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Date: Tue, 24 Apr 2007 15:07:51 +0200
From: Andi Kleen <ak@...e.de>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, trond.myklebust@....uio.no
Subject: deadlock in 2.6.21-rc7-gitduring LTP mmap01 over nfs/no swap
I ran LTP on a 512MB i386 UP nfsroot test system with no swap with
2.6.21-rc7-git6
It deadlocked during the LTP run with no progress anymore and
ssh remote login not working anymore:
<<<test_output>>>
mmap001 0 INFO : mmap()ing file of 10000 pages or 40960000 bytes
mmap001 1 PASS : mmap() completed successfully.
mmap001 0 INFO : touching mmaped memory
mmap001 2 PASS : we're still here, mmaped area must be good
... hang...
sysreq-m:
Mem-info:
DMA per-cpu:
CPU 0: Hot: hi: 0, btch: 1 usd: 0 Cold: hi: 0, btch: 1 usd: 0
Normal per-cpu:
CPU 0: Hot: hi: 186, btch: 31 usd: 154 Cold: hi: 62, btch: 15 usd: 11
Active:9293 inactive:34731 dirty:4261 writeback:5713 unstable:0
free:79407 slab:4268 mapped:11117 pagetables:93 bounce:0
DMA free:10768kB min:88kB low:108kB high:132kB active:0kB inactive:0kB present:16256kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 491 491
Normal free:306860kB min:2788kB low:3484kB high:4180kB active:37172kB inactive:138924kB present:502860kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0
DMA: 4*4kB 4*8kB 2*16kB 4*32kB 3*64kB 3*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 2*4096kB = 10768kB
Normal: 1*4kB 3*8kB 1*16kB 0*32kB 0*64kB 1*128kB 0*256kB 1*512kB 1*1024kB 1*2048kB 74*4096kB = 306860kB
Swap cache: add 0, delete 0, find 0/0, race 0+0
Free swap = 0kB
Total swap = 0kB
Free swap: 0kB
130800 pages of RAM
0 pages of HIGHMEM
2637 reserved pages
20071 pages shared
0 pages swap cached
4261 pages dirty
5713 pages writeback
11117 pages mapped
4268 pages slab
93 pages pagetables
Excerpts from sysrq-t output:
rpciod/0 S 00000000 0 938 7 (L-TLB)
c17bdf8c 00000046 df989f60 00000000 00000001 c17bdf64 c0113f7a 00000000
0000000a c14d0ab0 db56d570 9dcdf400 000004d7 00000000 c14d0bbc c1404fe0
00000000 db613ac0 ffffffff 00000000 00000246 df989f40 c14a1b24 c17bdfbc
Call Trace:
[<c0113f7a>] __wake_up+0x32/0x43
[<c01272c9>] worker_thread+0xd0/0x124
[<c0115b8a>] default_wake_function+0x0/0xc
[<c01271f9>] worker_thread+0x0/0x124
[<c01297b8>] kthread+0xb0/0xd8
[<c0129708>] kthread+0x0/0xd8
[<c0103cbb>] kernel_thread_helper+0x7/0x10
pdflush S 00000000 0 198 7 (L-TLB)
dfe95fa4 00000046 c1402280 00000000 dfed7a30 c0113ff2 c15435b0 c15435b0
00000001 c15435b0 dfedfab0 726509e3 00000007 00000426 c15436bc c1404fe0
00000000 c052e280 c01141cb c1405028 00000286 dfe95fbc c14a1f50 c013d3ae
Call Trace:
[<c0113ff2>] task_rq_lock+0x31/0x58
[<c01141cb>] set_user_nice+0xca/0xd1
[<c013d3ae>] pdflush+0x0/0x19d
[<c013d45a>] pdflush+0xac/0x19d
[<c01297b8>] kthread+0xb0/0xd8
[<c0129708>] kthread+0x0/0xd8
[<c0103cbb>] kernel_thread_helper+0x7/0x10
kswapd0 S DFEBFF68 0 200 7 (L-TLB)
dfebff48 00000046 dfebff6b dfebff68 ffffffff c0113ff2 dfe79530 dfe79530
00000001 dfe79530 dfedfab0 72940801 00000007 00000415 dfe7963c c1404fe0
00000000 c052e280 dfe756c0 00000246 c0129994 dfe79530 c14a1f48 dfebffac
Call Trace:
[<c0113ff2>] task_rq_lock+0x31/0x58
[<c0129994>] prepare_to_wait+0x12/0x49
[<c013f94d>] kswapd+0xb4/0x3cf
[<c040b327>] __sched_text_start+0x6cf/0x77e
[<c0129881>] autoremove_wake_function+0x0/0x35
[<c0113ee8>] complete+0x39/0x48
[<c013f899>] kswapd+0x0/0x3cf
[<c01297b8>] kthread+0xb0/0xd8
[<c0129708>] kthread+0x0/0xd8
[<c0103cbb>] kernel_thread_helper+0x7/0x10
pan S DF945A20 0 2203 1 (NOTLB)
db59ff54 00000082 c01233c6 df945a20 db59ff24 0000000f 0000000f c0123404
0000000a db46a030 dfd435b0 2adf0400 000004cf 00000000 db46a13c c1404fe0
00000000 db44d040 db46b400 c05dcf20 00000246 ffffffff 00000001 d9b13ab0
Call Trace:
[<c01233c6>] __kill_pgrp_info+0x2f/0x4f
[<c0123404>] kill_pgrp_info+0x1e/0x29
[<c011c30f>] do_wait+0x885/0x957
[<c0115b8a>] default_wake_function+0x0/0xc
[<c011c412>] sys_wait4+0x31/0x34
[<c01030e0>] syscall_call+0x7/0xb
mmap001 D D56DDEAC 0 6777 2203 (NOTLB)
d56ddec0 00000082 00000002 d56ddeac d56ddea8 00000000 db728c80 c1345520
0000000a d9b13ab0 c052e440 8a2d5200 000004ce 00000000 d9b13bbc c1404fe0
00000000 df146c80 ffffffff 00000000 00000000 c1404fe0 00000000 d56ddefc
Call Trace:
[<c040b913>] io_schedule+0x22/0x2c
[<c01380be>] sync_page+0x38/0x3b
[<c040bb9a>] __wait_on_bit+0x33/0x58
[<c0138086>] sync_page+0x0/0x3b
[<c01381f8>] wait_on_page_bit+0x61/0x66
[<c01298b6>] wake_bit_function+0x0/0x3c
[<c0138b70>] wait_on_page_writeback_range+0x4d/0xf8
[<c016b488>] do_fsync+0x7b/0x83
[<c0147307>] sys_msync+0xf3/0x158
[<c01030e0>] syscall_call+0x7/0xb
cron S DB9437D0 0 6779 1718 (NOTLB)
d5311e5c 00000086 db943874 db9437d0 01000000 00000000 00000000 df9e9480
00000005 dfd430b0 dfa2eab0 b46c6400 0000016f 00000000 dfd431bc c1404fe0
00000000 db613900 c03ff343 00000246 c0129994 df811a00 db69440c d5311e78
Call Trace:
[<c03ff343>] xs_udp_write_space+0xe/0x53
[<c0129994>] prepare_to_wait+0x12/0x49
[<c01574a2>] pipe_wait+0x51/0x6f
[<c0129881>] autoremove_wake_function+0x0/0x35
[<c0157b84>] pipe_read+0x2ad/0x31d
[<c011e027>] irq_exit+0x53/0x6b
[<c0105038>] do_IRQ+0x7e/0x92
[<c011e027>] irq_exit+0x53/0x6b
[<c015256b>] do_sync_read+0xc7/0x10a
[<c0129881>] autoremove_wake_function+0x0/0x35
[<c01524a4>] do_sync_read+0x0/0x10a
[<c0152cce>] vfs_read+0x88/0x10a
[<c01530ca>] sys_read+0x41/0x67
[<c01030e0>] syscall_call+0x7/0xb
sshd S DB57FB4C 0 6892 1666 (NOTLB)
db57fb60 00000086 00000002 db57fb4c db57fb48 00000000 c01219a5 00000286
0000000a c153e570 c052e440 47403200 000004d3 00000000 c153e67c c1404fe0
00000000 db637900 ffffffff 00000000 00000000 7fffffff dbad0780 0000000a
Call Trace:
[<c01219a5>] __mod_timer+0x90/0x9a
[<c040ba0c>] schedule_timeout+0x13/0x8d
[<c0254d9c>] tty_poll+0x53/0x60
[<c015c8a5>] do_select+0x365/0x3bc
[<c015ce47>] __pollwait+0x0/0xac
[<c0115b8a>] default_wake_function+0x0/0xc
[<c0115b8a>] default_wake_function+0x0/0xc
[<c0115b8a>] default_wake_function+0x0/0xc
[<c0115b8a>] default_wake_function+0x0/0xc
[<c039dd73>] __qdisc_run+0x2e/0x182
[<c0394b0d>] dev_queue_xmit+0x21b/0x23a
[<c0160532>] dput+0x22/0x11d
[<c03a86e1>] ip_output+0x173/0x1ab
[<c03a8f0f>] ip_queue_xmit+0x348/0x388
[<c03bae88>] tcp_v4_send_check+0x74/0xaa
[<c03b625b>] tcp_transmit_skb+0x639/0x667
[<c0158214>] do_lookup+0x4f/0x140
[<c02067fa>] _atomic_dec_and_lock+0x2a/0x44
[<c012189d>] lock_timer_base+0x15/0x2f
[<c01219a5>] __mod_timer+0x90/0x9a
[<c038c424>] sk_reset_timer+0xc/0x16
[<c03b7b97>] __tcp_push_pending_frames+0x6f4/0x7aa
[<c03e3a78>] ipv6_setsockopt+0x3e/0xaaa
[<c040c8ab>] _spin_lock_bh+0x8/0x18
[<c038c2e4>] release_sock+0x12/0x9c
[<c03ae46e>] tcp_sendmsg+0x8da/0x9c8
[<c015cba0>] core_sys_select+0x2a4/0x2c5
[<c0389f5c>] sock_aio_write+0xc8/0xd4
[<c0152461>] do_sync_write+0xc7/0x10a
[<c0129881>] autoremove_wake_function+0x0/0x35
[<c015cfc9>] sys_select+0xd6/0x187
[<c0153131>] sys_write+0x41/0x67
[<c01030e0>] syscall_call+0x7/0xb
=======================
-Andi
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