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    SubjectRe: deadlock with 2.6.9
    I had another deadlock after the completion of a dvd writing session last 
    night. The dvd was written using the ide interface with growisof.

    sysrq+p, sysrq+m, and a partial sysrq+t are at
    http://hashbrown.cts.ucla.edu/deadlock/sysrq+t-20041104.

    Virtually everything is stuck in schedule_timeout+0xb4/0xc0. It looks
    very similar to the last deadlock I had (sysrq+t output is in the same
    directory as the above as sysrq+t-20041101).

    cbs:~ > lsmod
    Module Size Used by
    ide_cd 39328 0
    cdrom 38460 1 ide_cd
    e100 29760 0
    bonding 64552 0

    Any ideas? Anything in particular to check?


    -Chris

    On Mon, 1 Nov 2004, Chris Stromsoe wrote:

    > 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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