Date: Wed, 24 Aug 2011 14:50:13 GMT From: Martin Simmons <martin@lispworks.com> To: freebsd-fs@FreeBSD.org Subject: Re: kern/153847: [nfs] [panic] Kernel panic from incorrect m_free in nfs_getattr Message-ID: <201108241450.p7OEoDSI090781@freefall.freebsd.org>
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The following reply was made to PR kern/153847; it has been noted by GNATS.
From: Martin Simmons <martin@lispworks.com>
To: bug-followup@FreeBSD.org
Cc:
Subject: Re: kern/153847: [nfs] [panic] Kernel panic from incorrect m_free in nfs_getattr
Date: Wed, 24 Aug 2011 15:37:31 +0100
FTR, I just got this again with the latest 7.4 kernel:
FreeBSD 7.4-RELEASE #0: Thu Feb 17 03:51:56 UTC 2011
Unread portion of the kernel message buffer:
<6>nfs server pid947@greig:/sp: is alive again
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0x819
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc086fea0
stack pointer = 0x28:0xc53c9824
frame pointer = 0x28:0xc53c9834
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 = 19529 (ls)
trap number = 12
panic: page fault
cpuid = 1
Uptime: 6d22h30m27s
Physical memory: 2035 MB
Dumping 257 MB: 242 226 210 194 178 162 146 130 114 98 82 66 50 34 18 2
Reading symbols from /boot/kernel/acpi.ko...Reading symbols from /boot/kernel/acpi.ko.symbols...done.
done.
Loaded symbols for /boot/kernel/acpi.ko
#0 doadump () at pcpu.h:197
197 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) where
#0 doadump () at pcpu.h:197
#1 0xc081c693 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:421
#2 0xc081c967 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:576
#3 0xc0b29a0c in trap_fatal (frame=0xc53c97e4, eva=2073)
at /usr/src/sys/i386/i386/trap.c:950
#4 0xc0b29c90 in trap_pfault (frame=0xc53c97e4, usermode=0, eva=2073)
at /usr/src/sys/i386/i386/trap.c:863
#5 0xc0b2a66c in trap (frame=0xc53c97e4) at /usr/src/sys/i386/i386/trap.c:541
#6 0xc0b0cf8b in calltrap () at /usr/src/sys/i386/i386/exception.s:166
#7 0xc086fea0 in m_freem (mb=0x819) at /usr/src/sys/kern/uipc_mbuf.c:162
#8 0xc09c8c95 in nfs_getattr (ap=0xc53c9968)
at /usr/src/sys/nfsclient/nfs_vnops.c:664
#9 0xc0b3f102 in VOP_GETATTR_APV (vop=0xc0cb6f80, a=0xc53c9968)
at vnode_if.c:530
#10 0xc09cb445 in nfs_lookup (ap=0xc53c9a90) at vnode_if.h:286
#11 0xc0b40b06 in VOP_LOOKUP_APV (vop=0xc0cb6f80, a=0xc53c9a90)
at vnode_if.c:99
#12 0xc089685b in lookup (ndp=0xc53c9ba8) at vnode_if.h:57
#13 0xc08976de in namei (ndp=0xc53c9ba8) at /usr/src/sys/kern/vfs_lookup.c:234
#14 0xc08a58e4 in kern_stat (td=0xc5c396c0,
path=0x28212088 <Address 0x28212088 out of bounds>,
pathseg=UIO_USERSPACE, sbp=0xc53c9c18)
at /usr/src/sys/kern/vfs_syscalls.c:2141
#15 0xc08a5acf in stat (td=0xc5c396c0, uap=0xc53c9cfc)
at /usr/src/sys/kern/vfs_syscalls.c:2125
#16 0xc0b29fe5 in syscall (frame=0xc53c9d38)
at /usr/src/sys/i386/i386/trap.c:1101
#17 0xc0b0cff0 in Xint0x80_syscall ()
at /usr/src/sys/i386/i386/exception.s:262
#18 0x00000033 in ?? ()
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