[Bug 192923] Lock order reversal in vfs_bio.c bufwait

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192923

vidwer+fbsdbugs at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |vidwer+fbsdbugs at gmail.com

--- Comment #4 from vidwer+fbsdbugs at gmail.com ---
On 12.0-CURRENT r329060. booting from freebsd-ufs+GPT:

lock order reversal:
 1st 0xfffffe0001651cc0 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:3566
 2nd 0xfffff800b8b07400 dirhash (dirhash) @
/usr/src/sys/ufs/ufs/ufs_dirhash.c:289
stack backtrace:
#0 0xffffffff80b2dbf3 at witness_debugger+0x73
#1 0xffffffff80b2da74 at witness_checkorder+0xe34
#2 0xffffffff80ad1ac8 at _sx_xlock+0x68
#3 0xffffffff80dca40d at ufsdirhash_add+0x3d
#4 0xffffffff80dcd2df at ufs_direnter+0x49f
#5 0xffffffff80dd4a4e at ufs_rename+0x111e
#6 0xffffffff810fcf41 at VOP_RENAME_APV+0xe1
#7 0xffffffff80ba5f8a at kern_renameat+0x3ca
#8 0xffffffff822215d9 at filemon_wrapper_rename+0x19
#9 0xffffffff80f7ec2b at amd64_syscall+0x79b
#10 0xffffffff80f59ffd at fast_syscall_common+0x101

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