Date: Tue, 1 Dec 1998 14:07:13 -0800 (PST) From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: freebsd-current@FreeBSD.ORG Subject: Crash dump howto? Message-ID: <199812012207.OAA00603@troutmask.apl.washington.edu>
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Anyone care to share their method on getting a kernel crash dump
on a very recent -current tree?
Hardware:
Micron Millenia Pro2+ (dual 200 MHz Pentium Pro), 256 MB memory
Adaptec 2940 Ultra SCSI controller, Seagate ST34371N 4.1MB SCSI2 drive,
Quantum Lightning 730S 700MB SCSI2 drive, Plextor CD-ROM PX-12CS
I'm running an ELF SMP kernel, and I have "options DDB" and
"options AHC_ALLOW_MEMIO". Kernels have been configured with the
-g to config(8). [This reminds me, how does one strip an ELF
kernel?]
da0 is the Seagate drive, and da1 is the Quantum drive.
Under heavy load:
dev=0x20405, bno = 13, bsize = 8192, size = 8192, fs = /usr
panic: ffs_blkfree: bad size
mp_lock = 00000001; cpuid = 0; lapic.id = 01000000
Debugger("panic")
Stopped at _Debugger+0x35: movb $0, _in_Debugger.98
db> trace
_Debugger() at _Debugger+0x35
_panic() at _panic+0x9f
_ffs_blkfree() at _ffs_blkfree+0xc2
_ffs_reallocblks() at _ffs_reallocblks+0x420
_cluster_write() at _cluster_write+0x15f
_ffs_write() at _ffs_write+0x56f
_vn_write() at _vn_write+0xef
_write() at _write+0xba
_syscall() at _syscall+0x187
_Xinit0x80_syscall at _Xinit0x80_syscall+0x4c
db>panic
panic: from debugger
mp_lock = 01000002; cpuid = 1; lapic.id = 00000000
boot() called on CPU #1
(da1:ahc0:0:2:0) SYNCHRONIZE CACHE. CDB: 35 0 0 0 0 0 0 0 0 0
(da1:ahc0:0:2:0) error code 0
dumping to dev 409, offset 907232
Fatal trap 12: page fault while in kernel mode
mp_lock = 01000003; cpuid = 1; lapic.id = 00000000
fault virtual address = 0x20
fault code = supervisor read, page not present
instruction pointer = 0x8:0x20
stack pointer = 0x10:0xf9232998
frame pointer = 0x10:0x0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32, 1, gran 1
process eflags = interrupt enabled, resume, IOPL = 0
current process = 95350 (procmail)
interrupt mask = net tty bio cam <- SMP: XXX
kernel: type 12 trap, code = 0
Stopped at _Debugger+0x35: movb $0,_in_Debugger.98
db> panic
Reach for reset button.
I have tried
dumpon /dev/da0s1b
dumpon /dev/da1s1b
With appropriate disklabels, these are swap partitions of 500 and 700 MBs.
My last attempt was
dumpon -v /dev/da1b
dumpon: crash dumps to /dev/da1b (4, 9)
--
Steve
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