Date: Sun, 18 Sep 2005 12:26:42 -0700 (PDT) From: Mark Diekhans <markd@kermodei.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/86307: lock order reversal in if_iwi driver Message-ID: <20050918192642.8B1E95C71@kermodei.com> Resent-Message-ID: <200509181930.j8IJU5Aj098671@freefall.freebsd.org>
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>Number: 86307
>Category: kern
>Synopsis: lock order reversal in if_iwi driver
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Sep 18 19:30:04 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Mark Diekhans
>Release: FreeBSD 6.0-BETA4 i386
>Organization:
>Environment:
System: FreeBSD kestrel.kermodei.com 6.0-BETA4 FreeBSD 6.0-BETA4 #6: Wed Sep 14 19:35:49 PDT 2005 root@kestrel.kermodei.com:/usr/src/sys/i386/compile/X1 i386
>Description:
lock order reversal in iwi driver occurs frequenly while using
kldload-ed if_iwi driver. Sometimes performance will degrade
or driver will become non-function; although it's not clear if
this is related.
initialization message:
iwi0: <Intel(R) PRO/Wireless 2200BG> mem 0xdfcff000-0xdfcfffff irq 9 at device 3.0 on pci2
iwi0: Ethernet address: 00:12:f0:62:ea:ab
iwi0: link state changed to UP
error:
lock order reversal
1st 0xc062ec60 ifnet (ifnet) @ net/if.c:1159
2nd 0xc25d1b68 iwi0 (network driver) @ /usr/src/sys/modules/iwi/../../dev/iwi/if_iwi.c:1503
KDB: stack backtrace:
witness_checkorder(c25d1b68,9,c2643e1f,5df) at witness_checkorder+0x350
_mtx_lock_flags(c25d1b68,0,c2643e1f,5df,c25d1004) at _mtx_lock_flags+0x40
iwi_watchdog(c2564400) at iwi_watchdog+0x2a
if_slowtimo(0,c04eeb04,1b5b,1,0) at if_slowtimo+0x7f
softclock(0,0,c2339624,0,c047bcec) at softclock+0x15a
ithread_loop(c22e2400,e5353d38,c22e2400,c047bcec,0) at ithread_loop+0x194
fork_exit(c047bcec,c22e2400,e5353d38) at fork_exit+0x7d
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xe5353d6c, ebp = 0 ---
>How-To-Repeat:
happens frequently, but exact sequence to reproduce is unclear.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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