214346 – Hang on find(8) in wait channel "ncvn".

Bug 214346 - Hang on find(8) in wait channel "ncvn".

Summary: Hang on find(8) in wait channel "ncvn".

Status:	New

Alias:	None

Product:	Base System
Classification:	Unclassified
Component:	kern (show other bugs)
Version:	CURRENT
Hardware:	Any Any

Importance:	--- Affects Only Me
Assignee:	freebsd-bugs (Nobody)

URL:
Keywords:

Depends on:
Blocks:

Reported:	2016-11-09 06:58 UTC by Peter Wemm
Modified:	2016-11-09 07:13 UTC (History)
CC List:	1 user (show)

See Also:

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Description Peter Wemm freebsd_committer

2016-11-09 06:58:30 UTC

UID PID PPID CPU PRI NI  VSZ  RSS MWCHAN STAT TT     TIME COMMAND
  0 797  773   0  72  0 8364 2160 ncvn   L     -  0:00.00 find -d . -type d
...
kgdb) proc 797
[Switching to thread 671 (Thread 102144)]#0  0xffffffff8082c13b in sched_switch ()
(kgdb) where
#0  0xffffffff8082c13b in sched_switch ()
#1  0xffffffff80803ea2 in mi_switch ()
#2  0xffffffff8085a0f8 in turnstile_wait ()
#3  0xffffffff807db73d in __mtx_lock_sleep ()
#4  0xffffffff808bdb96 in cache_lookup ()
#5  0xffffffff808c2ebc in vfs_cache_lookup ()
#6  0xffffffff80c26347 in VOP_LOOKUP_APV ()
#7  0xffffffff808cd771 in lookup ()
#8  0xffffffff808cce82 in namei ()
#9  0xffffffff808ed2ac in vn_open_cred ()
#10 0xffffffff808e62cc in kern_openat ()
#11 0xffffffff80b79c3e in amd64_syscall ()
#12 0xffffffff80b5cf2b in Xfast_syscall ()

It is believed to be this command:
        tar -xf $WORK/latest.tgz -C $WORK/latest
        cd $WORK/latest
        find -d . -type d | while read dir; do
                mkdir -p ...
        done


Locked vnodes
vnode 0xfffff80f2dd0d588: tag zfs, type VDIR
    usecount 2, writecount 0, refcount 2 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff81244552948 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type zfs: SHARED (count 1)
vnode 0xfffff8068bae1938: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff80fcf4e9108 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff8013273b500 (pid 93262, rm, tid 101138)
tag VT_TMPFS, tmpfs_node 0xfffff80774a2c740, flags 0x0, links 89
	mode 0755, owner 0, group 0, size 5568, status 0xe

vnode 0xfffff815cc735588: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff815be6feb58 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff8013273b500 (pid 93262, rm, tid 101138)
tag VT_TMPFS, tmpfs_node 0xfffff8152c414000, flags 0x0, links 1
	mode 0755, owner 0, group 0, size 0, status 0xe

vnode 0xfffff81317752b10: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 2 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff80e4f60e000 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: SHARED (count 1)
tag VT_TMPFS, tmpfs_node 0xfffff813f27971d0, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 0, status 0x0

vnode 0xfffff81542f983b0: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff805c1f93738 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff803f2673000 (pid 93286, rm, tid 100955)
tag VT_TMPFS, tmpfs_node 0xfffff814ca31fcb0, flags 0x0, links 8
	mode 0755, owner 0, group 0, size 22272, status 0xe

vnode 0xfffff815debc9b10: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff81260967840 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff803f2673000 (pid 93286, rm, tid 100955)
tag VT_TMPFS, tmpfs_node 0xfffff8152a0111d0, flags 0x0, links 1
	mode 0755, owner 0, group 0, size 0, status 0xe

vnode 0xfffff8133cd4ace8: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff806cb1b1c60 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff80821c56a00 (pid 75665, rm, tid 101836)
tag VT_TMPFS, tmpfs_node 0xfffff80fdeed9740, flags 0x0, links 3
	mode 0755, owner 0, group 0, size 1344, status 0x0

vnode 0xfffff811a35ec588: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 2 mountedhere 0
    flags (VI_ACTIVE)
    lock type tmpfs: EXCL by thread 0xfffff80e8911da00 (pid 94436, mkdir, tid 101748)
tag VT_TMPFS, tmpfs_node 0xfffff80b844cd2b8, flags 0x0, links 14
	mode 0755, owner 0, group 0, size 768, status 0x0

vnode 0xfffff815f9ebf000: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 2 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff80d606de210 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: SHARED (count 1)
tag VT_TMPFS, tmpfs_node 0xfffff807f64c1828, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 0, status 0x0

vnode 0xfffff81504e64760: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff813e5c87b58 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff80d9cbcd500 (pid 93252, rm, tid 101272)
tag VT_TMPFS, tmpfs_node 0xfffff809609f7570, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 2432, status 0x0

vnode 0xfffff80a25e8b3b0: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff813bcdf2420 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff80113cf9500 (pid 84663, rm, tid 101938)
tag VT_TMPFS, tmpfs_node 0xfffff80dc97300e8, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 2304, status 0x0

vnode 0xfffff81545f8c588: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff813bcc85b58 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff8018e670000 (pid 80910, rm, tid 101145)
tag VT_TMPFS, tmpfs_node 0xfffff81354c9cd98, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 832, status 0xe

vnode 0xfffff81686abd760: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff812e64e3d68 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff8018e670000 (pid 80910, rm, tid 101145)
tag VT_TMPFS, tmpfs_node 0xfffff811ee66ed98, flags 0x0, links 1
	mode 0755, owner 0, group 0, size 0, status 0xe

vnode 0xfffff8155164d760: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0xfffff8027ebfc6d0
    flags (VI_ACTIVE)
    v_object 0xfffff8155134fa50 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff808c64eca00 (pid 93725, umount, tid 101163)
tag VT_TMPFS, tmpfs_node 0xfffff81551623828, flags 0x800, links 2
	mode 0755, owner 0, group 0, size 0, status 0x0

vnode 0xfffff80d9c2d2b10: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff815abf2b420 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff80534c6e500 (pid 88004, rm, tid 101803)
tag VT_TMPFS, tmpfs_node 0xfffff8131dd782b8, flags 0x0, links 4
	mode 0755, owner 0, group 0, size 768, status 0x0

vnode 0xfffff815461631d8: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0xfffff80e659886d0
    flags (VI_ACTIVE)
    v_object 0xfffff8151418e000 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff801325a2500 (pid 93550, umount, tid 100530)
tag VT_TMPFS, tmpfs_node 0xfffff81551651828, flags 0x800, links 2
	mode 0755, owner 0, group 0, size 0, status 0x0

vnode 0xfffff80ef315b588: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff815283ffa50 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff81260351500 (pid 85122, rm, tid 101838)
tag VT_TMPFS, tmpfs_node 0xfffff80e34f639f8, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 1280, status 0x0

vnode 0xfffff80f2d952b10: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 2 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff80f4b09fd68 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: SHARED (count 1)
tag VT_TMPFS, tmpfs_node 0xfffff8132014b910, flags 0x0, links 2
	mode 0755, owner 9, group 0, size 0, status 0x0

vnode 0xfffff8133cb8c588: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 2 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff80750fec210 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: SHARED (count 1)
tag VT_TMPFS, tmpfs_node 0xfffff813196092b8, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 0, status 0x0

vnode 0xfffff81542b3a760: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0xfffff815516f76d0
    flags (VI_ACTIVE)
    v_object 0xfffff8155110f108 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff808c610f500 (pid 93470, umount, tid 101700)
tag VT_TMPFS, tmpfs_node 0xfffff815515af2b8, flags 0x800, links 2
	mode 0755, owner 0, group 0, size 0, status 0x0

vnode 0xfffff81535455938: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff81528bed420 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff80e89829500 (pid 94243, rm, tid 101616)
tag VT_TMPFS, tmpfs_node 0xfffff808c65021d0, flags 0x0, links 6
	mode 0755, owner 0, group 0, size 1280, status 0xe

vnode 0xfffff806961fb3b0: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff81535b81630 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff80e89829500 (pid 94243, rm, tid 101616)
tag VT_TMPFS, tmpfs_node 0xfffff814753480e8, flags 0x0, links 1
	mode 0775, owner 1000, group 1000, size 0, status 0xe

vnode 0xfffff809cab52b10: tag tmpfs, type VDIR
    usecount 2, writecount 0, refcount 3 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff81535dcd000 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff8135acf8a00 (pid 93039, rm, tid 101276)
tag VT_TMPFS, tmpfs_node 0xfffff811b870f1d0, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 576, status 0xe

vnode 0xfffff815b6f3ace8: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 1 mountedhere 0
    flags (VI_ACTIVE)
    v_object 0xfffff814f9bd7c60 ref 0 pages 0 cleanbuf 0 dirtybuf 0
    lock type tmpfs: EXCL by thread 0xfffff8135acf8a00 (pid 93039, rm, tid 101276)
tag VT_TMPFS, tmpfs_node 0xfffff811803a9d98, flags 0x0, links 1
	mode 0755, owner 0, group 0, size 0, status 0xe

vnode 0xfffff80d9cb5b588: tag tmpfs, type VDIR
    usecount 4, writecount 0, refcount 5 mountedhere 0
    flags (VI_ACTIVE)
    lock type tmpfs: EXCL by thread 0xfffff8013239da00 (pid 14243, pkg-static, tid 102281)
tag VT_TMPFS, tmpfs_node 0xfffff813533d3828, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 192, status 0x0

vnode 0xfffff8153da5b588: tag tmpfs, type VDIR
    usecount 4, writecount 0, refcount 5 mountedhere 0
    flags (VI_ACTIVE)
    lock type tmpfs: EXCL by thread 0xfffff807441ef500 (pid 79723, pkg-static, tid 101991)
tag VT_TMPFS, tmpfs_node 0xfffff80aaf97c828, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 2496, status 0x0

vnode 0xfffff811a33d2b10: tag tmpfs, type VDIR
    usecount 1, writecount 0, refcount 2 mountedhere 0
    flags (VI_ACTIVE)
    lock type tmpfs: EXCL by thread 0xfffff808fa981a00 (pid 81501, pkg-static, tid 101156)
tag VT_TMPFS, tmpfs_node 0xfffff806fe9ebd98, flags 0x0, links 54
	mode 0755, owner 0, group 0, size 7936, status 0x0

vnode 0xfffff813174391d8: tag tmpfs, type VDIR
    usecount 4, writecount 0, refcount 6 mountedhere 0
    flags (VI_ACTIVE)
    lock type tmpfs: EXCL by thread 0xfffff803356b2a00 (pid 83741, pkg-static, tid 102091)
tag VT_TMPFS, tmpfs_node 0xfffff8097dea8740, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 9984, status 0x0

vnode 0xfffff8131db8d588: tag tmpfs, type VDIR
    usecount 4, writecount 0, refcount 5 mountedhere 0
    flags (VI_ACTIVE)
    lock type tmpfs: EXCL by thread 0xfffff801322fd000 (pid 94792, pkg-static, tid 101484)
tag VT_TMPFS, tmpfs_node 0xfffff81002323bc8, flags 0x0, links 2
	mode 0755, owner 0, group 0, size 128, status 0x0

vnode 0xfffff8131880c588: tag tmpfs, type VDIR
    usecount 4, writecount 0, refcount 5 mountedhere 0
    flags (VI_ACTIVE)
    lock type tmpfs: EXCL by thread 0xfffff803bfffd000 (pid 95189, pkg-static, tid 101790)
tag VT_TMPFS, tmpfs_node 0xfffff811e2146000, flags 0x0, links 3
	mode 0755, owner 0, group 0, size 128, status 0x0

12.0-CURRENT #0 r308208: Wed Nov  2 09:55:11 UTC 2016
hw.ncpu: 24