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

[Heinrich Schuchardt]

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)

[Heinrich Schuchardt (xypron)]

$ uname -a
Linux ubuntu 6.5.0-9-generic #9.1-Ubuntu SMP Sat Oct 7 17:18:31 UTC 2023 riscv64 riscv64 riscv64 GNU/Linux

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/2038893

[Dimitri John Ledkov (xnox)]

note that probe-bcache is just a userspace tool that is called as part of udev processing devices, and it is fairly simple tool that hardly does anything when there are no bcache devices..... so this does look suspicious.

[Heinrich Schuchardt (xypron)]

Trying again booting the preinstalled image the reported error did not come up.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.