Hello.
Yesterday a 6.2/amd64 SMP server of mine entered DDB after a problem
with locks. Since I was not there, I instructed one user to type "panic"
and I got a dump.
Here's what I get:
xxxxx# kgdb kernel.debug /var/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 "amd64-marcel-freebsd".
Unread portion of the kernel message buffer:
KDB: stack backtrace:
vfs_badlock() at vfs_badlock+0x95
assert_vop_elocked() at assert_vop_elocked+0x7d
VOP_WRITE_APV() at VOP_WRITE_APV+0xee
vn_write() at vn_write+0x1ec
dofilewrite() at dofilewrite+0x87
kern_writev() at kern_writev+0x51
write() at write+0x4a
syscall() at syscall+0x4d1
Xfast_syscall() at Xfast_syscall+0xa8
--- syscall (4, FreeBSD ELF64, write), rip = 0x8017ecbac, rsp = 0x7fffffffb568,
rbp = 0x8054079c0 ---
VOP_WRITE: 0xffffff00097f1ca8 is not exclusive locked but should be
KDB: enter: lock violation
Locked vnodes
0xffffff00097f1ca8: tag ufs, type VREG
usecount 5, writecount 2, refcount 560 mountedhere 0
flags ()
v_object 0xffffff0002f65000 ref 3 pages 2216
lock type ufs: SHARED (count 1)#0 0xffffffff80238786 at lockmgr+0x5f6
#1 0xffffffff8033d558 at ffs_lock+0x58
#2 0xffffffff803b4df1 at VOP_LOCK_APV+0x81
#3 0xffffffff802b80cb at vn_lock+0x6b
#4 0xffffffff802b92c6 at vn_write+0x156
#5 0xffffffff80271b37 at dofilewrite+0x87
#6 0xffffffff80271e01 at kern_writev+0x51
#7 0xffffffff80271efa at write+0x4a
#8 0xffffffff803854a1 at syscall+0x4d1
#9 0xffffffff80370b78 at Xfast_syscall+0xa8
ino 1078094, on dev mirror/gm0s1e
panic: from debugger
cpuid = 0
Uptime: 13d23h8m15s
Dumping 1023 MB (2 chunks)
chunk 0: 1MB (151 pages) ... ok
chunk 1: 1023MB (261744 pages) 1007 991 975 959 943 927 911 895 879 863 847
831 815 799 783 767 751 735 719 703 687 671 655 639 623 607 591 575 559 543 527
511 495 479 463 447 431 415 399 383 367 351 335 319 303 287 271 255 239 223 207
191 175 159 143 127 111 95 79 63 47 31 15
#0 doadump () at pcpu.h:172
172 __asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb)
Any hint?
Is there a way I can get these dumps automatically, without entering
DDB, since this is an unattended server?
I have this options in my kernel configuration:
options KDB
options DDB
options KDB_UNATTENDED
options INVARIANTS
options INVARIANT_SUPPORT
options WITNESS
options DEBUG_LOCKS
options DEBUG_VFS_LOCKS
options DIAGNOSTIC
bye & Thanks
av.
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