime+0x65/0xa6  <c01326ee> do_generic_mapping_read+0x3f7/0x3ff
 <c0159dcd> core_sys_select+0x246/0x30a  <c0215f7f> sock_aio_write+0x53/0x61
 <c014a5ff> do_sync_write+0xbb/0xf9  <c012604a> autoremove_wake_function+0x0/0x2d
 <c0159f2c> sys_select+0x9b/0x15c  <c014a722> vfs_write+0xe5/0x11e
 <c0102b37> syscall_call+0x7/0xb 
cron          D C1F75EEC     0 14078   3670 14079   14446 13952 (NOTLB)
       c1f75f14 ffffffff c5519090 c1f75eec c025f225 c7b00778 00000000 c7b006f4 
       c7b006c8 c5519590 00000000 9a7bae00 000f4983 c5519090 c5519198 c1f75f88 
       c1f74000 c1f75f50 c1f75f68 c025f319 00000000 c5519090 c0113afe 00000000 
Call Trace:
 <c025f225> preempt_schedule+0x3e/0x54  <c025f319> wait_for_completion+0x80/0xc3
 <c0113afe> default_wake_function+0x0/0xc  <c0113afe> default_wake_function+0x0/0xc
 <c0116142> do_fork+0x13e/0x16e  <c0101a83> sys_vfork+0x18/0x1c
 <c0102b37> syscall_call+0x7/0xb 
cron          S C2067B48     0 14079  14078                     (NOTLB)
       c2067b60 00000001 c71ea098 c2067b48 c4e43ab0 58db05c0 000f4a39 007a1200 
       00000000 c5519a90 00000000 58db05c0 000f4a39 c5519590 c5519698 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c021e032> dev_queue_xmit+0x1db/0x1e2
 <c0242db0> tcp_ack_saw_tstamp+0x14/0x43  <c02432c8> tcp_clean_rtx_queue+0x2d2/0x3eb
 <c0242e30> tcp_cong_avoid+0x15/0x25  <c0243803> tcp_ack+0x1cc/0x257
 <c02452a9> tcp_rcv_established+0x125/0x599  <c02452b1> tcp_rcv_established+0x12d/0x599
 <c024bfd5> tcp_v4_rcv+0x4fb/0x78b  <c0113b3c> __wake_up_common+0x32/0x54
 <c0235a4c> ip_local_deliver+0x192/0x19d  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c023ec7f> tcp_sendmsg+0x8f5/0x996  <c015fb10> touch_atime+0x65/0xa6
 <c01326ee> do_generic_mapping_read+0x3f7/0x3ff  <c0159dcd> core_sys_select+0x246/0x30a
 <c0215f7f> sock_aio_write+0x53/0x61  <c014a5ff> do_sync_write+0xbb/0xf9
 <c012604a> autoremove_wake_function+0x0/0x2d  <c0159f2c> sys_select+0x9b/0x15c
 <c014a722> vfs_write+0xe5/0x11e  <c0102b37> syscall_call+0x7/0xb
cron          D C6CC3F24     0 14446   3670 14447   14874 14078 (NOTLB)
       c6cc3f14 00000282 c4e43ab0 c6cc3f24 c0115061 c0132e0b 00000002 c4e43bc0 
       0103f996 c4e43ab0 00000000 6e8a1800 000f49d7 c4e430b0 c4e431b8 c6cc3f88 
       c6cc2000 c6cc3f50 c6cc3f68 c025f319 00000000 c4e430b0 c0113afe 00000000 
Call Trace:
 <c0115061> alloc_files+0x12/0x6d  <c0132e0b> filemap_nopage+0x17f/0x2cf
 <c025f319> wait_for_completion+0x80/0xc3  <c0113afe> default_wake_function+0x0/0xc
 <c0113afe> default_wake_function+0x0/0xc  <c0116142> do_fork+0x13e/0x16e
 <c0101a83> sys_vfork+0x18/0x1c  <c0102b37> syscall_call+0x7/0xb
cron          S C8A95B48     0 14447  14446                     (NOTLB)
       c8a95b60 00000001 c71ea098 c8a95b48 c08d8a90 58db05c0 000f4a39 007a1200 
       00000000 c5519590 00000000 58db05c0 000f4a39 c4e43ab0 c4e43bb8 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c021e032> dev_queue_xmit+0x1db/0x1e2  <c0238545> ip_output+0x19f/0x1d5
 <c02388fe> ip_queue_xmit+0x383/0x3bb  <c02189da> sk_reset_timer+0xc/0x15
 <c0247cb6> tcp_write_xmit+0x1e1/0x20a  <c0247cfd> __tcp_push_pending_frames+0x1e/0x6d
 <c023ec7f> tcp_sendmsg+0x8f5/0x996  <c015fb10> touch_atime+0x65/0xa6
 <c01326ee> do_generic_mapping_read+0x3f7/0x3ff  <c0159dcd> core_sys_select+0x246/0x30a
 <c0215f7f> sock_aio_write+0x53/0x61  <c014a5ff> do_sync_write+0xbb/0xf9
 <c012604a> autoremove_wake_function+0x0/0x2d  <c0159f2c> sys_select+0x9b/0x15c
 <c014a722> vfs_write+0xe5/0x11e  <c0102b37> syscall_call+0x7/0xb
cron          D 00000020     0 14874   3670 14878   14875 14446 (NOTLB)
       c1ed7f14 c7b004b4 c7b00488 00000020 0000007b 0000007b ffffff05 c01151f1 
       00000060 c08d3ad0 0001e848 55660340 000f4a39 c1932550 c1932658 c1ed7f88 
       c1ed6000 c1ed7f50 c1ed7f68 c025f319 00000000 c1932550 c0113afe 00000000 
Call Trace:
 <c01151f1> dup_fd+0x135/0x226  <c025f319> wait_for_completion+0x80/0xc3
 <c0113afe> default_wake_function+0x0/0xc  <c0113afe> default_wake_function+0x0/0xc
 <c0116142> do_fork+0x13e/0x16e  <c0101a83> sys_vfork+0x18/0x1c
 <c0102b37> syscall_call+0x7/0xb 
cron          D C8039F24     0 14875   3670 14877   14876 14874 (NOTLB)
       c8039f14 00000282 c08d3ad0 c8039f24 c0115061 cbeed4b0 cbeed4a0 c08d3be0 
       0110c56a c1932550 00000000 5556c100 000f4a39 c4e435b0 c4e436b8 c8039f88 
       c8038000 c8039f50 c8039f68 c025f319 00000000 c4e435b0 c0113afe 00000000 
Call Trace:
 <c0115061> alloc_files+0x12/0x6d  <c025f319> wait_for_completion+0x80/0xc3
 <c0113afe> default_wake_function+0x0/0xc  <c0113afe> default_wake_function+0x0/0xc
 <c0116142> do_fork+0x13e/0x16e  <c0101a83> sys_vfork+0x18/0x1c
 <c0102b37> syscall_call+0x7/0xb 
cron          D 00000010     0 14876   3670 14879         14875 (NOTLB)
       ca09df14 ca09c000 c0147d05 00000010 cbeedd20 55a30c40 000f4a39 000f4240 
       00000000 c08d35d0 00000000 55a30c40 000f4a39 c1932a50 c1932b58 ca09df88 
       ca09c000 ca09df50 ca09df68 c025f319 00000000 c1932a50 c0113afe 00000000 
Call Trace:
 <c0147d05> cache_grow+0x101/0x15a  <c025f319> wait_for_completion+0x80/0xc3
 <c0113afe> default_wake_function+0x0/0xc  <c0113afe> default_wake_function+0x0/0xc
 <c0116142> do_fork+0x13e/0x16e  <c0101a83> sys_vfork+0x18/0x1c
 <c0102b37> syscall_call+0x7/0xb 
cron          S C05AFB48     0 14877  14875                     (NOTLB)
       c05afb60 00000001 c71ea098 c05afb48 c08d35d0 00000000 00000000 c9fbbd00 
       00000001 c883f530 00000000 5945d580 000f4a39 c08d3ad0 c08d3bd8 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c021e032> dev_queue_xmit+0x1db/0x1e2  <c0238545> ip_output+0x19f/0x1d5
 <c02388fe> ip_queue_xmit+0x383/0x3bb  <c02189da> sk_reset_timer+0xc/0x15
 <c0247cb6> tcp_write_xmit+0x1e1/0x20a  <c0247cfd> __tcp_push_pending_frames+0x1e/0x6d
 <c023ec7f> tcp_sendmsg+0x8f5/0x996  <c015fb10> touch_atime+0x65/0xa6
 <c01326ee> do_generic_mapping_read+0x3f7/0x3ff  <c0159dcd> core_sys_select+0x246/0x30a
 <c0215f7f> sock_aio_write+0x53/0x61  <c014a5ff> do_sync_write+0xbb/0xf9
 <c012604a> autoremove_wake_function+0x0/0x2d  <c0159f2c> sys_select+0x9b/0x15c
 <c014a722> vfs_write+0xe5/0x11e  <c0102b37> syscall_call+0x7/0xb
cron          S C11C2AB0     0 14878  14874                     (NOTLB)
       c051bb60 c03b13e0 00000000 c11c2ab0 c08d30d0 5945d580 000f4a39 00e4e1c0 
       00000000 c08d3ad0 00000000 5945d580 000f4a39 c08d35d0 c08d36d8 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c021e032> dev_queue_xmit+0x1db/0x1e2  <c0238545> ip_output+0x19f/0x1d5
 <c02388fe> ip_queue_xmit+0x383/0x3bb  <c0135a84> buffered_rmqueue+0x12b/0x15a
 <c0135bd8> get_page_from_freelist+0x7a/0x93  <c0135c38> __alloc_pages+0x47/0x260
 <c0246ac4> tcp_transmit_skb+0x37e/0x39c  <c0247cb6> tcp_write_xmit+0x1e1/0x20a
 <c0247cfd> __tcp_push_pending_frames+0x1e/0x6d  <c023ec7f> tcp_sendmsg+0x8f5/0x996
 <c015fb10> touch_atime+0x65/0xa6  <c01326ee> do_generic_mapping_read+0x3f7/0x3ff
 <c0159dcd> core_sys_select+0x246/0x30a  <c0215f7f> sock_aio_write+0x53/0x61
 <c014a5ff> do_sync_write+0xbb/0xf9  <c012604a> autoremove_wake_function+0x0/0x2d
 <c0159f2c> sys_select+0x9b/0x15c  <c014a722> vfs_write+0xe5/0x11e
 <c0102b37> syscall_call+0x7/0xb 
cron          S C11C2AB0     0 14879  14876                     (NOTLB)
       c04b7b60 c03b13e0 00000000 c11c2ab0 cb5e7ad0 5945d580 000f4a39 00e4e1c0 
       00000000 c08d35d0 00000000 5945d580 000f4a39 c08d30d0 c08d31d8 7fffffff 
       00000000 00000000 00000040 c025f968 00000145 c023dc12 00000000 0000c4b0 
Call Trace:
 <c025f968> schedule_timeout+0x13/0x8d  <c023dc12> tcp_poll+0x16/0x11f
 <c0159b3e> do_select+0x2be/0x307  <c015978c> __pollwait+0x0/0x44
 <c0113afe> default_wake_function+0x0/0xc  <c0235de9> ip_rcv+0x392/0x3c1
 <c025f13f> schedule+0x489/0x531  <c025f225> preempt_schedule+0x3e/0x54
 <c021e032> dev_queue_xmit+0x1db/0x1e2  <c0238545> ip_output+0x19f/0x1d5
 <c02388fe> ip_queue_xmit+0x383/0x3bb  <c0135c38> __alloc_pages+0x47/0x260
 <c013ce33> do_anonymous_page+0xb8/0x139  <c013d1bc> __handle_mm_fault+0xa5/0x183
 <c0112386> do_page_fault+0x239/0x589  <c02189da> sk_reset_timer+0xc/0x15
 <c0247cb6> tcp_write_xmit+0x1e1/0x20a  <c0247cfd> __tcp_push_pending_frames+0x1e/0x6d
 <c023ec7f> tcp_sendmsg+0x8f5/0x996  <c0113b3c> __wake_up_common+0x32/0x54
 <c0159dcd> core_sys_select+0x246/0x30a  <c0215f7f> sock_aio_write+0x53/0x61
 <c025f282> preempt_schedule_irq+0x47/0x5e  <c014a5ff> do_sync_write+0xbb/0xf9
 <c012604a> autoremove_wake_function+0x0/0x2d  <c0159f2c> sys_select+0x9b/0x15c
 <c014a722> vfs_write+0xe5/0x11e  <c0102b37> syscall_call+0x7/0xb

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