Date: Fri, 20 Jul 2012 21:53:42 -0400 From: Gary Palmer <gpalmer@freebsd.org> To: Trent Nelson <trent@snakebite.org> Cc: "freebsd-scsi@FreeBSD.org" <freebsd-scsi@FreeBSD.org>, Andriy Gapon <avg@FreeBSD.org> Subject: Re: dev/isp panic (was Re: CAM Target Layer and dev/isp) Message-ID: <20120721015342.GA19321@in-addr.com> In-Reply-To: <CC2D73DE.338ED%trent@snakebite.org> References: <5007A14B.5020703@FreeBSD.org> <CC2D73DE.338ED%trent@snakebite.org>
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On Thu, Jul 19, 2012 at 05:22:21AM -0700, Trent Nelson wrote: > On 7/19/12 1:55 AM, "Andriy Gapon" <avg@FreeBSD.org> wrote: > > >on 18/07/2012 17:00 Matthew Jacob said the following: > >> -------------- > >> > >> db> bt > >> Tracing pid 12 tid 100062 td 0xfffffe001c00f470 > >> acpi_timer_get_timecount() at 0xffffffff803ccfc6 = > >> acpi_timer_get_timecount+0x16 > >> DELAY() at 0xffffffff80ce68c3 = DELAY+0x83 > >> ns8250_putc() at 0xffffffff807a17ba = ns8250_putc+0x9a > >> uart_cnputc() at 0xffffffff807a3b85 = uart_cnputc+0x75 > >> cnputc() at 0xffffffff808e9cbc = cnputc+0x4c > >> cnputs() at 0xffffffff808ea0f5 = cnputs+0x35 > >> putbuf() at 0xffffffff8097400c = putbuf+0xac > >> kvprintf() at 0xffffffff80972643 = kvprintf+0x83 > >> vprintf() at 0xffffffff80973b15 = vprintf+0x85 > >> printf() at 0xffffffff80973be7 = printf+0x67 > >> isp_prt() at 0xffffffff805c15a0 = isp_prt+0xd0 > >> isp_async() at 0xffffffff805c6736 = isp_async+0x356 > >> isp_intr() at 0xffffffff805b854c = isp_intr+0x13ac > >> isp_platform_intr() at 0xffffffff805c1fd9 = isp_platform_intr+0x99 > >> intr_event_execute_handlers() at 0xffffffff80907214 = > >> intr_event_execute_handlers+0x104 > >> ithread_loop() at 0xffffffff809089a6 = ithread_loop+0xa6 > >> fork_exit() at 0xffffffff809038ef = fork_exit+0x11f > >> fork_trampoline() at 0xffffffff80c5139e = fork_trampoline+0xe > >> --- trap 0, rip = 0, rsp = 0xffffff9178bd3cf0, rbp = 0 --- > >> db> x/s panicstr > >> 0xffffffff8130fd08 = panicstr: > >> > >> > >> ------------- > >> > >> Hmm. No panic string because it wasn't a panic. isp driver is trying to > >> (successfully) print something and this blew up in the ACPI code. If > >>there was a > >> bad string it would have blown up in kvprintf. At least that's my read > >>of this. > > > >I think that the vague reference to ACPI is unnecessarily too vague, > >given the > >quite obvious stack trace (hint: DELAY) and both simplicity and utility of > >acpi_timer_get_timecount (essentially an I/O read operation). > >But there is no indication in the above stack trace that something blew > >up at > >all (no magic words like "panic", "trap"). > > Hrm. What else would cause 'db>' to show up on the console? Ctrl-Alt-Esc > and hitting a breakpoint are all I can think of at the moment -- and > neither of those are applicable here. Is there a serial console attached? Sending BREAK via serial can also do it (or used to anyway), and some terminal servers send BREAK when they reset/reboot. The fact you were in ns8250_putc() could point at a serial port issue. Gary
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