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xfs_repair segfaults with ag_stride option

To: <xfs@xxxxxxxxxxx>
Subject: xfs_repair segfaults with ag_stride option
From: Tom Crane <T.Crane@xxxxxxxxxx>
Date: Wed, 1 Feb 2012 13:36:12 +0000
Cc: <T.Crane@xxxxxxxxxx>
User-agent: Thunderbird (X11/20111109)
Dear XFS Support,
I am attempting to use xfs_repair to fix a damaged FS but always get a segfault if and only if -o ag_stride is specified. I have tried ag_stride=2,8,16 & 32. The FS is approx 60T. I can't find reports of this particular problem on the mailing list archive. Further details are;

xfs_repair version 3.1.7, recently downloaded via git repository.
uname -a
Linux store3 2.6.18-274.17.1.el5 #1 SMP Wed Jan 11 11:10:32 CET 2012 x86_64 x86_64 x86_64 GNU/Linux

Running with -P and/or -m 9000 did not help. The host has 10GB memory. I built xfs_repair with './configure CFLAGS="-g -O2" && make' Here is the log from a gdb session. Is there any other information/tests that I can supply?

Please help.
Many thanks
Tom Crane

[root@store3 tcrane]# gdb xfsprogs/repair/xfs_repair
GNU gdb (GDB) Red Hat Enterprise Linux (7.0.1-37.el5_7.1)
Copyright (C) 2009 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-redhat-linux-gnu".
For bug reporting instructions, please see:
Reading symbols from /data/tcrane/xfsprogs/repair/xfs_repair...done.
(gdb) set arg -n -m 9000 -o ag_stride=2 /dev/mapper/vg0-lvol0
(gdb) ru
Starting program: /data/tcrane/xfsprogs/repair/xfs_repair -n -m 9000 -o ag_stride=2 /dev/mapper/vg0-lvol0 warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000
[Thread debugging using libthread_db enabled]
Phase 1 - find and verify superblock...
[New Thread 0x40a00940 (LWP 12803)]
        - reporting progress in intervals of 15 minutes
Phase 2 - using internal log
        - scan filesystem freespace and inode maps...
[New Thread 0x41401940 (LWP 12804)]
[New Thread 0x41e02940 (LWP 12805)]
[New Thread 0x42803940 (LWP 12806)]
[New Thread 0x43204940 (LWP 12807)]
[New Thread 0x43c05940 (LWP 12808)]
[New Thread 0x44606940 (LWP 12809)]
[New Thread 0x45007940 (LWP 12810)]
[New Thread 0x45a08940 (LWP 12811)]
[New Thread 0x46409940 (LWP 12812)]
[New Thread 0x46e0a940 (LWP 12813)]
[New Thread 0x4780b940 (LWP 12814)]
[New Thread 0x4820c940 (LWP 12815)]
[New Thread 0x48c0d940 (LWP 12816)]
[New Thread 0x4960e940 (LWP 12817)]
[New Thread 0x4a00f940 (LWP 12818)]
[New Thread 0x4aa10940 (LWP 12819)]
[New Thread 0x4b411940 (LWP 12820)]
[New Thread 0x4be12940 (LWP 12821)]
[New Thread 0x4c813940 (LWP 12822)]
[New Thread 0x4d214940 (LWP 12823)]
[New Thread 0x4dc15940 (LWP 12824)]
[New Thread 0x4e616940 (LWP 12825)]
[New Thread 0x4f017940 (LWP 12826)]
[New Thread 0x4fa18940 (LWP 12827)]
[New Thread 0x50419940 (LWP 12828)]
[New Thread 0x50e1a940 (LWP 12829)]
[New Thread 0x5181b940 (LWP 12830)]
[New Thread 0x5221c940 (LWP 12831)]
[New Thread 0x52c1d940 (LWP 12832)]
[New Thread 0x5361e940 (LWP 12833)]
[New Thread 0x5401f940 (LWP 12834)]
[New Thread 0x54a20940 (LWP 12835)]
[Thread 0x4820c940 (LWP 12815) exited]
[Thread 0x4f017940 (LWP 12826) exited]
[Thread 0x5401f940 (LWP 12834) exited]
[Thread 0x54a20940 (LWP 12835) exited]
[Thread 0x48c0d940 (LWP 12816) exited]
[Thread 0x46409940 (LWP 12812) exited]
[Thread 0x4780b940 (LWP 12814) exited]
[Thread 0x46e0a940 (LWP 12813) exited]
[Thread 0x44606940 (LWP 12809) exited]
[Thread 0x5361e940 (LWP 12833) exited]
[Thread 0x50e1a940 (LWP 12829) exited]
[Thread 0x45a08940 (LWP 12811) exited]
[Thread 0x52c1d940 (LWP 12832) exited]
[Thread 0x4c813940 (LWP 12822) exited]
[Thread 0x41401940 (LWP 12804) exited]
[Thread 0x5221c940 (LWP 12831) exited]
[Thread 0x4fa18940 (LWP 12827) exited]
[Thread 0x4be12940 (LWP 12821) exited]
[Thread 0x4a00f940 (LWP 12818) exited]
[Thread 0x43204940 (LWP 12807) exited]
[Thread 0x5181b940 (LWP 12830) exited]
[Thread 0x4b411940 (LWP 12820) exited]
[Thread 0x4e616940 (LWP 12825) exited]
[Thread 0x41e02940 (LWP 12805) exited]
[Thread 0x4dc15940 (LWP 12824) exited]
[Thread 0x50419940 (LWP 12828) exited]
[Thread 0x42803940 (LWP 12806) exited]
[Thread 0x4d214940 (LWP 12823) exited]
[Thread 0x4aa10940 (LWP 12819) exited]
[Thread 0x43c05940 (LWP 12808) exited]
[Thread 0x45007940 (LWP 12810) exited]
[Thread 0x4960e940 (LWP 12817) exited]
- 12:58:56: scanning filesystem freespace - 59 of 59 allocation groups done
        - found root inode chunk
Phase 3 - for each AG...
        - scan (but don't clear) agi unlinked lists...
- 12:58:56: scanning agi unlinked lists - 59 of 59 allocation groups done
        - process known inodes and perform inode discovery...
[New Thread 0x54a20940 (LWP 12837)]
[New Thread 0x5401f940 (LWP 12838)]
[New Thread 0x41401940 (LWP 12840)]
[New Thread 0x5361e940 (LWP 12839)]
[New Thread 0x41e02940 (LWP 12841)]
[New Thread 0x42803940 (LWP 12842)]
[New Thread 0x43c05940 (LWP 12844)]
[New Thread 0x43204940 (LWP 12843)]
[New Thread 0x44606940 (LWP 12845)]
[New Thread 0x46409940 (LWP 12849)]
[New Thread 0x46e0a940 (LWP 12850)]
[New Thread 0x45a08940 (LWP 12848)]
[New Thread 0x45007940 (LWP 12847)]
[New Thread 0x4780b940 (LWP 12851)]
[New Thread 0x48c0d940 (LWP 12853)]
[New Thread 0x4820c940 (LWP 12852)]
[New Thread 0x4a00f940 (LWP 12856)]
[New Thread 0x4960e940 (LWP 12855)]
        - agno = 0
[New Thread 0x4aa10940 (LWP 12858)]
[New Thread 0x4b411940 (LWP 12857)]
[New Thread 0x4be12940 (LWP 12859)]
[New Thread 0x4c813940 (LWP 12861)]
[New Thread 0x4d214940 (LWP 12860)]
[New Thread 0x4dc15940 (LWP 12862)]
        - agno = 4
[New Thread 0x4f017940 (LWP 12864)]
[New Thread 0x4e616940 (LWP 12863)]
        - agno = 2
[Thread 0x4be12940 (LWP 12859) exited]
[New Thread 0x4fa18940 (LWP 12866)]
[Thread 0x43c05940 (LWP 12844) exited]
[New Thread 0x50419940 (LWP 12867)]
[Thread 0x46409940 (LWP 12849) exited]
[Thread 0x4820c940 (LWP 12852) exited]
[New Thread 0x43c05940 (LWP 12869)]
[New Thread 0x46409940 (LWP 12868)]
[Thread 0x4c813940 (LWP 12861) exited]
[Thread 0x4a00f940 (LWP 12856) exited]
[New Thread 0x5181b940 (LWP 12871)]
[New Thread 0x50e1a940 (LWP 12870)]
[New Thread 0x52c1d940 (LWP 12873)]
[Thread 0x46e0a940 (LWP 12850) exited]
[New Thread 0x5221c940 (LWP 12872)]
        - agno = 6
[Thread 0x4dc15940 (LWP 12862) exited]
[Thread 0x5221c940 (LWP 12872) exited]
[New Thread 0x55421940 (LWP 12875)]
[Thread 0x4b411940 (LWP 12857) exited]
[Thread 0x50419940 (LWP 12867) exited]
[New Thread 0x4be12940 (LWP 12876)]
[Thread 0x4960e940 (LWP 12855) exited]
[New Thread 0x50419940 (LWP 12878)]
[New Thread 0x5221c940 (LWP 12877)]
[New Thread 0x4c813940 (LWP 12879)]
        - agno = 10
[Thread 0x50419940 (LWP 12878) exited]
[New Thread 0x55e22940 (LWP 12883)]
[New Thread 0x4dc15940 (LWP 12882)]
[Thread 0x42803940 (LWP 12842) exited]
[New Thread 0x56823940 (LWP 12884)]
[New Thread 0x4960e940 (LWP 12881)]
[Thread 0x52c1d940 (LWP 12873) exited]
[Thread 0x43c05940 (LWP 12869) exited]
[New Thread 0x42803940 (LWP 12886)]
[New Thread 0x43c05940 (LWP 12885)]
[New Thread 0x57224940 (LWP 12887)]
        - agno = 8
[Thread 0x50e1a940 (LWP 12870) exited]
[Thread 0x44606940 (LWP 12845) exited]
[New Thread 0x50419940 (LWP 12888)]
[New Thread 0x52c1d940 (LWP 12889)]
[Thread 0x55e22940 (LWP 12883) exited]
[New Thread 0x50e1a940 (LWP 12891)]
[New Thread 0x44606940 (LWP 12890)]
[Thread 0x5221c940 (LWP 12877) exited]
[Thread 0x4f017940 (LWP 12864) exited]
[New Thread 0x57c25940 (LWP 12893)]
        - agno = 3
[Thread 0x50e1a940 (LWP 12891) exited]
[Thread 0x4fa18940 (LWP 12866) exited]
[New Thread 0x4f017940 (LWP 12894)]
[New Thread 0x58626940 (LWP 12895)]
[Thread 0x52c1d940 (LWP 12889) exited]
[New Thread 0x4fa18940 (LWP 12896)]
[New Thread 0x59027940 (LWP 12897)]
[New Thread 0x59a28940 (LWP 12898)]
[Thread 0x4dc15940 (LWP 12882) exited]
[New Thread 0x5a429940 (LWP 12899)]
[New Thread 0x4dc15940 (LWP 12900)]
[Thread 0x48c0d940 (LWP 12853) exited]
[New Thread 0x5ae2a940 (LWP 12901)]
        - agno = 5
[Thread 0x55421940 (LWP 12875) exited]
[New Thread 0x55e22940 (LWP 12902)]
[New Thread 0x5221c940 (LWP 12903)]
[Thread 0x5ae2a940 (LWP 12901) exited]
[Thread 0x59a28940 (LWP 12898) exited]
[Thread 0x43c05940 (LWP 12885) exited]
[Thread 0x4f017940 (LWP 12894) exited]
[New Thread 0x5ae2a940 (LWP 12904)]
[Thread 0x56823940 (LWP 12884) exited]
        - agno = 11
        - agno = 12
[Thread 0x4c813940 (LWP 12879) exited]
[New Thread 0x59a28940 (LWP 12932)]
[Thread 0x5a429940 (LWP 12899) exited]
[Thread 0x5221c940 (LWP 12903) exited]
[New Thread 0x4c813940 (LWP 12933)]
[Thread 0x5ae2a940 (LWP 12904) exited]
[Thread 0x59027940 (LWP 12897) exited]
[Thread 0x4fa18940 (LWP 12896) exited]
[Thread 0x58626940 (LWP 12895) exited]
[New Thread 0x50e1a940 (LWP 12952)]
[Thread 0x50419940 (LWP 12888) exited]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x54a20940 (LWP 12837)]
0x000000380ac7b29f in memset () from /lib64/libc.so.6
(gdb) bt
#0  0x000000380ac7b29f in memset () from /lib64/libc.so.6
#1 0x0000000000403998 in process_leaf_attr_block (mp=0x7fffffffe560, leaf=0x2aab2bfb4400, da_bno=0, ino=1718, blkmap=0x2aab280787d0, last_hashval=0,
    current_hashval=0x54a1fd44, repair=0x54a1fdc4) at attr_repair.c:522
#2 0x000000000040494b in process_longform_attr (mp=0x7fffffffe560, ino=1718, dip=0x18e4e00, blkmap=0x2aab280787d0, repair=0x54a1fdc4)
    at attr_repair.c:900
#3 0x000000000040d971 in process_inode_attr_fork (mp=0x7fffffffe560, agno=0, ino=1718, dino=0x18e4e00, type=5, dirty=0x54a1ffe0, atotblocks=0x54a1fe70, anextents=0x54a1fe60, check_dups=0, extra_attr_check=1, retval=0x54a1fe80) at dinode.c:2301 #4 0x000000000040f368 in process_dinode_int (mp=0x7fffffffe560, dino=0x18e4e00, agno=0, ino=1718, was_free=0, dirty=0x54a1ffe0, used=0x54a1ffe4, verify_mode=0, uncertain=0, ino_discovery=1, check_dups=0, extra_attr_check=1, isa_dir=0x54a1ffdc, parent=0x54a1ffd0) at dinode.c:2764 #5 0x000000000040fd0e in process_dinode (mp=0x0, dino=0x0, agno=0, ino=1024, was_free=8192, dirty=0x2000, used=0x54a1ffe4, ino_discovery=1, check_dups=0, extra_attr_check=1, isa_dir=0x54a1ffdc, parent=0x54a1ffd0) at dinode.c:2898 #6 0x0000000000409361 in process_inode_chunk (mp=0x7fffffffe560, agno=0, num_inos=<value optimized out>, first_irec=0x2aab283c9ef0, ino_discovery=1, check_dups=0, extra_attr_check=1, bogus=0x54a20064) at dino_chunks.c:779 #7 0x0000000000409a6c in process_aginodes (mp=0x7fffffffe560, pf_args=0x68ea10, agno=0, ino_discovery=1, check_dups=0, extra_attr_check=1)
    at dino_chunks.c:1018
#8 0x000000000041c8df in process_ag_func (wq=0x68fb50, agno=0, arg=0x68ea10) at phase3.c:154 #9 0x000000000042f86d in worker_thread (arg=<value optimized out>) at threads.c:46
#10 0x000000380b40673d in start_thread () from /lib64/libpthread.so.0
#11 0x000000380acd44bd in clone () from /lib64/libc.so.6
(gdb) list
522             * doesn't get flushed out if no_modify is set
523             */
524            mp->m_sb.sb_rsumino = first_prealloc_ino + 2;
525        }
526 527 } 528 529 int
530    main(int argc, char **argv)
531    {
(gdb) q

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