[moderation] [acpica?] KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_trace_ptr

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 15ef2f78c49d Merge tag 'input-for-v7.2-rc7' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16e6c279580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e71a508528491732
dashboard link: https://syzkaller.appspot.com/bug?extid=5052b8f9ee4c3426b1b6
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
CC: [acpica...@lists.linux.dev le...@kernel.org linux...@vger.kernel.org linux-...@vger.kernel.org raf...@kernel.org robert...@intel.com saket....@intel.com]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/507d1ac92b93/disk-15ef2f78.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5bce3a3a0eed/vmlinux-15ef2f78.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a62364f8fecd/bzImage-15ef2f78.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5052b8...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in acpi_ut_trace_ptr / acpi_ut_trace_ptr

read-write to 0xffffffff89410638 of 4 bytes by task 30 on cpu 1:
acpi_ut_trace_ptr+0x49/0x180 drivers/acpi/acpica/utdebug.c:306
acpi_ns_handle_to_pathname+0x3b/0x1d0 drivers/acpi/acpica/nsnames.c:138
acpi_rs_create_pci_routing_table+0x41a/0x760 drivers/acpi/acpica/rscreate.c:314
acpi_rs_get_prt_method_data+0xa3/0x100 drivers/acpi/acpica/rsutils.c:456
acpi_get_irq_routing_table+0x98/0xe0 drivers/acpi/acpica/rsxface.c:137
acpi_pci_irq_find_prt_entry+0xb3/0x6e0 drivers/acpi/pci_irq.c:215
acpi_pci_irq_lookup+0x3e/0x330 drivers/acpi/pci_irq.c:299
acpi_pci_irq_enable+0x13a/0x3d0 drivers/acpi/pci_irq.c:414
pcibios_enable_device+0x88/0xa0 arch/x86/pci/common.c:699
do_pci_enable_device+0x152/0x2d0 drivers/pci/pci.c:1998
pci_enable_device_flags+0x348/0x3a0 drivers/pci/pci.c:2089
pci_enable_device+0x1a/0xa0 drivers/pci/pci.c:2122
i801_probe+0x288/0xbf0 drivers/i2c/busses/i2c-i801.c:1573
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x28b/0x510 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x1ba/0x600 drivers/base/dd.c:706
__driver_probe_device+0x14f/0x1c0 drivers/base/dd.c:868
driver_probe_device+0x37/0x2f0 drivers/base/dd.c:898
__driver_attach_async_helper+0xb6/0x130 drivers/base/dd.c:1224
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 0xffffffff89410638 of 4 bytes by task 49 on cpu 0:
acpi_ut_trace_ptr+0x49/0x180 drivers/acpi/acpica/utdebug.c:306
acpi_ns_build_normalized_path+0x43/0x420 drivers/acpi/acpica/nsnames.c:202
acpi_ns_get_pathname_length+0x3f/0x70 drivers/acpi/acpica/nsnames.c:65
acpi_rs_get_pci_routing_table_length+0x1f2/0x2b0 drivers/acpi/acpica/rscalc.c:817
acpi_rs_create_pci_routing_table+0x79/0x760 drivers/acpi/acpica/rscreate.c:201
acpi_rs_get_prt_method_data+0xa3/0x100 drivers/acpi/acpica/rsutils.c:456
acpi_get_irq_routing_table+0x98/0xe0 drivers/acpi/acpica/rsxface.c:137
acpi_pci_irq_find_prt_entry+0xb3/0x6e0 drivers/acpi/pci_irq.c:215
acpi_pci_irq_lookup+0x3e/0x330 drivers/acpi/pci_irq.c:299
acpi_pci_irq_enable+0x13a/0x3d0 drivers/acpi/pci_irq.c:414
pcibios_enable_device+0x88/0xa0 arch/x86/pci/common.c:699
do_pci_enable_device+0x152/0x2d0 drivers/pci/pci.c:1998
pci_enable_device_flags+0x348/0x3a0 drivers/pci/pci.c:2089
pci_enable_device+0x1a/0xa0 drivers/pci/pci.c:2122
i801_probe+0x288/0xbf0 drivers/i2c/busses/i2c-i801.c:1573
local_pci_probe drivers/pci/pci-driver.c:332 [inline]
pci_call_probe drivers/pci/pci-driver.c:394 [inline]
__pci_device_probe drivers/pci/pci-driver.c:455 [inline]
pci_device_probe+0x28b/0x510 drivers/pci/pci-driver.c:489
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x1ba/0x600 drivers/base/dd.c:706
__driver_probe_device+0x14f/0x1c0 drivers/base/dd.c:868
driver_probe_device+0x37/0x2f0 drivers/base/dd.c:898
__driver_attach_async_helper+0xb6/0x130 drivers/base/dd.c:1224
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: 0x0000000c -> 0x0000000e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 49 Comm: kworker/u8:3 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
==================================================================
ACPI: \_SB_.LNKA: Enabled at IRQ 11
i801_smbus 0000:00:05.0: SMBus base address uninitialized, upgrade BIOS


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