================================================================== BUG: KCSAN: data-race in p9_poll_workfn / p9_write_work write to 0xffff88811265d494 of 4 bytes by task 5 on cpu 0: 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 read to 0xffff88811265d494 of 4 bytes by task 17660 on cpu 1: 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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17660 Comm: kworker/1:14 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events p9_poll_workfn ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 17660 Comm: kworker/1:14 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events p9_poll_workfn Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xf5/0x159 lib/dump_stack.c:113 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0x10 kernel/kcsan/report.c:302 __kcsan_setup_watchpoint+0x32e/0x4a0 kernel/kcsan/core.c:411 __tsan_read4 kernel/kcsan/kcsan.c:35 [inline] __tsan_read4+0x2c/0x30 kernel/kcsan/kcsan.c:35 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 Kernel Offset: disabled Rebooting in 86400 seconds..