Date: Sun, 08 Dec 2002 15:39:21 +0100 From: Dag-Erling Smorgrav <des@ofug.org> To: current@freebsd.org Subject: panic in ithread_loop() Message-ID: <xzpsmx81so6.fsf@flood.ping.uio.no>
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This is 100% reproducible with a top-of-tree kernel, but didn't happen
with Wednesday's sources:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xc01e8d
fault code = supervisor write, page not present
instruction pointer = 0x8:0xc045dc80
stack pointer = 0x10:0xd536dce4
frame pointer = 0x10:0xd536dd00
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 12 (swi6: tty:sio clock)
kernel: type 12 trap, code=0
Stopped at 0xc045dc80: movb %al,0xc01e8d
db> trace
_end(0) at 0xc045dc80
ithread_loop(c152ab00,d536dd48,c1537b60,c01d3d80,0) at ithread_loop+0x11c
fork_exit(c01d3d80,c152ab00,d536dd48) at fork_exit+0x8f
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xd536dd7c, ebp = 0 ---
and according to gdb:
(gdb) list _end
No line number known for _end.
(gdb) list *0xc045dc80
No source file for address 0xc045dc80.
(gdb) l *(ithread_loop + 0x11c)
0xc01d3e9c is in ithread_loop (../../../kern/kern_intr.c:536).
531 goto restart;
532 }
533 if ((ih->ih_flags & IH_MPSAFE) == 0)
534 mtx_lock(&Giant);
535 ih->ih_handler(ih->ih_argument);
536 if ((ih->ih_flags & IH_MPSAFE) == 0)
537 mtx_unlock(&Giant);
538 }
539 }
540
(gdb) l *(fork_exit+0x8f)
0xc01d326f is in fork_exit (../../../kern/kern_fork.c:872).
867
868 /*
869 * Check if a kernel thread misbehaved and returned from its main
870 * function.
871 */
872 PROC_LOCK(p);
873 if (p->p_flag & P_KTHREAD) {
874 PROC_UNLOCK(p);
875 mtx_lock(&Giant);
876 printf("Kernel thread \"%s\" (pid %d) exited prematurely.\n",
(gdb) l *(fork_trampoline+0x1a)
0xc02db94e is at {standard input}:152.
147 {standard input}: No such file or directory.
in {standard input}
DES
--
Dag-Erling Smorgrav - des@ofug.org
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