Today I accidentally discovered that it is not possible to suspend (hibernate) the system while the btrfs scrub process is running (see the attached log). Could this be considered a bug, or did I miss something?
Some more info: $ uname -a Linux asusntb 3.13.6-1-ARCH #1 SMP PREEMPT Fri Mar 7 22:47:48 CET 2014 x86_64 GNU/Linux and btrfs-progs-3.12 is installed. Regards, Jakub Klinkovský
Mar 20 09:03:13 asusntb systemd[1]: Starting Sleep.
Mar 20 09:03:13 asusntb systemd[1]: Reached target Sleep.
Mar 20 09:03:13 asusntb systemd[1]: Starting Hibernate...
Mar 20 09:03:13 asusntb systemd-sleep[12696]: Suspending system...
Mar 20 09:03:34 asusntb kernel: PM: Syncing filesystems ... done.
Mar 20 09:03:34 asusntb kernel: Freezing user space processes ...
Mar 20 09:03:34 asusntb kernel: Freezing of tasks failed after 20.004 seconds
(1 tasks refusing to freeze, wq_busy=0):
Mar 20 09:03:34 asusntb kernel: btrfs D 00000000ffffffff 0 9695
1 0x00000004
Mar 20 09:03:34 asusntb kernel: ffff880101249920 0000000000000082
ffff8800baf02400 ffff880101249fd8
Mar 20 09:03:34 asusntb kernel: 0000000000014440 0000000000014440
ffff8800baf02400 ffff8800baf02400
Mar 20 09:03:34 asusntb kernel: 0000000000000001 ffff8800baf02400
ffff88013fff9b08 ffff8800baf02400
Mar 20 09:03:34 asusntb kernel: Call Trace:
Mar 20 09:03:34 asusntb kernel: [<ffffffff8117e5c3>] ?
alloc_pages_current+0xa3/0x160
Mar 20 09:03:34 asusntb kernel: [<ffffffff81515d99>] schedule+0x29/0x70
Mar 20 09:03:34 asusntb kernel: [<ffffffffa0c2df3d>] scrub_pages+0x38d/0x4e0
[btrfs]
Mar 20 09:03:34 asusntb kernel: [<ffffffff810a2c30>] ? __wake_up_sync+0x20/0x20
Mar 20 09:03:34 asusntb kernel: [<ffffffffa0c2eb68>] scrub_stripe+0x998/0x1110
[btrfs]
Mar 20 09:03:34 asusntb kernel: [<ffffffffa0bd7a06>] ?
btrfs_buffer_uptodate+0x56/0x80 [btrfs]
Mar 20 09:03:34 asusntb kernel: [<ffffffffa0c30bdb>]
scrub_chunk.isra.12+0x10b/0x130 [btrfs]
Mar 20 09:03:34 asusntb kernel: [<ffffffffa0c30e54>]
scrub_enumerate_chunks+0x254/0x510 [btrfs]
Mar 20 09:03:34 asusntb kernel: [<ffffffff810a2c00>] ?
__wake_up_sync_key+0x50/0x60
Mar 20 09:03:34 asusntb kernel: [<ffffffffa0c312ac>]
btrfs_scrub_dev+0x19c/0x4f0 [btrfs]
Mar 20 09:03:34 asusntb kernel: [<ffffffffa0c0f078>] btrfs_ioctl+0x1528/0x27a0
[btrfs]
Mar 20 09:03:34 asusntb kernel: [<ffffffff8107b5a6>] ? __queue_work+0x136/0x360
Mar 20 09:03:34 asusntb kernel: [<ffffffff8151d5c4>] ?
__do_page_fault+0x2c4/0x5b0
Mar 20 09:03:34 asusntb kernel: [<ffffffff81292716>] ? put_io_context+0x66/0xa0
Mar 20 09:03:34 asusntb kernel: [<ffffffff811b6080>] do_vfs_ioctl+0x2e0/0x4c0
Mar 20 09:03:34 asusntb kernel: [<ffffffff811b62e1>] SyS_ioctl+0x81/0xa0
Mar 20 09:03:34 asusntb kernel: [<ffffffff8151d8be>] ? do_page_fault+0xe/0x10
Mar 20 09:03:34 asusntb kernel: [<ffffffff815216ad>]
system_call_fastpath+0x1a/0x1f
Mar 20 09:03:34 asusntb kernel:
Mar 20 09:03:34 asusntb systemd-logind[246]: Lid closed.
Mar 20 09:03:34 asusntb kernel: Restarting tasks ... done.
Mar 20 09:03:34 asusntb kernel: video LNXVIDEO:00: Restoring backlight state
Mar 20 09:03:34 asusntb systemd[1]: systemd-hibernate.service: main process
exited, code=exited, status=1/FAILURE
Mar 20 09:03:34 asusntb systemd[1]: Failed to start Hibernate.
Mar 20 09:03:34 asusntb systemd[1]: Dependency failed for Hibernate.
Mar 20 09:03:34 asusntb systemd[1]: Service sleep.target is not needed anymore.
Stopping.
Mar 20 09:03:34 asusntb systemd[1]: Unit systemd-hibernate.service entered
failed state.
Mar 20 09:03:34 asusntb systemd[1]: Stopping Sleep.
Mar 20 09:03:34 asusntb systemd[1]: Stopped target Sleep.
Mar 20 09:03:34 asusntb systemd[1]: Stopping Hibernate.
Mar 20 09:03:34 asusntb systemd[1]: Stopped target Hibernate.
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