Re: 2 new LORs using tonight's HEAD: UFS and DEVFS

* Doug Barton <dougb_at_FreeBSD.org> wrote:
> lock order reversal:
>  1st 0xc54d3e28 devfs (devfs) _at_ /usr/local/src/sys/kern/vfs_subr.c:2061
>  2nd 0xc5639454 devfsmount (devfsmount) _at_ /usr/local/src/sys/fs/devfs/devfs_vnops.c:201

> lock order reversal:
>  1st 0xc56ab168 ufs (ufs) _at_ /usr/local/src/sys/kern/vfs_subr.c:2061
>  2nd 0xc5693000 vfslock (vfslock) _at_ /usr/local/src/sys/kern/vfs_subr.c:364

> lock order reversal:
>  1st 0xc5312044 user map (user map) _at_ /usr/local/src/sys/vm/vm_map.c:3111
>  2nd 0xc54d4e28 ufs (ufs) _at_ /usr/local/src/sys/kern/vfs_subr.c:2061

I'm getting those three as well, including this one during shutdown:

| lock order reversal:
|  1st 0xc676a29c vfslock (vfslock) _at_ /store/home/ed/p4/mpsafetty/sys/kern/vfs_mount.c:1242
|  2nd 0xc67b4c08 syncer (syncer) _at_ /store/home/ed/p4/mpsafetty/sys/kern/vfs_subr.c:2156
| KDB: stack backtrace:
| db_trace_self_wrapper(c06f9676,e8e57ae8,c059ff2e,c06fba39,c67b4c08,...) at db_trace_self_wrapper+0x26
| kdb_backtrace(c06fba39,c67b4c08,c0702aac,c0702aac,c0702214,...) at kdb_backtrace+0x29
| witness_checkorder(c67b4c08,9,c0702214,86c,c076fc74,...) at witness_checkorder+0x6de
| _lockmgr(c67b4c08,2002,c67b4c38,c0702214,86c,...) at _lockmgr+0x43c
| vop_stdlock(e8e57b80,c0702214,c059f7f8,2002,c67b4bb0,...) at vop_stdlock+0x39
| VOP_LOCK1_APV(c073f100,e8e57b80,84f,e8e57ba0,c67b4c38,...) at VOP_LOCK1_APV+0xa5
| _vn_lock(c67b4bb0,2002,c0702214,86c,0,...) at _vn_lock+0xf2
| vrele(c67b4bb0,0,c0701b60,4f0,4da,...) at vrele+0x142
| dounmount(c676a29c,80000,c6b2eaa0,da544aec,0,...) at dounmount+0x372
| vfs_unmountall(c06f6810,0,c06f68c0,127,0,...) at vfs_unmountall+0x4e
| boot(c076b170,0,c06f68c0,ab,e8e57d2c,...) at boot+0x3cf
| reboot(c6b2eaa0,e8e57cfc,4,c06fcf5b,c0730028,...) at reboot+0x4b
| syscall(e8e57d38) at syscall+0x253
| Xint0x80_syscall() at Xint0x80_syscall+0x20
| --- syscall (55, FreeBSD ELF32, reboot), eip = 0x280b24fb, esp = 0xbfbfecac, ebp = 0xbfbfece8 ---

-- 
 Ed Schouten <ed_at_fxq.nl>
 WWW: http://g-rave.nl/