probe-bcache[132]: unhandled signal 11 code 0x1 at 0x0038004000000004

Running http://cdimage.ubuntu.com/ubuntu-server/daily-preinstalled/20231010/mantic-preinstalled-server-riscv64.img.xz on QEMU with

qemu-system-riscv64 -machine virt -nographic -m 2048 -smp 4 -bios /usr/lib/riscv64-linux-gnu/opensbi/generic/fw_jump.bin -kernel /usr/lib/u-boot/qemu-riscv64_smode/uboot.elf -device virtio-net-device,netdev=eth0 -netdev user,id=eth0 -device virtio-rng-pci -drive file=mantic-preinstalled-server-riscv64.img,format=raw,if=virtio

a crash was reported:

Starting systemd-udevd version 253.5-1ubuntu6
[ 3.919909] probe-bcache[132]: unhandled signal 11 code 0x1 at 0x0038004000000004
[ 3.920554] CPU: 3 PID: 132 Comm: probe-bcache Not tainted 6.5.0-9-generic #9.1-Ubuntu
[ 3.921064] Hardware name: riscv-virtio,qemu (DT)
[ 3.921382] epc : 0038004000000004 ra : 00007fffadf8ac82 sp : 00007fffce174160
[ 3.921750] gp : 000055555fd56800 tp : 00007fffade18780 t0 : 0000000000001000
[ 3.922110] t1 : 000055555fd53a3c t2 : 000000000034e6b4 s0 : 00007fffae006ae0
[ 3.922422] s1 : 00007fffce174c78 a0 : 00007fffce174178 a1 : 00007fffae006ae0
[ 3.922751] a2 : 0000000000022560 a3 : 0000000000007fff a4 : 0000000000000000
[ 3.923121] a5 : 0038004000000005 a6 : 000000055557d436 a7 : 000000000000001d
[ 3.923576] s2 : 0000000000000001 s3 : 00007fffae005d80 s4 : 0000000000000003
[ 3.923913] s5 : 000055557d4352a0 s6 : ffffffffffffffff s7 : 00007fffce174160
[ 3.924251] s8 : 00007fffce174a30 s9 : 00007fffadfb86f0 s10: 00007fffce174178
[ 3.924585] s11: 00007fffce174188 t3 : 00007fffadf8abe8 t4 : 0000000000000000
[ 3.924897] t5 : 00007fffadfdda40 t6 : 00007fffadfde028
[ 3.925090] status: 0000000200004020 badaddr: 0038004000000004 cause: 000000000000000c
[ 3.933878] probe-bcache[130]: unhandled signal 11 code 0x1 at 0x0038004000000004
[ 3.934386] CPU: 1 PID: 130 Comm: probe-bcache Not tainted 6.5.0-9-generic #9.1-Ubuntu
[ 3.934742] Hardware name: riscv-virtio,qemu (DT)
[ 3.934974] epc : 0038004000000004 ra : 00007fff9b9acc82 sp : 00007fffe3a88160
[ 3.935316] gp : 0000555591f30800 tp : 00007fff9b83a780 t0 : 0000000000001000
[ 3.935869] t1 : 0000555591f2da3c t2 : 000000000034e6b4 s0 : 00007fff9ba28ae0
[ 3.936224] s1 : 00007fffe3a88c78 a0 : 00007fffe3a88178 a1 : 00007fff9ba28ae0
[ 3.936606] a2 : 0000000000022560 a3 : 0000000000007fff a4 : 0000000000000000
[ 3.937030] a5 : 0038004000000005 a6 : 00000005555b3fa0 a7 : 000000000000001d
[ 3.937443] s2 : 0000000000000001 s3 : 00007fff9ba27d80 s4 : 0000000000000003
[ 3.937868] s5 : 00005555b3f9f2a0 s6 : ffffffffffffffff s7 : 00007fffe3a88160
[ 3.938261] s8 : 00007fffe3a88a30 s9 : 00007fff9b9da6f0 s10: 00007fffe3a88178
[ 3.938681] s11: 00007fffe3a88188 t3 : 00007fff9b9acbe8 t4 : 0000000000000000
[ 3.939113] t5 : 00007fff9b9ffa40 t6 : 00007fff9ba00028
[ 3.939469] status: 0000000200004020 badaddr: 0038004000000004 cause: 000000000000000c
[ 3.951861] probe-bcache[129]: unhandled signal 11 code 0x1 at 0x0038004000000004
[ 3.952290] CPU: 0 PID: 129 Comm: probe-bcache Not tainted 6.5.0-9-generic #9.1-Ubuntu
[ 3.952680] Hardware name: riscv-virtio,qemu (DT)
[ 3.952887] epc : 0038004000000004 ra : 00007fff86598c82 sp : 00007fffea625160
[ 3.953236] gp : 0000555574eb1800 tp : 00007fff86426780 t0 : 0000000000001000
[ 3.953582] t1 : 0000555574eaea3c t2 : 000000000034e6b4 s0 : 00007fff86614ae0
[ 3.953936] s1 : 00007fffea625c78 a0 : 00007fffea625178 a1 : 00007fff86614ae0
[ 3.954302] a2 : 0000000000022560 a3 : 0000000000007fff a4 : 0000000000000000
[ 3.954700] a5 : 0038004000000005 a6 : 000000055559411b a7 : 000000000000001d
[ 3.955114] s2 : 0000000000000001 s3 : 00007fff86613d80 s4 : 0000000000000003
[ 3.955657] s5 : 000055559411a2a0 s6 : ffffffffffffffff s7 : 00007fffea625160
[ 3.956018] s8 : 00007fffea625a30 s9 : 00007fff865c66f0 s10: 00007fffea625178
[ 3.956368] s11: 00007fffea625188 t3 : 00007fff86598be8 t4 : 0000000000000000
[ 3.956741] t5 : 00007fff865eba40 t6 : 00007fff865ec028
[ 3.957026] status: 0000000200004020 badaddr: 0038004000000004 cause: 000000000000000c
Begin: Loading essential drivers ... [ 6.255484] raid6: int64x8 gen() 635 MB/s

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: linux-image-6.5.0-9-generic 6.5.0-9.9.1
ProcVersionSignature: Ubuntu 6.5.0-9.9.1-generic 6.5.3
Uname: Linux 6.5.0-9-generic riscv64
ApportVersion: 2.27.0-0ubuntu5
Architecture: riscv64
CasperMD5CheckResult: unknown
CloudArchitecture: riscv64
CloudBuildName: server
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSerial: 20231010
CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud-net)
Date: Tue Oct 10 07:42:51 2023
ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=vt220
SourcePackage: linux-riscv
UpgradeStatus: No upgrade log present (probably fresh install)