Public bug reported:
After upgrading server (xen pvm) to linux-image-4.4.0-59-generic from 4.4.0-57
it locked up soon after using the btrfs filesystem. (Startup looked OK.) No
problem with 4.4.0-57. Standard 16.04 stable install.
Reverting to 4.4.0-57 fixed the problem, just sharing to help others with
similar issue and have a chance to hear if it's a known problem. (I did not
find one.)
Feb 2 10:06:36 server1 kernel: [10484.092006] NMI watchdog: BUG: soft lockup -
CPU#5 stuck for 23s! [apache2:1704]
...
Feb 2 10:06:36 server1 kernel: [10484.092043] Call Trace:
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff818381d3>]
_raw_read_lock+0x23/0x30
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc017f80a>]
btrfs_tree_read_lock_atomic+0x2a/0x60 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc011daff>]
btrfs_search_slot+0x59f/0xa00 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc011890a>] ?
btrfs_alloc_path+0x1a/0x20 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff810caf11>] ?
__raw_callee_save___pv_queued_spin_unlock+0x11/0x20
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc0136a8e>]
btrfs_lookup_csum+0x4e/0x150 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc0136d3c>]
__btrfs_lookup_bio_sums.isra.7+0x1ac/0x500 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc01486c0>] ?
btrfs_real_readdir+0x5e0/0x5e0 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff811ed017>] ?
kmem_cache_alloc+0x187/0x1f0
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc013ca98>] ?
btrfs_bio_wq_end_io+0x28/0x70 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc0137316>]
btrfs_lookup_bio_sums+0x36/0x40 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc0145f13>]
btrfs_submit_bio_hook+0x133/0x1b0 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc016059d>]
submit_one_bio+0x6d/0xa0 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc01673c3>]
extent_readpages+0x143/0x200 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc01486c0>] ?
btrfs_real_readdir+0x5e0/0x5e0 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff811e271c>] ?
alloc_pages_current+0x8c/0x110
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffffc014632f>]
btrfs_readpages+0x1f/0x30 [btrfs]
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8119db06>]
__do_page_cache_readahead+0x196/0x230
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff81218ef4>] ?
terminate_walk+0x64/0xd0
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8119dc70>]
ondemand_readahead+0xd0/0x250
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8119df8e>]
page_cache_sync_readahead+0x2e/0x50
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8119089d>]
generic_file_read_iter+0x4ad/0x5c0
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8120e394>]
new_sync_read+0x94/0xd0
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8120e3f6>]
__vfs_read+0x26/0x40
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8120e9b6>]
vfs_read+0x86/0x130
Feb 2 10:06:36 server1 kernel: [10484.092043] [<ffffffff8120f705>]
SyS_read+0x55/0xc0
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: btrfs kernel lockup
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https://bugs.launchpad.net/bugs/1665576
Title:
btrfs lockup with linux-image-4.4.0-59-generic
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