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Subject[Regression] 3.15 mmc related ext4 corruption with qemu-system-arm
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I've been seeing some ext4 corruption with recent kernels under qemu-system-arm.

This issue seems to crop up after shutting down uncleanly (terminating
qemu), shortly after booting about 50% of the time.

ext4/mmc related dmesg details are:
[ 3.206809] mmci-pl18x mb:mmci: mmc0: PL181 manf 41 rev0 at
0x10005000 irq 41,42 (pio)
[ 3.268316] mmc0: new SDHC card at address 4567
[ 3.281963] mmcblk0: mmc0:4567 QEMU! 2.00 GiB
[ 3.315699] mmcblk0: p1 p2 p3 p4 < p5 p6 >
...
[ 11.806169] EXT4-fs (mmcblk0p5): Ignoring removed nomblk_io_submit option
[ 11.904714] EXT4-fs (mmcblk0p5): recovery complete
[ 11.905854] EXT4-fs (mmcblk0p5): mounted filesystem with ordered
data mode. Opts: nomblk_io_submit,errors=panic
...
[ 91.558824] EXT4-fs error (device mmcblk0p5):
ext4_mb_generate_buddy:756: group 1, 2252 clusters in bitmap, 2284 in
gd; block bitmap corrupt.
[ 91.560641] Aborting journal on device mmcblk0p5-8.
[ 91.562589] Kernel panic - not syncing: EXT4-fs (device mmcblk0p5):
panic forced after error
[ 91.562589]
[ 91.563486] CPU: 0 PID: 1 Comm: init Not tainted 3.15.0-rc1 #560
[ 91.564616] [<c00116e5>] (unwind_backtrace) from [<c000f3b1>]
(show_stack+0x11/0x14)
[ 91.565154] [<c000f3b1>] (show_stack) from [<c04262b1>]
(dump_stack+0x59/0x7c)
[ 91.565666] [<c04262b1>] (dump_stack) from [<c0423297>] (panic+0x67/0x178)
[ 91.566147] [<c0423297>] (panic) from [<c0134bb1>]
(ext4_handle_error+0x69/0x74)
[ 91.566659] [<c0134bb1>] (ext4_handle_error) from [<c0135437>]
(__ext4_grp_locked_error+0x6b/0x160)
[ 91.567223] [<c0135437>] (__ext4_grp_locked_error) from
[<c0143079>] (ext4_mb_generate_buddy+0x1b1/0x29c)
[ 91.567860] [<c0143079>] (ext4_mb_generate_buddy) from [<c01447e5>]
(ext4_mb_init_cache+0x219/0x4e0)
[ 91.568473] [<c01447e5>] (ext4_mb_init_cache) from [<c0144b67>]
(ext4_mb_init_group+0xbb/0x138)
[ 91.569021] [<c0144b67>] (ext4_mb_init_group) from [<c0144cd7>]
(ext4_mb_good_group+0xf3/0xfc)
[ 91.569659] [<c0144cd7>] (ext4_mb_good_group) from [<c0145c8f>]
(ext4_mb_regular_allocator+0x153/0x2c4)
[ 91.570250] [<c0145c8f>] (ext4_mb_regular_allocator) from
[<c0148095>] (ext4_mb_new_blocks+0x2fd/0x4e4)
[ 91.570868] [<c0148095>] (ext4_mb_new_blocks) from [<c013f931>]
(ext4_ext_map_blocks+0x965/0x10bc)
[ 91.571444] [<c013f931>] (ext4_ext_map_blocks) from [<c0122c8b>]
(ext4_map_blocks+0xfb/0x36c)
[ 91.571992] [<c0122c8b>] (ext4_map_blocks) from [<c01263b1>]
(mpage_map_and_submit_extent+0x99/0x5f0)
[ 91.572614] [<c01263b1>] (mpage_map_and_submit_extent) from
[<c0126bc1>] (ext4_writepages+0x2b9/0x4e8)
[ 91.573201] [<c0126bc1>] (ext4_writepages) from [<c0094ae9>]
(do_writepages+0x19/0x28)
[ 91.573709] [<c0094ae9>] (do_writepages) from [<c008c811>]
(__filemap_fdatawrite_range+0x3d/0x44)
[ 91.574265] [<c008c811>] (__filemap_fdatawrite_range) from
[<c008c883>] (filemap_flush+0x23/0x28)
[ 91.574854] [<c008c883>] (filemap_flush) from [<c012bf75>]
(ext4_rename+0x2f9/0x3e4)
[ 91.575360] [<c012bf75>] (ext4_rename) from [<c00c3363>]
(vfs_rename+0x183/0x45c)
[ 91.575911] [<c00c3363>] (vfs_rename) from [<c00c3867>]
(SyS_renameat2+0x22b/0x26c)
[ 91.576460] [<c00c3867>] (SyS_renameat2) from [<c00c38df>]
(SyS_rename+0x1f/0x24)
[ 91.576961] [<c00c38df>] (SyS_rename) from [<c000cd01>]
(ret_fast_syscall+0x1/0x5c)


Bisecting this points to: e7f3d22289e4307b3071cc18b1d8ecc6598c0be4
(mmc: mmci: Handle CMD irq before DATA irq). Which I guess shouldn't
be surprising, as I saw problems with that patch earlier in the
3.15-rc cycle:
https://lkml.org/lkml/2014/4/14/824

However that discussion petered out (possibly my fault for not
following up) as to if it was an issue with the patch or a issue with
qemu. Then the original issue disappeared for me, which I figured was
due to a fix upstream, but now I'm guessing coincided with me updating
my system and getting qemu v2.0 (where as previously I was on 1.5).

$ qemu-system-arm -version
QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.1), Copyright
(c) 2003-2008 Fabrice Bellard

While the previous behavior was annoying and kept my emulated
environments from booting, this while a bit more rare and subtle eats
the disks, which is much more painful for my testing.

Unfortunately reverting the change (manually, as it doesn't revert
cleanly anymore) doesn't seem to completely avoid the issue, so the
bisection may have gone slightly astray (though it is interesting it
landed on the same commit I earlier had trouble with). So I'll
back-track and double check some of the last few "good" results to
validate I didn't just luck into 3 good boots accidentally. I'll also
review my revert in case I missed something subtle in doing it
manually.

Anyway, if there is any thoughts on how to better chase this down and
debug it, I'd appreciate it! I can also provide reproduction
instructions with a pre-built Linaro android disk image and hand built
kernel if anyone wants to debug this themselves.

thanks
-john


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