This is a test system so I'm reporting in case this is unknown but no
data at risk.
This filesystem was created with a device (well, actually partition)
/dev/sdb3, then /dev/sdc{2,3,4} were added, and finally I attempted to
remove /dev/sdb3. No profiles were passed at any point.
Briefly after starting the remove, which seemed to proceed fine
according to fi show, I started a rsync involving around 8GB from
another fs into the one being reshaped. Not sure if this could have been
related; rsync never transferred anything. Source was a degraded raid5
with six devices, one of them missing.
Soon everything requiring disk access froze. This was with latest ubuntu
stable upstream, i.e. 4.4.1-040401-generic
I rebooted without problems to mount the filesystems. As I write, I'm
doing the same process with latest 15.10 kernel 4.2.0-27-generic, for
the moment things going smoothly.
Login as root I captured the dmesg. Here is the final bit:
[ 600.114436] INFO: task D-Bus thread:7692 blocked for more than 120
seconds.
[ 600.114438] Tainted: P OE 4.4.1-040401-generic
#201601311534
[ 600.114440] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 600.114442] D-Bus thread D ffff88007e4bfde8 0 7692 2842
0x00000000
[ 600.114446] ffff88007e4bfde8 0000000000000000 ffffffff81e11500
ffff8800b0b65940
[ 600.114450] ffff88007e4c0000 ffff8800bf509e68 ffff8800bf509e80
ffff88007e4bff58
[ 600.114454] ffff8800b0b65940 ffff88007e4bfe00 ffffffff817f9b15
ffff8800b0b65940
[ 600.114458] Call Trace:
[ 600.114461] [<ffffffff817f9b15>] schedule+0x35/0x80
[ 600.114464] [<ffffffff817fc990>] rwsem_down_read_failed+0xe0/0x140
[ 600.114467] [<ffffffff817fd069>] ?
schedule_hrtimeout_range_clock+0x19/0x40
[ 600.114471] [<ffffffff813d7254>] call_rwsem_down_read_failed+0x14/0x30
[ 600.114474] [<ffffffff817fbf60>] ? down_read+0x20/0x30
[ 600.114477] [<ffffffff810686f5>] __do_page_fault+0x375/0x400
[ 600.114480] [<ffffffff810687a2>] do_page_fault+0x22/0x30
[ 600.114483] [<ffffffff817ffd38>] page_fault+0x28/0x30
[ 600.114487] INFO: task BrowserBlocking:7697 blocked for more than 120
seconds.
[ 600.114489] Tainted: P OE 4.4.1-040401-generic
#201601311534
[ 600.114491] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 600.114493] BrowserBlocking D ffff88003565fbe0 0 7697 2842
0x00000000
[ 600.114497] ffff88003565fbe0 00000058c6dff62b ffff88011abf8000
ffff8800ae816600
[ 600.114501] ffff880035660000 00000000ffffff00 ffff8800ae816600
ffff8800ae816600
[ 600.114505] ffff8800a35c1c70 ffff88003565fbf8 ffffffff817f9b15
ffff8800a35c1cd8
[ 600.114509] Call Trace:
[ 600.114512] [<ffffffff817f9b15>] schedule+0x35/0x80
[ 600.114534] [<ffffffffc0104cd6>] btrfs_tree_read_lock+0xe6/0x140 [btrfs]
[ 600.114538] [<ffffffff810bfec0>] ? wake_atomic_t_function+0x60/0x60
[ 600.114554] [<ffffffffc009eb24>] btrfs_read_lock_root_node+0x34/0x50
[btrfs]
[ 600.114569] [<ffffffffc00a3bef>] btrfs_search_slot+0x73f/0x9f0 [btrfs]
[ 600.114574] [<ffffffff81383f60>] ? crypto_shash_update+0x30/0xe0
[ 600.114593] [<ffffffffc00bc217>]
btrfs_check_dir_item_collision+0x77/0x120 [btrfs]
[ 600.114614] [<ffffffffc00d8150>] btrfs_rename2+0x130/0x7b0 [btrfs]
[ 600.114618] [<ffffffff81210500>] ? generic_permission+0x110/0x190
[ 600.114622] [<ffffffff8121338a>] vfs_rename+0x54a/0x870
[ 600.114626] [<ffffffff81333400>] ? security_path_rename+0x20/0xd0
[ 600.114630] [<ffffffff812180bb>] SyS_rename+0x38b/0x3d0
[ 600.114634] [<ffffffff817fdbb6>] entry_SYSCALL_64_fastpath+0x16/0x75
There's more before this but it looks similar.
Known issue?
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