Hi,
The following two stacktraces appeared in my syslog (are they of any use?).
The "possible recursive locking" occured around the end of untaring a 4gig tar
ball.
I think the other one occurred during a 'yum upgrade'.
Cheers,
Ralph.
Dec 24 20:26:01 i kernel: [113505.458570]
Dec 24 20:26:01 i kernel: [113505.458574]
=============================================
Dec 24 20:26:01 i kernel: [113505.458584] [ INFO: possible recursive locking
detected ]
Dec 24 20:26:01 i kernel: [113505.458592] 2.6.37-0.rc7.git0.1.fc15.x86_64 #1
Dec 24 20:26:01 i kernel: [113505.458599]
---------------------------------------------
Dec 24 20:26:01 i kernel: [113505.458606] firefox/4852 is trying to acquire
lock:
Dec 24 20:26:01 i kernel: [113505.458613] (&(&eb->lock)->rlock){+.+...}, at:
[<ffffffffa0161b89>] btrfs_try_spin_lock+0x2a/0x89 [btrfs]
Dec 24 20:26:01 i kernel: [113505.458680]
Dec 24 20:26:01 i kernel: [113505.458683] but task is already holding lock:
Dec 24 20:26:01 i kernel: [113505.458689] (&(&eb->lock)->rlock){+.+...}, at:
[<ffffffffa0161b56>] btrfs_clear_lock_blocking+0x22/0x2b [btrfs]
Dec 24 20:26:01 i kernel: [113505.458746]
Dec 24 20:26:01 i kernel: [113505.458748] other info that might help us debug
this:
Dec 24 20:26:01 i kernel: [113505.458755] 2 locks held by firefox/4852:
Dec 24 20:26:01 i kernel: [113505.458760] #0:
(&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff8113eee3>]
do_last+0x1db/0x5bb
Dec 24 20:26:01 i kernel: [113505.458783] #1: (&(&eb->lock)->rlock){+.+...},
at: [<ffffffffa0161b56>] btrfs_clear_lock_blocking+0x22/0x2b [btrfs]
Dec 24 20:26:01 i kernel: [113505.458839]
Dec 24 20:26:01 i kernel: [113505.458841] stack backtrace:
Dec 24 20:26:01 i kernel: [113505.458849] Pid: 4852, comm: firefox Tainted: G
W 2.6.37-0.rc7.git0.1.fc15.x86_64 #1
Dec 24 20:26:01 i kernel: [113505.458856] Call Trace:
Dec 24 20:26:01 i kernel: [113505.458869] [<ffffffff81082a4b>]
__lock_acquire+0x945/0xd65
Dec 24 20:26:01 i kernel: [113505.458882] [<ffffffff8101161c>] ?
sched_clock+0x9/0xd
Dec 24 20:26:01 i kernel: [113505.458895] [<ffffffff8107516d>] ?
sched_clock_local+0x12/0x75
Dec 24 20:26:01 i kernel: [113505.458944] [<ffffffffa0161b56>] ?
btrfs_clear_lock_blocking+0x22/0x2b [btrfs]
Dec 24 20:26:01 i kernel: [113505.458994] [<ffffffffa0161b89>] ?
btrfs_try_spin_lock+0x2a/0x89 [btrfs]
Dec 24 20:26:01 i kernel: [113505.459005] [<ffffffff8108333a>]
lock_acquire+0xc8/0xf3
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa0161b89>] ?
btrfs_try_spin_lock+0x2a/0x89 [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff814b491b>]
_raw_spin_lock+0x36/0x69
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa0161b89>] ?
btrfs_try_spin_lock+0x2a/0x89 [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa0161b89>]
btrfs_try_spin_lock+0x2a/0x89 [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa0124388>]
btrfs_search_slot+0x3e5/0x51e [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa0133715>]
btrfs_lookup_inode+0x2f/0x92 [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa0141b18>]
btrfs_iget+0xb9/0x415 [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa01421ce>]
btrfs_lookup_dentry+0xff/0x3c6 [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff81083266>] ?
lock_release+0x198/0x1a4
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffffa01424ab>]
btrfs_lookup+0x16/0x2e [btrfs]
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8113c798>]
d_alloc_and_lookup+0x4c/0x74
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8113c9a7>]
__lookup_hash+0x8d/0x96
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8113c9c9>]
lookup_hash+0x19/0x1b
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8113eeeb>]
do_last+0x1e3/0x5bb
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff81257a5d>] ?
__raw_spin_lock_init+0x31/0x50
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8113f4ec>]
do_filp_open+0x229/0x5d9
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff81011611>] ?
native_sched_clock+0x35/0x37
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8107533e>] ?
local_clock+0x36/0x4d
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff81083266>] ?
lock_release+0x198/0x1a4
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff81149a48>] ?
alloc_fd+0x181/0x193
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff81132765>]
do_sys_open+0x60/0xf6
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff814b468d>] ?
trace_hardirqs_on_thunk+0x3a/0x3f
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8113281b>]
sys_open+0x20/0x22
Dec 24 20:26:01 i kernel: [113505.459012] [<ffffffff8100ac82>]
system_call_fastpath+0x16/0x1b
Dec 24 17:05:34 i kernel: [101478.939852] btrfs: unlinked 54 orphans
Dec 24 17:05:36 i kernel: [101480.382989] btrfs: unlinked 1 orphans
Dec 24 17:07:07 i kernel: [101572.158254] ------------[ cut here ]------------
Dec 24 17:07:07 i kernel: [101572.158263] WARNING: at kernel/lockdep.c:678
look_up_lock_class+0x9b/0xc4()
Dec 24 17:07:07 i kernel: [101572.158266] Hardware name: GA-MA790GP-DS4H
Dec 24 17:07:07 i kernel: [101572.158267] Modules linked in: ipt_MASQUERADE
nf_nat_h323 nf_conntrack_h323 nf_nat_pptp nf_conntrack_pptp
nf_conntrack_proto_gre nf_nat_proto_gre nf_nat_tftp nf_connt
rack_tftp nf_nat_sip nf_conntrack_sip nf_nat_irc nf_conntrack_irc nf_nat_ftp
nf_conntrack_ftp iptable_nat nf_nat tcp_diag inet_diag sco bnep l2cap k8temp
bluetooth it87 hwmon_vid cpufreq_ondemand
powernow_k8 freq_table mperf snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_intel snd_usb_audio snd_hda_codec arc4 ecb snd_usbmidi_lib snd_hwdep
snd_seq e100 rt73usb crc_itu_t rt2x00usb rt2x00li
b snd_rawmidi uvcvideo videodev v4l1_compat v4l2_compat_ioctl32 r8169 mac80211
snd_seq_device snd_pcm mii snd_timer i2c_piix4 snd edac_core cfg80211 rfkill
snd_page_alloc edac_mce_amd shpchp serio
_raw microcode soundcore wmi k10temp kvm_amd kvm uinput ipv6 btrfs zlib_deflate
libcrc32c pata_acpi ata_generic pata_atiixp radeon ttm drm_kms_helper drm
i2c_algo_bit i2c_core [last unloaded: scsi
_wait_scan]
Dec 24 17:07:07 i kernel: [101572.158326] Pid: 379, comm: btrfs-cleaner Not
tainted 2.6.37-0.rc7.git0.1.fc15.x86_64 #1
Dec 24 17:07:07 i kernel: [101572.158328] Call Trace:
Dec 24 17:07:07 i kernel: [101572.158334] [<ffffffff810533dc>]
warn_slowpath_common+0x85/0x9d
Dec 24 17:07:07 i kernel: [101572.158338] [<ffffffff8105340e>]
warn_slowpath_null+0x1a/0x1c
Dec 24 17:07:07 i kernel: [101572.158341] [<ffffffff8107fb86>]
look_up_lock_class+0x9b/0xc4
Dec 24 17:07:07 i kernel: [101572.158344] [<ffffffff8107fff7>]
register_lock_class+0x1e/0x2e2
Dec 24 17:07:07 i kernel: [101572.158348] [<ffffffff81011269>] ?
paravirt_read_tsc+0x9/0xd
Dec 24 17:07:07 i kernel: [101572.158350] [<ffffffff81011611>] ?
native_sched_clock+0x35/0x37
Dec 24 17:07:07 i kernel: [101572.158353] [<ffffffff8101161c>] ?
sched_clock+0x9/0xd
Dec 24 17:07:07 i kernel: [101572.158356] [<ffffffff810821ee>]
__lock_acquire+0xe8/0xd65
Dec 24 17:07:07 i kernel: [101572.158359] [<ffffffff81011269>] ?
paravirt_read_tsc+0x9/0xd
Dec 24 17:07:07 i kernel: [101572.158361] [<ffffffff81011269>] ?
paravirt_read_tsc+0x9/0xd
Dec 24 17:07:07 i kernel: [101572.158363] [<ffffffff81011611>] ?
native_sched_clock+0x35/0x37
Dec 24 17:07:07 i kernel: [101572.158383] [<ffffffffa0161c41>] ?
btrfs_tree_lock+0x59/0xb8 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158386] [<ffffffff8108333a>]
lock_acquire+0xc8/0xf3
Dec 24 17:07:07 i kernel: [101572.158400] [<ffffffffa0161c41>] ?
btrfs_tree_lock+0x59/0xb8 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158404] [<ffffffff8107533e>] ?
local_clock+0x36/0x4d
Dec 24 17:07:07 i kernel: [101572.158408] [<ffffffff814b491b>]
_raw_spin_lock+0x36/0x69
Dec 24 17:07:07 i kernel: [101572.158421] [<ffffffffa0161c41>] ?
btrfs_tree_lock+0x59/0xb8 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158434] [<ffffffffa0161c41>]
btrfs_tree_lock+0x59/0xb8 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158447] [<ffffffffa0161afe>] ?
btrfs_wake_function+0x0/0x15 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158458] [<ffffffffa012c461>]
do_walk_down+0x103/0x39e [btrfs]
Dec 24 17:07:07 i kernel: [101572.158461] [<ffffffff8107533e>] ?
local_clock+0x36/0x4d
Dec 24 17:07:07 i kernel: [101572.158464] [<ffffffff81083266>] ?
lock_release+0x198/0x1a4
Dec 24 17:07:07 i kernel: [101572.158474] [<ffffffffa012c784>]
walk_down_tree+0x88/0xb2 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158485] [<ffffffffa012e84e>]
btrfs_drop_snapshot+0x2ae/0x456 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158488] [<ffffffff814b388d>] ?
__mutex_unlock_slowpath+0x11d/0x125
Dec 24 17:07:07 i kernel: [101572.158500] [<ffffffffa0139fa3>]
btrfs_clean_old_snapshots+0x10e/0x12b [btrfs]
Dec 24 17:07:07 i kernel: [101572.158511] [<ffffffffa01345c0>] ?
cleaner_kthread+0xd8/0x164 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158522] [<ffffffffa01345d4>]
cleaner_kthread+0xec/0x164 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158533] [<ffffffffa01344e8>] ?
cleaner_kthread+0x0/0x164 [btrfs]
Dec 24 17:07:07 i kernel: [101572.158537] [<ffffffff8106f256>]
kthread+0xa0/0xa8
Dec 24 17:07:07 i kernel: [101572.158540] [<ffffffff81083759>] ?
trace_hardirqs_on_caller+0x10b/0x12f
Dec 24 17:07:07 i kernel: [101572.158543] [<ffffffff8100bb24>]
kernel_thread_helper+0x4/0x10
Dec 24 17:07:07 i kernel: [101572.158546] [<ffffffff814b5690>] ?
restore_args+0x0/0x30
Dec 24 17:07:07 i kernel: [101572.158549] [<ffffffff8106f1b6>] ?
kthread+0x0/0xa8
Dec 24 17:07:07 i kernel: [101572.158552] [<ffffffff8100bb20>] ?
kernel_thread_helper+0x0/0x10
Dec 24 17:07:07 i kernel: [101572.158554] ---[ end trace c0cc2fba262037cf ]---
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