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port-amd64/50969: Xen 4.5 Dom0 7_STABLE/amd64 panic: vrelel: bad ref count in vnddoclear
>Number: 50969
>Category: port-amd64
>Synopsis: Xen 4.5 Dom0 7_STABLE/amd64 panic: vrelel: bad ref count in vnddoclear
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: port-amd64-maintainer
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Mar 15 03:15:00 +0000 2016
>Originator: MOCHIDA Shuji
>Release: 7.0_STABLE Dom0/amd64 of Jan 31, Xen xenkernel45-4.5.2 from pkg
>Organization:
NETside
>Environment:
NetBSD beak 7.0_STABLE NetBSD 7.0_STABLE (RAY_D01-noagp) #0: Mon Feb 1 14:08:17 JST 2016 xxxx@xxx:/xx/obj-kern/amd64-XEN3_DOM0-1.103.2.4/RAY_D01-noagp amd64
>Description:
panic when using MS Windows7/MS Windows 2008 Server R2 DomU(HVM).
vnd related? DomUs use sparse disk image files. (dd with seek=)
panic: vrelel: bad ref count
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff801f18b5 cs e030 rflags 246 cr2 7f7ff70ce790 ilevel 0 rsp ffffa0005ce92850
curlwp 0xffffa00006f00160 pid 3048.1 lowest kstack 0xffffa0005ce902c0
Stopped in pid 3048.1 (vnconfig) at netbsd:breakpoint+0x5: leave
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x13c
vnpanic() at netbsd:vnpanic+0x41
vrelel() at netbsd:vrelel+0x33b
vrevoke() at netbsd:vrevoke+0x84
genfs_revoke() at netbsd:genfs_revoke+0xd
VOP_REVOKE() at netbsd:VOP_REVOKE+0x53
vdevgone() at netbsd:vdevgone+0x4f
vnddoclear() at netbsd:vnddoclear+0xb2
vndioctl() at netbsd:vndioctl+0x54f
layer_bypass() at netbsd:layer_bypass+0xb3
VOP_IOCTL() at netbsd:VOP_IOCTL+0x59
vn_ioctl() at netbsd:vn_ioctl+0xa6
sys_ioctl() at netbsd:sys_ioctl+0x17e
syscall() at netbsd:syscall+0x9a
--- syscall (number 54) ---
7f7ff70ce79a:
ds 2818
es 2860
fs 8
gs 220d
rdi 0
rsi 1
rbp ffffa0005ce92850
rbx 104
rdx 0
rcx 0
rax 1
r8 ffffa0005ce92800
r9 ffffa00006dbd380
r10 ffffa00006f00160
r11 73
r12 ffffffff8090e4d6 ostype+0x2c750
r13 ffffa0005ce92888
r14 e00
r15 23
rip ffffffff801f18b5 breakpoint+0x5
cs e030
rflags 246
rsp ffffa0005ce92850
ss e02b
netbsd:breakpoint+0x5: leave
db> ps
PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
3048 > 1 7 0 0 ffffa00006f00160 vnconfig
1231 1 3 0 0 ffffa00006ecc520 sh netio
1360 1 2 0 0 ffffa00006ee5120 sh
2068 1 2 0 0 ffffa00006ef7980 sh
1294 1 3 0 80 ffffa00006ef7140 smbd select
1988 1 3 0 80 ffffa000073065a0 smbd select
2028 1 3 0 80 ffffa00006f00580 tail kqueue
537 1 3 0 80 ffffa00005d134a0 ssh select
1996 1 3 0 80 ffffa00006e1e920 httpd socket
662 2 3 0 80 ffffa000073069c0 xl netio
662 1 3 0 80 ffffa00007306180 xl select
1201 1 3 0 80 ffffa00006f009a0 zsh ttyraw
1264 1 3 0 80 ffffa00006ecc940 sshd select
878 1 3 0 80 ffffa000049d9a00 sshd select
681 2 3 0 80 ffffa00006ee5540 xl netio
681 1 3 0 80 ffffa00006ef7560 xl parked
495 1 3 0 80 ffffa00006e1e500 smbd select
310 1 3 0 80 ffffa00005d1f8e0 smbd select
1226 1 3 0 80 ffffa00005cec8a0 zsh pause
1960 1 3 0 80 ffffa00005c8d460 sshd select
1819 1 3 0 80 ffffa00005d13080 sshd select
1061 1 3 0 80 ffffa000047a55c0 smbd select
143 1 3 0 80 ffffa000047a51a0 zsh ttyraw
145 1 3 0 80 ffffa000049f6600 sshd select
1548 1 3 0 80 ffffa000047a59e0 sshd select
686 1 3 0 80 ffffa000049d95e0 zsh pause
922 1 3 0 80 ffffa000049d91c0 sshd select
247 1 3 0 80 ffffa00005d138c0 sshd select
870 1 3 0 80 ffffa00004a51660 smbd select
1447 1 3 0 80 ffffa0000461b940 getty ttyraw
890 1 3 0 80 ffffa00005d1f4c0 cron nanoslp
761 1 3 0 80 ffffa00005e344e0 inetd kqueue
947 1 3 0 80 ffffa00005e34900 qmgr kqueue
875 1 3 0 80 ffffa00005d1f0a0 pickup kqueue
1502 1 3 0 80 ffffa00005e340c0 master kqueue
1108 1 3 0 80 ffffa00005cec480 sshd select
415 1 3 0 80 ffffa00005cec060 powerd kqueue
1101 1 3 0 80 ffffa00005c8d040 lpd select
649 2 3 0 80 ffffa00004a78260 xenconsoled netio
649 1 3 0 80 ffffa00004a19620 xenconsoled select
1124 1 3 0 80 ffffa00005c48860 httpd socket
1155 1 3 0 80 ffffa00005c1b000 httpd socket
98 1 3 0 80 ffffa00005c1b420 httpd socket
97 1 3 0 80 ffffa00005c1b840 httpd socket
96 1 3 0 80 ffffa00005bd9360 httpd socket
1141 1 3 0 80 ffffa00005bd9780 httpd socket
1069 1 2 0 0 ffffa00005bd9ba0 xenstored
1086 1 3 0 80 ffffa000059fd760 httpd select
1028 1 3 0 80 ffffa000059fdb80 cannaserver select
1012 1 3 0 80 ffffa0000596b720 smbd select
839 1 3 0 80 ffffa000059f5740 dbus-daemon select
861 1 3 0 80 ffffa000059f5320 smbd select
700 1 3 0 80 ffffa000059f5b60 nmbd pipe_rd
773 1 3 0 80 ffffa00005931700 nmbd select
594 1 2 0 0 ffffa0000596bb40 amd
617 7 3 0 80 ffffa00005c8d880 slapd parked
617 6 3 0 80 ffffa00005c48020 slapd parked
617 5 3 0 80 ffffa00005c48440 slapd parked
617 4 3 0 80 ffffa000059312e0 slapd parked
617 3 3 0 80 ffffa0000596b300 slapd parked
617 2 3 0 80 ffffa0000559f2c0 slapd select
617 1 3 0 80 ffffa0000559d2a0 slapd parked
217 1 3 0 80 ffffa0000559f6e0 rpc.lockd select
331 1 3 0 80 ffffa0000559fb00 rpc.statd select
403 5 3 0 80 ffffa0000559d6c0 slave nfsd
403 4 3 0 80 ffffa0000559dae0 slave nfsd
403 3 3 0 80 ffffa00004a8a280 slave nfsd
403 2 3 0 80 ffffa00004a19a40 slave nfsd
403 1 3 0 80 ffffa00004a8a6a0 master select
383 1 3 0 80 ffffa00004a51240 mountd select
262 1 3 0 80 ffffa00004a37640 rpcbind select
312 1 2 0 0 ffffa00004a78680 syslogd
1 1 3 0 80 ffffa0000461c540 init wait
0 67 3 0 200 ffffa0000730c5c0 xbdb2i51712 xbdb2i51712
0 66 3 0 200 ffffa0000730c9e0 vnd3 vndbp
0 65 3 0 200 ffffa00006ecc100 vnd1 vndbp
0 64 3 0 200 ffffa00006e1e0e0 vnd0 vndbp
0 63 3 0 200 ffffa0000432d4c0 vnd2 vndbp
0 60 3 0 200 ffffa000059fd340 xen_balloon xen_balloon
0 59 3 0 200 ffffa00005931b20 ipmi0 ipmi0
0 58 3 0 200 ffffa00004a8aac0 nfsio nfsiod
0 57 3 0 200 ffffa00004a78aa0 nfsio nfsiod
0 56 3 0 200 ffffa00004a37220 nfsio nfsiod
0 55 3 0 200 ffffa000049f6a20 nfsio nfsiod
0 54 3 0 200 ffffa00004a51a80 physiod physiod
0 53 3 0 200 ffffa00004a37a60 raidio1 raidiow
0 52 3 0 200 ffffa000049f61e0 raid1 rfnodeq
0 51 3 0 200 ffffa00004a19200 raidio0 raidiow
0 50 3 0 200 ffffa0000461e160 raid0 rfnodeq
0 49 3 0 200 ffffa00004788180 aiodoned aiodoned
0 48 3 0 200 ffffa000047885a0 ioflush syncer
0 47 3 0 200 ffffa000047889c0 pgdaemon pgdaemon
0 44 3 0 200 ffffa0000461e580 atapibus0 sccomp
0 41 3 0 200 ffffa000046110e0 usb1 usbevt
0 40 3 0 200 ffffa0000461b520 usb0 usbevt
0 39 3 0 200 ffffa0000461b100 npfgc npfgccv
0 38 3 0 200 ffffa0000461c960 cryptoret crypto_w
0 37 3 0 200 ffffa0000461c120 unpgc unpgc
0 36 3 0 200 ffffa0000461d980 vmem_rehash vmem_rehash
0 35 3 0 200 ffffa0000461e9a0 xenbus rdst
0 34 3 0 200 ffffa0000461d140 xenwatch evtsq
0 33 3 0 200 ffffa0000461d560 mfi0 mfi0
0 24 3 0 200 ffffa00004611500 atabus1 atath
0 23 3 0 200 ffffa00004611920 atabus0 atath
0 22 3 0 200 ffffa000043cc0c0 scsibus0 sccomp
0 21 3 0 200 ffffa000043cc4e0 mfi0wq mfi0wq
0 20 3 0 200 ffffa000043cc900 usbtask-dr usbtsk
0 19 3 0 200 ffffa0000432d0a0 usbtask-hc usbtsk
0 17 3 0 200 ffffa0000432d8e0 ipmi ipmipoll
0 16 3 0 200 ffffa00003eb6080 sysmon smtaskq
0 15 3 0 200 ffffa00003eb64a0 pmfsuspend pmfsuspend
0 14 3 0 200 ffffa00003eb68c0 pmfevent pmfevent
0 13 3 0 200 ffffa00003a18060 sopendfree sopendfr
0 12 3 0 200 ffffa00003a18480 nfssilly nfssilly
0 11 3 0 200 ffffa00003a188a0 cachegc cachegc
0 10 3 0 200 ffffa00003a16040 vrele vrele
0 9 3 0 200 ffffa00003a16460 vdrain vdrain
0 8 3 0 200 ffffa00003a16880 modunload mod_unld
0 7 3 0 200 ffffa00003a0d020 xcall/0 xcall
0 6 1 0 200 ffffa00003a0d440 softser/0
0 5 1 0 200 ffffa00003a0d860 softclk/0
0 4 1 0 200 ffffa00003a0b000 softbio/0
0 3 1 0 200 ffffa00003a0b420 softnet/0
0 2 1 0 201 ffffa00003a0b840 idle/0
0 1 3 0 200 ffffffff80bcce80 swapper uvm
db>
>How-To-Repeat:
Use MS Windows 7 or Server 2008 R2 HVM guest on NetBSD-7/amd64 Dom0 + Xen4.5.
I use PV guests, NetBSD-5/i386 and OmniOS(OpenSolaris) at same time,
but they never trigger that panic. they also use sparse disk images.
>Fix:
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