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| author | Volodymyr Mieshkov <volodymyr.mieshkov@ti.com> | 2012-10-18 17:44:34 +0300 |
|---|---|---|
| committer | Ziyann <jaraidaniel@gmail.com> | 2014-10-01 12:59:13 +0200 |
| commit | 6b198bde52f7f0e18d24d4ce5b87136956054cf5 (patch) | |
| tree | b2a1a59f92d7c6e992c89c7a0024347b7f05636b /fs/yaffs2 | |
| parent | bd17907818c82589c2673d5adc2e65f3598b9de1 (diff) | |
| download | kernel_samsung_tuna-6b198bde52f7f0e18d24d4ce5b87136956054cf5.zip kernel_samsung_tuna-6b198bde52f7f0e18d24d4ce5b87136956054cf5.tar.gz kernel_samsung_tuna-6b198bde52f7f0e18d24d4ce5b87136956054cf5.tar.bz2 | |
ext4: prevent kernel panic in case of uninitialized jinode
In some cases the kernel crash occurs during system suspend/resume:
[ 4095.041351] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 4095.050689] pgd = c0004000
[ 4095.053985] [00000000] *pgd=00000000
[ 4095.058807] Internal error: Oops: 5 [#1] PREEMPT SMP
[ 4095.064483] Modules linked in: wl12xx mac80211 pvrsrvkm_sgx540_120 cfg80211 compat [last unloaded: wl12xx_sdio]
[ 4095.064575] CPU: 1 Tainted: G B (3.0.31-01807-gfac16a0 #1)
[ 4095.064605] PC is at jbd2_journal_file_inode+0x38/0x118
[ 4095.064666] LR is at mpage_da_map_and_submit+0x48c/0x618
[ 4095.064697] pc : [<c01da5a8>] lr : [<c01aeac0>] psr: 60000013
[ 4095.064697] sp : c6e07c80 ip : c6e07ca0 fp : c6e07c9c
[ 4095.064727] r10: 00000001 r9 : c6e06000 r8 : 00000179
[ 4095.064758] r7 : c6e07ca0 r6 : c73b8400 r5 : 00000000 r4 : c59a7d80
[ 4095.064758] r3 : 00000038 r2 : 00000800 r1 : 00000000 r0 : c7754fc0
[ 4095.064788] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
[ 4095.064819] Control: 10c5387d Table: 86cc804a DAC: 00000015
[ 4095.064849]
[ 4095.064849] PC: 0xc01da528:
[ 4095.064880] a528 0a000003 e3a05000 e1a00005 e24bd020 e89da9f0 e5951010 e3e06000 e14b22dc
.....
[ 4095.070373] 7fe0: c00a48ac 00000013 00000000 c6e07ff8 c00a48ac c00c0a94 84752f09 60772177
[ 4095.070404] Backtrace:
[ 4095.070465] [<c01da570>] (jbd2_journal_file_inode+0x0/0x118) from [<c01aeac0>] (mpage_da_map_and_submit+0x48c/0x618)
[ 4095.070495] r7:c6e07ca0 r6:c6e07d00 r5:c6e07d90 r4:c7754fc0
[ 4095.070556] [<c01ae634>] (mpage_da_map_and_submit+0x0/0x618) from [<c01af40c>] (ext4_da_writepages+0x2a4/0x5c8)
[ 4095.070617] [<c01af168>] (ext4_da_writepages+0x0/0x5c8) from [<c0112af4>] (do_writepages+0x34/0x40)
[ 4095.070678] [<c0112ac0>] (do_writepages+0x0/0x40) from [<c01645a4>] (writeback_single_inode+0xd4/0x288)
[ 4095.070709] [<c01644d0>] (writeback_single_inode+0x0/0x288) from [<c0164ed4>] (writeback_sb_inodes+0xb4/0x184)
[ 4095.070770] [<c0164e20>] (writeback_sb_inodes+0x0/0x184) from [<c01655a0>] (writeback_inodes_wb+0xc4/0x13c)
[ 4095.070831] [<c01654dc>] (writeback_inodes_wb+0x0/0x13c) from [<c01658f0>] (wb_writeback+0x2d8/0x464)
[ 4095.070861] [<c0165618>] (wb_writeback+0x0/0x464) from [<c0165cb8>] (wb_do_writeback+0x23c/0x2c4)
[ 4095.070922] [<c0165a7c>] (wb_do_writeback+0x0/0x2c4) from [<c0165df4>] (bdi_writeback_thread+0xb4/0x2dc)
[ 4095.070953] [<c0165d40>] (bdi_writeback_thread+0x0/0x2dc) from [<c00c0b18>] (kthread+0x90/0x98)
[ 4095.071014] [<c00c0a88>] (kthread+0x0/0x98) from [<c00a48ac>] (do_exit+0x0/0x72c)
[ 4095.071044] r7:00000013 r6:c00a48ac r5:c00c0a88 r4:c78c7ec4
[ 4095.071105] Code: e89da8f0 e5963000 e3130002 1afffffa (e5913000)
[ 4095.071166] ---[ end trace 7fe9f9b727e5cf78 ]---
[ 4095.071197] Kernel panic - not syncing: Fatal exception
The probably reason of such behaviour is an inode opened in READ mode
has been marked as 'dirty' somehow and written back by ext4_da_writepages.
Cause jinode == NULL it could lead to the kernel panic.
The patch prevents kernel panic and helps to investigate the problem
providing an inode number.
Change-Id: I1d77a011b580db682b8e2d122ef3d5e44e0ce5c7
Signed-off-by: Volodymyr Mieshkov <volodymyr.mieshkov@ti.com>
Diffstat (limited to 'fs/yaffs2')
0 files changed, 0 insertions, 0 deletions