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: 69d, last: 10d
▶ ▼ ✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision
53fc4af2 repro-c Reproduced: ✅ ❓ KCSAN: data-race in acpi_ut_trace / acpi_ut_track_stack_ptr 2026/09/25 07:43 2026/09/25 07:44 2026/09/25 08:28 f281d9d2
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
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/09/25 09:53 11m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f49a343b305c0b6c19a3b50c0bbf10bcd0e2e8fd report job log log

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

read to 0xffffffff896248c8 of 4 bytes by task 12 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 0xffffffff896248c8 of 4 bytes by task 8939 on cpu 1:
 acpi_ut_trace+0x44/0x180 drivers/acpi/acpica/utdebug.c:268
 acpi_ns_lookup+0x95/0x1070 drivers/acpi/acpica/nsaccess.c:303
 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: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: 0x00000002 -> 0x00000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 8939 Comm: kworker/u8:21 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 (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/21 16:04 upstream 93f51579e7df 853b104b .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
2026/09/20 10:52 upstream 518e5b794c06 853b104b .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
2026/09/19 17:25 upstream 40288c9206c1 853b104b .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
2026/09/15 17:04 upstream 587858367581 2daa4bb5 .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
2026/09/15 06:32 upstream 587858367581 81a27d1a .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
2026/09/14 13:00 upstream 704340f1cd0d 70a60e12 .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
2026/09/09 16:19 upstream 893e11787f78 8387c273 .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
2026/09/08 14:46 upstream 28924df2a08f 680aa3e1 .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
2026/09/01 13:39 upstream 786262be6048 587f6b29 .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
2026/09/01 05:46 upstream bf1079577a11 316d9396 .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
2026/08/27 15:42 upstream 73e3f0710014 69a01293 .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
2026/08/25 16:50 upstream 66498c75b4f8 a9a1fc32 .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
2026/08/09 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.