On 7/31/23 13:31, Claudio Fontana wrote:
> On 7/21/23 11:08, Claudio Fontana wrote:
>>
>> Hello Cornelia, Richard,
>>
>> I had some strange behavior in an s390x TCG VM that I am debugging,
>>
>> and configured latest upstream QEMU with --enable-debug --enable-debug-tcg
>>
>> and I am running the qemu binary with -d unimp,guest_errors .
>>
>> I get:
>>
>> /usr/bin/qemu-system-s390x -nodefaults -no-reboot -nographic -vga none -cpu
>> qemu -d unimp,guest_errors -object rng-random,filename=/dev/random,id=rng0
>> -device virtio-rng-ccw,rng=rng0 -runas qemu -net none -kernel
>> /var/tmp/boot/kernel -initrd /var/tmp/boot/initrd -append
>> root=/dev/disk/by-id/virtio-0 rootfstype=ext3
>> rootflags=data=writeback,nobarrier,commit=150,noatime elevator=noop
>> nmi_watchdog=0 rw oops=panic panic=1 quiet elevator=noop console=hvc0
>> init=build -m 2048 -drive
>> file=/var/tmp/img,format=raw,if=none,id=disk,cache=unsafe -device
>> virtio-blk-ccw,drive=disk,serial=0 -drive
>> file=/var/tmp/swap,format=raw,if=none,id=swap,cache=unsafe -device
>> virtio-blk-ccw,drive=swap,serial=1 -device virtio-serial-ccw -device
>> virtconsole,chardev=virtiocon0 -chardev stdio,id=virtiocon0 -chardev
>> socket,id=monitor,server=on,wait=off,path=/var/tmp/img.qemu/monitor -mon
>> chardev=monitor,mode=readline -smp 8
>>
>> unimplemented opcode 0xb9ab
>> unimplemented opcode 0xb2af
>>
>> ERROR:../accel/tcg/tb-maint.c:348:page_unlock__debug: assertion failed:
>> (page_is_locked(pd))
>> Bail out! ERROR:../accel/tcg/tb-maint.c:348:page_unlock__debug: assertion
>> failed: (page_is_locked(pd))
>>
>> Thread 3 "qemu-system-s39" received signal SIGABRT, Aborted.
>> [Switching to Thread 0x7ffff53516c0 (LWP 215975)]
>> (gdb) bt
>> #0 0x00007ffff730dabc in __pthread_kill_implementation () at
>> /lib64/libc.so.6
>> #1 0x00007ffff72bc266 in raise () at /lib64/libc.so.6
>> #2 0x00007ffff72a4897 in abort () at /lib64/libc.so.6
>> #3 0x00007ffff76f0eee in () at /lib64/libglib-2.0.so.0
>> #4 0x00007ffff775649a in g_assertion_message_expr () at
>> /lib64/libglib-2.0.so.0
>> #5 0x0000555555b96134 in page_unlock__debug (pd=0x7ffee8680440) at
>> ../accel/tcg/tb-maint.c:348
>> #6 0x0000555555b962a9 in page_unlock (pd=0x7ffee8680440) at
>> ../accel/tcg/tb-maint.c:397
>> #7 0x0000555555b96580 in tb_unlock_pages (tb=0x7fffefffeb00) at
>> ../accel/tcg/tb-maint.c:483
>> #8 0x0000555555b94698 in cpu_exec_longjmp_cleanup (cpu=0x555556566a30) at
>> ../accel/tcg/cpu-exec.c:556
>> #9 0x0000555555b954e0 in cpu_exec_setjmp (cpu=0x555556566a30,
>> sc=0x7ffff5350540) at ../accel/tcg/cpu-exec.c:1054
>> #10 0x0000555555b9557a in cpu_exec (cpu=0x555556566a30) at
>> ../accel/tcg/cpu-exec.c:1083
>> #11 0x0000555555bb9af6 in tcg_cpus_exec (cpu=0x555556566a30) at
>> ../accel/tcg/tcg-accel-ops.c:75
>> #12 0x0000555555bba1ae in mttcg_cpu_thread_fn (arg=0x555556566a30) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:95
>> #13 0x0000555555dc0af3 in qemu_thread_start (args=0x5555565ba150) at
>> ../util/qemu-thread-posix.c:541
>> #14 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #15 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> (gdb) frame 5
>> #5 0x0000555555b96134 in page_unlock__debug (pd=0x7ffee8680440) at
>> ../accel/tcg/tb-maint.c:348
>> 348 g_assert(page_is_locked(pd));
>> (gdb) list 348
>> 343 static void page_unlock__debug(const PageDesc *pd)
>> 344 {
>> 345 bool removed;
>> 346
>> 347 ht_pages_locked_debug_init();
>> 348 g_assert(page_is_locked(pd));
>> 349 removed = g_hash_table_remove(ht_pages_locked_debug, pd);
>> 350 g_assert(removed);
>> 351 }
>> 352
>>
>> (gdb) info threads
>> Id Target Id Frame
>> 1 Thread 0x7ffff63bef40 (LWP 215971) "qemu-system-s39"
>> 0x00007ffff7385596 in ppoll () from /lib64/libc.so.6
>> 2 Thread 0x7ffff63bb6c0 (LWP 215974) "qemu-system-s39"
>> 0x00007ffff738b41d in syscall () from /lib64/libc.so.6
>> * 3 Thread 0x7ffff53516c0 (LWP 215975) "qemu-system-s39"
>> 0x00007ffff730dabc in __pthread_kill_implementation () from /lib64/libc.so.6
>> 4 Thread 0x7ffff4b506c0 (LWP 215976) "qemu-system-s39"
>> 0x00007ffff730820e in __futex_abstimed_wait_common () from /lib64/libc.so.6
>> 5 Thread 0x7ffeefdff6c0 (LWP 215977) "qemu-system-s39"
>> 0x00007ffff730820e in __futex_abstimed_wait_common () from /lib64/libc.so.6
>> 6 Thread 0x7ffeef5fe6c0 (LWP 215978) "qemu-system-s39"
>> 0x00007ffff730820e in __futex_abstimed_wait_common () from /lib64/libc.so.6
>> 7 Thread 0x7ffeeedfd6c0 (LWP 215979) "qemu-system-s39"
>> 0x00007ffff730820e in __futex_abstimed_wait_common () from /lib64/libc.so.6
>> 8 Thread 0x7ffeee5fc6c0 (LWP 215980) "qemu-system-s39"
>> 0x00007ffff730820e in __futex_abstimed_wait_common () from /lib64/libc.so.6
>> 9 Thread 0x7ffeeddfb6c0 (LWP 215981) "qemu-system-s39"
>> 0x00007ffff730820e in __futex_abstimed_wait_common () from /lib64/libc.so.6
>> 10 Thread 0x7ffeed5fa6c0 (LWP 215982) "qemu-system-s39"
>> 0x00007ffff730820e in __futex_abstimed_wait_common () from /lib64/libc.so.6
>>
>> (gdb) thread apply all bt
>>
>> Thread 10 (Thread 0x7ffeed5fa6c0 (LWP 215982) "qemu-system-s39"):
>> #0 0x00007ffff730820e in __futex_abstimed_wait_common () at /lib64/libc.so.6
>> #1 0x00007ffff730af50 in pthread_cond_wait@@GLIBC_2.3.2 () at
>> /lib64/libc.so.6
>> #2 0x0000555555dc02ab in qemu_cond_wait_impl (cond=0x555556803f30,
>> mutex=0x55555632aac0 <qemu_global_mutex>, file=0x555555f05d6b
>> "../softmmu/cpus.c", line=424) at ../util/qemu-thread-posix.c:225
>> #3 0x00005555559d78fb in qemu_wait_io_event (cpu=0x5555567b0600) at
>> ../softmmu/cpus.c:424
>> #4 0x0000555555bba27a in mttcg_cpu_thread_fn (arg=0x5555567b0600) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:123
>> #5 0x0000555555dc0af3 in qemu_thread_start (args=0x555556803f70) at
>> ../util/qemu-thread-posix.c:541
>> #6 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #7 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 9 (Thread 0x7ffeeddfb6c0 (LWP 215981) "qemu-system-s39"):
>> #0 0x00007ffff730820e in __futex_abstimed_wait_common () at /lib64/libc.so.6
>> #1 0x00007ffff730af50 in pthread_cond_wait@@GLIBC_2.3.2 () at
>> /lib64/libc.so.6
>> #2 0x0000555555dc02ab in qemu_cond_wait_impl (cond=0x5555567b0340,
>> mutex=0x55555632aac0 <qemu_global_mutex>, file=0x555555f05d6b
>> "../softmmu/cpus.c", line=424) at ../util/qemu-thread-posix.c:225
>> #3 0x00005555559d78fb in qemu_wait_io_event (cpu=0x55555675cb10) at
>> ../softmmu/cpus.c:424
>> #4 0x0000555555bba27a in mttcg_cpu_thread_fn (arg=0x55555675cb10) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:123
>> #5 0x0000555555dc0af3 in qemu_thread_start (args=0x5555567b0380) at
>> ../util/qemu-thread-posix.c:541
>> #6 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #7 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 8 (Thread 0x7ffeee5fc6c0 (LWP 215980) "qemu-system-s39"):
>> #0 0x00007ffff730820e in __futex_abstimed_wait_common () at /lib64/libc.so.6
>> #1 0x00007ffff730af50 in pthread_cond_wait@@GLIBC_2.3.2 () at
>> /lib64/libc.so.6
>> #2 0x0000555555dc02ab in qemu_cond_wait_impl (cond=0x55555675c850,
>> mutex=0x55555632aac0 <qemu_global_mutex>, file=0x555555f05d6b
>> "../softmmu/cpus.c", line=424) at ../util/qemu-thread-posix.c:225
>> #3 0x00005555559d78fb in qemu_wait_io_event (cpu=0x5555567090f0) at
>> ../softmmu/cpus.c:424
>> #4 0x0000555555bba27a in mttcg_cpu_thread_fn (arg=0x5555567090f0) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:123
>> #5 0x0000555555dc0af3 in qemu_thread_start (args=0x55555675c890) at
>> ../util/qemu-thread-posix.c:541
>> #6 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #7 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 7 (Thread 0x7ffeeedfd6c0 (LWP 215979) "qemu-system-s39"):
>> #0 0x00007ffff730820e in __futex_abstimed_wait_common () at /lib64/libc.so.6
>> #1 0x00007ffff730af50 in pthread_cond_wait@@GLIBC_2.3.2 () at
>> /lib64/libc.so.6
>> #2 0x0000555555dc02ab in qemu_cond_wait_impl (cond=0x555556708e50,
>> mutex=0x55555632aac0 <qemu_global_mutex>, file=0x555555f05d6b
>> "../softmmu/cpus.c", line=424) at ../util/qemu-thread-posix.c:225
>> #3 0x00005555559d78fb in qemu_wait_io_event (cpu=0x5555566b5490) at
>> ../softmmu/cpus.c:424
>> #4 0x0000555555bba27a in mttcg_cpu_thread_fn (arg=0x5555566b5490) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:123
>> #5 0x0000555555dc0af3 in qemu_thread_start (args=0x555556708e90) at
>> ../util/qemu-thread-posix.c:541
>> #6 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #7 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 6 (Thread 0x7ffeef5fe6c0 (LWP 215978) "qemu-system-s39"):
>> #0 0x00007ffff730820e in __futex_abstimed_wait_common () at /lib64/libc.so.6
>> #1 0x00007ffff730af50 in pthread_cond_wait@@GLIBC_2.3.2 () at
>> /lib64/libc.so.6
>> #2 0x0000555555dc02ab in qemu_cond_wait_impl (cond=0x5555566b51d0,
>> mutex=0x55555632aac0 <qemu_global_mutex>, file=0x555555f05d6b
>> "../softmmu/cpus.c", line=424) at ../util/qemu-thread-posix.c:225
>> #3 0x00005555559d78fb in qemu_wait_io_event (cpu=0x5555566619a0) at
>> ../softmmu/cpus.c:424
>> #4 0x0000555555bba27a in mttcg_cpu_thread_fn (arg=0x5555566619a0) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:123
>> #5 0x0000555555dc0af3 in qemu_thread_start (args=0x5555566b5210) at
>> ../util/qemu-thread-posix.c:541
>> #6 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #7 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 5 (Thread 0x7ffeefdff6c0 (LWP 215977) "qemu-system-s39"):
>> #0 0x00007ffff730820e in __futex_abstimed_wait_common () at /lib64/libc.so.6
>> #1 0x00007ffff730af50 in pthread_cond_wait@@GLIBC_2.3.2 () at
>> /lib64/libc.so.6
>> #2 0x0000555555dc02ab in qemu_cond_wait_impl (cond=0x5555566616e0,
>> mutex=0x55555632aac0 <qemu_global_mutex>, file=0x555555f05d6b
>> "../softmmu/cpus.c", line=424) at ../util/qemu-thread-posix.c:225
>> #3 0x00005555559d78fb in qemu_wait_io_event (cpu=0x55555660deb0) at
>> ../softmmu/cpus.c:424
>> #4 0x0000555555bba27a in mttcg_cpu_thread_fn (arg=0x55555660deb0) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:123
>> #5 0x0000555555dc0af3 in qemu_thread_start (args=0x555556661720) at
>> ../util/qemu-thread-posix.c:541
>> #6 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #7 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 4 (Thread 0x7ffff4b506c0 (LWP 215976) "qemu-system-s39"):
>> #0 0x00007ffff730820e in __futex_abstimed_wait_common () at /lib64/libc.so.6
>> #1 0x00007ffff730af50 in pthread_cond_wait@@GLIBC_2.3.2 () at
>> /lib64/libc.so.6
>> #2 0x0000555555dc02ab in qemu_cond_wait_impl (cond=0x55555660dbf0,
>> mutex=0x55555632aac0 <qemu_global_mutex>, file=0x555555f05d6b
>> "../softmmu/cpus.c", line=424) at ../util/qemu-thread-posix.c:225
>> #3 0x00005555559d78fb in qemu_wait_io_event (cpu=0x5555565ba3d0) at
>> ../softmmu/cpus.c:424
>> #4 0x0000555555bba27a in mttcg_cpu_thread_fn (arg=0x5555565ba3d0) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:123
>> #5 0x0000555555dc0af3 in qemu_thread_start (args=0x55555660dc30) at
>> ../util/qemu-thread-posix.c:541
>> #6 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #7 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 3 (Thread 0x7ffff53516c0 (LWP 215975) "qemu-system-s39"):
>> #0 0x00007ffff730dabc in __pthread_kill_implementation () at
>> /lib64/libc.so.6
>> #1 0x00007ffff72bc266 in raise () at /lib64/libc.so.6
>> #2 0x00007ffff72a4897 in abort () at /lib64/libc.so.6
>> #3 0x00007ffff76f0eee in () at /lib64/libglib-2.0.so.0
>> #4 0x00007ffff775649a in g_assertion_message_expr () at
>> /lib64/libglib-2.0.so.0
>> #5 0x0000555555b96134 in page_unlock__debug (pd=0x7ffee8680440) at
>> ../accel/tcg/tb-maint.c:348
>> #6 0x0000555555b962a9 in page_unlock (pd=0x7ffee8680440) at
>> ../accel/tcg/tb-maint.c:397
>> #7 0x0000555555b96580 in tb_unlock_pages (tb=0x7fffefffeb00) at
>> ../accel/tcg/tb-maint.c:483
>> #8 0x0000555555b94698 in cpu_exec_longjmp_cleanup (cpu=0x555556566a30) at
>> ../accel/tcg/cpu-exec.c:556
>> #9 0x0000555555b954e0 in cpu_exec_setjmp (cpu=0x555556566a30,
>> sc=0x7ffff5350540) at ../accel/tcg/cpu-exec.c:1054
>> #10 0x0000555555b9557a in cpu_exec (cpu=0x555556566a30) at
>> ../accel/tcg/cpu-exec.c:1083
>> #11 0x0000555555bb9af6 in tcg_cpus_exec (cpu=0x555556566a30) at
>> ../accel/tcg/tcg-accel-ops.c:75
>> #12 0x0000555555bba1ae in mttcg_cpu_thread_fn (arg=0x555556566a30) at
>> ../accel/tcg/tcg-accel-ops-mttcg.c:95
>> #13 0x0000555555dc0af3 in qemu_thread_start (args=0x5555565ba150) at
>> ../util/qemu-thread-posix.c:541
>> #14 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #15 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 2 (Thread 0x7ffff63bb6c0 (LWP 215974) "qemu-system-s39"):
>> #0 0x00007ffff738b41d in syscall () at /lib64/libc.so.6
>> #1 0x0000555555dc0759 in qemu_futex_wait (f=0x555556352818
>> <rcu_call_ready_event>, val=4294967295) at
>> /root/git/qemu/include/qemu/futex.h:29
>> #2 0x0000555555dc0940 in qemu_event_wait (ev=0x555556352818
>> <rcu_call_ready_event>) at ../util/qemu-thread-posix.c:464
>> #3 0x0000555555dcd228 in call_rcu_thread (opaque=0x0) at ../util/rcu.c:278
>> #4 0x0000555555dc0af3 in qemu_thread_start (args=0x5555563bdf20) at
>> ../util/qemu-thread-posix.c:541
>> #5 0x00007ffff730bc64 in start_thread () at /lib64/libc.so.6
>> #6 0x00007ffff7393550 in clone3 () at /lib64/libc.so.6
>>
>> Thread 1 (Thread 0x7ffff63bef40 (LWP 215971) "qemu-system-s39"):
>> #0 0x00007ffff7385596 in ppoll () at /lib64/libc.so.6
>> #1 0x0000555555dde228 in qemu_poll_ns (fds=0x55555680ae50, nfds=75,
>> timeout=9378142) at ../util/qemu-timer.c:351
>> #2 0x0000555555dd9b50 in os_host_main_loop_wait (timeout=9378142) at
>> ../util/main-loop.c:308
>> #3 0x0000555555dd9c7f in main_loop_wait (nonblocking=0) at
>> ../util/main-loop.c:592
>> #4 0x00005555559e5c3e in qemu_main_loop () at ../softmmu/runstate.c:732
>> #5 0x0000555555bbff42 in qemu_default_main () at ../softmmu/main.c:37
>> #6 0x0000555555bbff78 in main (argc=46, argv=0x7fffffffe278) at
>> ../softmmu/main.c:48
>>
>> ----
>
> Hi Richard,
>
> with the two patches:
>
> accel/tcg: Clear tcg_ctx->gen_tb on buffer overflow
>
> and
>
> target/s390x: Move trans_exc_code update to do_program_interrupt
>
> I do not get asserts anymore.
>
> I did notice though some error happening once, that I never saw before when I
> was running without these patches (and without --enable-debug-tcg, so I would
> not get asserts).
>
> I have "-d unimp,guest_errors" currently in the cmdline.
>
> unimplemented opcode 0x0000
> [ 87.544553][ T320] illegal operation: 0001 ilc:1 [#1] SMP
> [ 87.546245][ T320] Modules linked in: virtio_blk(+) xfs btrfs
> blake2b_generic xor raid6_pq libcrc32c ext4 crc32_vx_s390 crc16 mbcache jbd2
> squashfs lz4_decompress fuse dm_snapshot dm_bufio dm_crypt essiv authenc
> dm_mod binfmt_misc loop sg scsi_mod
> [ 87.550754][ T320] Supported: Yes
> [ 87.552441][ T320] CPU: 4 PID: 320 Comm: modprobe Not tainted
> 5.14.21-150400.22-default #1 SLE15-SP4
> a8270a81de044ce12d2ba9b360e3443bea691c52
> [ 87.554408][ T320] Hardware name: QEMU 8561 QEMU (KVM/Linux)
> [ 87.555528][ T320] Krnl PSW : 0704e00180000000 000003ff80580002
> (____versions+0x7f80240c6a/0x7f802411f8 [virtio_blk])
> [ 87.557435][ T320] R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3
> CC:2 PM:0 RI:0 EA:3
> [ 87.558866][ T320] Krnl GPRS: 0000000007ca7520 000003ff805805d8
> 000000000400f030 0000000007c40000
> [ 87.559938][ T320] 0000000000000000 0000000000000000
> 0000000000000000 000000000400f030
> [ 87.561557][ T320] 0000000007ca7480 0000000000000007
> 0000000000000000 0000000007c40000
> [ 87.562821][ T320] 0000000002dfa100 0000000000002200
> 000003ff805805de 000003800033b6d8
> [ 87.566124][ T320] Krnl Code:#000003ff80580000: 0000
> illegal
> [ 87.566124][ T320] >000003ff80580002: 0000
> illegal
> [ 87.566124][ T320] 000003ff80580004: 011a
> unknown
> [ 87.566124][ T320] 000003ff80580006: c1f800000000
> unknown
> [ 87.566124][ T320] 000003ff8058000c: 00fa
> unknown
> [ 87.566124][ T320] 000003ff8058000e: c1a800000000
> unknown
> [ 87.566124][ T320] 000003ff80580014: 00fd
> unknown
> [ 87.566124][ T320] 000003ff80580016: 6c500d10 md
> %f5,3344
> [ 87.573838][ T320] Call Trace:
> [ 87.576335][ T320] [<000003ff80580002>]
> ____versions+0x7f80240c6a/0x7f802411f8 [virtio_blk]
> [ 87.577717][ T320] ([<00000000005cf7d6>] blk_mq_alloc_rqs+0xfe/0x2a8)
> [ 87.578756][ T320] [<00000000005cf9fe>]
> __blk_mq_alloc_map_and_request+0x7e/0x100
> [ 87.579829][ T320] [<00000000005d09be>] blk_mq_alloc_tag_set+0x266/0x3b8
> [ 87.580847][ T320] [<000003ff80581b62>] virtblk_probe+0x3d2/0xb88
> [virtio_blk]
> [ 87.582545][ T320] [<00000000006ddb12>] virtio_dev_probe+0x192/0x360
> [ 87.583506][ T320] [<000000000072d2e2>] really_probe+0x1c2/0x490
> [ 87.584357][ T320] [<000000000072d768>] driver_probe_device+0x40/0xf8
> [ 87.585248][ T320] [<000000000072ddf6>] __driver_attach+0x86/0x198
> [ 87.586055][ T320] [<000000000072a8fa>] bus_for_each_dev+0x82/0xc8
> [ 87.586964][ T320] [<000000000072c130>] bus_add_driver+0x170/0x258
> [ 87.587767][ T320] [<000000000072e608>] driver_register+0x88/0x160
> [ 87.588631][ T320] [<000003ff8058706a>] init+0x6a/0x1000 [virtio_blk]
> [ 87.589550][ T320] [<0000000000100bf0>] do_one_initcall+0x40/0x208
> [ 87.590491][ T320] [<00000000009c1620>] do_init_module+0x70/0x260
> [ 87.592186][ T320] [<000000000021e0b4>] load_module+0x1de4/0x25d0
> [ 87.593207][ T320] [<000000000021ea58>] __do_sys_init_module+0x1b8/0x1e8
> [ 87.594226][ T320] [<00000000009c570a>] __do_syscall+0x1c2/0x1e8
> [ 87.595069][ T320] [<00000000009d4a28>] system_call+0x78/0xa0
> [ 87.596053][ T320] Last Breaking-Event-Address:
> [ 87.596697][ T320] [<000000003fffe2c0>] 0x3fffe2c0
> [ 87.598784][ T320] Kernel panic - not syncing: Fatal exception:
> panic_on_oops
> Guest crashed on cpu 4: disabled-wait
> PSW: 0x0002000180000000 0x000000000010fdd0
>
> This did not manifest again when rerunning.
> Just FYI in case it helps, it might "just" be a kernel error, but I never saw
> this before when running unpatched...
>
Rebooted a number of times until now, did not reproduce. Happened only once.
C
