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Date:      Fri, 13 Dec 2024 16:14:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 283312] Kernel crash in sched_switch
Message-ID:  <bug-283312-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283312

            Bug ID: 283312
           Summary: Kernel crash in sched_switch
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: alexey@ocaml.nl

I have no idea how to reproduce this, but since upgrading to 14.2-RELEASE, I
have been getting crashes occasionally. The same computer was running before
13.2-RELEASE, 14.0-RELEASE, 14.1-RELEASE, and 14-STABLE, and I saw no such
crashes.

What I see in dmesg output is:

Fatal trap 12: page fault while in user mode
cpuid = 6; apic id = 06
fault virtual address   = 0x542350
fault code              = user read instruction, reserved bits in PTE
instruction pointer     = 0x43:0x542350
stack pointer           = 0x3b:0x8219fdae8
frame pointer           = 0x3b:0x8219fdb90
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 3, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 96419 (pkg-static)
rdi: 00000008219fe5b0 rsi: 00000008219fdc78 rdx: 00000008219fdc90
rcx: 0000000000000041  r8: 0000000000000081  r9: 0000000000000000
rax: 00002fae2698c588 rbx: 00000008219fdbe8 rbp: 00000008219fdb90
r10: 00000008219fdc78 r11: 000000000000004e r12: 0000000000000103
r13: 00000008219fdd18 r14: 00000008219fdc78 r15: 00000008219fdc90
trap number             = 12
panic: page fault
cpuid = 6
time = 1734089856
KDB: stack backtrace:
#0 0xffffffff80b8b89d at kdb_backtrace+0x5d
#1 0xffffffff80b3dc01 at vpanic+0x131
#2 0xffffffff80b3dac3 at panic+0x43
#3 0xffffffff81025a0b at trap_fatal+0x40b
#4 0xffffffff81025a56 at trap_pfault+0x46
#5 0xffffffff810251fb at trap+0x4ab
#6 0xffffffff80ffc398 at calltrap+0x8
Uptime: 9d17h46m22s

Here is what kgdb says:

sched_switch (td=td@entry=0xffffffff81b6eb20 <thread0_st>,
    flags=flags@entry=259) at /usr/src/sys/kern/sched_ule.c:2290
2290                    cpuid = td->td_oncpu = PCPU_GET(cpuid);
(kgdb) backtrace
#0  sched_switch (td=td@entry=0xffffffff81b6eb20 <thread0_st>,
    flags=flags@entry=259) at /usr/src/sys/kern/sched_ule.c:2290
#1  0xffffffff80b4adeb in mi_switch (flags=flags@entry=259)
    at /usr/src/sys/kern/kern_synch.c:548
#2  0xffffffff80b9b320 in sleepq_switch (
    wchan=wchan@entry=0xffffffff81b6e5b8 <proc0>, pri=pri@entry=52)
    at /usr/src/sys/kern/subr_sleepqueue.c:607
#3  0xffffffff80b9b91f in sleepq_timedwait (
    wchan=wchan@entry=0xffffffff81b6e5b8 <proc0>, pri=52)
    at /usr/src/sys/kern/subr_sleepqueue.c:689
#4  0xffffffff80b4a548 in _sleep (ident=0xffffffff81b6e5b8 <proc0>,
    lock=lock@entry=0x0, priority=priority@entry=52,
    wmesg=<optimized out>, sbt=42949670000, pr=pr@entry=0, flags=256)
    at /usr/src/sys/kern/kern_synch.c:219
#5  0xffffffff80ee3779 in swapper () at /usr/src/sys/vm/vm_swapout.c:753
#6  0xffffffff8037d023 in btext () at /usr/src/sys/amd64/amd64/locore.S:88

Let me know if I can help debug it somehow.

P.S. Intel Core i3-12100F; 64 Gb RAM.

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