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Date:	Tue, 29 Mar 2016 15:13:58 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 115491] New: ext4_mb_generate_buddy, filesystem remounted
 read-only

https://bugzilla.kernel.org/show_bug.cgi?id=115491

            Bug ID: 115491
           Summary: ext4_mb_generate_buddy, filesystem remounted read-only
           Product: File System
           Version: 2.5
    Kernel Version: 3.16.0-30
          Hardware: PPC-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@...nel-bugs.osdl.org
          Reporter: ebatewell@...ibm.com
        Regression: No

Similar to bug 104571 (https://bugzilla.kernel.org/show_bug.cgi?id=104571), we
have observed this. Excerpt from dmesg:

[86808.174336] EXT4-fs (sda2): error count since last fsck: 12
[86808.174345] EXT4-fs (sda2): initial error at time 1458455103:
ext4_mb_generate_buddy:757
[86808.174347] EXT4-fs (sda2): last error at time 1458572059:
ext4_remount:4849: inode 8524962: block 34112270
[94597.670282] [sched_delayed] sched: RT throttling activated
[173315.491461] EXT4-fs (sda2): error count since last fsck: 12
[173315.491468] EXT4-fs (sda2): initial error at time 1458455103:
ext4_mb_generate_buddy:757
[173315.491470] EXT4-fs (sda2): last error at time 1458572059:
ext4_remount:4849: inode 8524962: block 34112270
[190512.378738] rsync[85653]: unhandled signal 11 at 00003fffe48d0000 nip
00003fff972fd054 lr 00003fff972f6560 code 30001
[212232.198189] rsync[88408]: unhandled signal 11 at 00003fffeb8f0000 nip
00003fffa475d054 lr 00003fffa4756560 code 30001
[226392.672509] rsync[90221]: unhandled signal 11 at 00003fffc6460000 nip
00003fff983cd054 lr 00003fff983c6560 code 30001
[227413.044157] rsync[90355]: unhandled signal 11 at 00003fffe93f0000 nip
00003fff7831d054 lr 00003fff78316560 code 30001
[241933.061143] rsync[92307]: unhandled signal 11 at 00003ffff9e70000 nip
00003fffb430d054 lr 00003fffb4306560 code 30001
[247565.478035] EXT4-fs error (device sda2): ext4_mb_generate_buddy:757: group
2003, block bitmap and bg descriptor inconsistent: 146 vs 145 free clusters
[247565.478052] Aborting journal on device sda2-8.
[247565.482212] EXT4-fs (sda2): Remounting filesystem read-only
[247565.513031] EXT4-fs error (device sda2): ext4_journal_check_start:56:
[247565.513034] EXT4-fs error (device sda2): ext4_journal_check_start:56:
[247565.513038] EXT4-fs error (device sda2): ext4_journal_check_start:56:
Detected aborted journal
[247565.513039] Detected aborted journal
[247565.513051] EXT4-fs error (device sda2): ext4_journal_check_start:56:
Detected aborted journal
[247565.513056] Detected aborted journal
[247565.513080] EXT4-fs error (device sda2): ext4_journal_check_start:56:
Detected aborted journal

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