Date: Fri, 27 Jul 2001 09:31:49 +0930 (CST) From: Benjamin Close <cisbjc@cs.unisa.edu.au> To: freebsd-current@freebsd.org Subject: Recursing on a non-recursive lock Message-ID: <Pine.OSF.4.21.0107270856030.24942-200000@reason.levels.unisa.edu.au>
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--0-981467433-996192039=:24942
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Content-ID: <Pine.OSF.4.21.0107270930431.24942@reason.levels.unisa.edu.au>
Hi All,
For a while now (July 12 first noticed) I've been experiencing a
intermittent panic on a non-recursive lock. Whilst I can grab the panic,
savecore panics again writing it. It seems to occur only under heavy disk
io and hence a make install of XFree86 causes the condition (not always at
the same place). Details below:
This always occurs sometime before the panic:
lock order reversal
1st 0xc907c1fc process lock @ ../../../vm/vm_glue.c:469
2nd 0xc0b4cfb0 lockmgr interlock @ ../../../kern/kern_lock.c:239
Then sometime later (beware, hand transcribed)...
recursed on non-recursive lock (sleep mutex) process lock @
../../../kern_lock:262
first acquired @ ../../../kern/kern_exit.c:327
panic: recurse
Debugger("panic")
Stopped at Debugger+0x45: pushl %ebx
db>trace
Debugger(c040a27b) at Debugger+0x45
panic(c040cf28,0,c04ad7fc,c907bca0,0) at panic 0x70
witness_lock(c907bdbc,8,c04087b4,106) at witness_lock+0x356
lockmgr(c04ad7fc,1,0,c907bca0,c90ced88) at lockmgr+0x200
vm_map_lock_read(c04ad7cc,1,c907bca0,c04ad7cc,c027f001) at
vm_map_lock_read+01a
vm_map_lookup(c90cee04,c9122000,1,c90cee08,c90cedfc) at vm_map_lookup+0x5f
vm_fault1(c04ad7cc,c9122000,1,0,0) at vm_fault1+0x90
vm_fault(c04ad7cc,c9122000,1,0,0) at vm_fault+0x96
trap_pfault(c90ceee0,0,c91222ac) at trap_pfault+0x2d1
trap(c0400018,10,c9070010,c907bca0,c90cdd18) at trap+0x774
calltrap() at tcalltrap+0x5
--- trap 0xc, eip = 0xc024aac2, esp = 0xc90cef20, ebp=0xc90cef40
exit1(c907bca0,0,c90cefa0,c03b35a9,c907bca0) at exit1+0x1006
sys_exit(c907bca0,c90cef80,ffffffff,0,80bc608) at sys_exit+0x15
syscall(80b002f,812002f,bfbf002f,80bc608,0) at syscall+0x695
syscall_with_err_pushed() at syscall_with_err_pushed+01b
--- syscall ( 1, FreeBSD Elf, sys_exit), eip=0x8093f54, esp=0xbfbfd0e0,
ebp=0xbfbfd10c
db>show locks
exclusive( sleep mutex ) lockmgr ( 0xc0480700 ) locked @
../../../kern/kern_lock.c:239
exclusive( sleep mutex ) process lock ( 0xc907bdbc ) locked @
../../../kern/kern_exit.c:327
exclusive ( sx ) proctree (0xc04be5e0) locked @
../../../kernl/kern_exit.c:282
exclusive (sleep mutex) Giant ( 0xc04c4400) locked @
../../../vm/vm_fault.c:195
Other useful stuff (tired of transcribing):
Fatal trap 12: page fault while in kernel mode
fault code = supervisor read, page not present
current process = 5756 (ld)
If this is not enough to help diagnose the problem, what else can I
provide (sadly I can't give symbols as this fault occured compiling the
kernel :(
The machine is a Dell Inspiron 8000 laptop (dmesg attached)
and the problem is getting more frequent with newer kernels.
Cheers,
Benjamin
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