KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr

Status: moderation: reported on 2026/07/25 04:27
Subsystems: acpica
Labels: race:benign prio:low
[Documentation on labels]
Reported-by: syzbot+b60b9dcd3441fc7ac4e2@syzkaller.appspotmail.com
First crash: 23d, last: 8d20h
✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
b5a6505f assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr 2026/07/27 00:00 2026/07/27 00:00 2026/07/27 00:02 492bab15
d10e06dd assessment-kcsan Benign: ✅ KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr 2026/07/25 04:26 2026/07/25 04:26 2026/07/25 04:54 1bdb5c57

Sample crash report:
==================================================================
BUG: KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr

read to 0xffffffff89409638 of 4 bytes by task 10018 on cpu 0:
 acpi_ut_track_stack_ptr+0x5f/0xd0 drivers/acpi/acpica/utdebug.c:73
 acpi_get_handle+0x40/0x180 drivers/acpi/acpica/nsxfname.c:53
 acpi_has_method+0x46/0x80 drivers/acpi/utils.c:672
 acpi_pci_set_power_state+0x5d/0x190 drivers/pci/pci-acpi.c:1084
 platform_pci_set_power_state drivers/pci/pci.c:1068 [inline]
 pci_power_up+0x40/0x3b0 drivers/pci/pci.c:1306
 pci_pm_power_up_and_verify_state+0x29/0x130 drivers/pci/pci.c:3153
 pci_pm_default_resume_early drivers/pci/pci-driver.c:591 [inline]
 pci_pm_resume_noirq+0xcb/0x320 drivers/pci/pci-driver.c:996
 dpm_run_callback+0x53/0x2f0 drivers/base/power/main.c:510
 device_resume_noirq+0x851/0x880 drivers/base/power/main.c:857
 async_resume_noirq+0x2c/0x40 drivers/base/power/main.c:879
 async_run_entry_fn+0x52/0x180 kernel/async.c:129
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
 worker_thread+0x569/0x750 kernel/workqueue.c:3486
 kthread+0x221/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read-write to 0xffffffff89409638 of 4 bytes by task 10517 on cpu 1:
 acpi_ut_trace+0x44/0x180 drivers/acpi/acpica/utdebug.c:268
 acpi_ns_search_and_enter+0x69/0x860 drivers/acpi/acpica/nssearch.c:261
 acpi_ns_lookup+0xbd8/0x1070 drivers/acpi/acpica/nsaccess.c:589
 acpi_ns_get_node_unlocked+0x143/0x2d0 drivers/acpi/acpica/nsutils.c:677
 acpi_ns_get_node+0x76/0xc0 drivers/acpi/acpica/nsutils.c:726
 acpi_get_handle+0xfd/0x180 drivers/acpi/acpica/nsxfname.c:98
 acpi_has_method+0x46/0x80 drivers/acpi/utils.c:672
 acpi_pci_set_power_state+0x5d/0x190 drivers/pci/pci-acpi.c:1084
 platform_pci_set_power_state drivers/pci/pci.c:1068 [inline]
 pci_power_up+0x40/0x3b0 drivers/pci/pci.c:1306
 pci_pm_power_up_and_verify_state+0x29/0x130 drivers/pci/pci.c:3153
 pci_pm_default_resume_early drivers/pci/pci-driver.c:591 [inline]
 pci_pm_resume_noirq+0xcb/0x320 drivers/pci/pci-driver.c:996
 dpm_run_callback+0x53/0x2f0 drivers/base/power/main.c:510
 device_resume_noirq+0x851/0x880 drivers/base/power/main.c:857
 async_resume_noirq+0x2c/0x40 drivers/base/power/main.c:879
 async_run_entry_fn+0x52/0x180 kernel/async.c:129
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0x4d4/0x9a0 kernel/workqueue.c:3405
 worker_thread+0x569/0x750 kernel/workqueue.c:3486
 kthread+0x221/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000003 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 10517 Comm: kworker/u8:20 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: async async_run_entry_fn
==================================================================
virtio_scsi virtio0: 1/0/0 default/read/poll queues

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/09 08:03 upstream 06cf61899d64 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
2026/08/04 21:25 upstream 562bfb501c54 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
2026/08/04 14:53 upstream 848acc8ffe1b d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
2026/08/01 13:10 upstream 0131b508c0e2 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
2026/07/31 04:46 upstream 3708dd948844 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
2026/07/26 12:36 upstream 3dab139d4795 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
2026/07/26 06:11 upstream 0ce37745d4bf 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
2026/07/25 04:26 upstream e2a936998ab2 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr
* Struck through repros no longer work on HEAD.