Date: Fri, 17 Dec 2021 14:36:33 -0500 From: Mark Johnston <markj@freebsd.org> To: Larry Rosenman <ler@lerctr.org> Cc: Alexander Motin <mav@freebsd.org>, Freebsd current <freebsd-current@freebsd.org> Subject: Re: Panic: Page Fault in Kernel: Yesterday's CURRENT Message-ID: <YbzmwWidvjx9%2BjaX@nuc> In-Reply-To: <b73464cb07d071b35590e7ee22bae88a@lerctr.org> References: <3d1b5249a2c51670de496fad9e8b054c@lerctr.org> <9852ae04-6dd0-1cd4-13fe-e97c68e71b37@FreeBSD.org> <b73464cb07d071b35590e7ee22bae88a@lerctr.org>
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On Fri, Dec 10, 2021 at 10:43:19AM -0600, Larry Rosenman wrote:
> 14-2021_12_07-1217 - - 1.87G 2021-12-07 12:17
> 14-2021_12_09-1957 NR / 121G 2021-12-09 19:57
>
> If that's any help
I can't tell what this is saying. A kernel built on the 7th does not
crash, or...? Which revision did you update from before you started
seeing crashes?
>From a kgdb session it'd be useful to see output from
(kgdb) frame 8
(kgdb) p/x *tmp
to start.
> On 12/10/2021 10:36 am, Alexander Motin wrote:
> > Hi Larry,
> >
> > This looks like some use-after-free or otherwise corrupted callout
> > structure. Unfortunately the backtrace does not tell what was the
> > callout. When was the previous update to look what could change?
> >
> > On 10.12.2021 11:24, Larry Rosenman wrote:
> >> FreeBSD borg.lerctr.org 14.0-CURRENT FreeBSD 14.0-CURRENT #15
> >> main-n251537-ab639f2398b: Thu Dec 9 19:45:37 CST 2021
> >> root@borg.lerctr.org:/usr/obj/usr/src/amd64.amd64/sys/LER-MINIMAL
> >> amd64
> >>
> >> VMCORE *IS* available.
> >>
> >>
> >>
> >>
> >> Unread portion of the kernel message buffer:
> >> kernel trap 12 with interrupts disabled
> >>
> >>
> >> Fatal trap 12: page fault while in kernel mode
> >> cpuid = 0; apic id = 20
> >> fault virtual address = 0x0
> >> fault code = supervisor write data, page not present
> >> instruction pointer = 0x20:0xffffffff804e0db4
> >> stack pointer = 0x0:0xfffffe0434de4e10
> >> frame pointer = 0x0:0xfffffe0434de4e70
> >> code segment = base 0x0, limit 0xfffff, type 0x1b
> >> = DPL 0, pres 1, long 1, def32 0, gran 1
> >> processor eflags = resume, IOPL = 0
> >> current process = 82990 (c++)
> >> trap number = 12
> >> panic: page fault
> >> cpuid = 0
> >> time = 1639111198
> >> KDB: stack backtrace:
> >> #0 0xffffffff8050fc95 at kdb_backtrace+0x65
> >> #1 0xffffffff804c468f at vpanic+0x17f
> >> #2 0xffffffff804c4503 at panic+0x43
> >> #3 0xffffffff807a2195 at trap_fatal+0x385
> >> #4 0xffffffff807a21ef at trap_pfault+0x4f
> >> #5 0xffffffff80779c78 at calltrap+0x8
> >> #6 0xffffffff8045ddb8 at handleevents+0x188
> >> #7 0xffffffff8045ea3e at timercb+0x24e
> >> #8 0xffffffff807ca9eb at lapic_handle_timer+0x9b
> >> #9 0xffffffff8077b9b1 at Xtimerint+0xb1
> >> Uptime: 2h28m57s
> >> Dumping 12829 out of 131023
> >> MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%
> >>
> >> __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
> >> 55 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n"
> >> (offsetof(struct pcpu,
> >> (kgdb) #0 __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
> >> #1 doadump (textdump=<optimized out>)
> >> at /usr/src/sys/kern/kern_shutdown.c:399
> >> #2 0xffffffff804c428c in kern_reboot (howto=260)
> >> at /usr/src/sys/kern/kern_shutdown.c:487
> >> #3 0xffffffff804c46fe in vpanic (fmt=0xffffffff807e1276 "%s",
> >> ap=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:920
> >> #4 0xffffffff804c4503 in panic (fmt=<unavailable>)
> >> at /usr/src/sys/kern/kern_shutdown.c:844
> >> #5 0xffffffff807a2195 in trap_fatal (frame=0xfffffe0434de4d50, eva=0)
> >> at /usr/src/sys/amd64/amd64/trap.c:946
> >> #6 0xffffffff807a21ef in trap_pfault (frame=0xfffffe0434de4d50,
> >> usermode=false, signo=<optimized out>, ucode=<optimized out>)
> >> at /usr/src/sys/amd64/amd64/trap.c:765
> >> #7 <signal handler called>
> >> #8 0xffffffff804e0db4 in callout_process
> >> (now=now@entry=38385536922300)
> >> at /usr/src/sys/kern/kern_timeout.c:488
> >> #9 0xffffffff8045ddb8 in handleevents (now=now@entry=38385536922300,
> >> fake=fake@entry=0) at /usr/src/sys/kern/kern_clocksource.c:213
> >> #10 0xffffffff8045ea3e in timercb (et=0xffffffff80d475e0 <lapic_et>,
> >> arg=<optimized out>) at /usr/src/sys/kern/kern_clocksource.c:357
> >> #11 0xffffffff807ca9eb in lapic_handle_timer
> >> (frame=0xfffffe0434de4f40)
> >> at /usr/src/sys/x86/x86/local_apic.c:1364
> >> #12 <signal handler called>
> >> #13 0x000000080df42bb6 in ?? ()
> >> Backtrace stopped: Cannot access memory at address 0x7ffffdef2c90
> >> (kgdb)
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