Brian Foster wrote:
> I threw a kmemcheck enabled kernel on a couple boxes out of curiosity.
> I didn't reproduce anything related to XFS with the "allow partially
> uninit." option enabled, even after running a quick group run in
> xfstests. Without that option, I did see an xlog_write() splat on a
> rhel7 boot but it was preceded by a constant stream of other reports
> (__d_lookup(), link_path_walk(), etc.) and ultimately resulted in a
> failed/hung bootup (after quite some time). I'm in the process of seeing
> a similar result on a Fedora vm running for-next. This isn't really
> debuggable in the current form due to the volume of preceding errors,
> the required boot time and the fact that my machines ultimately fall
> over.
>
> Do you see different behavior? Do you have the "allow partially
> uninitialized memory" option enabled or disabled? I wonder if there are
> fixes for these other errors I'm seeing in linux-next that XFS for-next
> hasn't picked up yet..?
When I tested using linux-next-20170901, xlog_write() was the first splat
(after I workarounded take_dentry_name_snapshot() splat).
Today I retested using linux.git with a different VM and got a different result.
Here are console log and kernel config as of 6d8ef53e8b2fed8b ("Merge tag 'f2fs-for-4.14'
of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs") on linux.git .
http://I-love.SAKURA.ne.jp/tmp/serial-20170913.txt.xz
http://I-love.SAKURA.ne.jp/tmp/config-4.13-20170913
CONFIG_HAVE_ARCH_KMEMCHECK=y
CONFIG_KMEMCHECK=y
# CONFIG_KMEMCHECK_DISABLED_BY_DEFAULT is not set
CONFIG_KMEMCHECK_ENABLED_BY_DEFAULT=y
# CONFIG_KMEMCHECK_ONESHOT_BY_DEFAULT is not set
CONFIG_KMEMCHECK_QUEUE_SIZE=64
CONFIG_KMEMCHECK_SHADOW_COPY_SHIFT=5
CONFIG_KMEMCHECK_PARTIAL_OK=y
# CONFIG_KMEMCHECK_BITOPS_OK is not set
----------
Mounting Huge Pages File System...
[ OK ] Stopped target Switch Root.
[ OK ] Stopped target Initrd File Systems.[ 1054.691505] WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (ffff880135396660)
[ 1054.691506] 000000000000000093050a200000000000000000000000000000000000000000
[ 1054.691511] u u u u u u u u i i i i i i i i u u u u u u u u u u u u u u u u
[ 1054.691515] ^
[ 1054.691519] RIP: 0010:xlog_write+0x344/0x6b0
[ 1054.691519] RSP: 0018:ffff8801356d7cd8 EFLAGS: 00010202
[ 1054.691520] RAX: 0000000000000038 RBX: 0000000000000002 RCX: 000000000000000c
[ 1054.691520] RDX: 0000000000000038 RSI: ffff880135396660 RDI: ffffc9000180823c
[ 1054.691521] RBP: ffff8801356d7d70 R08: ffffc90001808234 R09: 0000000000000000
[ 1054.691521] R10: 0000000000000038 R11: 0000000000000000 R12: 0000000000000000
[ 1054.691521] R13: ffff880135396600 R14: 00000000000002b4 R15: ffff8801323f2000
[ 1054.691522] FS: 0000000000000000(0000) GS:ffff88013f400000(0000) knlGS:0000000000000000
[ 1054.691523] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1054.691524] CR2: ffff8801351a3c18 CR3: 000000013d5e4005 CR4: 00000000001606f0
[ 1054.691525] xlog_write+0x344/0x6b0
[ 1054.691526] xlog_cil_push+0x240/0x460
[ 1054.691527] xlog_cil_push_work+0x10/0x20
[ 1054.691529] process_one_work+0x121/0x2a0
[ 1054.691529] worker_thread+0x1b7/0x390
[ 1054.691531] kthread+0xff/0x140
[ 1054.691532] ret_from_fork+0x22/0x30
[ 1054.691534] 0xffffffffffffffff
[ OK ] Stopped target Initrd Root File System.
----------
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