INFO: task syz-executor3:14564 blocked for more than 140 seconds.
      Not tainted 4.17.0+ #20
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D55456 14564   4646 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2880 [inline]
 __schedule+0x651/0x770 kernel/sched/core.c:3524
 schedule+0x1cc/0x2f0 kernel/sched/core.c:3568
 blk_queue_enter+0x30a/0x970 block/blk-core.c:953
 generic_make_request+0x13b/0x18f0 block/blk-core.c:2395
 blk_queue_split+0x235d/0x2400 block/blk-merge.c:215
 blk_mq_make_request+0x273/0x2440 block/blk-mq.c:1861
 generic_make_request+0x733/0x18f0 block/blk-core.c:2460
 submit_bio+0x2e8/0x740 block/blk-core.c:2568
 mpage_bio_submit fs/mpage.c:66 [inline]
 mpage_readpages+0x8f3/0x9b0 fs/mpage.c:393
 blkdev_readpages+0x9b/0xb0 fs/block_dev.c:577
 read_pages mm/readahead.c:121 [inline]
 __do_page_cache_readahead+0x87a/0xf20 mm/readahead.c:202
 ondemand_readahead+0xc68/0x1210 mm/internal.h:66
 page_cache_async_readahead+0x34c/0x360 mm/readahead.c:557
 generic_file_buffered_read mm/filemap.c:2100 [inline]
 generic_file_read_iter+0xdfe/0x44d0 mm/filemap.c:2362
 blkdev_read_iter+0x20d/0x280 fs/block_dev.c:1930
 call_read_iter include/linux/fs.h:1778 [inline]
 generic_file_splice_read+0x5d7/0x900 fs/splice.c:307
 do_splice_to fs/splice.c:880 [inline]
 splice_direct_to_actor+0x4cb/0x1040 fs/splice.c:952
 do_splice_direct+0x335/0x540 fs/splice.c:1061
 do_sendfile+0x107b/0x1e40 fs/read_write.c:1440
 __do_sys_sendfile64 fs/read_write.c:1495 [inline]
 __se_sys_sendfile64 fs/read_write.c:1487 [inline]
 __x64_sys_sendfile64+0x218/0x390 fs/read_write.c:1487
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ba9
RSP: 002b:00007f3e0ad7ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f3e0ad7f6d4 RCX: 0000000000455ba9
RDX: 0000000020000000 RSI: 0000000000000013 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002000005 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c0db1 R14: 00000000004d0e48 R15: 0000000000000000
NMI backtrace for cpu 1
CPU: 1 PID: 805 Comm: khungtaskd Not tainted 4.17.0+ #20
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+0x185/0x1d0 lib/dump_stack.c:113
 nmi_cpu_backtrace lib/nmi_backtrace.c:103 [inline]
 nmi_trigger_cpumask_backtrace+0x262/0x4c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x2c/0x40 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace+0x2b/0x30 include/linux/nmi.h:138
 check_hung_task kernel/hung_task.c:132 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
 watchdog+0x10d5/0x1100 kernel/hung_task.c:249
 kthread+0x4db/0x6c0 kernel/kthread.c:241
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
------------[ cut here ]------------
kernel BUG at mm/kmsan/kmsan.c:1998!
invalid opcode: 0000 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kmsan_nmi_enter+0x42/0x70 mm/kmsan/kmsan.c:1997
RSP: 0018:fffffe000000eea8 EFLAGS: 00010046
RAX: 0000000080000200 RBX: 0000000000000001 RCX: 00000000c0000101
RDX: 00000000ffff8802 RSI: ffffffff8a00136c RDI: ffffea0000443b20
RBP: fffffe000000eef9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000191fce000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000191fce000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 </IRQ>
Code: 10 00 74 27 65 8b 04 25 40 90 03 00 83 c0 01 83 f8 08 7d 27 65 89 04 25 40 90 03 00 65 c6 04 25 d5 6d 0b 00 ff c3 0f 0b 90 eb fe <0f> 0b 66 90 66 2e 0f 1f 84 00 00 00 00 00 eb fe 0f 0b 66 90 66 
RIP: kmsan_nmi_enter+0x42/0x70 mm/kmsan/kmsan.c:1997 RSP: fffffe000000eea8
---[ end trace 23f81b73bb3a3f91 ]---