KCSAN: data-race in acpi_ut_status_exit / acpi_ut_track_stack_ptr

Status: moderation: reported on 2026/07/25 13:57
Subsystems: acpica
Labels: race:benign
[Documentation on labels]
Reported-by: syzbot+db6b2fb85fc915861dee@syzkaller.appspotmail.com
First crash: 2h27m, last: 2h27m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
07939730 assessment-kcsan Benign: ✅ KCSAN: data-race in acpi_ut_status_exit / acpi_ut_track_stack_ptr 2026/07/25 13:56 2026/07/25 13:56 2026/07/25 14:25 492bab15

			
		

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

read to 0xffffffff89404508 of 4 bytes by task 2464 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

write to 0xffffffff89404508 of 4 bytes by task 8704 on cpu 1:
 acpi_ut_status_exit+0xfe/0x120 drivers/acpi/acpica/utdebug.c:472
 acpi_ns_get_node_unlocked+0x2a4/0x2d0 drivers/acpi/acpica/nsutils.c:-1
 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: 0x00000002 -> 0x00000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 8704 Comm: kworker/u8:16 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: async async_run_entry_fn
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/25 13:56 upstream e2a936998ab2 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_status_exit / acpi_ut_track_stack_ptr
* Struck through repros no longer work on HEAD.