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[Bug 2110469] [NEW] WARNING: CPU: 6 PID: 1 at arch/arm64/mm/ioremap.c:16 ioremap_prot+0x84/0xa0

To: canonical-ubuntu-qa@xxxxxxxxxxxxxxxxxxx
From: GuoqingJiang <2110469@xxxxxxxxxxxxxxxxxx>
Date: Mon, 12 May 2025 09:30:37 -0000
Reply-to: Bug 2110469 <2110469@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Public bug reported:

The similar call trace happened for both n:linux-hwe-6.11 (on alekhin
with Hardware name: GIGABYTE R120-T30-V6-A/MT30-GS3-V6, BIOS T48
10/02/2017) and n:linux-lowlatency-hwe-6.11 (on couder) in 2025.04.14
cycle.

couder kernel: simple-framebuffer simple-framebuffer.0: [drm] could not acquire memory region [mem 0x10000000-0x102fffff flags 0x200]
couder kernel: ------------[ cut here ]------------
couder kernel: WARNING: CPU: 6 PID: 1 at arch/arm64/mm/ioremap.c:16 ioremap_prot+0x84/0xa0
couder kernel: Modules linked in:
couder kernel: CPU: 6 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.11.0-1014-lowlatency-64k #15~24.04.1-Ubuntu
couder kernel: Hardware name: GIGABYTE R120-T33/MT30-GS1, BIOS T31 02/14/2017
couder kernel: pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
couder kernel: pc : ioremap_prot+0x84/0xa0
couder kernel: lr : ioremap_prot+0x48/0xa0
couder kernel: sp : ffff8000849cf7f0
couder kernel: x29: ffff8000849cf7f0 x28: ffff00014062a000 x27: 0000000000001000
couder kernel: x26: ffff00014062a000 x25: 0000000000000400 x24: 0000000000000000
couder kernel: x23: 0000000010000000 x22: 0000000000300000 x21: 006800000000070b
couder kernel: x20: 0000000000300000 x19: 0000000010000000 x18: ffff8000849e00a8
couder kernel: x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
couder kernel: x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
couder kernel: x11: 0000000000000000 x10: 0000000000000000 x9 : ffff80008003ca08
couder kernel: x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
couder kernel: x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
couder kernel: x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000001
couder kernel: Call trace:
couder kernel:  ioremap_prot+0x84/0xa0
couder kernel:  devm_ioremap_wc+0x80/0x130
couder kernel:  simpledrm_device_create.constprop.0+0x814/0xaf0
couder kernel:  simpledrm_probe+0x20/0xb8
couder kernel:  platform_probe+0x74/0x118
couder kernel:  really_probe+0xd8/0x3e8
couder kernel:  __driver_probe_device+0x94/0x1c8
couder kernel:  driver_probe_device+0x48/0x188
couder kernel:  __device_attach_driver+0x114/0x220
couder kernel:  bus_for_each_drv+0x94/0x118
couder kernel:  __device_attach+0xac/0x208
couder kernel:  device_initial_probe+0x20/0x48
couder kernel:  bus_probe_device+0xcc/0xd8
couder kernel:  device_add+0x538/0x738
couder kernel:  platform_device_add+0x1e4/0x308
couder kernel:  sysfb_create_simplefb+0x1ac/0x1c8
couder kernel:  sysfb_init+0x1b0/0x200
couder kernel:  do_one_initcall+0x64/0x388
couder kernel:  do_initcalls+0x13c/0x2d8
couder kernel:  kernel_init_freeable+0x134/0x2a8

[1] http://test-results.kernel/2025.04.14/noble/linux-
hwe-6.11/6.11.0-26.26~24.04.1/boot-generic-64k-testflinger-arm-
server.arm64-ubuntu_boot-log.html#log_check-start

[2] http://test-results.kernel/2025.04.14/noble/linux-lowlatency-
hwe-6.11/6.11.0-1014.15~24.04.1/boot-lowlatency-64k-testflinger-arm-
server.arm64-ubuntu_boot-log.html#log_check-start

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2110469

Title:
   WARNING: CPU: 6 PID: 1 at arch/arm64/mm/ioremap.c:16
  ioremap_prot+0x84/0xa0

Status in ubuntu-kernel-tests:
  New

Bug description:
  The similar call trace happened for both n:linux-hwe-6.11 (on alekhin
  with Hardware name: GIGABYTE R120-T30-V6-A/MT30-GS3-V6, BIOS T48
  10/02/2017) and n:linux-lowlatency-hwe-6.11 (on couder) in 2025.04.14
  cycle.

  couder kernel: simple-framebuffer simple-framebuffer.0: [drm] could not acquire memory region [mem 0x10000000-0x102fffff flags 0x200]
  couder kernel: ------------[ cut here ]------------
  couder kernel: WARNING: CPU: 6 PID: 1 at arch/arm64/mm/ioremap.c:16 ioremap_prot+0x84/0xa0
  couder kernel: Modules linked in:
  couder kernel: CPU: 6 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.11.0-1014-lowlatency-64k #15~24.04.1-Ubuntu
  couder kernel: Hardware name: GIGABYTE R120-T33/MT30-GS1, BIOS T31 02/14/2017
  couder kernel: pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
  couder kernel: pc : ioremap_prot+0x84/0xa0
  couder kernel: lr : ioremap_prot+0x48/0xa0
  couder kernel: sp : ffff8000849cf7f0
  couder kernel: x29: ffff8000849cf7f0 x28: ffff00014062a000 x27: 0000000000001000
  couder kernel: x26: ffff00014062a000 x25: 0000000000000400 x24: 0000000000000000
  couder kernel: x23: 0000000010000000 x22: 0000000000300000 x21: 006800000000070b
  couder kernel: x20: 0000000000300000 x19: 0000000010000000 x18: ffff8000849e00a8
  couder kernel: x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
  couder kernel: x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
  couder kernel: x11: 0000000000000000 x10: 0000000000000000 x9 : ffff80008003ca08
  couder kernel: x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
  couder kernel: x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
  couder kernel: x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000001
  couder kernel: Call trace:
  couder kernel:  ioremap_prot+0x84/0xa0
  couder kernel:  devm_ioremap_wc+0x80/0x130
  couder kernel:  simpledrm_device_create.constprop.0+0x814/0xaf0
  couder kernel:  simpledrm_probe+0x20/0xb8
  couder kernel:  platform_probe+0x74/0x118
  couder kernel:  really_probe+0xd8/0x3e8
  couder kernel:  __driver_probe_device+0x94/0x1c8
  couder kernel:  driver_probe_device+0x48/0x188
  couder kernel:  __device_attach_driver+0x114/0x220
  couder kernel:  bus_for_each_drv+0x94/0x118
  couder kernel:  __device_attach+0xac/0x208
  couder kernel:  device_initial_probe+0x20/0x48
  couder kernel:  bus_probe_device+0xcc/0xd8
  couder kernel:  device_add+0x538/0x738
  couder kernel:  platform_device_add+0x1e4/0x308
  couder kernel:  sysfb_create_simplefb+0x1ac/0x1c8
  couder kernel:  sysfb_init+0x1b0/0x200
  couder kernel:  do_one_initcall+0x64/0x388
  couder kernel:  do_initcalls+0x13c/0x2d8
  couder kernel:  kernel_init_freeable+0x134/0x2a8

  [1] http://test-results.kernel/2025.04.14/noble/linux-
  hwe-6.11/6.11.0-26.26~24.04.1/boot-generic-64k-testflinger-arm-
  server.arm64-ubuntu_boot-log.html#log_check-start

  [2] http://test-results.kernel/2025.04.14/noble/linux-lowlatency-
  hwe-6.11/6.11.0-1014.15~24.04.1/boot-lowlatency-64k-testflinger-arm-
  server.arm64-ubuntu_boot-log.html#log_check-start

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Follow ups

[Bug 2110469] Re: WARNING: CPU: 6 PID: 1 at arch/arm64/mm/ioremap.c:16 ioremap_prot+0x84/0xa0
From: Po-Hsu Lin, 2025-05-13
[Bug 2110469] Re: WARNING: CPU: 6 PID: 1 at arch/arm64/mm/ioremap.c:16 ioremap_prot+0x84/0xa0
From: Po-Hsu Lin, 2025-05-12