Re: lock order reversal

Duane Whitty wrote:
Submitter-Id: current-users
Originator: Duane Whitty
Organization:
Confidential: no Synopsis: lock order reversal
Severity: serious
Priority: medium
Category: kern
Class: sw-bug
Release: FreeBSD 6.2-PRERELEASE i386
Environment:
System: FreeBSD dwpc.dwlabs.ca 6.2-PRERELEASE FreeBSD 6.2-PRERELEASE #1: Tue Sep 12 00:24:56 ADT 2006 duane@xxxxxxxxxxxxxx:/usr/obj/usr/src/sys/DWPC-KERNEL i386

Kernel configration

[snip]


Description:

lock order reversal:
1st 0xc06c6a40 cdev (cdev) @ /usr/src/sys/kern/kern_conf.c:61
2nd 0xc3281718 sleep mtxpool (sleep mtxpool) @ /usr/src/sys/kern/kern_prot.c:1877
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c06d77c8,c06d6f58,c06a1b04,...) at kdb_backtrace+0x29
witness_checkorder(c3281718,9,c0668211,755) at witness_checkorder+0x578
_mtx_lock_flags(c3281718,0,c0668211,755,c4c32700,...) at _mtx_lock_flags+0x78
crhold(c4a4ca00,deaf593e,deaf58b0,deaf5bf4,deaf5828,...) at crhold+0x1b
make_dev_credv(c06a79c0,0,c4a4ca00,0,0,...) at make_dev_credv+0xc6
make_dev_cred(c06a79c0,0,c4a4ca00,0,0,...) at make_dev_cred+0x21
pty_clone(0,c4a4ca00,deaf593e,5,deaf58b0,c329638c,0,c0660f31,212) at pty_clone+0xee
devfs_lookupx(deaf59d0,c349ce10,c0660f31,23f,c069a300,...) at devfs_lookupx+0x2bc
devfs_lookup(deaf59d0) at devfs_lookup+0x2d
VOP_LOOKUP_APV(c069a300,deaf59d0) at VOP_LOOKUP_APV+0x87
lookup(deaf5bcc) at lookup+0x47a
namei(deaf5bcc) at namei+0x376
vn_open_cred(deaf5bcc,deaf5ccc,0,c4a4ca00,c,...) at vn_open_cred+0x2a0
vn_open(deaf5bcc,deaf5ccc,0,c) at vn_open+0x1e
kern_open(c55b1190,8197850,0,3,0,...) at kern_open+0xb6
open(c55b1190,deaf5d04) at open+0x1a
syscall(805003b,810003b,bfbf003b,805c000,0,...) at syscall+0x22f
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (5, FreeBSD ELF32, open), eip = 0x2940c4f3, esp = 0xbfbfd3cc, ebp = 0xbfbfd3f8 ---

How-To-Repeat: Unknown
Fix:

This seems to only happen after I start X11

Best Regards,

Duane Whitty
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