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[Bug 1882028] Re: Unable to handle kernel paging request at virtual address on RISCV kernel when running ubuntu_ftrace_smoke_test

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: Jürg Häfliger <1882028@xxxxxxxxxxxxxxxxxx>
Date: Thu, 17 Apr 2025 22:35:12 -0000
Reply-to: Bug 1882028 <1882028@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1882028

Title:
  Unable to handle kernel paging request at virtual address on RISCV
  kernel when running ubuntu_ftrace_smoke_test

Status in ubuntu-kernel-tests:
  New
Status in linux-riscv package in Ubuntu:
  New

Bug description:
  Issue found on Focal RISCV 5.4.0-27

  When running the ubuntu_ftrace_smoke_test test, the following error message could be found in dmesg:
  [ 1491.973122] Unable to handle kernel paging request at virtual address fffffff888eea090
  [ 1491.973278] Unable to handle kernel paging request at virtual address fffffff888eea090
  [ 1491.973346] Unable to handle kernel paging request at virtual address fffffff888eea090
  [ 1491.973421] Unable to handle kernel paging request at virtual address fffffff888eea090
  [ 1491.973485] Unable to handle kernel paging request at virtual address fffffff888eea090
  [ 1491.973545] Unable to handle kernel paging request at virtual address fffffff888eea090
  [ 1491.973865] Oops [#1]
  [ 1491.973927] Unable to handle kernel paging request at virtual address fffffff888eea090
  [ 1491.981391] Modules linked in: aufs ofpart redboot cmdlinepart cfi_cmdset_0001 cfi_probe cfi_util gen_probe physmap map_funcs chipreg mtd uio_pdrv_genirq uio sch_fq_codel drm drm_panel_orientation_quirks ip_tables x_tables autofs4 virtio_blk virtio_net net_failover failover
  [ 1491.984773] CPU: 3 PID: 25 Comm: migration/3 Not tainted 5.4.0-27-generic #31-Ubuntu
  [ 1491.985795] sepc: ffffffe0000b8c56 ra : ffffffe00015cc12 sp : ffffffe078035d60
  [ 1491.987039]  gp : ffffffe000d53840 tp : ffffffe078022280 t0 : 0000000000000000
  [ 1491.987967]  t1 : fffffffff4e53a0c t2 : 0000000000000018 s0 : ffffffe078035d70
  [ 1491.988996]  s1 : ffffffe0719b1bec a0 : 0000000000000000 a1 : 0000000000000000
  [ 1491.989877]  a2 : ffffffe000d691cc a3 : 0000000000000004 a4 : 0000002ad7faa680
  [ 1491.990775]  a5 : fffffff888eea088 a6 : 000000037f010229 a7 : 0000000000000000
  [ 1491.991635]  s2 : 0000000000000003 s3 : ffffffffffffffff s4 : ffffffe000d54408
  [ 1491.992550]  s5 : 0000000000000001 s6 : 0000000000000003 s7 : 0000000000000003
  [ 1491.993473]  s8 : 0000000000000002 s9 : 0000000000000004 s10: 0000000000000000
  [ 1491.994437]  s11: ffffffe0719b1bc8 t3 : 0000000000000014 t4 : 0000000000000013
  [ 1491.995360]  t5 : 0000000000000004 t6 : 0000000000000000
  [ 1491.996109] sstatus: 0000000000000100 sbadaddr: fffffff888eea090 scause: 000000000000000d
  [ 1491.997470] Oops [#2]
  [ 1491.997909] Modules linked in: aufs ofpart redboot cmdlinepart cfi_cmdset_0001 cfi_probe cfi_util gen_probe physmap map_funcs chipreg mtd uio_pdrv_genirq uio sch_fq_codel drm drm_panel_orientation_quirks ip_tables x_tables autofs4 virtio_blk virtio_net net_failover failover
  [ 1492.000565] CPU: 2 PID: 20 Comm: migration/2 Tainted: G      D           5.4.0-27-generic #31-Ubuntu
  [ 1492.001501] sepc: ffffffe0000b8c56 ra : ffffffe00015cc12 sp : ffffffe07802bd60
  [ 1492.002287]  gp : ffffffe000d53840 tp : ffffffe078027300 t0 : 0000000000000000
  [ 1492.003091]  t1 : fffffffff47d3a0c t2 : 0000000000000018 s0 : ffffffe07802bd70
  [ 1492.003983]  s1 : ffffffe0719b1bec a0 : 0000000000000000 a1 : 0000000000000000
  [ 1492.004764]  a2 : ffffffe000d691cc a3 : 0000000000000003 a4 : 0000002ad7faa680
  [ 1492.005612]  a5 : fffffff888eea088 a6 : 000000037f010229 a7 : 0000000000000000
  [ 1492.006433]  s2 : 0000000000000003 s3 : ffffffffffffffff s4 : ffffffe000d54408
  [ 1492.006746] ---[ end trace 7c8d93ec2f9285a9 ]---

  
  The test will hang:
  Running '/home/ubuntu/autotest/client/tests/ubuntu_ftrace_smoke_test/ubuntu_ftrace_smoke_test.sh'
  PASSED (CONFIG_FUNCTION_TRACER=y in /boot/config-5.4.0-27-generic)
  PASSED (CONFIG_FUNCTION_GRAPH_TRACER=y in /boot/config-5.4.0-27-generic)
  PASSED (CONFIG_STACK_TRACER=y in /boot/config-5.4.0-27-generic)
  PASSED (CONFIG_DYNAMIC_FTRACE=y in /boot/config-5.4.0-27-generic)
  PASSED all expected /sys/kernel/debug/tracing files exist
  PASSED (function_graph in /sys/kernel/debug/tracing/available_tracers)
  PASSED (function in /sys/kernel/debug/tracing/available_tracers)
  PASSED (nop in /sys/kernel/debug/tracing/available_tracers)
  (looks like it has stopped here)

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