Date: Sun, 8 Nov 2015 23:51:23 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org> Subject: LOR on umount Message-ID: <563F7D8B.6020902@grosbein.net>
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Hi! While trying to reproduce kernel panic using debugging kernel I've got lock order reversal trying to umount UFS1 /dev/ufs/extflash (/dev/da0s1d) mounted using USB pen as "async,noatime" (no soft-updates): # lock order reversal: 1st 0x81a6ab74 ufs (ufs) @ /home/src/sys/kern/vfs_mount.c:1224 2nd 0x8276a4b4 devfs (devfs) @ /home/src/sys/ufs/ffs/ffs_vfsops.c:1375 KDB: stack backtrace: db_trace_thread+30 (?,?,?,?) ra c3b4789000000018 sp 0 sz 0 db_trace_self+1c (?,?,?,?) ra c3b478a800000018 sp 0 sz 0 8008e500+34 (?,?,?,?) ra c3b478c0000001a0 sp 0 sz 0 kdb_backtrace+44 (?,?,?,?) ra c3b47a6000000018 sp 0 sz 0 801ccfd8+34 (?,?,?,?) ra c3b47a7800000020 sp 0 sz 0 witness_checkorder+b24 (?,?,?,55f) ra c3b47a9800000058 sp 0 sz 0 __lockmgr_args+9a8 (?,?,8276a4d4,?) ra c3b47af000000080 sp 0 sz 1 vop_stdlock+4c (?,?,?,?) ra c3b47b7000000028 sp 0 sz 0 VOP_LOCK1_APV+f4 (?,?,?,?) ra c3b47b9800000020 sp 0 sz 0 _vn_lock+8c (?,?,?,?) ra c3b47bb800000050 sp 0 sz 0 ffs_flushfiles+98 (?,?,?,?) ra c3b47c0800000038 sp 0 sz 0 802b4ea8+bc (?,?,?,?) ra c3b47c4000000040 sp 0 sz 0 dounmount+9f0 (80e74560,?,?,?) ra c3b47c8000000060 sp 100000000 sz 0 sys_unmount+2f8 (?,?,?,?) ra c3b47ce0000000e0 sp 0 sz 0 trap+7f0 (?,?,?,?) ra c3b47dc0000000c0 sp 0 sz 0 MipsUserGenException+e8 (?,?,?,4046f520) ra c3b47e8000000000 sp 0 sz 0 pid 694 That's head at r290541. It was unmounted, though. Seems to be harmless, but who knows...
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