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

read to 0xffff888121895010 of 8 bytes by task 1069 on cpu 0:
 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 0xffff888121895010 of 8 bytes by task 3301 on cpu 1:
 handle_mm_fault+0x4a/0x530 mm/memory.c:3987
 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:1202

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3301 Comm: blkid Not tainted 5.4.0-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: 3301 Comm: blkid Not tainted 5.4.0-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:315
 kcsan_setup_watchpoint+0x3fe/0x460 kernel/kcsan/core.c:423
 check_access kernel/kcsan/core.c:466 [inline]
 __tsan_write8 kernel/kcsan/core.c:596 [inline]
 __tsan_unaligned_write8+0xc4/0x100 kernel/kcsan/core.c:596
 handle_mm_fault+0x4a/0x530 mm/memory.c:3987
 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:1202
RIP: 0033:0x7fd52ef83d61
Code: 00 c3 f7 05 9d c4 30 00 04 00 00 00 74 07 48 8d 05 84 95 0b 00 c3 0f 1f 00 48 31 c0 89 f9 83 e1 3f 66 0f ef c0 83 f9 30 77 19 <f3> 0f 6f 0f 66 0f 74 c1 66 0f d7 d0 85 d2 75 7a 48 89 f8 48 83 e0
RSP: 002b:00007ffde2e9c198 EFLAGS: 00010287
RAX: 0000000000000000 RBX: 00007fd52f4b787c RCX: 0000000000000020
RDX: 0000000000000005 RSI: 00007ffde2e9c988 RDI: 00007fd52f2aca20
RBP: 00007ffde2e9df2a R08: 0000000000000008 R09: 0101010101010101
R10: 0000000000000000 R11: 00007fd52ef3a060 R12: 0000000000403738
R13: 0000000000000001 R14: 0000000000000000 R15: 00007fd52f2aca20
Kernel Offset: disabled
Rebooting in 86400 seconds..