Date: Tue, 18 Apr 2017 18:49:30 +0200 (CEST) From: Wojciech Puchar <wojtek@puchar.net> To: freebsd-hackers@freebsd.org Subject: lock order reversal dirhash/bufwait Message-ID: <alpine.BSF.2.20.1704181848070.10110@laptop.wojtek.intra>
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i'm getting this with latest 10-stable with witness etc. enabled. how to fix it? UFS options are options FFS # Berkeley Fast Filesystem options SOFTUPDATES # Enable FFS soft updates support options UFS_DIRHASH # Improve performance on big lock order reversal: 1st 0xfffffe0060aa58f8 bufwait (bufwait) @ kern/vfs_bio.c:3130 2nd 0xfffff800048db800 dirhash (dirhash) @ ufs/ufs/ufs_dirhash.c:280 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2e/frame 0xfffffe0072edcf90 kdb_backtrace() at kdb_backtrace+0x58/frame 0xfffffe0072edd040 _witness_debugger() at _witness_debugger+0x34/frame 0xfffffe0072edd060 witness_checkorder() at witness_checkorder+0xfda/frame 0xfffffe0072edd280 _sx_xlock() at _sx_xlock+0x12f/frame 0xfffffe0072edd2d0 ufsdirhash_acquire() at ufsdirhash_acquire+0x4a/frame 0xfffffe0072edd300 ufsdirhash_add() at ufsdirhash_add+0x1c/frame 0xfffffe0072edd340 ufs_direnter() at ufs_direnter+0xc4a/frame 0xfffffe0072edd490 ufs_makeinode() at ufs_makeinode+0x58d/frame 0xfffffe0072edd620 ufs_create() at ufs_create+0x51/frame 0xfffffe0072edd650 VOP_CREATE_APV() at VOP_CREATE_APV+0x1c4/frame 0xfffffe0072edd6a0 VOP_CREATE() at VOP_CREATE+0x51/frame 0xfffffe0072edd700 vn_open_cred() at vn_open_cred+0x2b4/frame 0xfffffe0072edd820 vn_open() at vn_open+0x47/frame 0xfffffe0072edd860 kern_openat() at kern_openat+0x1f5/frame 0xfffffe0072edda20 kern_open() at kern_open+0x37/frame 0xfffffe0072edda50 sys_open() at sys_open+0x31/frame 0xfffffe0072edda70 syscallenter() at syscallenter+0x456/frame 0xfffffe0072eddab0 amd64_syscall() at amd64_syscall+0x57/frame 0xfffffe0072eddbb0 Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0072eddbb0 --- syscall (5, FreeBSD ELF64, sys_open), rip = 0x800b71a3a, rsp = 0x7fffffffe578, rbp = 0x7fffffffe5a0 ---
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