Date: Fri, 09 Feb 2018 21:01:59 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 225795] panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel Message-ID: <bug-225795-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D225795 Bug ID: 225795 Summary: panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: asomers@FreeBSD.org Found by snapshot_019_pos from the ZFS test suite: panic: found unreferenced mountpoint cpuid =3D 8 time =3D 1518201424 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00cef3f= 320 vpanic() at vpanic+0x18d/frame 0xfffffe00cef3f380 vpanic() at vpanic/frame 0xfffffe00cef3f400 zfsctl_snapdir_lookup() at zfsctl_snapdir_lookup+0x461/frame 0xfffffe00cef3= f680 VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xd3/frame 0xfffffe00cef3f6b0 lookup() at lookup+0x682/frame 0xfffffe00cef3f750 namei() at namei+0x52b/frame 0xfffffe00cef3f810 vn_open_cred() at vn_open_cred+0x213/frame 0xfffffe00cef3f950 kern_openat() at kern_openat+0x20c/frame 0xfffffe00cef3fac0 amd64_syscall() at amd64_syscall+0x79b/frame 0xfffffe00cef3fbf0 fast_syscall_common() at fast_syscall_common+0xfc/frame 0x7fffffffb240 Uptime: 11h59m40s Dumping 5340 out of 49055 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..= 91% __curthread () at ./machine/pcpu.h:229 229 __asm("movq %%gs:%1,%0" : "=3Dr" (td) (kgdb) #0 __curthread () at ./machine/pcpu.h:229 #1 doadump (textdump=3D1) at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:346 #2 0xffffffff80ac7042 in kern_reboot (howto=3D260) at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:415 #3 0xffffffff80ac760d in vpanic (fmt=3D<optimized out>, ap=3D0xfffffe00cef= 3f3c0) at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:811 #4 0xffffffff80ac7420 in kassert_panic ( fmt=3D0xffffffff8224ea68 "found unreferenced mountpoint") at /usr/home/alans/freebsd/head/sys/kern/kern_shutdown.c:697 #5 0xffffffff821eae71 in zfsctl_snapdir_lookup (ap=3D0xfffffe00cef3f6f0) at /usr/home/alans/freebsd/head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs= /zfs_ctldir.c:893 #6 0xffffffff810f50a3 in VOP_LOOKUP_APV (vop=3D<optimized out>, a=3D0xfffffe00cef3f6f0) at vnode_if.c:127 #7 0xffffffff80b89c92 in VOP_LOOKUP (vpp=3D0xfffffe00cef3f9c8, cnp=3D0xfffffe00cef3f9f0, dvp=3D<optimized out>) at ./vnode_if.h:54 #8 lookup (ndp=3D0xfffffe00cef3f968) at /usr/home/alans/freebsd/head/sys/kern/vfs_lookup.c:888 #9 0xffffffff80b8921b in namei (ndp=3D0xfffffe00cef3f968) at /usr/home/alans/freebsd/head/sys/kern/vfs_lookup.c:450 #10 0xffffffff80ba6d13 in vn_open_cred (ndp=3D0xfffffe00cef3f968, flagp=3D0xfffffe00cef3fa94, cmode=3D1, vn_open_flags=3D0, cred=3D0xfffff80133087c00, fp=3D0xfffff807b332e9b0) at /usr/home/alans/freebsd/head/sys/kern/vfs_vnops.c:279 #11 0xffffffff80b9f5ec in kern_openat (td=3D0xfffff804ca09d000, fd=3D-100, path=3D0x800cde000 <error: Cannot access memory at address 0x800cde000>, pathseg=3DUIO_USERSPACE, flags=3D1179653, mode=3D<optimized out>) at /usr/home/alans/freebsd/head/sys/kern/vfs_syscalls.c:1084 #12 0xffffffff80f7937b in syscallenter (td=3D0xfffff804ca09d000) at /usr/home/alans/freebsd/head/sys/amd64/amd64/../../kern/subr_syscall.c:134 #13 amd64_syscall (td=3D0xfffff804ca09d000, traced=3D0) at /usr/home/alans/freebsd/head/sys/amd64/amd64/trap.c:935 #14 0xffffffff80f55e38 in fast_syscall_common () at /usr/home/alans/freebsd/head/sys/amd64/amd64/exception.S:468 --=20 You are receiving this mail because: You are the assignee for the bug.=
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