System panic under load (additional information)
Micah
micahjon at ywave.com
Wed Oct 25 17:03:04 UTC 2006
Okay, I was reading the developer's handbook and trying stuff. The
following may be helpful:
(kgdb) up 7
#7 0xc0593d34 in vfs_hash_get (mp=0xc5a53000, hash=5347783, flags=2,
td=0xc5ef9d80, vpp=0xf02ca99c, fn=0, arg=0x0)
at /usr/src/sys/kern/vfs_hash.c:73
73 if (vp->v_hash != hash)
(kgdb) list *0xc0593d34
0xc0593d34 is in vfs_hash_get (/usr/src/sys/kern/vfs_hash.c:73).
64 int
65 vfs_hash_get(struct mount *mp, u_int hash, int flags, struct
thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg)
66 {
67 struct vnode *vp;
68 int error;
69
70 while (1) {
71 mtx_lock(&vfs_hash_mtx);
72 LIST_FOREACH(vp, vfs_hash_index(mp, hash),
v_hashlist) {
73 if (vp->v_hash != hash)
74 continue;
75 if (vp->v_mount != mp)
76 continue;
77 if (fn != NULL && fn(vp, arg))
(kgdb) print vp
$1 = (struct vnode *) 0xffffffff
I'm no expert but that doesn't look like a valid address.... I was able
to get another crashdump, but kgdb locked up while trying to read it.
Thanks,
Micah
Micah wrote:
> Can anyone help me in deciphering what this crashdump is telling me? My
> i386 6.1p3 system is panicking under heavy IO load and I'm trying to
> isolate the cause. I've never debugged a crashdump before, so if there's
> more information I can milk from the core file, let me know.
>
> Thanks,
> Micah
>
> trisha# kgdb kernel.debug /home/crash/vmcore.0
> [GDB will not be able to debug user-mode threads:
> /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. Type "show warranty" for details.
> This GDB was configured as "i386-marcel-freebsd".
>
> Unread portion of the kernel message buffer:
>
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x27
> fault code = supervisor read, page not present
> instruction pointer = 0x20:0xc0593d34
> stack pointer = 0x28:0xf02ca89c
> frame pointer = 0x28:0xf02ca8bc
> 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 = 24805 (perl5.8.8)
> trap number = 12
> panic: page fault
> Uptime: 13h16m1s
> Dumping 1534 MB (2 chunks)
> chunk 0: 1MB (159 pages) ... ok
> chunk 1: 1534MB (392672 pages) 1518 1502 1486 1470 1454 1438 1422 1406
> 1390 1374 1358 1342 1326 1310 1294 1278 1262 1246 1230 1214 1198 1182
> 1166 1150 1134 1118 1102 1086 1070 1054 1038 1022 1006 990 974 958 942
> 926 910 894 878 862 846 830 814 798 782 766 750 734 718 702 686 670 654
> 638 622 606 590 574 558 542 526 510 494 478 462 446 430 414 398 382 366
> 350 334 318 302 286 270 254 238 222 206 190 174 158 142 126 110 94 78 62
> 46 30 14
>
> #0 doadump () at pcpu.h:165
> 165 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
> (kgdb) bt
> #0 doadump () at pcpu.h:165
> #1 0xc0535a3f in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:402
> #2 0xc0535d66 in panic (fmt=0xc0711e06 "%s")
> at /usr/src/sys/kern/kern_shutdown.c:558
> #3 0xc06ecf2c in trap_fatal (frame=0xf02ca85c, eva=0)
> at /usr/src/sys/i386/i386/trap.c:836
> #4 0xc06ecc32 in trap_pfault (frame=0xf02ca85c, usermode=0, eva=39)
> at /usr/src/sys/i386/i386/trap.c:744
> #5 0xc06ec7fd in trap (frame=
> {tf_fs = 8, tf_es = 40, tf_ds = 40, tf_edi = 4, tf_esi = 4, tf_ebp
> = -265508676, tf_isp = -265508728, tf_ebx = -1, tf_edx = -980369408,
> tf_ecx = -979030016, tf_eax = 5347783, tf_trapno = 12, tf_err = 0,
> tf_eip = -1067893452, tf_cs = 32, tf_eflags = 66182, tf_esp =
> -979030016, tf_ss = 5347783})
> at /usr/src/sys/i386/i386/trap.c:434
> #6 0xc06d9e2a in calltrap () at /usr/src/sys/i386/i386/exception.s:139
> #7 0xc0593d34 in vfs_hash_get (mp=0xc5a53000, hash=5347783, flags=2,
> td=0xc5ef9d80, vpp=0xf02ca99c, fn=0, arg=0x0)
> at /usr/src/sys/kern/vfs_hash.c:73
> #8 0xc067af59 in ffs_vget (mp=0xc5a53000, ino=5347783, flags=2,
> vpp=0xf02ca99c) at pcpu.h:162
> #9 0xc0683353 in ufs_lookup (ap=0xf02caa40)
> at /usr/src/sys/ufs/ufs/ufs_lookup.c:572
> #10 0xc0700f03 in VOP_CACHEDLOOKUP_APV (vop=0x5199c7, a=0xc590c000)
> at vnode_if.c:150
> #11 0xc059006a in vfs_cache_lookup (ap=0x5199c7) at vnode_if.h:82
> #12 0xc0700e78 in VOP_LOOKUP_APV (vop=0xc0764f20, a=0xf02caaec)
> at vnode_if.c:99
> #13 0xc059547b in lookup (ndp=0xf02cabf4) at vnode_if.h:56
> #14 0xc0594c08 in namei (ndp=0xf02cabf4) at
> /usr/src/sys/kern/vfs_lookup.c:203
> #15 0xc05a672d in kern_stat (td=0xc5ef9d80,
> path=0xc590c000 "°\033\210Ê B\215É0£ÓÊ\020±ZÉ\020ñ\211Æ0\003\237ÊPU0Ê",
> pathseg=3314597888, sbp=0x5199c7) at
> /usr/src/sys/kern/vfs_syscalls.c:2076
> #16 0xc05a66bf in stat (td=0x5199c7, uap=0xf02cad04)
> at /usr/src/sys/kern/vfs_syscalls.c:2061
> #17 0xc06ed302 in syscall (frame=
> {tf_fs = 59, tf_es = 59, tf_ds = 59, tf_edi = 1209537912, tf_esi =
> 140130588, tf_ebp = -1077941096, tf_isp = -265507484, tf_ebx =
> 1209530852, tf_edx = 68, tf_ecx = 0, tf_eax = 188, tf_trapno = 12,
> tf_err = 2, tf_eip = 1210540343, tf_cs = 51, tf_eflags = 582, tf_esp =
> -1077941140, tf_ss = 59})
> at /usr/src/sys/i386/i386/trap.c:981
> #18 0xc06d9e7f in Xint0x80_syscall () at
> /usr/src/sys/i386/i386/exception.s:200
> ---Type <return> to continue, or q <return> to quit---
> #19 0x00000033 in ?? ()
> Previous frame inner to this frame (corrupt stack?)
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