BUG: unable to handle page fault for address: fffffc0000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 11676 Comm: syz-executor.3 Not tainted 5.4.0-rc5-next-20191029 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:92 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:109 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline]
RIP: 0010:check_memory_region+0x123/0x1a0 mm/kasan/generic.c:192
Code: 49 89 d9 49 29 c1 e9 68 ff ff ff 5b b8 01 00 00 00 41 5c 41 5d 5d c3 4d 85 c9 74 ef 4d 01 e1 eb 09 48 83 c0 01 4c 39 c8 74 e1 <80> 38 00 74 f2 eb 8c 4d 39 c2 74 4d e8 8c e4 ff ff 31 c0 5b 41 5c
RSP: 0018:ffff8880478d7d28 EFLAGS: 00010216
RAX: fffffc0000000000 RBX: dffffc0000000001 RCX: ffffffff81d256a8
RDX: 0000000000000001 RSI: 0000000000000008 RDI: fffffffffffffffc
RBP: ffff8880478d7d40 R08: 1fffffffffffffff R09: dffffc0000000001
R10: dffffc0000000000 R11: 0000000000000003 R12: fffffbffffffffff
R13: fffffffffffffff4 R14: ffff88808e603080 R15: ffff88808e603010
FS:  00000000029ad940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffc0000000000 CR3: 0000000071142000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __kasan_check_write+0x14/0x20 mm/kasan/common.c:98
 set_bit include/asm-generic/bitops-instrumented.h:28 [inline]
 io_wq_cancel_all+0x28/0x2a0 fs/io-wq.c:617
 io_ring_ctx_wait_and_kill+0x1e8/0x700 fs/io_uring.c:3877
 io_uring_release+0x42/0x50 fs/io_uring.c:3889
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413ae1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fff4f8a2ae0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413ae1
RDX: fffffffffffffff7 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000001 R08: 00000000ef8245d3 R09: 00000000ef8245d7
R10: 00007fff4f8a2bc0 R11: 0000000000000293 R12: 000000000075c9a0
R13: 000000000075c9a0 R14: 00000000007604b0 R15: 000000000075bf2c
Modules linked in:
CR2: fffffc0000000000
---[ end trace b34fe8605905fe8e ]---
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:92 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:109 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline]
RIP: 0010:check_memory_region+0x123/0x1a0 mm/kasan/generic.c:192
Code: 49 89 d9 49 29 c1 e9 68 ff ff ff 5b b8 01 00 00 00 41 5c 41 5d 5d c3 4d 85 c9 74 ef 4d 01 e1 eb 09 48 83 c0 01 4c 39 c8 74 e1 <80> 38 00 74 f2 eb 8c 4d 39 c2 74 4d e8 8c e4 ff ff 31 c0 5b 41 5c
RSP: 0018:ffff8880478d7d28 EFLAGS: 00010216
RAX: fffffc0000000000 RBX: dffffc0000000001 RCX: ffffffff81d256a8
RDX: 0000000000000001 RSI: 0000000000000008 RDI: fffffffffffffffc
RBP: ffff8880478d7d40 R08: 1fffffffffffffff R09: dffffc0000000001
R10: dffffc0000000000 R11: 0000000000000003 R12: fffffbffffffffff
R13: fffffffffffffff4 R14: ffff88808e603080 R15: ffff88808e603010
FS:  00000000029ad940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffc0000000000 CR3: 0000000071142000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400