INFO: task syz-executor.5:2104 blocked for more than 140 seconds. Not tainted 4.4.174+ #4 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D ffff8800a8a27668 25616 2104 1 0x00000004 ffff8800a8a27668 ffff8801d75b4740 5740c8c657b411f4 ffff8801d75b4740 0000000000000000 ffff8801d75b5000 ffff8801db61f180 ffff8801db61f1a8 ffff8801db61e898 ffff8801d4c517c0 ffff8801d75b4740 ffffed0015144001 Call Trace: [] schedule+0x99/0x1d0 kernel/sched/core.c:3355 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621 [] __blkdev_get+0x10c/0xdf0 fs/block_dev.c:1199 [] blkdev_get+0x2e8/0x920 fs/block_dev.c:1353 [] blkdev_open+0x1aa/0x250 fs/block_dev.c:1508 [] do_dentry_open+0x38f/0xbd0 fs/open.c:749 [] vfs_open+0x10b/0x210 fs/open.c:862 [] do_last fs/namei.c:3269 [inline] [] path_openat+0x136f/0x4470 fs/namei.c:3406 [] do_filp_open+0x1a1/0x270 fs/namei.c:3440 [] do_sys_open+0x2f8/0x600 fs/open.c:1038 [] SYSC_open fs/open.c:1056 [inline] [] SyS_open+0x2d/0x40 fs/open.c:1051 [] entry_SYSCALL_64_fastpath+0x1e/0x9a 1 lock held by syz-executor.5/2104: #0: (&bdev->bd_mutex){+.+.+.}, at: [] __blkdev_get+0x10c/0xdf0 fs/block_dev.c:1199 Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4 task: ffff8801da6f4740 task.stack: ffff8800001d0000 RIP: 0010:[] [] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800001d7c88 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300 RBP: ffff8800001d7cb8 R08: 0000000000000018 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcfc43afc8 CR3: 00000000b563a000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34 000000000001b6c0 0000000000000008 ffff8800001d7cd8 ffffffff81092bee 0000000000000008 ffffffff82924260 ffff8800001d7d30 ffffffff81ab8252 Call Trace: [] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85 [] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 [] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog.cold+0xd3/0xee kernel/hung_task.c:238 [] kthread+0x273/0x310 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537 Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1 NMI backtrace for cpu 1 CPU: 1 PID: 3686 Comm: syz-executor.3 Not tainted 4.4.174+ #4 task: ffff8800b7e2df00 task.stack: ffff8801c06d8000 RIP: 0010:[] [] __module_text_address+0xe0/0x140 kernel/module.c:4122 RSP: 0018:ffff8801c06df568 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8801c06df580 R08: ffff8801c06df6c0 R09: 0000000000000000 R10: ffff8801c06df698 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8801c06df6c0 R14: ffff8801c06dfff8 R15: ffff8801c06d8000 FS: 00007f16eb5e5700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000b14000 CR3: 00000000baa97000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 1ffff100380dbeb0 0000000000000000 0000000000000000 ffff8801c06df598 ffffffff812aef7b 0000000000000000 ffff8801c06df5b0 ffffffff8112f548 ffff8801c06df688 ffff8801c06df608 ffffffff81013549 0000000000000000 Call Trace: [] is_module_text_address+0x1b/0x50 kernel/module.c:4108 [] __kernel_text_address+0x68/0xa0 kernel/extable.c:103 [] print_context_stack+0x59/0xd0 arch/x86/kernel/dumpstack.c:107 [] dump_trace+0x179/0x390 arch/x86/kernel/dumpstack_64.c:243 [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack mm/kasan/kasan.c:512 [inline] [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616 [] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601 [] kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:554 [] slab_post_alloc_hook mm/slub.c:1349 [inline] [] slab_alloc_node mm/slub.c:2615 [inline] [] slab_alloc mm/slub.c:2623 [inline] [] __kmalloc+0xff/0x330 mm/slub.c:3609 [] kmalloc_array include/linux/slab.h:566 [inline] [] kcalloc include/linux/slab.h:577 [inline] [] iter_file_splice_write+0x15c/0xb30 fs/splice.c:967 [] do_splice_from fs/splice.c:1128 [inline] [] direct_splice_actor+0x126/0x1a0 fs/splice.c:1294 [] splice_direct_to_actor+0x2ce/0x850 fs/splice.c:1247 [] do_splice_direct+0x1a5/0x260 fs/splice.c:1337 [] do_sendfile+0x4ed/0xba0 fs/read_write.c:1229 [] SYSC_sendfile64 fs/read_write.c:1284 [inline] [] SyS_sendfile64+0xc3/0x150 fs/read_write.c:1276 [] entry_SYSCALL_64_fastpath+0x1e/0x9a Code: 00 44 8b a0 dc 01 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 11 00 75 49 48 8b 90 c8 01 00 00 48 39 da 76 0b <31> c0 48 83 c4 08 5b 41 5c 5d c3 4c 01 e2 48 39 d3 73 ed 48 83