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Date:      Thu, 15 Oct 2020 08:56:48 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 250361] Kernel trap #9 in sys_semop
Message-ID:  <bug-250361-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D250361

            Bug ID: 250361
           Summary: Kernel trap #9 in sys_semop
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: o.vandestadt@gmail.com

Fatal trap 9: general protection fault while in kernel mode
cpuid =3D 0; apic id =3D 00
instruction pointer     =3D 0x20:0xffffffff80c4bff0
stack pointer           =3D 0x28:0xfffffe0013690870
frame pointer           =3D 0x28:0xfffffe0013690870
code segment            =3D base 0x0, limit 0xfffff, type 0x1b
                        =3D DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
current process         =3D 41551 (copy_db)
trap number             =3D 9
panic: general protection fault
cpuid =3D 0
time =3D 1602757996
KDB: stack backtrace:
#0 0xffffffff80c1d297 at kdb_backtrace+0x67
#1 0xffffffff80bd05cd at vpanic+0x19d
#2 0xffffffff80bd0423 at panic+0x43
#3 0xffffffff810a7d2c at trap_fatal+0x39c
#4 0xffffffff810a713c at trap+0x6c
#5 0xffffffff81081a0c at calltrap+0x8
#6 0xffffffff80c4bb99 at sys_semop+0x729
#7 0xffffffff810a88e4 at amd64_syscall+0x364
#8 0xffffffff81082330 at fast_syscall_common+0x101


Backtrace from kgdb:
(kgdb) bt
#0  __curthread () at /usr/src/sys/amd64/include/pcpu.h:234
#1  doadump (textdump=3D<optimized out>) at /usr/src/sys/kern/kern_shutdown=
.c:371
#2  0xffffffff80bd01c8 in kern_reboot (howto=3D260) at
/usr/src/sys/kern/kern_shutdown.c:451
#3  0xffffffff80bd0629 in vpanic (fmt=3D<optimized out>, ap=3D<optimized ou=
t>) at
/usr/src/sys/kern/kern_shutdown.c:877
#4  0xffffffff80bd0423 in panic (fmt=3D<unavailable>) at
/usr/src/sys/kern/kern_shutdown.c:804
#5  0xffffffff810a7d2c in trap_fatal (frame=3D0xfffffe00136907b0, eva=3D0) =
at
/usr/src/sys/amd64/amd64/trap.c:943
#6  0xffffffff810a713c in trap (frame=3D0xfffffe00136907b0) at
/usr/src/sys/amd64/amd64/trap.c:221
#7  <signal handler called>
#8  0xffffffff80c4bff0 in semu_alloc (td=3D<optimized out>) at
/usr/src/sys/kern/sysv_sem.c:420
#9  semundo_adjust (td=3D0xfffff8000fe17000, supptr=3D0xfffffe00136908e0, s=
emid=3D1,
semseq=3D1, semnum=3D0, adjval=3D1)
    at /usr/src/sys/kern/sysv_sem.c:468
#10 0xffffffff80c4bb99 in sys_semop (td=3D0xfffff8000fe17000, uap=3D<optimi=
zed
out>)
    at /usr/src/sys/kern/sysv_sem.c:1337
#11 0xffffffff810a88e4 in syscallenter (td=3D0xfffff8000fe17000)
    at /usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:135
#12 amd64_syscall (td=3D0xfffff8000fe17000, traced=3D0) at
/usr/src/sys/amd64/amd64/trap.c:1186
#13 <signal handler called>

If worth mentioning, my /boot/loader.conf contains
kern.ipc.semopm=3D300
kern.ipc.semume=3D500

System is running in a VMWare instance, in case this is relevant.

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