INFO: task syz-executor6:12280 blocked for more than 140 seconds. Not tainted 4.17.0+ #22 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D56688 12280 4594 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:00007f168f6b2c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f168f6b36d4 RCX: 0000000000455ba9 RDX: 0000000020000100 RSI: 0000000000000013 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0e17 R14: 00000000004d0f48 R15: 0000000000000000 NMI backtrace for cpu 0 CPU: 0 PID: 800 Comm: khungtaskd Not tainted 4.17.0+ #22 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 0 to CPUs 1: ------------[ cut here ]------------ kernel BUG at mm/kmsan/kmsan_entry.c:81! invalid opcode: 0000 [#1] SMP PTI Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.17.0+ #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kmsan_nmi_enter+0x42/0x70 mm/kmsan/kmsan_entry.c:80 RSP: 0018:fffffe0000049ea8 EFLAGS: 00010046 RAX: 0000000080000000 RBX: 0000000000000001 RCX: 00000000c0000101 RDX: 00000000ffff8802 RSI: ffffffff8a00136c RDI: ffffea0000421320 RBP: fffffe0000049ef9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 00000001b1546000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001b1546000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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_entry.c:80 RSP: fffffe0000049ea8 ---[ end trace af45a8597de88b99 ]---