Date: Fri, 10 Dec 2021 10:43:19 -0600 From: Larry Rosenman <ler@lerctr.org> To: Alexander Motin <mav@freebsd.org> Cc: Freebsd current <freebsd-current@freebsd.org> Subject: Re: Panic: Page Fault in Kernel: Yesterday's CURRENT Message-ID: <b73464cb07d071b35590e7ee22bae88a@lerctr.org> In-Reply-To: <9852ae04-6dd0-1cd4-13fe-e97c68e71b37@FreeBSD.org> References: <3d1b5249a2c51670de496fad9e8b054c@lerctr.org> <9852ae04-6dd0-1cd4-13fe-e97c68e71b37@FreeBSD.org>
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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
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)
>>
>> ------------------------------------------------------------------------
>>
--
Larry Rosenman http://www.lerctr.org/~ler
Phone: +1 214-642-9640 E-Mail: ler@lerctr.org
US Mail: 5708 Sabbia Dr, Round Rock, TX 78665-2106
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