hfs: can't find a HFS filesystem on dev loop4 INFO: task jbd2/sda1-8:2172 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. jbd2/sda1-8 D17400 2172 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 io_schedule+0x1c/0x70 kernel/sched/core.c:5138 bit_wait_io+0x18/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xb3/0x130 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0x213/0x3c0 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x76/0x90 fs/buffer.c:119 wait_on_buffer include/linux/buffer_head.h:354 [inline] journal_wait_on_commit_record fs/jbd2/commit.c:175 [inline] jbd2_journal_commit_transaction+0x657b/0x8c54 fs/jbd2/commit.c:866 kjournald2+0x274/0xb50 fs/jbd2/journal.c:229 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 INFO: task syz-executor2:20298 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D22952 20298 4495 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 jbd2_log_wait_commit+0x329/0x4b0 fs/jbd2/journal.c:726 jbd2_complete_transaction+0x188/0x1f0 fs/jbd2/journal.c:781 ext4_fallocate+0xb14/0x2330 fs/ext4/extents.c:4984 vfs_fallocate+0x4b4/0x940 fs/open.c:308 ksys_fallocate+0x56/0x90 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:337 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f309697cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f309697d6d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005c0d R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cb608 R14: 00000000004c32b4 R15: 0000000000000000 INFO: task syz-executor2:20304 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D21592 20304 4495 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:765 [inline] ext4_file_write_iter+0x30b/0x1450 fs/ext4/file.c:235 call_write_iter include/linux/fs.h:1839 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_iter_write+0x77/0xb0 fs/read_write.c:972 iter_file_splice_write+0x8e7/0x1010 fs/splice.c:750 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1019 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/0xe20 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1501 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x1fd/0x250 fs/read_write.c:1487 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f309695bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f309695c6d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3840 R14: 00000000004c85ae R15: 0000000000000001 INFO: task syz-executor2:20306 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D24824 20306 4495 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:765 [inline] ext4_punch_hole+0x1de/0x1220 fs/ext4/inode.c:4265 ext4_fallocate+0x4cb/0x2330 fs/ext4/extents.c:4934 vfs_fallocate+0x4b4/0x940 fs/open.c:308 madvise_remove mm/madvise.c:610 [inline] madvise_vma mm/madvise.c:693 [inline] __do_sys_madvise mm/madvise.c:873 [inline] __se_sys_madvise mm/madvise.c:801 [inline] __x64_sys_madvise+0x5bf/0x16d0 mm/madvise.c:801 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f309693ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f309693b6d4 RCX: 0000000000457089 RDX: 0000000000000009 RSI: 0000000000004000 RDI: 0000000020003000 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d20d0 R14: 00000000004c7935 R15: 0000000000000002 INFO: task syz-executor2:20309 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D24632 20309 4495 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:765 [inline] do_truncate+0x19f/0x2b0 fs/open.c:61 handle_truncate fs/namei.c:3008 [inline] do_last fs/namei.c:3424 [inline] path_openat+0x33e2/0x5300 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x584/0x720 fs/open.c:1063 ksys_open include/linux/syscalls.h:1289 [inline] __do_sys_creat fs/open.c:1121 [inline] __se_sys_creat fs/open.c:1119 [inline] __x64_sys_creat+0x61/0x80 fs/open.c:1119 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f3096919c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f309691a6d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000700 RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cb428 R14: 00000000004c31db R15: 0000000000000003 INFO: task syz-executor2:20310 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D23960 20310 4495 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:765 [inline] ext4_file_write_iter+0x30b/0x1450 fs/ext4/file.c:235 call_write_iter include/linux/fs.h:1839 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_iter_write+0x77/0xb0 fs/read_write.c:972 iter_file_splice_write+0x8e7/0x1010 fs/splice.c:750 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1019 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/0xe20 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1501 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x1fd/0x250 fs/read_write.c:1487 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f30968f8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f30968f96d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 0000000000930320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3840 R14: 00000000004c85ae R15: 0000000000000004 INFO: task syz-executor2:20311 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D25408 20311 4495 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:765 [inline] ext4_fallocate+0x8de/0x2330 fs/ext4/extents.c:4957 vfs_fallocate+0x4b4/0x940 fs/open.c:308 ksys_fallocate+0x56/0x90 fs/open.c:331 __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0x97/0xf0 fs/open.c:337 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f30968d7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f30968d86d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00000000009303c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005c0d R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cb608 R14: 00000000004c32b4 R15: 0000000000000005 INFO: task syz-executor2:20312 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D25416 20312 4495 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:765 [inline] ext4_punch_hole+0x1de/0x1220 fs/ext4/inode.c:4265 ext4_fallocate+0x4cb/0x2330 fs/ext4/extents.c:4934 vfs_fallocate+0x4b4/0x940 fs/open.c:308 madvise_remove mm/madvise.c:610 [inline] madvise_vma mm/madvise.c:693 [inline] __do_sys_madvise mm/madvise.c:873 [inline] __se_sys_madvise mm/madvise.c:801 [inline] __x64_sys_madvise+0x5bf/0x16d0 mm/madvise.c:801 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f30968b6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f30968b76d4 RCX: 0000000000457089 RDX: 0000000000000009 RSI: 0000000000004000 RDI: 0000000020003000 RBP: 0000000000930460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d20d0 R14: 00000000004c7935 R15: 0000000000000006 INFO: task syz-executor4:20297 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180810+ #36 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D22216 20297 4494 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1780 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x430/0x8d0 kernel/sched/completion.c:136 flush_work+0x531/0x900 kernel/workqueue.c:2918 lru_add_drain_all+0x414/0x5c0 mm/swap.c:702 invalidate_bdev+0x9e/0xe0 fs/block_dev.c:97 loop_clr_fd+0x4bf/0xd60 drivers/block/loop.c:1081 lo_ioctl+0x875/0x1d70 drivers/block/loop.c:1416 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x9cd/0x2030 block/ioctl.c:601 block_ioctl+0xee/0x130 fs/block_dev.c:1883 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456ef7 Code: 48 8d 05 a7 ed 46 00 48 89 04 24 48 c7 44 24 08 1c 00 00 00 e8 ea 49 fd ff 0f 0b e8 63 30 00 00 eb c1 cc 64 48 8b 0c 25 f8 ff ff 48 3b 61 10 0f 86 bd 02 00 00 48 83 ec 58 48 89 6c 24 50 48 RSP: 002b:00007f34745daa88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f34745dab30 RCX: 0000000000456ef7 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000004 RBP: 0000000020003e00 R08: 00007f34745dab30 R09: 00007f34745daad0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000004c9a81 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/773: #0: 0000000076fc904c (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4348: 2 locks held by getty/4438: #0: 00000000600073e1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000af86f636 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4439: #0: 00000000f3b4afc3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000076754f1d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4440: #0: 000000001913ee14 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000001491d218 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4441: #0: 000000009330fc86 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000437288f8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4442: #0: 00000000c193c8ea (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000002a8d065e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4443: #0: 0000000015bed517 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000eae57f77 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4444: #0: 0000000045b722b1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000001c72b657 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor3/20280: 2 locks held by syz-executor2/20298: #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2799 [inline] #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: vfs_fallocate+0x72a/0x940 fs/open.c:307 #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: inode_lock include/linux/fs.h:765 [inline] #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: ext4_fallocate+0x8de/0x2330 fs/ext4/extents.c:4957 2 locks held by syz-executor2/20304: #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2799 [inline] #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: do_sendfile+0xac0/0xe20 fs/read_write.c:1439 #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: inode_lock include/linux/fs.h:765 [inline] #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: ext4_file_write_iter+0x30b/0x1450 fs/ext4/file.c:235 2 locks held by syz-executor2/20306: #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2799 [inline] #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: vfs_fallocate+0x72a/0x940 fs/open.c:307 #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: inode_lock include/linux/fs.h:765 [inline] #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: ext4_punch_hole+0x1de/0x1220 fs/ext4/inode.c:4265 2 locks held by syz-executor2/20309: #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: sb_start_write include/linux/fs.h:1598 [inline] #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: inode_lock include/linux/fs.h:765 [inline] #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: do_truncate+0x19f/0x2b0 fs/open.c:61 2 locks held by syz-executor2/20310: #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2799 [inline] #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: do_sendfile+0xac0/0xe20 fs/read_write.c:1439 #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: inode_lock include/linux/fs.h:765 [inline] #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: ext4_file_write_iter+0x30b/0x1450 fs/ext4/file.c:235 2 locks held by syz-executor2/20311: #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2799 [inline] #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: vfs_fallocate+0x72a/0x940 fs/open.c:307 #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: inode_lock include/linux/fs.h:765 [inline] #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: ext4_fallocate+0x8de/0x2330 fs/ext4/extents.c:4957 2 locks held by syz-executor2/20312: #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2799 [inline] #0: 00000000b4041ee3 (sb_writers#6){.+.+}, at: vfs_fallocate+0x72a/0x940 fs/open.c:307 #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: inode_lock include/linux/fs.h:765 [inline] #1: 00000000b010ccb0 (&sb->s_type->i_mutex_key#12){++++}, at: ext4_punch_hole+0x1de/0x1220 fs/ext4/inode.c:4265 2 locks held by syz-executor4/20297: #0: 000000007d34755d (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8e/0x1d70 drivers/block/loop.c:1403 #1: 0000000064dc8573 (lock#6){+.+.}, at: lru_add_drain_all+0xac/0x5c0 mm/swap.c:684 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 773 Comm: khungtaskd Not tainted 4.18.0-rc8-next-20180810+ #36 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+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb39/0x10b0 kernel/hung_task.c:265 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 20280 Comm: syz-executor3 Not tainted 4.18.0-rc8-next-20180810+ #36 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vmx_vcpu_run+0x1244/0x2600 arch/x86/kvm/vmx.c:10421 Code: 60 03 00 00 4c 8b a9 68 03 00 00 4c 8b b1 70 03 00 00 4c 8b b9 78 03 00 00 48 8b 89 08 03 00 00 75 05 0f 01 c2 eb 03 0f 01 c3 <48> 89 4c 24 08 59 0f 96 81 08 57 00 00 48 89 81 00 03 00 00 48 89 RSP: 0018:ffff880198617350 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fb0cea10700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001c71a1000 CR4: 00000000001426f0 Call Trace: