Bug 210906 - [lor] lock order reversal in vfs_mount/vfs_subr under ZFS
Summary: [lor] lock order reversal in vfs_mount/vfs_subr under ZFS
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: CURRENT
Hardware: amd64 Any
: --- Affects Only Me
Assignee: freebsd-bugs (Nobody)
Depends on:
Reported: 2016-07-08 04:50 UTC by Paul Armstrong
Modified: 2016-07-08 04:51 UTC (History)
1 user (show)

See Also:


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Description Paul Armstrong 2016-07-08 04:50:04 UTC
lock order reversal:
 1st 0xfffff80004da07c8 zfs (zfs) @ /usr/src/sys/kern/vfs_mount.c:848
 2nd 0xfffff8000f8535f0 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2523
stack backtrace:
#0 0xffffffff80aae180 at witness_debugger+0x70
#1 0xffffffff80aae074 at witness_checkorder+0xe54
#2 0xffffffff80a26dc2 at __lockmgr_args+0x4c2
#3 0xffffffff80afeebc at vop_stdlock+0x3c
#4 0xffffffff810738ea at VOP_LOCK1_APV+0xda
#5 0xffffffff80b1fc2a at _vn_lock+0x9a
#6 0xffffffff80b10123 at vget+0x63
#7 0xffffffff8092122d at devfs_allocv+0xcd
#8 0xffffffff80920d33 at devfs_root+0x43
#9 0xffffffff80b0746e at vfs_donmount+0x144e
#10 0xffffffff80b05ff2 at sys_nmount+0x72
#11 0xffffffff80f16b2b at amd64_syscall+0x2db
#12 0xffffffff80ef68cb at Xfast_syscall+0xfb

Noticed when stopping a ZFS mounted jail.
11.0 Alpha 6
Comment 1 Paul Armstrong 2016-07-08 04:51:55 UTC
That should say "noticed when _starting_ a ZFS based jail"