[Bug 236220] ZFS vnode deadlock on zfs_mknode

Mon Mar 4 21:53:49 UTC 2019

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236220

--- Comment #6 from ncrogers at gmail.com ---
(In reply to Andriy Gapon from comment #5)
I thought I had that in Comment #2. Here it is again.

(kgdb) tid 100527
(kgdb) bt
#0  sched_switch (td=0xfffff8026af9d580, newtd=0xfffff80003551000,
flags=<optimized out>) at /usr/src/sys/kern/sched_ule.c:2112
#1  0xffffffff80d0e0a1 in mi_switch (flags=<optimized out>, newtd=0x0) at
/usr/src/sys/kern/kern_synch.c:439
#2  0xffffffff80d5c80c in sleepq_wait (wchan=<unavailable>, pri=<unavailable>)
at /usr/src/sys/kern/subr_sleepqueue.c:692
#3  0xffffffff80cd9105 in sleeplk (lk=0xfffff802f256c248, flags=<optimized
out>, ilk=<optimized out>, wmesg=<optimized out>, pri=<optimized out>, timo=51,
queue=0)
    at /usr/src/sys/kern/kern_lock.c:300
#4  0xffffffff80cd819c in lockmgr_xlock_hard (lk=0xfffff802f256c248,
flags=525312, ilk=0xfffff802f256c278, file=<optimized out>, line=<optimized
out>, lwa=<optimized out>)
    at /usr/src/sys/kern/kern_lock.c:822
#5  0xffffffff813acc5e in VOP_LOCK1_APV (vop=<optimized out>,
a=0xfffffe008e36b280) at vnode_if.c:2087
#6  0xffffffff80de2820 in VOP_LOCK1 (vp=0xfffff802f256c1e0, flags=525312,
file=0xffffffff813c47d0
"/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c", 
    line=730) at ./vnode_if.h:859
#7  _vn_lock (vp=0xfffff802f256c1e0, flags=525312, file=0xffffffff813c47d0
"/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c",
line=730)
    at /usr/src/sys/kern/vfs_vnops.c:1533
#8  0xffffffff804ae1f4 in zfs_znode_alloc (zfsvfs=<optimized out>,
db=<optimized out>, blksz=0, obj_type=<optimized out>, hdl=<optimized out>)
    at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c:730
#9  0xffffffff804adc0d in zfs_mknode (dzp=0xfffff802f461f440,
vap=0xfffffe008e36b6e0, tx=<optimized out>, cr=0xfffff8002b529b00,
flag=<optimized out>, 
    zpp=0xfffffe008e36b638, acl_ids=0xfffffe008e36b5f8) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c:988
#10 0xffffffff804a4d32 in zfs_create (excl=0, mode=0, dvp=<optimized out>,
name=<optimized out>, vap=<optimized out>, vpp=<optimized out>, cr=<optimized
out>, 
    td=<optimized out>) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c:1883
#11 zfs_freebsd_create (ap=0xfffffe008e36b790) at
/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c:4996
#12 0xffffffff813aaa68 in VOP_CREATE_APV (vop=<optimized out>,
a=0xfffffe008e36b790) at vnode_if.c:263
#13 0xffffffff80de20f9 in VOP_CREATE (dvp=<unavailable>,
vpp=0xfffffe008e36b888, cnp=<optimized out>, vap=0x18000000001) at
./vnode_if.h:109
#14 vn_open_cred (ndp=0xfffffe008e36b828, flagp=0xfffffe008e36b954,
cmode=<optimized out>, vn_open_flags=<optimized out>, cred=0xfffff8002b529b00,
fp=0xfffff8026d933d70)
    at /usr/src/sys/kern/vfs_vnops.c:243
#15 0xffffffff80dda74c in kern_openat (td=0xfffff8026af9d580, fd=-100,
path=0x7fffffffc630 <error: Cannot access memory at address 0x7fffffffc630>,
pathseg=UIO_USERSPACE, 
    flags=1538, mode=<optimized out>) at /usr/src/sys/kern/vfs_syscalls.c:1082
#16 0xffffffff81222449 in syscallenter (td=<optimized out>) at
/usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:135
#17 amd64_syscall (td=0xfffff8026af9d580, traced=0) at
/usr/src/sys/amd64/amd64/trap.c:1076
#18 <signal handler called>
#19 0x000000080138b4fa in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffc138
(kgdb) fr 7
#7  _vn_lock (vp=0xfffff802f256c1e0, flags=525312, file=0xffffffff813c47d0
"/usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c",
line=730)
    at /usr/src/sys/kern/vfs_vnops.c:1533
warning: Source file is more recent than executable.
1533            error = VOP_LOCK1(vp, flags, file, line);
(kgdb) print *vp
$1 = {v_tag = 0xffffffff8144af45 "zfs", v_op = 0xffffffff81c64fd0
<zfs_vnodeops>, v_data = 0xfffff802608c3440, v_mount = 0x0, v_nmntvnodes =
{tqe_next = 0xfffff8037a047000, 
    tqe_prev = 0xfffff802f23feb60}, {v_mountedhere = 0x0, v_unpcb = 0x0, v_rdev
= 0x0, v_fifoinfo = 0x0}, v_hashlist = {le_next = 0x0, le_prev = 0x0},
v_cache_src = {
    lh_first = 0x0}, v_cache_dst = {tqh_first = 0x0, tqh_last =
0xfffff802f256c230}, v_cache_dd = 0x0, v_lock = {lock_object = {lo_name =
0xffffffff8144af45 "zfs", 
      lo_flags = 117112840, lo_data = 0, lo_witness = 0x0}, lk_lock =
18446744073709551605, lk_exslpfail = 0, lk_timo = 51, lk_pri = 96}, v_interlock
= {lock_object = {
      lo_name = 0xffffffff814e4508 "vnode interlock", lo_flags = 16973824,
lo_data = 0, lo_witness = 0x0}, mtx_lock = 0}, v_vnlock = 0xfffff802f256c248,
v_actfreelist = {
    tqe_next = 0xfffff8037a047000, tqe_prev = 0xfffff80011333a38}, v_bufobj =
{bo_lock = {lock_object = {lo_name = 0xffffffff814a9e5f "bufobj interlock", 
        lo_flags = 86179840, lo_data = 0, lo_witness = 0x0}, rw_lock = 1},
bo_ops = 0xffffffff81d38600 <buf_ops_bio>, bo_object = 0x0, bo_synclist =
{le_next = 0x0, 
      le_prev = 0x0}, bo_private = 0xfffff802f256c1e0, bo_clean = {bv_hd =
{tqh_first = 0x0, tqh_last = 0xfffff802f256c2f8}, bv_root = {pt_root = 0},
bv_cnt = 0}, 
    bo_dirty = {bv_hd = {tqh_first = 0x0, tqh_last = 0xfffff802f256c318},
bv_root = {pt_root = 0}, bv_cnt = 0}, bo_numoutput = 0, bo_flag = 0, bo_domain
= 1, 
    bo_bsize = 16384}, v_pollinfo = 0x0, v_label = 0x0, v_lockf = 0x0, v_rl =
{rl_waiters = {tqh_first = 0x0, tqh_last = 0xfffff802f256c368}, rl_currdep =
0x0}, 
  v_cstart = 0, v_lasta = 0, v_lastw = 0, v_clen = 0, v_holdcnt = 1, v_usecount
= 1, v_iflag = 0, v_vflag = 0, v_mflag = 0, v_writecount = 0, v_hash =
49436353, 
  v_type = VREG}
(kgdb)

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