On Tue, Jan 27, 2015 at 11:11 AM, Filipe Manana <fdman...@suse.com>
wrote:
While running a scrub on a kernel with CONFIG_DEBUG_PAGEALLOC=y, I got
the following trace:
This actually trades one bug for another:
[ 1928.950319] BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:621^M
[ 1928.967334] in_atomic(): 1, irqs_disabled(): 0, pid: 149670, name:
fsstress^M
[ 1928.981324] INFO: lockdep is turned off.^M
[ 1928.989244] CPU: 24 PID: 149670 Comm: fsstress Tainted: G W
3.19.0-rc7-mason+ #41^M
[ 1929.006418] Hardware name: ZTSYSTEMS Echo Ridge T4 /A9DRPF-10D,
BIOS 1.07 05/10/2012^M
[ 1929.022207] ffffffff81a22cf8 ffff881076e03b78 ffffffff816b8dd9
ffff881076e03b78^M
[ 1929.037267] ffff880d8e828710 ffff881076e03ba8 ffffffff810856c4
ffff881076e03bc8^M
[ 1929.052315] 0000000000000000 000000000000026d ffffffff81a22cf8
ffff881076e03bd8^M
[ 1929.067381] Call Trace:^M
[ 1929.072344] <IRQ> [<ffffffff816b8dd9>] dump_stack+0x4f/0x6e^M
[ 1929.083968] [<ffffffff810856c4>] ___might_sleep+0x174/0x230^M
[ 1929.095352] [<ffffffff810857d2>] __might_sleep+0x52/0x90^M
[ 1929.106223] [<ffffffff816bb68f>] mutex_lock_nested+0x2f/0x3b0^M
[ 1929.117951] [<ffffffff810ab37d>] ? trace_hardirqs_on+0xd/0x10^M
[ 1929.129708] [<ffffffffa05dc838>] scrub_pending_bio_dec+0x38/0x70
[btrfs]^M
[ 1929.143370] [<ffffffffa05dd0e0>] scrub_parity_bio_endio+0x50/0x70
[btrfs]^M
[ 1929.157191] [<ffffffff812fa603>] bio_endio+0x53/0xa0^M
[ 1929.167382] [<ffffffffa05f96bc>] rbio_orig_end_io+0x7c/0xa0
[btrfs]^M
[ 1929.180161] [<ffffffffa05f97ba>] raid_write_parity_end_io+0x5a/0x80
[btrfs]^M
[ 1929.194318] [<ffffffff812fa603>] bio_endio+0x53/0xa0^M
[ 1929.204496] [<ffffffff8130401b>] blk_update_request+0x1eb/0x450^M
[ 1929.216569] [<ffffffff81096e58>] ? trigger_load_balance+0x78/0x500^M
[ 1929.229176] [<ffffffff8144c74d>] scsi_end_request+0x3d/0x1f0^M
[ 1929.240740] [<ffffffff8144ccac>] scsi_io_completion+0xac/0x5b0^M
[ 1929.252654] [<ffffffff81441c50>] scsi_finish_command+0xf0/0x150^M
[ 1929.264725] [<ffffffff8144d317>] scsi_softirq_done+0x147/0x170^M
[ 1929.276635] [<ffffffff8130ace6>] blk_done_softirq+0x86/0xa0^M
[ 1929.288014] [<ffffffff8105d92e>] __do_softirq+0xde/0x600^M
[ 1929.298885] [<ffffffff8105df6d>] irq_exit+0xbd/0xd0^M
[ 1929.308879] [<ffffffff81034ea5>]
smp_call_function_single_interrupt+0x35/0x40^M
[ 1929.323455] [<ffffffff816c126f>]
call_function_single_interrupt+0x6f/0x80^M
[ 1929.337270] <EOI> [<ffffffff811fc745>] ?
sync_inodes_sb+0x1b5/0x2a0^M
[ 1929.350261] [<ffffffff811fc728>] ? sync_inodes_sb+0x198/0x2a0^M
[ 1929.361991] [<ffffffff816badcf>] ? wait_for_completion+0xef/0x120^M
[ 1929.374423] [<ffffffff812028d0>] ? fdatawrite_one_bdev+0x20/0x20^M
[ 1929.386671] [<ffffffff812028d0>] ? fdatawrite_one_bdev+0x20/0x20^M
[ 1929.398930] [<ffffffff812028ed>] sync_inodes_one_sb+0x1d/0x30^M
[ 1929.410668] [<ffffffff811cf4c6>] iterate_supers+0xb6/0xf0^M
[ 1929.421712] [<ffffffff81202935>] sys_sync+0x35/0x90^M
[ 1929.431704] [<ffffffff816bfed2>] system_call_fastpath+0x12/0x17^M
So we'll have to either put in a refcount or a spinlock instead.
-chris
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