CVE-2023-53329: In the Linux kernel, the following vulnerability has been resolved:  workqueue: fix data race with the pwq->stats[] increment  KCSAN has discovered a data race in kernel/workqueue.c:2598:  [ 1863.554079] ================================================================== [ 1863.554118] BUG: KCSAN: data-race in process_one_work / process_one_work  [ 1863.554142] write to 0xffff963d99d79998 of 8 bytes by task 5394 on cpu 27: [ 1863.554154] process_one_work (kernel/workqueue.c:2598) [ 1863.554166] worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2752) [ 1863.554177] kthread (kernel/kthread.c:389) [ 1863.554186] ret_from_fork (arch/x86/kernel/process.c:145) [ 1863.554197] ret_from_fork_asm (arch/x86/entry/entry_64.S:312)  [ 1863.554213] read to 0xffff963d99d79998 of 8 bytes by task 5450 on cpu 12: [ 1863.554224] process_one_work (kernel/workqueue.c:2598) [ 1863.554235] worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2752) [ 1863.554247] kthread (kernel/kthread.c:389) [ 1863.554255] ret_from_fork (arch/x86/kernel/process.c:145) [ 1863.554266] ret_from_fork_asm (arch/x86/entry/entry_64.S:312)  [ 1863.554280] value changed: 0x0000000000001766 -> 0x000000000000176a  [ 1863.554295] Reported by Kernel Concurrency Sanitizer on: [ 1863.554303] CPU: 12 PID: 5450 Comm: kworker/u64:1 Tainted: G             L     6.5.0-rc6+ #44 [ 1863.554314] Hardware name: ASRock X670E PG Lightning/X670E PG Lightning, BIOS 1.21 04/26/2023 [ 1863.554322] Workqueue: btrfs-endio btrfs_end_bio_work [btrfs] [ 1863.554941] ==================================================================      lockdep_invariant_state(true); →   pwq->stats[PWQ_STAT_STARTED]++;     trace_workqueue_execute_start(work);     worker->current_func(work);  Moving pwq->stats[PWQ_STAT_STARTED]++; before the line      raw_spin_unlock_irq(&pool->lock);  resolves the data race without performance penalty.  KCSAN detected at least one additional data race:  [  157.834751] ================================================================== [  157.834770] BUG: KCSAN: data-race in process_one_work / process_one_work  [  157.834793] write to 0xffff9934453f77a0 of 8 bytes by task 468 on cpu 29: [  157.834804] process_one_work (/home/marvin/linux/kernel/linux_torvalds/kernel/workqueue.c:2606) [  157.834815] worker_thread (/home/marvin/linux/kernel/linux_torvalds/./include/linux/list.h:292 /home/marvin/linux/kernel/linux_torvalds/kernel/workqueue.c:2752) [  157.834826] kthread (/home/marvin/linux/kernel/linux_torvalds/kernel/kthread.c:389) [  157.834834] ret_from_fork (/home/marvin/linux/kernel/linux_torvalds/arch/x86/kernel/process.c:145) [  157.834845] ret_from_fork_asm (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:312)  [  157.834859] read to 0xffff9934453f77a0 of 8 bytes by task 214 on cpu 7: [  157.834868] process_one_work (/home/marvin/linux/kernel/linux_torvalds/kernel/workqueue.c:2606) [  157.834879] worker_thread (/home/marvin/linux/kernel/linux_torvalds/./include/linux/list.h:292 /home/marvin/linux/kernel/linux_torvalds/kernel/workqueue.c:2752) [  157.834890] kthread (/home/marvin/linux/kernel/linux_torvalds/kernel/kthread.c:389) [  157.834897] ret_from_fork (/home/marvin/linux/kernel/linux_torvalds/arch/x86/kernel/process.c:145) [  157.834907] ret_from_fork_asm (/home/marvin/linux/kernel/linux_torvalds/arch/x86/entry/entry_64.S:312)  [  157.834920] value changed: 0x000000000000052a -> 0x0000000000000532  [  157.834933] Reported by Kernel Concurrency Sanitizer on: [  157.834941] CPU: 7 PID: 214 Comm: kworker/u64:2 Tainted: G             L     6.5.0-rc7-kcsan-00169-g81eaf55a60fc #4 [  157.834951] Hardware name: ASRock X670E PG Lightning/X670E PG Lightning, BIOS 1.21 04/26/2023 [  157.834958] Workqueue: btrfs-endio btrfs_end_bio_work [btrfs] [  157.835567] ==================================================================  in code:          trace_workqueue_execute_end(work, worker->current_func); →       pwq->stats[PWQ_STAT_COM ---truncated---