Date: Fri, 1 Nov 2002 18:06:07 -0800 From: Kris Kennaway <kris@obsecurity.org> To: sos@FreeBSD.org, current@FreeBSD.org Subject: panic from dd to ATA disk Message-ID: <20021102020607.GA61553@xor.obsecurity.org>
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I'm getting the following panic on one of the bento cluster machines.
The machine has a single drive:
ad0: 29314MB <IBM-DTLA-307030> [59560/16/63] at ata0-master UDMA66
and I have it set up to zero the disk at boot-time (the machine boots
"diskless" via NFS):
dd if=/dev/zero of=/dev/ad0 bs=64k
load: 0.02 cmd: dd 413 [physstr] 0.01u 4.50s 0% 248k
31296+0 records in
31295+0 records out
2050949120 bytes transferred in 198.151980 secs (10350384 bytes/sec)
ad0: WRITE command timeout tag=0 serv=0 - resetting
ata0: resetting devices ..
ad0: removed from configuration
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0xdeadc0de
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01966e0
stack pointer = 0x10:0xcd235c48
frame pointer = 0x10:0xcd235c70
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 = 12 (swi6: tty:sio clock)
kernel: type 12 trap, code=0
Stopped at ad_detach+0x50: cmpl %esi,0(%ebx)
db> Context switches not allowed in the debugger.
db> trace
ad_detach(c0f18430,0,c03e028b,c2718cc0,c26dfa00) at ad_detach+0x50
ata_reinit(c0f18400,c2718cc0,c03e2333,0,0) at ata_reinit+0x9b
ad_timeout(c2718cc0,0,c03fe6cb,bf,9f43) at ad_timeout+0x158
softclock(0,0,c03fb39c,230,c0f24a80) at softclock+0x19c
ithread_loop(c0f17a00,cd235d48,c03fb0ed,354,ac64) at ithread_loop+0x182
fork_exit(c0238ab0,c0f17a00,cd235d48) at fork_exit+0xa5
fork_trampoline() at fork_trampoline+0x1a
--- trap 0x1, eip = 0, esp = 0xcd235d7c, ebp = 0 ---
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