linux-kernel - Re: 2.6.35-rc3 deadlocks on semaphore operations

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Date:	Mon, 21 Jun 2010 12:05:36 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Manfred Spraul <manfred@...orfullife.com>
cc:	linux-kernel@...r.kernel.org, Julia Lawall <julia@...u.dk>
Subject: Re: 2.6.35-rc3 deadlocks on semaphore operations

On Sat, 19 Jun 2010, Manfred Spraul wrote:

> What are the semaphore values?
>
> Could you run
> $ ipcs
linux-2.6$ ipcs

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status
0x00000000 0          root       777        135168     0
0x00000000 163841     root       777        135168     2
0x00000000 327682     christoph  600        393216     2          dest
0x00000000 360451     christoph  600        393216     2          dest
0x00000000 393220     christoph  600        393216     2          dest
0x00000000 425989     christoph  600        393216     2          dest
0x00000000 458758     christoph  600        393216     2          dest
0x00000000 491527     christoph  600        393216     2          dest
0x00000000 524296     christoph  600        393216     2          dest
0x00000000 557065     christoph  600        393216     2          dest
0x00000000 589834     christoph  600        393216     2          dest
0x00000000 622603     christoph  600        393216     2          dest
0x00000000 655372     christoph  600        393216     2          dest
0x00000000 688141     christoph  600        393216     2          dest
0x00000000 720910     christoph  600        393216     2          dest
0x00000000 753679     christoph  600        393216     2          dest
0x00000000 786448     christoph  600        4          2          dest
0xcbc384f8 819217     christoph  600        64528      1
0x00000000 851986     christoph  600        4          2          dest
0x00000000 884755     christoph  600        4          2          dest
0x00000000 917524     christoph  600        393216     2          dest
0x00000000 950293     christoph  600        393216     2          dest
0x00000000 5537814    christoph  666        31620      3          dest
0x00000000 5275672    christoph  666        376320     1          dest
0x00000000 5341209    christoph  666        376320     2          dest

------ Semaphore Arrays --------
key        semid      owner      perms      nsems
0x5e8387d1 65536      christoph  600        1
0xcbc384f8 32769      christoph  600        1

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages
0x5e8387cf 65536      christoph  600        0            0
0x5e8387d0 98305      christoph  600        0            0

> $ cat /proc/sysvipc/sem

linux-2.6$ cat /proc/sysvipc/sem
       key      semid perms      nsems   uid   gid  cuid  cgid      otime      ctime
1585678289      65536   600          1  1000  1000  1000  1000 1277138991 1277138892
-876378888      32769   600          1  1000  1000  1000  1000 1277139467 1277138069


> $ ./getall 32768 -v
>
> getall is attached.

linux-2.6$ ~/getall 65536 -v
getall <id> [-v]
found 1 semaphores.
   0:   0 (cnt  10 zcnt   0)

linux-2.6$ ~/getall 32769 -v
getall <id> [-v]
found 1 semaphores.
   0:   1 (cnt   0 zcnt   0)

The process is "dash". Could have something to do with "fakeroot"

christoph@...HITW00139:/proc/27878$ cat maps
00400000-00418000 r-xp 00000000 08:21 253992                             /bin/dash
00617000-00618000 r--p 00017000 08:21 253992                             /bin/dash
00618000-00619000 rw-p 00018000 08:21 253992                             /bin/dash
00619000-0061c000 rw-p 00000000 00:00 0
024b6000-024d7000 rw-p 00000000 00:00 0                                  [heap]
2b03c4959000-2b03c4979000 r-xp 00000000 08:21 6259766                    /lib/ld-2.11.1.so
2b03c4979000-2b03c497b000 rw-p 00000000 00:00 0
2b03c4b79000-2b03c4b7a000 r--p 00020000 08:21 6259766                    /lib/ld-2.11.1.so
2b03c4b7a000-2b03c4b7b000 rw-p 00021000 08:21 6259766                    /lib/ld-2.11.1.so
2b03c4b7b000-2b03c4b7c000 rw-p 00000000 00:00 0
2b03c4b7c000-2b03c4b85000 r-xp 00000000 08:21 5447953                    /usr/lib/libfakeroot/libfakeroot-sysv.so
2b03c4b85000-2b03c4d84000 ---p 00009000 08:21 5447953                    /usr/lib/libfakeroot/libfakeroot-sysv.so
2b03c4d84000-2b03c4d85000 r--p 00008000 08:21 5447953                    /usr/lib/libfakeroot/libfakeroot-sysv.so
2b03c4d85000-2b03c4d86000 rw-p 00009000 08:21 5447953                    /usr/lib/libfakeroot/libfakeroot-sysv.so
2b03c4da4000-2b03c4f1c000 r-xp 00000000 08:21 6260729                    /lib/libc-2.11.1.so
2b03c4f1c000-2b03c511c000 ---p 00178000 08:21 6260729                    /lib/libc-2.11.1.so
2b03c511c000-2b03c5120000 r--p 00178000 08:21 6260729                    /lib/libc-2.11.1.so
2b03c5120000-2b03c5121000 rw-p 0017c000 08:21 6260729                    /lib/libc-2.11.1.so
2b03c5121000-2b03c5127000 rw-p 00000000 00:00 0
2b03c5127000-2b03c5129000 r-xp 00000000 08:21 6260732                    /lib/libdl-2.11.1.so
2b03c5129000-2b03c5329000 ---p 00002000 08:21 6260732                    /lib/libdl-2.11.1.so
2b03c5329000-2b03c532a000 r--p 00002000 08:21 6260732                    /lib/libdl-2.11.1.so
2b03c532a000-2b03c532b000 rw-p 00003000 08:21 6260732                    /lib/libdl-2.11.1.so
2b03c532b000-2b03c532d000 rw-p 00000000 00:00 0
7fff258b3000-7fff258d5000 rw-p 00000000 00:00 0                          [stack]
7fff2598f000-7fff25990000 r-xp 00000000 00:00 0                          [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]



View attachment "getall.c" of type "TEXT/PLAIN" (1823 bytes)