[Bug 259084] Panic while kill -9 syslogd

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 11 Oct 2021 22:29:06 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259084

            Bug ID: 259084
           Summary: Panic while kill -9 syslogd
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pen@lysator.liu.se

Just noticed one of our servers had many "hanging" ntpd processes. Tried to
kill them and then noticed many <defunct> processes that seemed to be created
by syslogd. Tried to kill syslogd to restart it, then the kernel paniced...

atal trap 12: page fault while in kernel mode
cpuid = 20; apic id = 14
fault virtual address   = 0x410
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80b9f55c
stack pointer           = 0x28:0xfffffe14debc6710
frame pointer           = 0x28:0xfffffe14debc6790
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 9277 (sshd)
trap number             = 12
panic: page fault
cpuid = 20
time = 1633990484
KDB: stack backtrace:
#0 0xffffffff80c0ad75 at kdb_backtrace+0x65
#1 0xffffffff80bbf02b at vpanic+0x17b
#2 0xffffffff80bbeea3 at panic+0x43
#3 0xffffffff8108e911 at trap_fatal+0x391
#4 0xffffffff8108e96f at trap_pfault+0x4f
#5 0xffffffff8108dfb6 at trap+0x286
#6 0xffffffff81066c28 at calltrap+0x8
#7 0xffffffff80c6365f at unp_pcb_owned_lock2_slowpath+0x12f
#8 0xffffffff80c61e0f at uipc_send+0x139f
#9 0xffffffff80c55b7a at sosend_generic+0x4ca
#10 0xffffffff80c55f90 at sosend+0x50
#11 0xffffffff80c5cc55 at kern_sendit+0x225
#12 0xffffffff80c5cfcc at sendit+0x19c
#13 0xffffffff80c5ce1d at sys_sendto+0x4d
#14 0xffffffff8108f4c7 at amd64_syscall+0x387
#15 0xffffffff8106754e at fast_syscall_common+0xf8
Uptime: 212d21h35m47s
mpr0: Sending StopUnit: path (xpt0:mpr0:0:20:ffffffff):

This server was running the 12.2-RELEASE-p4 kernel at the time of the crash,
uptime at some 200 days...

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