On Wed, 31 Jul 2002, Huang wen hui wrote:
I got a problem with jdk-p7+XIM input server. I try to use gdb to find out.
But if I run gdb on X11, -CURRENT(07/29) box will crash immediately:
gdb file /usr/local/jdk1.3.1/bin/i386/green_threads/java_g
gdb run -version
panic: blockable sleep lock (sleep mutex) sellck @
../../../kern/sys_generic.c:1178
Debugger(panic)
Stopped at Debugger+0x45: xchgl %ebx, in_Debugger.0
dbtr
Debugger(c043bffc) at Debugger+0x45
Panic(.) at panic+0x7c
witness_lock(...) at witness_lock+0x7f
_mtx_lock_flags(...) at _mxt_lock_flags+0x6b
selwakeup(...) at selwakeup+0x1e
ptcwakeup(...) at ptcwakeup+0x23
ptsstart(...) at ptsstart+0x2c
ttstart(...) at ttstart+0x16
tputchar(...) at tputchar+0x35
putchar(...) at putchar+0x55
kvprintf(...) at kvprintf+0x77
printf(...) at printf+0x43
userret(...) at userret+0xd9
ast(...) at ast+02b5
doreti_ast() at doreti_ast+0x1a
On text console, -CURRENT box will not crash. and I got msg:
gdb file /usr/local/jdk1.3.1/bin/i386/green_threads/java_g
gdb run -version
lock order reversal
1st 0xc44e0180 pipe mutex (pipe mutex) @ ../../../kern/sys_pipe.c:451
2nd 0xc04af6c0 sigio lock (sigio lock) @ ../../../kern/kern_sig.c:2014
failed to set signal flags properlyt for ast()
failed to set signal flags properlyt for ast()
failed to set signal flags properlyt for ast()
failed to set signal flags properlyt for ast()
failed to set signal flags properlyt for ast()
failed to set signal flags properlyt for ast()
failed to set signal flags properlyt for ast()
I comment printf in function userret in file
/usr/src/sys/kern/subr_trap.c
the box does not crash now. so It is not safe for using printf in
/usr/src/sys/kern/subr_trap.c ?
No, since printf itself is broken. The TIOCCONS ioctl is broken in
all cases and the syscons console driver is broken in some cases.
Don't use xconsole or anything else that uses the TIOCCONS ioctl.
Commenting out the printf is as good a workaround as any. Some
printfs in mi_switch() are still commented out because of this bug.
Try the following patch for fixing the problem reported by the printf.
%%%
Index: kern_sig.c
===
RCS file: /home/ncvs/src/sys/kern/kern_sig.c,v
retrieving revision 1.175
diff -u -2 -r1.175 kern_sig.c
--- kern_sig.c 10 Jul 2002 06:31:35 - 1.175
+++ kern_sig.c 21 Jul 2002 01:25:04 -
@@ -1634,4 +1609,5 @@
if (SIGISMEMBER(p-p_sigmask, sig))
continue;
+ signotify(p);
}
%%%
Bruce
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