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Subjectdeadlock with 2.6.9
The machine collects remote syslog, roughly 1000 packets per second. The 
logs are burned to dvd several times per week. The hanging may have
coincided with the completion of one of the log burning sessions. Before
the last crash I was using ide-scsi to do the burning. Since the last
crash, I switched over to directly using the ide device and have disabled
ide-scsi.

The machine did not crash. Remote access with ssh would hang after
authentication. Already running processes that didn't fork anything
responded fine to the network. I could not fork a shell from a serial
console. I was able to use sysrq to pull debugging information. I was
also able to kill off all running processes (sysrq+e and sysrq+i), then
log in from the serial console and restart things.

I had the same problem with 2.6.8.1

Most of the processes seem to be stuck in schedule_timeout.

The full sysrq and .config are at http://hashbrown.cts.ucla.edu/deadlock/


cbs:~ > lsmod
Module Size Used by
sg 35040 0
sr_mod 14884 0
cdrom 38460 1 sr_mod
ide_scsi 15332 0
e100 29760 0
bonding 64552 0



telnet> send brk
SysRq : Show Regs

Pid: 0, comm: swapper
EIP: 0060:[<c01022cf>] CPU: 0
EIP is at default_idle+0x2f/0x40
EFLAGS: 00000246 Not tainted (2.6.9)
EAX: 00000000 EBX: c039b000 ECX: c01022a0 EDX: c039b000
ESI: c04080a0 EDI: c04081a0 EBP: c039bfc4 DS: 007b ES: 007b
CR0: 8005003b CR2: bffffd66 CR3: 0fb3f000 CR4: 000006d0
[<c0102516>] show_regs+0x146/0x170
[<c0207a81>] __handle_sysrq+0x71/0xf0
[<c021a5aa>] receive_chars+0x11a/0x230
[<c021a9bd>] serial8250_interrupt+0xdd/0xe0
[<c0106c96>] handle_IRQ_event+0x36/0x70
[<c0107063>] do_IRQ+0xe3/0x1b0
[<c0104cf0>] common_interrupt+0x18/0x20
[<c010235b>] cpu_idle+0x3b/0x50
[<c039cb8b>] start_kernel+0x16b/0x190
[<c0100211>] 0xc0100211



telnet> send brk
SysRq : Show Memory
Mem-info:
DMA per-cpu:
cpu 0 hot: low 2, high 6, batch 1
cpu 0 cold: low 0, high 2, batch 1
Normal per-cpu:
cpu 0 hot: low 30, high 90, batch 15
cpu 0 cold: low 0, high 30, batch 15
HighMem per-cpu: empty

Free pages: 1348kB (0kB HighMem)
Active:26008 inactive:2118 dirty:10 writeback:0 unstable:0 free:337
slab:16168 mapped:25917 pagetables:12564
DMA free:172kB min:32kB low:64kB high:96kB active:160kB inactive:48kB
present:16384kB
protections[]: 0 0 0
Normal free:1176kB min:480kB low:960kB high:1440kB active:103872kB
inactive:8424kB present:245760kB
protections[]: 0 0 0
HighMem free:0kB min:128kB low:256kB high:384kB active:0kB inactive:0kB
present:0kB
protections[]: 0 0 0
DMA: 23*4kB 2*8kB 0*16kB 0*32kB 1*64kB 0*128kB 0*256kB 0*512kB 0*1024kB
0*2048kB 0*4096kB = 172kB
Normal: 54*4kB 8*8kB 14*16kB 5*32kB 2*64kB 1*128kB 1*256kB 0*512kB
0*1024kB 0*2048kB 0*4096kB = 1176kB
HighMem: empty
Swap cache: add 66873, delete 65915, find 54916/55208, race 0+0
Free swap: 805560kB
65536 pages of RAM
0 pages of HIGHMEM
1786 reserved pages
600111 pages shared
958 pages swap cached




cron S C1205F60 0 2614 435 2628 2613 (NOTLB)
cde0bc9c 00000082 00000000 c1205f60 c12068c0 c4dba97c cde0bc94 c014584e
c4dba940 c57d3468 b7fe7000 00000001 c1205f60 001aff4a d6c5bd65 0003d278
c8c5e530 cf9aed40 7fffffff 00000001 cde0bcd8 c02f9f04 b7fe7000 00000001
Call Trace:
[<c02f9f04>] schedule_timeout+0xb4/0xc0
[<c02ef86e>] unix_wait_for_peer+0xbe/0xd0
[<c02f028a>] unix_dgram_sendmsg+0x26a/0x500
[<c0293cab>] sock_sendmsg+0xbb/0xe0
[<c0295161>] sys_sendto+0xe1/0x100
[<c02951b2>] sys_send+0x32/0x40
[<c0295a1a>] sys_socketcall+0x13a/0x250
[<c0104383>] syscall_call+0x7/0xb
cron S C1205F60 0 2628 435 2640 2614 (NOTLB)
cc738c9c 00000086 c8c5e930 c1205f60 c82e1b7c c4dba73c cc738c94 00000000
c4dba700 00000007 cc738cac cebb0690 c1205f60 00289ad9 af39036a 0003d2be
c8c5ea90 cf9aed40 7fffffff 00000001 cc738cd8 c02f9f04 00000246 000000d0
Call Trace:
[<c02f9f04>] schedule_timeout+0xb4/0xc0
[<c02ef86e>] unix_wait_for_peer+0xbe/0xd0
[<c02f028a>] unix_dgram_sendmsg+0x26a/0x500
[<c0293cab>] sock_sendmsg+0xbb/0xe0
[<c0295161>] sys_sendto+0xe1/0x100
[<c02951b2>] sys_send+0x32/0x40
[<c0295a1a>] sys_socketcall+0x13a/0x250
[<c0104383>] syscall_call+0x7/0xb

cron S C1205F60 0 2640 435 2655 2628 (NOTLB)
c2bfbc9c 00000082 c721b9d0 c1205f60 cd21db7c c4dba07c c2bfbc94 00000000
c4dba040 00000007 cf06b200 cebb0690 c1205f60 0027ced4 87b993a6 0003d304
c721bb30 cf9aed40 7fffffff 00000001 c2bfbcd8 c02f9f04 c138f6c0 c9bdea4c
Call Trace:
[<c02f9f04>] schedule_timeout+0xb4/0xc0
[<c02ef86e>] unix_wait_for_peer+0xbe/0xd0
[<c02f028a>] unix_dgram_sendmsg+0x26a/0x500
[<c0293cab>] sock_sendmsg+0xbb/0xe0
[<c0295161>] sys_sendto+0xe1/0x100
[<c02951b2>] sys_send+0x32/0x40
[<c0295a1a>] sys_socketcall+0x13a/0x250
[<c0104383>] syscall_call+0x7/0xb
sshd S C1205F60 0 2653 1410 2654 17528 (NOTLB)
c163dc9c 00000086 c721b470 c1205f60 00000000 00000000 00000000 00000000
c4dba4c0 00000007 cf06b560 c721af10 c1205f60 00039ddd 67910d34 0003d32a
c721b5d0 cf9aed40 7fffffff 00000001 c163dcd8 c02f9f04 c138f6c0 c9bdea4c
Call Trace:
[<c02f9f04>] schedule_timeout+0xb4/0xc0
[<c02ef86e>] unix_wait_for_peer+0xbe/0xd0
[<c02f028a>] unix_dgram_sendmsg+0x26a/0x500
[<c0293cab>] sock_sendmsg+0xbb/0xe0
[<c0295161>] sys_sendto+0xe1/0x100
[<c02951b2>] sys_send+0x32/0x40
[<c0295a1a>] sys_socketcall+0x13a/0x250
[<c0104383>] syscall_call+0x7/0xb





-Chris
-
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