Re: Re: EXT4 panic at jbd2_journal_put_journal_head() in 3.9+

[EUNBONG SONG]

> Can you give us the full crash message, (i.e., the panic, the BUG,
> WARN, the registers, etc.), and not the stack trace?

>                       - Ted

Hi, Ted
Actually i try to find the crash point. And i confirmed crash point is in __journal_remove_journal_head() function.
I added some debug code and i found  J_ASSERT_JH is failed for jh->b_transaction. 
My source tree has some modifications only for MIPS architecture. I don't think it does not affect to ext4 operation. 
Also I confirmed the problem is not reproduced before merge 149b306089b88e186942a8d6647028ae6683aaf9.

149b306089b88e186942a8d6647028ae6683aaf9 Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

My full crash messages are as follows.

Iozone: Performance Test of File I/O
                Version $Revision: 3.397 $
                Compiled for 64 bit mode.
                Build: linux-powerpc64

        Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
                     Al Slater, Scott Rhine, Mike Wisner, Ken Goss
                     Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
                     Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
                     Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,
                     Erik Habbinga, Kris Strecker, Walter Wong, Joshua Roo[  233.458766] CPU: 3 PID: 1535 Comm: iozone Not tainted 3.9.0+ #81
t,
                     Fabrice Bacchella, Zhenghua Xue, Qin Li, Darre[  233.470132] Stack :n Sawyer.
                     Ben England.

        Run began: Sun Dec 10  ffffffff8101143808:38:24 2000

        Record Size 64 KB
        File size set to 5120 KB
 a80000008b64b000       SYNC Mode.
        Command line used: iozone -l 20 -u 20 -r 64k -s 5 0000000000000003m -o -F /user/f1 /user/f2 /user/f3 /user/f4 /user/f5 /user/f6 /u ffffffff80292470ser/f7 /user/f8 /user/f9 /user/f10 /user/f11 /user/f12 /user/f13
          /user/f14 /user/f15 /user/f16 /user/f17 /user/f18 /user/f19 /us 0000000000000000er/f20
        Output is in Kbytes/sec
        Time Resolution = 0.000001 se ffffffff80fa0000conds.
        Processor cache size set to 1024 Kbytes.
        Processor ca 000000000000001fche line size set to 32 bytes.
        File stride size set to 17 * re ffffffff80293728cord size.
        Min process = 20
        Max process = 20
        Throughput
         test with 20 processes
        Each process writes a 5120 Kbyte file i 0000000000000000n 64 Kbyte records
 0000000000000000 ffffffff81080000 ffffffff81080000
          ffffffff80e2abf0 ffffffff80f8f9f7 a8000002017a0db8 0000000000000020
          0000000000000003 0000000000000020 a80000020025f968 ffffffff810f0000
          a80000020025f770 ffffffff806ee88c a80000020025f588 ffffffff80290994
          000000007ef10087 ffffffff80293b58 000000000000000a ffffffff80e2abf0
          0000000000000003 a80000020025f4b0 00000002017a10f8 ffffffff805e68b4
          0000000000000000 0000000000000000 0000000000000000 0000000000000000
          0000000000000000 ffffffff80272418 0000000000000000 0000000000000000
          ...
[  233.604041] Call Trace:
[  233.606495] [<ffffffff80272418>] show_stack+0x68/0x80
[  233.611550] [<ffffffff805e68b4>] cdr_event_handler+0x604/0xbf8
[  233.617384] [<ffffffff805e7648>] cdr_event_die+0xd0/0x150
[  233.622784] [<ffffffff802bd42c>] notifier_call_chain+0x5c/0xa8
[  233.628619] [<ffffffff802bdb04>] __atomic_notifier_call_chain+0x3c/0x58
[  233.635233] [<ffffffff802bdb68>] notify_die+0x38/0x48
[  233.640285] [<ffffffff80271c48>] do_trap_or_bp+0x48/0x1a8
[  233.645684] [<ffffffff8026c764>] resume_userspace_check+0x0/0x10
[  233.651695] [<ffffffff80460b64>] jbd2_journal_put_journal_head+0xcc/0x250
[  233.658484] [<ffffffff8045a1b4>] jbd2_journal_get_write_access+0x3c/0x58
[  233.665188] [<ffffffff804348a8>] __ext4_journal_get_write_access+0x58/0xa0
[  233.672064] [<ffffffff80410344>] ext4_reserve_inode_write+0x84/0xb0
[  233.678331] [<ffffffff804103ac>] ext4_mark_inode_dirty+0x3c/0x1e0
[  233.684424] [<ffffffff80410590>] ext4_dirty_inode+0x40/0x70
[  233.689998] [<ffffffff80392258>] __mark_inode_dirty+0x48/0x238
[  233.695832] [<ffffffff803828f4>] update_time+0xb4/0x100
[  233.701058] [<ffffffff803829f0>] file_update_time+0xb0/0x108
[  233.706718] [<ffffffff8031eb98>] __generic_file_aio_write+0x180/0x380
[  233.713158] [<ffffffff8031edf8>] generic_file_aio_write+0x60/0xc0
[  233.719252] [<ffffffff8040af54>] ext4_file_write+0x6c/0x468
[  233.724827] [<ffffffff80366cbc>] do_sync_write+0x84/0xe8
[  233.730139] [<ffffffff80368700>] vfs_write+0xe0/0x1e0
[  233.735191] [<ffffffff803688f8>] SyS_write+0x50/0xc0
[  233.740157] [<ffffffff80274864>] handle_sys64+0x44/0x64

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