Messages in this thread | | | Date | Fri, 18 Aug 2023 10:10:30 +0200 | Subject | Re: [BUG] KCSAN: data-race in process_one_work / process_one_work | From | Mirsad Todorovac <> |
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On 8/17/23 23:59, Tejun Heo wrote: > On Thu, Aug 17, 2023 at 09:24:28PM +0200, Mirsad Todorovac wrote: >> Hi, >> >> This is your friendly bug reporter. >> >> The environment is vanilla torvalds tree kernel on Ubuntu 22.04 LTS and on a Ryzen 7950X >> assembled box. >> >> The kernel reports G taint "properietary module loaded", but I know of no module since >> the boot state when the status was "Not tainted". >> >> Please find the complete dmesg output (or what's left in the ring buffer) and lshw output >> attached. >> >> Here is the dmesg output excerpt: >> >> [ 6849.221584] ================================================================== >> [ 6849.221607] BUG: KCSAN: data-race in process_one_work / process_one_work >> >> [ 6849.221635] write to 0xffff9b7440151398 of 8 bytes by task 6364 on cpu 7: >> [ 6849.221647] process_one_work+0x504/0x930 >> [ 6849.221660] worker_thread+0x311/0x7e0 >> [ 6849.221673] kthread+0x18b/0x1d0 >> [ 6849.221683] ret_from_fork+0x43/0x70 >> [ 6849.221695] ret_from_fork_asm+0x1b/0x30 >> >> [ 6849.221712] read to 0xffff9b7440151398 of 8 bytes by task 5586 on cpu 28: >> [ 6849.221724] process_one_work+0x4e8/0x930 >> [ 6849.221737] worker_thread+0x519/0x7e0 >> [ 6849.221749] kthread+0x18b/0x1d0 >> [ 6849.221759] ret_from_fork+0x43/0x70 >> [ 6849.221770] ret_from_fork_asm+0x1b/0x30 >> >> [ 6849.221786] value changed: 0x00000000000154d0 -> 0x00000000000154d1 >> >> [ 6849.221802] Reported by Kernel Concurrency Sanitizer on: >> [ 6849.221811] CPU: 28 PID: 5586 Comm: kworker/u64:0 Tainted: G L 6.5.0-rc6-net-cfg-kcsan-00038-g16931859a650 #35 >> [ 6849.221825] Hardware name: ASRock X670E PG Lightning/X670E PG Lightning, BIOS 1.21 04/26/2023 >> [ 6849.221833] Workqueue: events_unbound wq_barrier_func >> [ 6849.221846] ================================================================== > > That looks like the PENDING bit. The setting is atomic. Maybe there's a raw > read? Can you map the addresses to lines? > > Thanks.
Good news:
[ 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);
Best regards, Mirsad Todorovac
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