Re: jfs_fsck segfaults

On Wed, 2 Sep 2015, Jernej Simončič wrote:
> On Saturday, August 29, 2015, 11:24:58, Christian Kujau wrote:
> 
> > If you still have the partition image - can you try running jfs_fsck on
> > that image on another system? Maybe the segfault got triggered by a memory
> > error?
> 
> I just tried booting SystemRescueCD 4.5.2 in VMWare on my workstation,
> and attached a copy of the partition image with the loop driver there.
> jfs_fsck still segfaulted:

Thanks for the GDB output - unfortunately I'm not able to tell what went 
wrong here. Maybe Dave (Cc'ed) can read the GDB output?

Also, you wouldn't be able to share the disk image, no?

Christian.

> ,-----
> | % jfs_fsck -v -a -p /dev/loop1
> | jfs_fsck version 1.1.15, 04-Mar-2011
> | processing started: 9/2/2015 19:51:47
> | The current device is:  /dev/loop1
> | Open(...READ/WRITE EXCLUSIVE...) returned rc = 0
> | Primary superblock is valid.
> | The type of file system for the device is JFS.
> | Block size in bytes:  4096
> | Filesystem size in blocks:  2097152
> | **Phase 0 - Replay Journal Log
> | LOGREDO:  Log record for Sync Point at:    0x011f85e4
> | LOGREDO:  Beginning to update the Inode Allocation Map.
> | zsh: segmentation fault  jfs_fsck -v -a -p /dev/loop1
> `-----
> 
> My server is based on SuperMicro X8DT3 board with Xeon E5620 and ECC
> reg. RAM, so undetected memory errors should be fairly unlikely.
> 
> > Does "gdb" on the core file reveal anything interesting? E.g.
> >  gdb -c ./core /usr/sbin/jfs_fsck -ex bt
> 
> Unfortunately not, seems like there's no debug symbols. Instead I
> checked out the latest jfsutils sources, and compiled that with -g
> -ggdb, here's what happens when I run jfs_fsck in gdb:
> 
> # gdb --args ./jfs_fsck -a -p -v /dev/loop18
> GNU gdb (Gentoo 7.9.1 vanilla) 7.9.1
> Copyright (C) 2015 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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> and "show warranty" for details.
> This GDB was configured as "x86_64-pc-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
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> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from ./jfs_fsck...done.
> (gdb) r
> Starting program: /root/pkg/jfs/jfsutils/fsck/jfs_fsck -a -p -v /dev/loop18
> /root/pkg/jfs/jfsutils/fsck/jfs_fsck version 1.1.15, Sep  2 2015
> processing started: 9/2/2015 20:57:20
> The current device is:  /dev/loop18
> Open(...READ/WRITE EXCLUSIVE...) returned rc = 0
> Primary superblock is valid.
> The type of file system for the device is JFS.
> Block size in bytes:  4096
> Filesystem size in blocks:  2097152
> **Phase 0 - Replay Journal Log
> LOGREDO:  Log record for Sync Point at:    0x011f85e4
> LOGREDO:  Beginning to update the Inode Allocation Map.
> Correcting Inode Allocation Group F-585027579 invalid Allocation Group (29366).
> 
> Program received signal SIGSEGV, Segmentation fault.
> iMapRead (vol=0, page_number=382326830, page_buffer=0x72b000) at log_map.c:814
> 814             imr_rc = ujfs_rw_diskblocks(vopen[vol].fp,
> (gdb) bt f
> #0  iMapRead (vol=0, page_number=382326830, page_buffer=0x72b000) at log_map.c:814
>         imr_rc = 0
> #1  0x000000000043ec7c in writeImap (vol=0, fsimap=..., dp=0x6d2980 <buffer+352256>) at log_map.c:1090
>         imap_ctl = 0x729000
>         rc = 0
>         k = 100
>         iagpages = 147
>         npages = 148
>         next_iag = 382326829
>         iagfree = 0
>         numinos = 4096
>         agno = 0
>         iagp = 0x72a000
>         iag_pg = 0x72b000
>         next_imap_page = 102
>         iag_datarec = 0x732a00
>         maplen = 1024
>         inoext_arrlen = 1024
> #2  0x000000000043e795 in updateMaps (vol=0) at log_map.c:940
>         rc = 0
>         dip = 0x6d2980 <buffer+352256>
>         pxd1 = {len = 1, addr1 = 0, addr2 = 13}
> #3  0x0000000000436348 in jfs_logredo (pathname=0x7fffffffd976 "/dev/loop18", fp=0x71d780, use_2nd_aggSuper=0) at logredo.c:786
>         rc = 0
>         k = 0
>         logaddr = 18816552
>         nextaddr = 18816496
>         lastaddr = 18816552
>         nlogrecords = 4257
>         syncrecord = 18843108
>         ld = {logtid = 2569532, backchain = 18816496, type = 8, length = 20, aggregate = 0, log = {redopage = {fileset = 16, inode = 172077, type = 8, l2linesize = 1, pxd = {len = 1, addr1 = 0,
>                 addr2 = 720921}}, noredopage = {fileset = 16, inode = 172077, type = 8, rsrvd = 1, pxd = {len = 1, addr1 = 0, addr2 = 720921}}, updatemap = {fileset = 16, inode = 172077, type = 8, nxd = 1,
>               pxd = {len = 1, addr1 = 0, addr2 = 720921}}, noredoinoext = {fileset = 16, iagnum = 172077, inoext_idx = 65544, pxd = {len = 1, addr1 = 0, addr2 = 720921}}, syncpt = {sync = 16}, freextent = {
>               type = 16, nextent = 172077}, noredofile = {fileset = 16, inode = 172077}, newpage = {fileset = 16, inode = 172077, type = 65544, pxd = {len = 1, addr1 = 0, addr2 = 720921}}}}
>         lowest_lr_byte = 8200
>         highest_lr_byte = 33554396
>         log_has_wrapped = 0
>         logend = 19296148
>         in_use = 0
> #4  0x00000000004315ad in phase0_processing () at xchkdsk.c:1888
>         p0_rc = 0
>         agg_blks = 2097152
>         use_2ndary_superblock = 0
> #5  0x000000000042e723 in main (argc=5, argv=0x7fffffffd608) at xchkdsk.c:333
>         rc = 0
>         Current_Time = 140737488344576
> (gdb)
> 
> Hopefully this helps.
> 
> -- 
> < Jernej Simončič ><><><><>< http://eternallybored.org/ >
> 
> A memorandum is written not to inform the reader but to protect the writer.
>        -- Acheson's Rule of the Bureaucracy
> 
> 
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-- 
BOFH excuse #175:

OS swapped to disk

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