From: Marc MERLIN <marc@merlins.org>
To: linux-btrfs@vger.kernel.org
Subject: btrfs race conditions on snapshot delete/create
Date: Fri, 27 Sep 2013 16:45:50 -0700 [thread overview]
Message-ID: <20130927234550.GJ22921@merlins.org> (raw)
I had a cronjob that mistakenly created and deleted snapshots in the same
place at the same time.
Interesting output I got:
/var/local/scr/btrfs_snaps: line 23: 26017 Segmentation fault (core dumped) /sbin/btrfs subvolume delete "$sub"
On ubuntu precise (i.e. super ancient), but I upgraded userland:
polgara:~$ btrfs --version
Btrfs v0.20-rc1
Kernel 3.2.5.
Sorry, aptport stole my crashes and apparently didn't give a backtrace, but
that's what I have if this helps:
ProblemType: Crash
Architecture: amd64
Date: Thu Sep 26 22:00:03 2013
DistroRelease: Ubuntu 12.04
ExecutablePath: /sbin/btrfs
ExecutableTimestamp: 1380251279
ProcCmdline: /sbin/btrfs subvolume delete google_hourly_20130926_19:00:01
ProcCwd: /mnt/btrfs_pool1
ProcEnviron:
SHELL=/bin/sh
PATH=(custom, no user)
ProcMaps:
00400000-00442000 r-xp 00000000 fc:00 399893 /sbin/btrfs
00641000-00643000 r--p 00041000 fc:00 399893 /sbin/btrfs
00643000-00644000 rw-p 00043000 fc:00 399893 /sbin/btrfs
00644000-00646000 rw-p 00000000 00:00 0
01b05000-01b26000 rw-p 00000000 00:00 0 [heap]
7fb153b8e000-7fb153d43000 r-xp 00000000 fc:00 2232563 /lib/x86_64-linux-gnu/libc-2.15.so
7fb153d43000-7fb153f42000 ---p 001b5000 fc:00 2232563 /lib/x86_64-linux-gnu/libc-2.15.so
7fb153f42000-7fb153f46000 r--p 001b4000 fc:00 2232563 /lib/x86_64-linux-gnu/libc-2.15.so
7fb153f46000-7fb153f48000 rw-p 001b8000 fc:00 2232563 /lib/x86_64-linux-gnu/libc-2.15.so
7fb153f48000-7fb153f4d000 rw-p 00000000 00:00 0
7fb153f4d000-7fb153f65000 r-xp 00000000 fc:00 2233530 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fb153f65000-7fb154164000 ---p 00018000 fc:00 2233530 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fb154164000-7fb154165000 r--p 00017000 fc:00 2233530 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fb154165000-7fb154166000 rw-p 00018000 fc:00 2233530 /lib/x86_64-linux-gnu/libpthread-2.15.so
7fb154166000-7fb15416a000 rw-p 00000000 00:00 0
7fb15416a000-7fb15416d000 r-xp 00000000 fc:00 2228482 /lib/x86_64-linux-gnu/libcom_err.so.2.1
7fb15416d000-7fb15436c000 ---p 00003000 fc:00 2228482 /lib/x86_64-linux-gnu/libcom_err.so.2.1
7fb15436c000-7fb15436d000 r--p 00002000 fc:00 2228482 /lib/x86_64-linux-gnu/libcom_err.so.2.1
7fb15436d000-7fb15436e000 rw-p 00003000 fc:00 2228482 /lib/x86_64-linux-gnu/libcom_err.so.2.1
7fb15436e000-7fb15438e000 r-xp 00000000 fc:00 2232137 /lib/liblzo2.so.2
7fb15438e000-7fb15458d000 ---p 00020000 fc:00 2232137 /lib/liblzo2.so.2
7fb15458d000-7fb15458e000 rw-p 0001f000 fc:00 2232137 /lib/liblzo2.so.2
7fb15458e000-7fb1545a4000 r-xp 00000000 fc:00 2228617 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7fb1545a4000-7fb1547a3000 ---p 00016000 fc:00 2228617 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7fb1547a3000-7fb1547a4000 r--p 00015000 fc:00 2228617 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7fb1547a4000-7fb1547a5000 rw-p 00016000 fc:00 2228617 /lib/x86_64-linux-gnu/libz.so.1.2.3.4
7fb1547a5000-7fb1548a0000 r-xp 00000000 fc:00 2256906 /lib/x86_64-linux-gnu/libm-2.15.so
7fb1548a0000-7fb154a9f000 ---p 000fb000 fc:00 2256906 /lib/x86_64-linux-gnu/libm-2.15.so
7fb154a9f000-7fb154aa0000 r--p 000fa000 fc:00 2256906 /lib/x86_64-linux-gnu/libm-2.15.so
7fb154aa0000-7fb154aa1000 rw-p 000fb000 fc:00 2256906 /lib/x86_64-linux-gnu/libm-2.15.so
7fb154aa1000-7fb154ac3000 r-xp 00000000 fc:00 2228442 /lib/x86_64-linux-gnu/libblkid.so.1.1.0
7fb154ac3000-7fb154cc3000 ---p 00022000 fc:00 2228442 /lib/x86_64-linux-gnu/libblkid.so.1.1.0
7fb154cc3000-7fb154cc6000 r--p 00022000 fc:00 2228442 /lib/x86_64-linux-gnu/libblkid.so.1.1.0
7fb154cc6000-7fb154cc7000 rw-p 00025000 fc:00 2228442 /lib/x86_64-linux-gnu/libblkid.so.1.1.0
7fb154cc7000-7fb154ccb000 r-xp 00000000 fc:00 2228602 /lib/x86_64-linux-gnu/libuuid.so.1.3.0
7fb154ccb000-7fb154eca000 ---p 00004000 fc:00 2228602 /lib/x86_64-linux-gnu/libuuid.so.1.3.0
7fb154eca000-7fb154ecb000 r--p 00003000 fc:00 2228602 /lib/x86_64-linux-gnu/libuuid.so.1.3.0
7fb154ecb000-7fb154ecc000 rw-p 00004000 fc:00 2228602 /lib/x86_64-linux-gnu/libuuid.so.1.3.0
7fb154ecc000-7fb154eee000 r-xp 00000000 fc:00 2256912 /lib/x86_64-linux-gnu/ld-2.15.so
7fb1550c6000-7fb1550cb000 rw-p 00000000 00:00 0
7fb1550ec000-7fb1550ee000 rw-p 00000000 00:00 0
7fb1550ee000-7fb1550ef000 r--p 00022000 fc:00 2256912 /lib/x86_64-linux-gnu/ld-2.15.so
7fb1550ef000-7fb1550f1000 rw-p 00023000 fc:00 2256912 /lib/x86_64-linux-gnu/ld-2.15.so
7fffe703f000-7fffe7060000 rw-p 00000000 00:00 0 [stack]
7fffe70df000-7fffe70e0000 r-xp 00000000 00:00 0 [vdso]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]
ProcStatus:
Name: btrfs
State: S (sleeping)
Tgid: 31926
Pid: 31926
PPid: 31856
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
FDSize: 256
Groups: 0 128 71252
VmPeak: 20440 kB
VmSize: 20436 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 824 kB
VmRSS: 824 kB
VmData: 208 kB
VmStk: 136 kB
VmExe: 264 kB
VmLib: 3364 kB
VmPTE: 64 kB
VmSwap: 0 kB
Threads: 1
SigQ: 8/514713
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000000000
SigCgt: 0000000180000000
CapInh: 0000000000000000
CapPrm: ffffffffffffffff
CapEff: ffffffffffffffff
CapBnd: ffffffffffffffff
Cpus_allowed: ffffffff
Cpus_allowed_list: 0-31
Mems_allowed: 00000000,00000003
Mems_allowed_list: 0-1
voluntary_ctxt_switches: 3
nonvoluntary_ctxt_switches: 1
Signal: 11
Uname: Linux 3.2.5-gg1336 x86_64
UserGroups: pkcs11 root root
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
reply other threads:[~2013-09-27 23:45 UTC|newest]
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