LOR: ufs vs bufwait
Ulrich Spörlein
uqs at spoerlein.net
Sat May 8 17:48:41 UTC 2010
On Sat, 08.05.2010 at 18:00:50 +0200, Attilio Rao wrote:
> 2010/5/8 Ulrich Spörlein <uqs at spoerlein.net>:
> > On Sat, 08.05.2010 at 12:20:05 +0200, Ulrich Spörlein wrote:
> >> This LOR also is not yet listed on the LOR page, so I guess it's rather
> >> new. I do use SUJ.
> >>
> >> lock order reversal:
> >> 1st 0xc48388d8 ufs (ufs) @ /usr/src/sys/kern/vfs_lookup.c:502
> >> 2nd 0xec0fe304 bufwait (bufwait) @ /usr/src/sys/ufs/ffs/ffs_softdep.c:11363
> >> 3rd 0xc49e56b8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2091
> >> KDB: stack backtrace:
> >> db_trace_self_wrapper(c09394fe,fb817308,c062e515,c061e8ab,c093c4f1,...) at db_trace_self_wrapper+0x26
> >> kdb_backtrace(c061e8ab,c093c4f1,c418b168,c418ef28,fb817364,...) at kdb_backtrace+0x29
> >> _witness_debugger(c093c4f1,c49e56b8,c092e785,c418ef28,c094369d,...) at _witness_debugger+0x25
> >> witness_checkorder(c49e56b8,9,c094369d,82b,0,...) at witness_checkorder+0x839
> >> __lockmgr_args(c49e56b8,80100,c49e56d8,0,0,...) at __lockmgr_args+0x7f9
> >> ffs_lock(fb817488,c062e2bb,c0942b3f,80100,c49e5660,...) at ffs_lock+0x82
> >> VOP_LOCK1_APV(c09bd600,fb817488,c4827cd4,c09d62a0,c49e5660,...) at VOP_LOCK1_APV+0xb5
> >> _vn_lock(c49e5660,80100,c094369d,82b,4,...) at _vn_lock+0x5e
> >> vget(c49e5660,80100,c4827c30,50,0,...) at vget+0xb9
> >> vfs_hash_get(c47bea20,b803,80000,c4827c30,fb8175d8,...) at vfs_hash_get+0xe6
> >> ffs_vgetf(c47bea20,b803,80000,fb8175d8,1,...) at ffs_vgetf+0x49
> >> softdep_sync_metadata(c4838880,0,c0962957,144,0,...) at softdep_sync_metadata+0xc82
> >> ffs_syncvnode(c4838880,1,c4827c30,fb817698,246,...) at ffs_syncvnode+0x3e2
> >> ffs_truncate(c4838880,200,0,880,c41fb480,...) at ffs_truncate+0x862
> >> ufs_direnter(c4838880,c49e5660,fb81794c,fb817bd4,0,...) at ufs_direnter+0x8d4
> >> ufs_makeinode(fb817bd4,0,fb817b30,fb817a94,c08e4cf5,...) at ufs_makeinode+0x517
> >> ufs_create(fb817b30,fb817b48,0,0,fb817ba8,...) at ufs_create+0x30
> >> VOP_CREATE_APV(c09bd600,fb817b30,2,fb817ac0,0,...) at VOP_CREATE_APV+0xa5
> >> vn_open_cred(fb817ba8,fb817c5c,1a4,0,c41fb480,...) at vn_open_cred+0x1de
> >> vn_open(fb817ba8,fb817c5c,1a4,c47e2428,0,...) at vn_open+0x3b
> >> kern_openat(c4827c30,ffffff9c,804c5e8,0,602,...) at kern_openat+0x125
> >> kern_open(c4827c30,804c5e8,0,601,21b6,...) at kern_open+0x35
> >> open(c4827c30,fb817cf8,c0972725,c091f062,c47ea2a8,...) at open+0x30
> >> syscall(fb817d38) at syscall+0x220
> >> Xint0x80_syscall() at Xint0x80_syscall+0x20
> >> --- syscall (5, FreeBSD ELF32, open), eip = 0x2817bf33, esp = 0xbfbfec4c, ebp = 0xbfbfecb8 ---
> >
> > And now the system is hanging again. While I can still ping and receive
> > dmesg updates (eg. USB ports appearing), I/O is frozen solid. This is
> > during portupgrade, when the configure script runs and usually takes 1-2
> > minutes to provoke.
> >
> > This part looks supsicious to me:
> >
> > db> show alllocks
> > Process 28014 (mkdir) thread 0xc691ac30 (100152)
> > exclusive lockmgr bufwait (bufwait) r = 0 (0xec2bdaf0) locked @ /usr/src/sys/ufs/ffs/ffs_softdep.c:10684
> > exclusive lockmgr ufs (ufs) r = 0 (0xc6bcd5a8) locked @ /usr/src/sys/kern/vfs_subr.c:2091
> > exclusive lockmgr bufwait (bufwait) r = 0 (0xec2983f4) locked @ /usr/src/sys/ufs/ffs/ffs_softdep.c:11363
> > exclusive lockmgr ufs (ufs) r = 0 (0xc6d976b8) locked @ /usr/src/sys/kern/vfs_lookup.c:502
> > Process 1990 (sshd) thread 0xc5462750 (100117)
> > exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xc546e08c) locked @ /usr/src/sys/kern/uipc_sockbuf.c:148
> > Process 12 (intr) thread 0xc41f4750 (100004)
> > exclusive sleep mutex ttymtx (ttymtx) r = 0 (0xc425ae04) locked @ /usr/src/sys/dev/dcons/dcons_os.c:232
> > db>
>
> Along with show alllocks may you also get the following from DDB:
> ps, show pcpu, alltrace, lockedvnods.
1. a kernel before SUJ went in is running fine with SU only
2. the following is on a recent -CURRENT that has SUJ, *but* i've
disabled it, so it is running with soft-updates only (I hope)
I ran a portupgrade and the first configure script triggered the I/O
hang
db> ps
pid ppid pgrp uid state wmesg wchan cmd
13467 13444 12937 0 R+ mkdir
13444 13204 12937 0 S+ wait 0xc54352a8 sh
13204 13035 12937 0 S+ wait 0xc5436000 sh
13035 12937 12937 0 S+ wait 0xc4ffad48 sh
12937 12936 12937 0 Ss+ wait 0xc4ff9d48 make
12936 3722 3722 0 R+ script
3722 2021 3722 0 S+ (threaded) ruby18
100132 S wait 0xc4ffa7f8 ruby18
2404 2007 2404 1000 Ss+ ttyin 0xc4d74870 zsh
2325 2015 2325 1000 R+ top
2021 2009 2021 0 S+ pause 0xc4ff9058 csh
2015 2007 2015 1000 Ss+ pause 0xc4ffa058 zsh
2009 2007 2009 1000 Ss+ pause 0xc4d4e850 zsh
2007 2006 2007 1000 Rs screen
2006 1991 2006 1000 R+ screen
2005 2001 2005 0 R+ systat
2001 1976 2001 0 S+ pause 0xc3d52058 csh
2000 1 2000 0 Ss select 0xc3d5b1a4 ssh-agent
1991 1990 1991 1000 Ss+ pause 0xc3d52850 zsh
1990 1986 1986 1000 S select 0xc3d5aca4 sshd
1989 1 1989 1000 Ss select 0xc3d5ae24 ssh-agent
1986 1884 1986 0 Ss sbwait 0xc4f2058c sshd
1985 1 1985 0 Ss+ ttyin 0xc3e62670 getty
1984 1 1984 0 Ss+ ttyin 0xc3e61c70 getty
1983 1 1983 0 Ss+ ttyin 0xc3e60070 getty
1982 1 1982 0 Ss+ ttyin 0xc3e60a70 getty
1981 1 1981 0 Ss+ ttyin 0xc3da7a70 getty
1980 1 1980 0 Ss+ ttyin 0xc3da7c70 getty
1979 1 1979 0 Ss+ ttyin 0xc3e60c70 getty
1976 1 1976 0 Ss+ wait 0xc4c392a8 login
1955 1 1955 0 Rs bsnmpd
1931 1 1931 0 Ss select 0xc4d0f164 inetd
1890 1 1890 0 Rs cron
1884 1 1884 0 Ss select 0xc4d0eda4 sshd
1808 1 1808 0 Rs sendmail
1764 1 1764 0 Rs moused
1754 1 1754 0 Ss (threaded) nslcd
100111 S accept 0xc4d076ae nslcd
100110 S accept 0xc4d076ae nslcd
100109 S accept 0xc4d076ae nslcd
100108 S accept 0xc4d076ae nslcd
100107 S accept 0xc4d076ae nslcd
100076 S uwait 0xc4493180 nslcd
1748 1 1748 0 Rs openvpn
1724 1 1724 201 Ss accept 0xc4d07b82 privoxy
1672 1 1672 0 Rs powerd
1664 1 1664 0 Rs ntpd
1658 1 1658 0 Ss (threaded) nscd
100094 S kqread 0xc4cf1700 nscd
100093 S kqread 0xc4cf1700 nscd
100092 S kqread 0xc4cf1700 nscd
100091 S kqread 0xc4cf1700 nscd
100090 S kqread 0xc4cf1700 nscd
100089 S kqread 0xc4cf1700 nscd
100088 S kqread 0xc4cf1700 nscd
100087 S kqread 0xc4cf1700 nscd
100075 S uwait 0xc449f680 nscd
1576 1 1576 389 Ss (threaded) slapd
100115 S ucond 0xc4cf2700 slapd
100086 S ucond 0xc4cf2600 slapd
100085 S select 0xc4d0eea4 slapd
100073 S uwait 0xc42a9580 slapd
1563 1 1562 0 S nanslp 0xc09f3864 smartd
1526 1 1526 0 Rs rpc.statd
1445 1 1445 0 Rs amd
1418 1 1418 0 Rs rpcbind
1403 1 1403 53 Ss (threaded) named
100084 S kqread 0xc4cdcb80 named
100083 S ucond 0xc4260b00 named
100082 S ucond 0xc449fb80 named
100074 S sigwait 0xfb4b8be0 named
1306 1 1306 0 Rs syslogd
997 0 0 0 RL [pfpurge]
973 1 973 0 Ss select 0xc41eb0a4 devd
964 1 964 65 Ss select 0xc44ac524 dhclient
942 1 942 0 Ss select 0xc426f424 dhclient
856 1 856 0 Ss select 0xc41eb424 moused
561 1 561 0 Ss select 0xc44acde4 wpa_supplicant
150 1 150 0 Ss pause 0xc42ec850 adjkerntz
95 0 0 0 DL mdwait 0xc426a000 [md0]
74 0 0 0 DL geli:w 0xc4265400 [g_eli[0] ad0s4f]
22 0 0 0 RL [softdepflush]
21 0 0 0 RL [syncer]
20 0 0 0 RL [vnlru]
19 0 0 0 RL [bufdaemon]
18 0 0 0 RL [pagezero]
17 0 0 0 DL psleep 0xc0b769d8 [vmdaemon]
16 0 0 0 RL [pagedaemon]
9 0 0 0 DL ccb_scan 0xc09d78d4 [xpt_thrd]
15 0 0 0 DL tzpoll 0xc09dafcc [acpi_thermal]
8 0 0 0 SL - 0xc3f55000 [fw0_probe]
7 0 0 0 DL - 0xc3ebd3bc [cbb0 event thread]
14 0 0 0 DL (threaded) [usb]
100040 D - 0xc3f39d0c [usbus3]
100039 D - 0xc3f39cdc [usbus3]
100038 D - 0xc3f39cac [usbus3]
100037 D - 0xc3f39c7c [usbus3]
100036 D - 0xc3f1fdac [usbus2]
100035 D - 0xc3f1fd7c [usbus2]
100034 D - 0xc3f1fd4c [usbus2]
100033 D - 0xc3f1fd1c [usbus2]
100032 D - 0xc3f0ddac [usbus1]
100031 D - 0xc3f0dd7c [usbus1]
100030 D - 0xc3f0dd4c [usbus1]
100029 D - 0xc3f0dd1c [usbus1]
100028 D - 0xc3ef7dac [usbus0]
100027 D - 0xc3ef7d7c [usbus0]
100026 D - 0xc3ef7d4c [usbus0]
100025 D - 0xc3ef7d1c [usbus0]
6 0 0 0 DL crypto_r 0xc0b7446c [crypto returns]
5 0 0 0 DL crypto_w 0xc0b74448 [crypto]
13 0 0 0 DL - 0xc09f36c4 [yarrow]
4 0 0 0 DL - 0xc09f13e4 [g_down]
3 0 0 0 DL - 0xc09f13e0 [g_up]
2 0 0 0 RL [g_event]
12 0 0 0 RL (threaded) [intr]
100049 I [irq12: psm0]
100048 I [irq1: atkbd0]
100046 I [irq15: ata1]
100045 I [irq14: ata0]
100024 I [irq11: cbb0 bfe0++*]
100023 I [irq9: pcm0 iwi0+]
100022 I [swi6: Giant taskq]
100020 I [swi5: +]
100019 I [swi2: cambio]
100014 I [swi6: task queue]
100006 I [swi3: vm]
100005 Run CPU 0 [swi4: clock]
100004 I [swi1: netisr 0]
11 0 0 0 RL [idle: cpu0]
1 0 1 0 SLs wait 0xc3df2d48 [init]
10 0 0 0 DL audit_wo 0xc0b747e0 [audit]
0 0 0 0 RLs (threaded) [kernel]
100050 D deadlkre 0xc09f36c4 [deadlkres]
100044 D - 0xc3f5db80 [iwi0 taskq]
100042 D - 0xc3f5e8c0 [fw0_taskq]
100021 D - 0xc3ea08c0 [thread taskq]
100018 D - 0xc3ea0a80 [kqueue taskq]
100017 D - 0xc3ea0c40 [acpi_task_2]
100016 D - 0xc3ea0c40 [acpi_task_1]
100015 D - 0xc3ea0c40 [acpi_task_0]
100010 D - 0xc3dda9c0 [firmware taskq]
100000 RunQ [swapper]
1999 1976 1976 0 Z+ ssh-agent
1988 1986 1986 1000 Z ssh-agent
db> show alllocks
Process 13467 (mkdir) thread 0xc543b270 (100150)
exclusive lockmgr bufwait (bufwait) r = 0 (0xebd1f8ec) locked @ /usr/src/sys/kern/vfs_bio.c:2581
exclusive lockmgr ufs (ufs) r = 0 (0xc542fc08) locked @ /usr/src/sys/kern/vfs_subr.c:2091
exclusive lockmgr bufwait (bufwait) r = 0 (0xebd15194) locked @ /usr/src/sys/ufs/ffs/ffs_softdep.c:11363
exclusive lockmgr ufs (ufs) r = 0 (0xc54279e8) locked @ /usr/src/sys/kern/vfs_lookup.c:502
Process 1986 (sshd) thread 0xc4d2ec30 (100113)
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xc4f20560) locked @ /usr/src/sys/kern/uipc_sockbuf.c:148
Process 22 (softdepflush) thread 0xc428f750 (100058)
exclusive sleep mutex struct mount mtx (struct mount mtx) r = 0 (0xc42a3a20) locked @ /usr/src/sys/kern/vfs_subr.c:341
Process 12 (intr) thread 0xc3df44e0 (100005)
exclusive sleep mutex ttymtx (ttymtx) r = 0 (0xc3e63604) locked @ /usr/src/sys/dev/dcons/dcons_os.c:232
db> show pcpu
cpuid = 0
dynamic pcpu = 0x64e400
curthread = 0xc3df44e0: pid 12 "swi4: clock"
curpcb = 0xc3bfbd90
fpcurthread = none
idlethread = 0xc3df49c0: pid 11 "idle: cpu0"
APIC ID = 0
currentldt = 0x50
spin locks held:
db> show lockedvnods
Locked vnodes
0xc5427990: tag ufs, type VDIR
usecount 5, writecount 0, refcount 7 mountedhere 0
flags ()
v_object 0xc54224c8 ref 0 pages 0
lock type ufs: EXCL by thread 0xc543b270 (pid 13467)
ino 11375831, on dev ad0s4f.eli
0xc542fbb0: tag ufs, type VREG
usecount 2, writecount 0, refcount 5 mountedhere 0
flags ()
v_object 0xc5422880 ref 0 pages 7
lock type ufs: EXCL by thread 0xc543b270 (pid 13467)
ino 11375884, on dev ad0s4f.eli
db> alltrace
Tracing command mkdir pid 13467 tid 100150 td 0xc543b270
sched_switch(c543b270,0,104,191,f614b28d,...) at sched_switch+0x36a
mi_switch(104,0,c093a853,1eb,4c,...) at mi_switch+0x200
sleepq_switch(c543b270,0,c093a853,260,0,...) at sleepq_switch+0x15f
sleepq_wait(ebd1f88c,4c,c0941795,0,0,...) at sleepq_wait+0x63
_sleep(ebd1f88c,c3da14ac,4c,c0941795,0,...) at _sleep+0x365
bwait(ebd1f88c,4c,c0941795,ebd1f88c,fb5d5584,...) at bwait+0x6f
bufwait(ebd1f88c,ebd1f88c,0,ebd1f88c,c54165e4,...) at bufwait+0x48
bufwrite(ebd1f88c,0,c09625e3,74d,0) at bufwrite+0x165
ffs_bufwrite(ebd1f88c,c542d500,100,4000,0,...) at ffs_bufwrite+0x290
ffs_update(c542fbb0,1,80000,fb5d567c,1,...) at ffs_update+0x27c
softdep_sync_metadata(c5427990,0,c0962b76,144,0,...) at softdep_sync_metadata+0xc9f
ffs_syncvnode(c5427990,1,c543b270,fb5d573c,246,...) at ffs_syncvnode+0x3e2
ffs_truncate(c5427990,400,0,880,c4c4f680,...) at ffs_truncate+0x862
ufs_direnter(c5427990,c542f660,fb5d5a1c,fb5d5c00,ebd2a930,...) at ufs_direnter+0x8d4
ufs_mkdir(fb5d5c28,fb5d5c3c,0,fb5d5bd4,fb5d5b6c,...) at ufs_mkdir+0x81f
VOP_MKDIR_APV(c09bd840,fb5d5c28,68,fb5d5bc0,0,...) at VOP_MKDIR_APV+0xa5
kern_mkdirat(c543b270,ffffff9c,bfbfeaa2,0,1ff,...) at kern_mkdirat+0x211
kern_mkdir(c543b270,bfbfeaa2,0,1ff,fb5d5d2c,...) at kern_mkdir+0x2e
mkdir(c543b270,fb5d5cf8,c,c,c5434aa0,...) at mkdir+0x29
syscall(fb5d5d38) at syscall+0x220
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (136, FreeBSD ELF32, mkdir), eip = 0x28178ef3, esp = 0xbfbfe7ec, ebp = 0xbfbfe8b8 ---
Tracing command sh pid 13444 tid 100147 td 0xc4fff9c0
sched_switch(c4fff9c0,0,104,191,f5d80613,...) at sched_switch+0x36a
mi_switch(104,0,c093a853,1eb,5c,...) at mi_switch+0x200
sleepq_switch(c4fff9c0,0,c093a853,1a0,5c,...) at sleepq_switch+0x15f
sleepq_catch_signals(c093a853,160,0,100,100,...) at sleepq_catch_signals+0xb7
sleepq_wait_sig(c54352a8,5c,c093d112,100,0,...) at sleepq_wait_sig+0x17
_sleep(c54352a8,c5435330,15c,c093d112,0,...) at _sleep+0x34e
kern_wait(c4fff9c0,ffffffff,fb5ccc74,2,0,...) at kern_wait+0xb76
wait4(c4fff9c0,fb5cccf8,c0972944,c093d0f1,c54352a8,...) at wait4+0x3d
syscall(fb5ccd38) at syscall+0x220
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (7, FreeBSD ELF32, wait4), eip = 0x281681eb, esp = 0xbfbfe5bc, ebp = 0xbfbfe5d8 ---
<snip>
I hope you don't really need all of the traces, I'll keep the system at
the DDB prompt for now, so I can do other stuff.
Regards,
Uli
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