[Bug 969384] Re: mdadm --detail --scan segfaults during update-initramfs
Ubuntu Foundation's Bug Bot
969384 at bugs.launchpad.net
Sat Jun 9 20:18:06 UTC 2012
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** Tags added: patch
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https://bugs.launchpad.net/bugs/969384
Title:
mdadm --detail --scan segfaults during update-initramfs
Status in “mdadm” package in Ubuntu:
Confirmed
Bug description:
ubuntu precise, Installed version of mdadm is 3.2.3-2ubuntu1
mdadm segfaults on ubuntu precise during update-initramfs step. You
can reproduce it by running the command separately. Stealing an older
mdadm binary from an older ubuntu can be used as a workaround.
-------------------------
root at yow-lpgnfs-02:/home/paul# mdadm --detail --scan
Segmentation fault
root at yow-lpgnfs-02:/home/paul# dmesg
[ 577.478657] scsi_verify_blk_ioctl: 6 callbacks suppressed
[ 577.478661] mdadm: sending ioctl 1261 to a partition!
[ 577.478664] mdadm: sending ioctl 1261 to a partition!
[ 577.487510] mdadm: sending ioctl 1261 to a partition!
[ 577.487514] mdadm: sending ioctl 1261 to a partition!
[ 577.488595] mdadm: sending ioctl 1261 to a partition!
[ 577.488598] mdadm: sending ioctl 1261 to a partition!
[ 577.508385] mdadm: sending ioctl 1261 to a partition!
[ 577.508389] mdadm: sending ioctl 1261 to a partition!
[ 577.508680] mdadm: sending ioctl 1261 to a partition!
[ 577.508683] mdadm: sending ioctl 1261 to a partition!
[ 577.509875] mdadm[2244]: segfault at 0 ip 00007fc3b44bcb91 sp 00007fffca905c28 error 4 in libc-2.15.so[7fc3b4434000+1b2000]
----------------------------
Using old v3.1.4 is a workaround:
root at yow-lpgnfs-02:/home/paul# mdadm --version
mdadm - v3.2.3 - 23rd December 2011
root at yow-lpgnfs-02:/home/paul# /sbin/mdadm.old --version
mdadm - v3.1.4 - 31st August 2010
root at yow-lpgnfs-02:/home/paul# /sbin/mdadm.old --detail --scan
ARRAY /dev/md0 metadata=0.90 UUID=48165815:e3a4f8ba:63476e95:1b06b14d
root at yow-lpgnfs-02:/home/paul#
----------------------------------
root at yow-lpgnfs-02:/home/paul# gdb --args mdadm --detail --scan
GNU gdb (Ubuntu/Linaro 7.4-2012.02-0ubuntu2) 7.4-2012.02
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /sbin/mdadm...(no debugging symbols found)...done.
(gdb) run
Starting program: /sbin/mdadm --detail --scan
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7aa5b91 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ffff7aa5b91 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff7ae39c9 in fnmatch () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x0000000000409e88 in ?? ()
#3 0x000000000040a1b3 in ?? ()
#4 0x000000000044d10b in ?? ()
#5 0x000000000044d585 in ?? ()
#6 0x000000000044d67d in ?? ()
#7 0x0000000000407335 in ?? ()
#8 0x00007ffff7a3e76d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#9 0x0000000000407ee9 in ?? ()
#10 0x00007fffffffe668 in ?? ()
#11 0x000000000000001c in ?? ()
#12 0x0000000000000003 in ?? ()
#13 0x00007fffffffe8a8 in ?? ()
#14 0x00007fffffffe8b4 in ?? ()
#15 0x00007fffffffe8bd in ?? ()
#16 0x0000000000000000 in ?? ()
(gdb)
-------------------------------
Tail end of an strace:
open("/dev/sda1", O_RDONLY|O_DIRECT) = 3
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
ioctl(3, BLKGETSIZE64, 0x7fffc589fda0) = 0
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 250055622656, SEEK_SET) = 250055622656
read(3, "\374N+\251\0\0\0\0Z\0\0\0\0\0\0\0\0\0\0\0\25X\26H\332\374NN\0\0\0\0"..., 4096) = 4096
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
ioctl(3, BLKGETSIZE64, 0x7fffc589fc50) = 0
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 250055680000, SEEK_SET) = 250055680000
ioctl(3, BLKSSZGET, 0x7fffc589fc4c) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) = 1024
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
ioctl(3, BLKGETSIZE64, 0x7fffc589fc50) = 0
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 0, SEEK_SET) = 0
ioctl(3, BLKSSZGET, 0x7fffc589fc4c) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024) = 1024
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
ioctl(3, BLKGETSIZE64, 0x7fffc589fc50) = 0
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 4096, SEEK_SET) = 4096
ioctl(3, BLKSSZGET, 0x7fffc589fc4c) = 0
read(3, "\1\4\0\0\21\4\0\0!\4\0\0\331[\365\37\2\0\4\0\0\0\0\0\0\0\0\0\0\0E,"..., 1024) = 1024
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
ioctl(3, BLKGETSIZE64, 0x7fffc589fdb0) = 0
ioctl(3, BLKPG, 0x7fffc589fd10) = -1 EINVAL (Invalid argument)
ioctl(3, BLKPG, 0x7fffc589fd20) = -1 EINVAL (Invalid argument)
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 0, SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 0, SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
ioctl(3, BLKGETSIZE64, 0x7fffc589fda0) = 0
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 250055622656, SEEK_SET) = 250055622656
read(3, "\374N+\251\0\0\0\0Z\0\0\0\0\0\0\0\0\0\0\0\25X\26H\332\374NN\0\0\0\0"..., 4096) = 4096
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
ioctl(3, BLKGETSIZE64, 0x7fffc589ff80) = 0
ioctl(3, BLKFLSBUF, 0) = 0
lseek(3, 250055622656, SEEK_SET) = 250055622656
read(3, "\374N+\251\0\0\0\0Z\0\0\0\0\0\0\0\0\0\0\0\25X\26H\332\374NN\0\0\0\0"..., 4096) = 4096
close(3) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
-------------------------------------
root at yow-lpgnfs-02:/home/paul# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid0 sda1[0] sdb1[1]
488389888 blocks 64k chunks
unused devices: <none>
root at yow-lpgnfs-02:/home/paul# cat /proc/partitions
major minor #blocks name
8 0 293036184 sda
8 1 244195008 sda1
8 2 48837600 sda2
8 16 244198584 sdb
8 17 244195008 sdb1
9 0 488389888 md0
root at yow-lpgnfs-02:/home/paul#
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