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SubjectOops while going into hibernate
Hi,

while goning into hibernation right after resuming with
2.6.37-05668-g4162cf6 on S390 I get this one:

[ 270.317785] PM: Basic memory bitmaps created
[ 270.317789] PM: Syncing filesystems ...
[ 270.318854] Unable to handle kernel pointer dereference at virtual kernel address (null)
[ 270.318865] Oops: 0004 [#1] PREEMPT SMP
[ 270.318878] Modules linked in: binfmt_misc dm_multipath scsi_dh vmur [last unloaded: scsi_wait_scan]
[ 270.318900] CPU: 0 Not tainted 2.6.37-05668-g4162cf6 #19
[ 270.318907] Process flush-94:0 (pid: 1226, task: 000000003f0a0040, ksp: 000000003d75fc70)
[ 270.318916] Krnl PSW : 0704000180000000 0000000000206662 (jbd2_journal_file_inode+0xfe/0x148)
[ 270.318938] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3
[ 270.318948] Krnl GPRS: ffe62f366dac01a2 0000000000000000 0000000000000000 00000000007e4260
[ 270.318961] 00000000002065dc 6880000000000000 000000003f234d60 0000000000000005
[ 270.318971] 000000003f6e15a8 000000003d75fa88 000000003ed59228 000000003ed58c60
[ 270.319105] 0000000000000000 000000003f036488 00000000002065dc 000000003d75f9a0
[ 270.319123] Krnl Code: 0000000000206656: b9140022 lgfr %r2,%r2
[ 270.319133] 000000000020665a: 07f4 bcr 15,%r4
[ 270.319145] 000000000020665c: ec260023007c cgij %r2,0,6,2066a2
[ 270.319158] >0000000000206662: e3d0c0000024 stg %r13,0(%r12)
[ 270.319181] 0000000000206668: 4110c010 la %r1,16(%r12)
[ 270.319198] 000000000020666c: e320d0600004 lg %r2,96(%r13)
[ 270.319241] 0000000000206672: e31020080024 stg %r1,8(%r2)
[ 270.319260] 0000000000206678: e320c0100024 stg %r2,16(%r12)
[ 270.319281] Call Trace:
[ 270.319289] ([<00000000002065dc>] jbd2_journal_file_inode+0x78/0x148)
[ 270.319303] [<00000000001d0f66>] mpage_da_map_and_submit+0x2ea/0x440
[ 270.319319] [<00000000001d197a>] ext4_da_writepages+0x32e/0x744
[ 270.319334] [<000000000016fe64>] writeback_single_inode+0xd4/0x25c
[ 270.319391] [<0000000000170514>] writeback_sb_inodes+0xd0/0x160
[ 270.319396] [<0000000000171278>] writeback_inodes_wb+0x90/0x16c
[ 270.319408] [<00000000001715fa>] wb_writeback+0x2a6/0x480
[ 270.319414] [<00000000001718b6>] wb_do_writeback+0xe2/0x294
[ 270.319419] [<0000000000171b14>] bdi_writeback_thread+0xac/0x2fc
[ 270.319424] [<000000000007d192>] kthread+0xbe/0xc8
[ 270.319457] [<000000000047910a>] kernel_thread_starter+0x6/0xc
[ 270.319467] [<0000000000479104>] kernel_thread_starter+0x0/0xc
bisecting points to:

commit 8aefcd557d26d0023a36f9ec5afbf55e59f8f26b
Author: Theodore Ts'o <tytso@mit.edu>
Date: Mon Jan 10 12:29:43 2011 -0500

ext4: dynamically allocate the jbd2_inode in ext4_inode_info as necessary

Replace the jbd2_inode structure (which is 48 bytes) with a pointer
and only allocate the jbd2_inode when it is needed --- that is, when
the file system has a journal present and the inode has been opened
for writing. This allows us to further slim down the ext4_inode_info
structure.

Regards,
Sebastian


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