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

read to 0xffff888122b6d090 of 8 bytes by task 1064 on cpu 0:
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2b1/0x960 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 0xffff888122b6d090 of 8 bytes by task 8001 on cpu 1:
 handle_mm_fault+0x4a/0x530 mm/memory.c:4089
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8001 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8001 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #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+0x11d/0x181 lib/dump_stack.c:118
 panic+0x210/0x640 kernel/panic.c:221
 kcsan_report.cold+0xc/0xd kernel/kcsan/report.c:313
 kcsan_setup_watchpoint+0x3fe/0x460 kernel/kcsan/core.c:416
 check_access kernel/kcsan/core.c:459 [inline]
 __tsan_unaligned_write8+0xc7/0x110 kernel/kcsan/core.c:589
 handle_mm_fault+0x4a/0x530 mm/memory.c:4089
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x40ad42
Code: 00 83 e1 0f bf 01 00 00 00 d3 e7 66 39 fa 73 8b 4d 85 d2 74 32 48 c1 e8 38 3c 04 73 03 83 c0 04 41 84 02 4d 89 c1 49 83 e0 07 <43> 88 04 02 4c 89 d0 4b 8d 4c 8a 08 8b 54 24 58 89 11 48 ff 03 49
RSP: 002b:000000c421c478d8 EFLAGS: 00010246
RAX: 00000000000000d1 RBX: 000000c435b40450 RCX: 000000000000000a
RDX: 0000000000000000 RSI: 0000000000866680 RDI: 0000000000000400
RBP: 000000c421c47910 R08: 0000000000000000 R09: 0000000000000000
R10: 000000c435b50d78 R11: 0000000000001a00 R12: 0000000000000600
R13: 0000000000000018 R14: 0000000000000057 R15: 0000000000000100
Kernel Offset: disabled
Rebooting in 86400 seconds..