================================================================== BUG: KCSAN: data-race in p9_poll_workfn / p9_write_work read to 0xffff888101f16e94 of 4 bytes by task 7553 on cpu 0: p9_poll_mux net/9p/trans_fd.c:637 [inline] p9_poll_workfn+0xb9/0x350 net/9p/trans_fd.c:1122 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 write to 0xffff888101f16e94 of 4 bytes by task 17 on cpu 1: p9_write_work+0x3ea/0x6d0 net/9p/trans_fd.c:465 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events p9_write_work ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events p9_write_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x11d/0x181 lib/dump_stack.c:118 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0xd kernel/kcsan/report.c:315 kcsan_setup_watchpoint+0x3fe/0x460 kernel/kcsan/core.c:423 check_access kernel/kcsan/core.c:466 [inline] __tsan_write4 kernel/kcsan/core.c:595 [inline] __tsan_unaligned_write4+0xc4/0x100 kernel/kcsan/core.c:595 p9_write_work+0x3ea/0x6d0 net/9p/trans_fd.c:465 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..