On Thu, 11 Feb 2016, John D. Baker wrote:
> One thing I think I should check is to get the client stuck and try to
> umount an NFS file system without deliberately sabotaging the attempt
> (i.e., don't make it PWD before umount). I expect it will get stuck
> as well.
Confirmed. Attempting to unmount a non-busy "hard" NFS mount gets stuck.
'crash' excerpt:
PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
3174 1 3 0 0 c3149d40 umount tstile
2914 1 3 0 0 c2acf2a0 amd tstile
558 27 3 0 0 c29fbaa0 DOM Worker tstile
0 50 3 0 200 c1806540 ioflush tstile
crash> show proc/a c3149d40
lwp_t c3149d40
umount: pid 3174 proc c1cdb87c vmspace/map c1904354 flags 4000
lwp 1 c3149d40 pcb da066000
stat 3 flags 0 cpu 0 pri 43
wmesg tstile wchan c1b54024
crash> bt/a c3149d40
trace: pid 3174 lid 1 at 0xda067e3c
sleepq_block(0,0,c073bc98,c0834220,40,c1374d01,c3149d40,c2acf2a2,c2980d04,c1b540
24) at sleepq_block+0x8f
turnstile_block(c2980d04,1,c1b54024,c0834220,1,0,0,0,0,0) at turnstile_block+0x1
f8
mutex_vector_enter(c1b54024,c1b54000,0,164,da067f20,c0593630,c1b54000,da067f10,d
a067f10,560164e3) at mutex_vector_enter+0x206
vfs_busy(c1b54000,da067f10,da067f10,560164e3,0,c1cdb87c,0,c1f02000,0,d) at vfs_b
usy+0x17
do_sys_getvfsstat(c3149d40,0,0,2,c01007d0,8b4,da067f60,da067f9c,c04d4b3f,c3149d4
0) at do_sys_getvfsstat+0x96
sys_getvfsstat(c3149d40,da067f68,da067f60,c0832ff0,da067f68,0,0,0,0,2) at sys_ge
tvfsstat+0x3f
syscall() at syscall+0x7f
--- syscall (number 356) ---
bbb04297:
crash> show proc/a c2acf2a0
lwp_t c2acf2a0
amd: pid 2914 proc c1cdb6cc vmspace/map c16f61a8 flags 0
lwp 1 c2acf2a0 pcb da390000
stat 3 flags 0 cpu 0 pri 43
wmesg tstile wchan c284a998
crash> bt/a c2acf2a0
trace: pid 2914 lid 1 at 0xda391d10
sleepq_block(0,0,c073bc98,c083463c,40,c1374101,c2acf2a0,0,0,c284a998) at sleepq_
block+0x8f
turnstile_block(0,1,c284a998,c083463c,c084cb34,da391da0,1,0,0,0) at turnstile_bl
ock+0x1f8
rw_vector_enter(c284a998,1,1,0,c284a998,c284a8f4,c284a8f4,da391e4c,da391dfc,c05a
8f9e) at rw_vector_enter+0x128
genfs_lock(da391dec,ffffffff,c2dc7dc0,c070c6ec,c284a8f4,2,2,da391e14,c0599e74,c2
84a8f4) at genfs_lock+0x87
VOP_LOCK(c284a8f4,2,c284a8f4,c284a8f4,da391e2c,c0598cff,c284a8f4,2,64b8c5,c284a8
f4) at VOP_LOCK+0x50
vn_lock(c284a8f4,2,64b8c5,c284a8f4,da391e60,c058d541,c284a8f4,c058cc40,da391e4c,
1b) at vn_lock+0x1a
vrecycle(c284a8f4,c058cc40,da391e4c,1b,0,c2909b04,c2909bb4,0,c1f35e00,c2909bb4)
a
t vrecycle+0x1b
vflush(c1b54000,c2909bb4,0,c1b54000,c2acf2a0,c1b54000,c1b54024,0,da391e9c,c058ff
a8) at vflush+0x8d
nfs_unmount(c1b54000,0,c1b54000,da391ed0,c058dba4,c1b54000,0,c137af00,0,8) at nf
s_unmount+0xd0
VFS_UNMOUNT(c1b54000,0,c137af00,0,8,8,c1b54900,1,da391f68,c1b54000) at VFS_UNMOU
NT+0x26
dounmount(c1b54000,0,c2acf2a0,c1b54000,0,0,c2acf2a0,c2962410,0,c2962410) at doun
mount+0xb3
sys_unmount(c2acf2a0,da391f68,da391f60,c0832048,da391f68,0,0,bb609400,0,200246)
a
t sys_unmount+0x149
syscall() at syscall+0x7f
--- syscall (number 22) ---
bba39c37:
crash> show proc/a c29fbaa0
lwp_t c29fbaa0
firefox: pid 558 proc c18ba368 vmspace/map c1904c70 flags 4001
lwp 27 [DOM Worker] c29fbaa0 pcb da388000
stat 3 flags 0 cpu 0 pri 43
wmesg tstile wchan c1b54024
lwp 26 [IPDL Background] c29fbd40 pcb da386000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 6c23633c
lwp 25 [Cert Verify] c29d2000 pcb da384000
stat 3 flags 80 cpu 0 pri 42
wmesg parked wchan 6f932438
lwp 24 c29d22a0 pcb da382000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 6f93255c
lwp 23 [SoftwareVsyncTh] c29d2540 pcb da380000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 6f041d44
lwp 22 [ImageIO] c29d27e0 pcb da35e000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 6e9fcb7c
lwp 21 [ImgDecoder #1] c29d2a80 pcb da35c000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 6e9fc558
lwp 20 [ImageBridgeChil] c29d2d20 pcb da35a000
stat 3 flags 80 cpu 0 pri 40
wmesg parked wchan 6f644d44
lwp 19 [Compositor] c1853d20 pcb d86a1000
stat 3 flags 80 cpu 0 pri 40
wmesg parked wchan 6e845d44
lwp 18 [GMPThread] c297f020 pcb da358000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 71a2eadc
lwp 16 [Cache2 I/O] c297f560 pcb da354000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 70ad54b8
lwp 15 c297f800 pcb da352000
stat 3 flags 80 cpu 0 pri 43
wmesg kqueue wchan c2911c14
lwp 14 c297faa0 pcb da350000
stat 3 flags 80 cpu 0 pri 43
wmesg select wchan c1368c80
lwp 13 [Timer] c297fd40 pcb da34a000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a0a72b8
lwp 12 [BgHangManager] c2961000 pcb da344000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 72630338
lwp 11 [Hang Monitor] c29612a0 pcb da342000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 72633c98
lwp 10 [JS Watchdog] c2961540 pcb da340000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a012c38
lwp 9 [JS Helper] c29617e0 pcb da33e000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a0a7198
lwp 8 [JS Helper] c2961a80 pcb da33c000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a0a7198
lwp 7 [JS Helper] c2961d20 pcb da33a000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a0a7198
lwp 6 [JS Helper] c1cde020 pcb da338000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a0a7198
lwp 5 [JS Helper] c1cde2c0 pcb da336000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a0a7198
lwp 4 c1cde560 pcb da334000
stat 3 flags 80 cpu 0 pri 43
wmesg parked wchan 7a01daf8
lwp 3 [Socket Thread] c1cde800 pcb d9fdd000
stat 3 flags 80 cpu 0 pri 43
wmesg select wchan c1368c80
lwp 2 [Gecko_IOThread] c1cdeaa0 pcb d9fd7000
stat 3 flags 80 cpu 0 pri 43
wmesg kqueue wchan c2911da4
lwp 1 c1c10540 pcb d8788000
stat 3 flags 0 cpu 0 pri 43
wmesg netio wchan c1afb0ec
crash> bt/a c29fbaa0
trace: pid 558 lid 27 at 0xda389bf0
sleepq_block(0,0,c073bc98,c0834220,40,c1374d01,c29fbaa0,c2acf2a0,0,c1b54024) at
s
leepq_block+0x8f
turnstile_block(0,1,c1b54024,c0834220,58,556e,0,0,0,0) at turnstile_block+0x1f8
mutex_vector_enter(c1b54024,0,c1b54000,1c,da389ce0,c059904a,c1b54000,0,c30c6850,
da389ce8) at mutex_vector_enter+0x206
vfs_busy(c1b54000,0,c30c6850,da389ce8,da389ed4,10c,40,da389cb4,b7ccdd42,da389cb8
) at vfs_busy+0x17
vcache_get(c1b54000,c30c686c,1c,da389cfc,da389ed4,0,da389da4,c03cb03f,c1b54000,c
30c686c) at vcache_get+0x1a0
nfs_nget1(c1b54000,c30c686c,1c,da389d80,0,da389d70,da389d74,da389d68,0,0) at nfs
_nget1+0x26
nfs_create(da389db8,c058c79a,0,c070cb3c,c284a8f4,da389ec0,da389ed4,da389df4,da38
9eac,da389e88) at nfs_create+0xb9c
VOP_CREATE(c284a8f4,da389ec0,da389ed4,da389df4,0,200,c1c54780,1,180,ffffffff) at
VOP_CREATE+0x56
vn_open(da389eac,60a,180,c29fbaa0,180,c342bf40,37,0,c1719860,c1819c00) at vn_ope
n+0x3b9
do_open(c29fbaa0,0,c1719860,609,180,da389f40,0,c1719860,c29fbaa0,da389fa8) at do
_open+0xb5
do_sys_openat(609,180,da389f40,da389fa8,da389f9c,c04d4b3f,c29fbaa0,da389f68,da38
9f60,c0831f7c) at do_sys_openat+0x6f
sys_open(c29fbaa0,da389f68,da389f60,c0831f7c,da389f68,0,0,90e825b0,609,180) at s
ys_open+0x2c
syscall() at syscall+0x7f
--- syscall (number 5) ---
bb973957:
crash> show proc/a c1806540
lwp_t c1806540
system: pid 0 proc c08342a0 vmspace/map c0847760 flags 20002
lwp 50 [ioflush] c1806540 pcb d8647000
stat 3 flags 200 cpu 0 pri 124
wmesg tstile wchan c087d384
lwp 49 [pgdaemon] c18067e0 pcb d8645000
stat 3 flags 200 cpu 0 pri 126
wmesg pgdaemon wchan c0880df4
lwp 46 [nfsio] c16fd020 pcb d863f000
stat 3 flags 200 cpu 0 pri 96
wmesg nfsiod wchan c14d525c
lwp 45 [nfsio] c16fd2c0 pcb d863d000
stat 3 flags 200 cpu 0 pri 96
wmesg nfsiod wchan c14d51e4
lwp 44 [nfsio] c16fd560 pcb d863b000
stat 3 flags 200 cpu 0 pri 96
wmesg nfsiod wchan c14d52ac
lwp 43 [nfsio] c16fd800 pcb d85fc000
stat 3 flags 200 cpu 0 pri 96
wmesg nfsiod wchan c14d52d4
lwp 42 [pfpurge] c1695a80 pcb d8639000
stat 3 flags 200 cpu 0 pri 96
wmesg pftm wchan c03fe9e2
lwp 41 [atapibus0] c16fdaa0 pcb d85fa000
stat 3 flags 200 cpu 0 pri 96
wmesg sccomp wchan c1626328
lwp 38 [usb3] c1695d20 pcb d85f8000
stat 3 flags 200 cpu 0 pri 96
wmesg usbevt wchan c1690218
lwp 37 [usb2] c1503020 pcb d85f6000
stat 3 flags 200 cpu 0 pri 96
wmesg usbevt wchan c14f8234
lwp 36 [usb1] c15032c0 pcb d8635000
stat 3 flags 200 cpu 0 pri 96
wmesg usbevt wchan c1504218
lwp 35 [usb0] c16fdd40 pcb d8633000
stat 3 flags 200 cpu 0 pri 96
wmesg usbevt wchan c1500218
lwp 34 [cryptoret] c16957e0 pcb d85fe000
stat 3 flags 200 cpu 0 pri 96
wmesg crypto_w wchan c0840edc
lwp 33 [unpgc] c16952a0 pcb d8604000
stat 3 flags 200 cpu 0 pri 96
wmesg unpgc wchan c08800e4
lwp 32 [vmem_rehash] c1695000 pcb d8602000
stat 3 flags 200 cpu 0 pri 125
wmesg vmem_rehash wchan c14d0944
lwp 23 [atabus1] c1503560 pcb d7da8000
stat 3 flags 200 cpu 0 pri 96
wmesg atath wchan c1626344
lwp 22 [atabus0] c1503800 pcb d7da6000
stat 3 flags 200 cpu 0 pri 96
wmesg atath wchan c16261e4
lwp 21 [fw0probe] c1503aa0 pcb d7c92000
stat 3 flags 280 cpu 0 pri 96
wmesg ieee1394 wchan c15e3470
lwp 20 [usbtask-dr] c1503d40 pcb d796d000
stat 3 flags 200 cpu 0 pri 96
wmesg usbtsk wchan c08801cc
lwp 19 [usbtask-hc] c14d7000 pcb d796b000
stat 3 flags 200 cpu 0 pri 96
wmesg usbtsk wchan c08801ac
lwp 18 [pms0] c14d72a0 pcb d777d000
stat 3 flags 200 cpu 0 pri 96
wmesg pmsreset wchan c14f6e7c
lwp 17 [apm0] c14d7540 pcb d777b000
stat 3 flags 200 cpu 0 pri 96
wmesg apmev wchan c14fbc40
lwp 16 [sysmon] c14d77e0 pcb d7966000
stat 3 flags 200 cpu 0 pri 96
wmesg smtaskq wchan c087e12c
lwp 15 [pmfsuspend] c14d7a80 pcb d7964000
stat 3 flags 200 cpu 0 pri 43
wmesg pmfsuspend wchan c14d0dc4
lwp 14 [pmfevent] c14d7d20 pcb d7962000
stat 3 flags 200 cpu 0 pri 43
wmesg pmfevent wchan c14d0e84
lwp 13 [sopendfree] c1389020 pcb d7960000
stat 3 flags 200 cpu 0 pri 96
wmesg sopendfr wchan c088009c
lwp 12 [nfssilly] c13892c0 pcb d795e000
stat 3 flags 200 cpu 0 pri 43
wmesg nfssilly wchan c14d0f44
lwp 11 [cachegc] c1389560 pcb d795c000
stat 3 flags 200 cpu 0 pri 125
wmesg cachegc wchan c1389560
lwp 10 [vrele] c1389800 pcb d795a000
stat 3 flags 200 cpu 0 pri 125
wmesg vrele wchan c083f540
lwp 9 [vdrain] c1389aa0 pcb d7958000
stat 3 flags 200 cpu 0 pri 125
wmesg vdrain wchan c083f600
lwp 8 [modunload] c1389d40 pcb d7956000
stat 3 flags 200 cpu 0 pri 125
wmesg mod_unld wchan c0846d64
lwp 7 [xcall/0] c1381000 pcb d7954000
stat 3 flags 200 cpu 0 pri 127
wmesg xcall wchan c082ebf0
lwp 6 [softser/0] c13812a0 pcb d7952000
stat 1 flags 200 cpu 0 pri 223
lwp 5 [softclk/0] c1381540 pcb d7950000
stat 1 flags 200 cpu 0 pri 220
lwp 4 [softbio/0] c13817e0 pcb d78ce000
stat 1 flags 200 cpu 0 pri 221
lwp 3 [softnet/0] c1381a80 pcb d78cc000
stat 1 flags 200 cpu 0 pri 222
lwp 2 [idle/0] c1381d20 pcb d78c8000
stat 1 flags 201 cpu 0 pri 0
lwp 1 [swapper] c0833f60 pcb c09a5000
stat 3 flags 200 cpu 0 pri 125
wmesg uvm wchan c0833f60
crash> bt/a c1806540
trace: pid 0 lid 50 at 0xd8648ec8
sleepq_block(0,0,c073bc98,c0834220,40,c1374d01,c1806540,c2acf2a0,0,c087d384) at
s
leepq_block+0x8f
turnstile_block(0,1,c087d384,c0834220,c1806540,c087d390,0,0,0,0) at turnstile_bl
ock+0x1f8
mutex_vector_enter(c087d384,0,64,c087d390,0,0,0,56be4a0f,0,c1806540) at mutex_ve
ctor_enter+0x206
sched_sync(c1806540,9a4000,9ab000,0,c0100304,0,0,0,0,0) at sched_sync+0x15
I will arrange to repeat with -current (for DIAGNOSTIC) soon. DEBUG and
LOCKDEBUG to follow. A crash dump to follow once the preceeding is tried.
(most convenient host with disk-based swap is the build host, so it'll have
to be finished with everything first).
--
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