==================================================================
BUG: KCSAN: data-race in handle_mm_fault / watchdog

read to 0xffff888120b970d0 of 8 bytes by task 1061 on cpu 1:
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2c3/0x7c0 kernel/hung_task.c:289
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff888120b970d0 of 8 bytes by task 22960 on cpu 0:
 handle_mm_fault+0x4a/0x530 mm/memory.c:3987
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22960 Comm: blkid Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 22960 Comm: blkid Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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/0xe kernel/kcsan/report.c:302
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:357
 check_access kernel/kcsan/core.c:409 [inline]
 __tsan_unaligned_write8+0x143/0x1f0 kernel/kcsan/core.c:530
 handle_mm_fault+0x4a/0x530 mm/memory.c:3987
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202
RIP: 0033:0x7f1d9789da3a
Code: 48 83 f8 ff 0f 84 5b 01 00 00 48 8b 15 6f 86 21 00 48 83 fa 10 0f 86 3d 01 00 00 48 8d 3d 73 18 01 00 b9 0b 00 00 00 48 89 c6 <f3> a6 0f 85 45 01 00 00 8b 48 0c 48 89 c5 48 89 05 31 86 21 00 48
RSP: 002b:00007ffe69864620 EFLAGS: 00010202
RAX: 00007f1d97aae000 RBX: 0000000000400f31 RCX: 000000000000000b
RDX: 00000000000033ef RSI: 00007f1d97aae000 RDI: 00007f1d978af2a5
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000217 R12: 00007f1d97ab61c8
R13: 00007f1d97ab5040 R14: 0000000000000000 R15: 00007f1d97ab6570
Kernel Offset: disabled
Rebooting in 86400 seconds..