On Fri, Jul 06, 2012 at 12:42:50PM +0200, Jan Schmidt wrote: > I've no good idea at the moment how to go on. It might help to get a feeling > if > it's shifting around at least a little bit or really constant in the timing of > occurrence. So can you please apply the next patch on top of the other two and > give it some more failure tries? The "checksum mismatch [1234]" line will be > of > most interest. I'm also curious what the additional debug variables will say > in > the extended version of the very first printk. You can leave out the stack > traces if you like, they won't matter much anyway.
Ok. Also turned on CONFIG_DEBUG_PAGEALLOC and CONFIG_SLUB_DEBUG_ON as
suggested by Chris Mason.
With those and the latest patch, there's an oops already at boot. I
don't have netconsole yet at that point, but here's the important
parts (sure I can capture it fully if you need).
By the way, something seems to be untabifying your patches. I don't
know if it's on my side or yours, but at least some other patches I
receive via linux-btrfs contain tabs. Doing a M-x tabify in emacs
mostly makes them apply cleanly for me.
Sami
------------------------------------------------------------
btrfs: disk space caching is enabled
BUG: unable to handle kernel NULL pointer dereference at 0000000000000150
IP: [<ffffffffa0223568>] check_node+0x138/0x250 [btrfs]
PGD 0
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
CPU 6
Modules linked in: <omitted> [last unloaded: scsi_wait_scan]
Pid: 1176, comm: btrfs-endio-met Tainted: G W 3.4.4+btrfsdebug2 #2
System Product Name/P8P67 EVO
RIP: 0010:[<ffffffffa0223568>] [<ffffffffa0223568>] check_node+0x138/0x250
[btrfs
[...]
Process btrfs-endio-met (pid: 1176, [...])
Call trace:
[...] btree_readpage_end_io_hook+0x1e5/0x2d0 [btrfs]
[...] end_bio_extent_readpage+0xcb/0xa30 [btrfs]
[...] ? end_workqueue_fn+0x31/0x50 [btrfs]
[...] bio_endio+0x18/0x30
[...] end_workqueue_fn+0x3c/0x50 [btrfs]
[...] worker_loop+0x157/0x560 [btrfs]
[...] ? btrfs_queue_worker+0x310/0x310 [btrfs]
[...] kthead+0x8e/0xa0
[...] kernel_thread_helper+0x4/0x10
[...] ? flush_kthread_worker+0x70/0x70
[...] ? gs_change+0x13/0x13
Code: [...]
RIP [<ffffffffa0223568>] check_node+0x138/0x250 [btrfs]
RSP <ffff8801f3843cb0>
------------------------------------------------------------
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