KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr

Status: moderation: reported on 2026/08/01 07:10
Subsystems: acpica
Labels: race:benign prio:high
[Documentation on labels]
Reported-by: syzbot+5160a7a38c16bfa3a59a@syzkaller.appspotmail.com
First crash: 47d, last: 2h24m
✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
08a2fd29 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ✅ VMHostTrigger: ❌ KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr 2026/08/03 00:55 2026/08/03 00:55 2026/08/03 01:23 e611ffe1
ec8fdae8 assessment-kcsan Benign: ✅ KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr 2026/08/01 07:10 2026/08/01 07:10 2026/08/01 07:29 e611ffe1

Sample crash report:
sd 0:0:1:0: [sda] Synchronizing SCSI cache
==================================================================
BUG: KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr

read to 0xffffffff896238c8 of 4 bytes by task 16075 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:1091 [inline]
 pci_power_up+0x40/0x3b0 drivers/pci/pci.c:1339
 pci_pm_power_up_and_verify_state+0x29/0x130 drivers/pci/pci.c:3186
 pci_pm_default_resume_early drivers/pci/pci-driver.c:614 [inline]
 pci_pm_resume_noirq+0xcb/0x320 drivers/pci/pci-driver.c:1019
 dpm_run_callback+0x53/0x2f0 drivers/base/power/main.c:513
 device_resume_noirq+0x851/0x880 drivers/base/power/main.c:871
 async_resume_noirq+0x2c/0x40 drivers/base/power/main.c:893
 async_run_entry_fn+0x52/0x180 kernel/async.c:129
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x56a/0xa50 kernel/workqueue.c:3479
 worker_thread+0x569/0x750 kernel/workqueue.c:3560
 kthread+0x223/0x270 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 0xffffffff896238c8 of 4 bytes by task 16070 on cpu 1:
 acpi_ut_trace_ptr+0x49/0x180 drivers/acpi/acpica/utdebug.c:306
 acpi_ns_get_node_unlocked+0x61/0x2d0 drivers/acpi/acpica/nsutils.c:643
 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:1091 [inline]
 pci_power_up+0x40/0x3b0 drivers/pci/pci.c:1339
 pci_pm_power_up_and_verify_state+0x29/0x130 drivers/pci/pci.c:3186
 pci_pm_default_resume_early drivers/pci/pci-driver.c:614 [inline]
 pci_pm_resume_noirq+0xcb/0x320 drivers/pci/pci-driver.c:1019
 dpm_run_callback+0x53/0x2f0 drivers/base/power/main.c:513
 device_resume_noirq+0x851/0x880 drivers/base/power/main.c:871
 async_resume_noirq+0x2c/0x40 drivers/base/power/main.c:893
 async_run_entry_fn+0x52/0x180 kernel/async.c:129
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0x56a/0xa50 kernel/workqueue.c:3479
 worker_thread+0x569/0x750 kernel/workqueue.c:3560
 kthread+0x223/0x270 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: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 16070 Comm: kworker/u8:15 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
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/17 09:44 upstream 238650ef6c7c 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr
2026/09/15 07:38 upstream 587858367581 81a27d1a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr
2026/09/06 22:59 upstream 88405f0ad1d5 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr
2026/09/01 05:54 upstream bf1079577a11 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr
2026/08/01 07:10 upstream 0131b508c0e2 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_track_stack_ptr
* Struck through repros no longer work on HEAD.