Date: Wed, 22 Jan 2003 15:43:39 +0300 From: Gennady Proskurin <gpr@nvnpp.vrn.ru> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/47359: panic after kldunload snp Message-ID: <E18bKEF-0006JF-00@relay.nvnpp.vrn.ru>
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>Number: 47359
>Category: kern
>Synopsis: panic after kldunload snp
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jan 22 04:50:01 PST 2003
>Closed-Date:
>Last-Modified:
>Originator: Gennady Proskurin
>Release: FreeBSD 4.7-RELEASE-p3 i386
>Organization:
>Environment:
>Description:
When snp module unloaded after watch(8) connected and
disconnected from tty, doing lstat(2) on /dev/snp*
makes system panic.
>How-To-Repeat:
- Compile kernel without snp
- Watch some tty, then exit watch
- kldunload snp
- ls -l /dev/snp*
panic...
I kept core, so I can give some additional information from gdb.
IdlePTD at phsyical address 0x002fc000
initial pcb at physical address 0x00278960
panicstr: page fault
panic messages:
---
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xc18b8510
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc0196005
stack pointer = 0x10:0xccf2bdd0
frame pointer = 0x10:0xccf2bddc
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 = 11876 (ls)
interrupt mask = none
trap number = 12
panic: page fault
syncing disks... 13 1 1
done
Uptime: 12d6h2m26s
dumping to dev #da/0x20001, offset 8192
---
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
487 if (dumping++) {
(kgdb) bt
#0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
#1 0xc0166d9c in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:316
#2 0xc01671e9 in panic (fmt=0xc024e84c "%s")
at /usr/src/sys/kern/kern_shutdown.c:595
#3 0xc0216564 in trap_fatal (frame=0xccf2bd90, eva=3247146256)
at /usr/src/sys/i386/i386/trap.c:974
#4 0xc0216201 in trap_pfault (frame=0xccf2bd90, usermode=0, eva=3247146256)
at /usr/src/sys/i386/i386/trap.c:867
#5 0xc0215d73 in trap (frame={tf_fs = -856555504, tf_es = -867827696,
tf_ds = -861601776, tf_edi = -862491648, tf_esi = -862491648,
tf_ebp = -856506916, tf_isp = -856506948, tf_ebx = 0, tf_edx = 0,
tf_ecx = 7, tf_eax = -1047821088, tf_trapno = 12, tf_err = 0,
tf_eip = -1072078843, tf_cs = 8, tf_eflags = 66178,
tf_esp = -1055470080, tf_ss = -856506868})
at /usr/src/sys/i386/i386/trap.c:466
#6 0xc0196005 in vn_isdisk (vp=0xcc976c00, errp=0x0)
at /usr/src/sys/kern/vfs_subr.c:3072
#7 0xc019bcac in vn_stat (vp=0xcc976c00, sb=0xccf2bed4, p=0xccd71ba0)
at /usr/src/sys/kern/vfs_vnops.c:536
#8 0xc0198593 in lstat (p=0xccd71ba0, uap=0xccf2bf80)
at /usr/src/sys/kern/vfs_syscalls.c:1826
#9 0xc021679a in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = 134880256, tf_esi = 134897812, tf_ebp = -1077939084,
tf_isp = -856506412, tf_ebx = 134880328, tf_edx = 134881408, tf_ecx = 0,
tf_eax = 190, tf_trapno = 12, tf_err = 2, tf_eip = 134575376,
tf_cs = 31, tf_eflags = 659, tf_esp = -1077939224, tf_ss = 47})
at /usr/src/sys/i386/i386/trap.c:1175
#10 0xc0209625 in Xint0x80_syscall ()
#11 0x8056e45 in ?? ()
#12 0x8056a8c in ?? ()
#13 0x8048b91 in ?? ()
#14 0x8048a1c in ?? ()
#15 0x8048135 in ?? ()
(kgdb) l *0xc0196005
0xc0196005 is in vn_isdisk (/usr/src/sys/kern/vfs_subr.c:3072).
3067 if (!devsw(vp->v_rdev)) {
3068 if (errp != NULL)
3069 *errp = ENXIO;
3070 return (0);
3071 }
3072 if (!(devsw(vp->v_rdev)->d_flags & D_DISK)) {
3073 if (errp != NULL)
3074 *errp = ENOTBLK;
3075 return (0);
3076 }
(kgdb)
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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