syz-executor0(7426): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(7426): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(7426): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(7426): getblk(): executed=9 bh_count=0 bh_state=0 syz-executor0(7426): getblk(): executed=9 bh_count=0 bh_state=0 INFO: task syz-executor0:7425 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D23624 7425 8080 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 blkdev_put+0x34/0x540 fs/block_dev.c:1842 blkdev_close+0x8b/0xb0 fs/block_dev.c:1891 __fput+0x3bc/0xa90 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411471 Code: 89 ea 48 8b 7b 08 4c 89 e9 89 c6 41 ff d4 85 c0 89 c5 0f 85 0d ff ff ff e9 e0 fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 <89> 5c 24 e8 48 89 6c 24 f0 48 89 fb 4c 89 64 24 f8 48 83 ec 68 8b RSP: 002b:00007fffc92503b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000411471 RDX: 0000000000000000 RSI: 00000000007411d0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00000000007411c8 R09: 0000000000000000 R10: 00007fffc92502d0 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 00000000000007bb R15: 0000000000000000 INFO: task syz-executor0:7446 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D24240 7446 8080 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643 blkdev_open+0x1fb/0x280 fs/block_dev.c:1801 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x780 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4115f1 Code: 2e 0f 1f 84 00 00 00 00 00 41 57 49 89 ff 41 56 41 55 49 89 d5 41 54 55 53 48 81 ec 28 04 00 00 8b 4f 64 64 48 8b 04 25 28 00 <00> 00 48 89 84 24 18 04 00 00 31 c0 48 89 34 24 85 c9 74 18 8b 47 RSP: 002b:00007f2e54455a80 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000020000168 RCX: 00000000004115f1 RDX: 00007f2e54455afa RSI: 0000000000000002 RDI: 00007f2e54455af0 RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000008 R13: 0000000000000001 R14: 00000000004dae30 R15: 00000000ffffffff INFO: task syz-executor1:7436 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D22288 7436 8091 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 __get_super.part.11+0x207/0x2e0 fs/super.c:789 __get_super include/linux/spinlock.h:329 [inline] get_super+0x2d/0x50 fs/super.c:818 fsync_bdev+0x17/0xc0 fs/block_dev.c:495 invalidate_partition+0x35/0x60 block/genhd.c:1579 drop_partitions.isra.14+0xe1/0x200 block/partition-generic.c:443 rescan_partitions+0x72/0x8e0 block/partition-generic.c:516 __blkdev_reread_part+0x1ad/0x230 block/ioctl.c:173 blkdev_reread_part+0x26/0x40 block/ioctl.c:193 loop_reread_partitions+0x1c/0x40 drivers/block/loop.c:633 loop_set_status+0xcd8/0x10e0 drivers/block/loop.c:1268 loop_set_status64+0xaa/0x100 drivers/block/loop.c:1388 lo_ioctl+0x904/0x22a0 drivers/block/loop.c:1514 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0xd84/0x21b0 block/ioctl.c:605 block_ioctl+0xee/0x130 fs/block_dev.c:1909 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4579b9 Code: Bad RIP value. RSP: 002b:00007f234d575c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9 RDX: 0000000020000380 RSI: 0000000000004c04 RDI: 000000000000000a RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f234d5766d4 R13: 00000000004c0ed1 R14: 00000000004d27d8 R15: 00000000ffffffff INFO: task syz-executor1:7472 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D23272 7472 8091 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 syz-executor0(7426): getblk(): executed=9 bh_count=0 bh_state=0 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643 blkdev_open+0x1fb/0x280 fs/block_dev.c:1801 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x780 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4115f1 Code: 2e 0f 1f 84 00 00 00 00 00 41 57 49 89 ff 41 56 41 55 49 89 d5 41 54 55 53 48 81 ec 28 04 00 00 8b 4f 64 64 48 8b 04 25 28 00 <00> 00 48 89 84 24 18 04 00 00 31 c0 48 89 34 24 85 c9 74 18 8b 47 RSP: 002b:00007f234d5547a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004115f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f234d554850 RBP: 000000000073bfa0 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f234d5556d4 R13: 00000000004c61c1 R14: 00000000004dafe0 R15: 00000000ffffffff INFO: task blkid:7434 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D19304 7434 3941 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 blkdev_put+0x34/0x540 fs/block_dev.c:1842 blkdev_close+0x8b/0xb0 fs/block_dev.c:1891 __fput+0x3bc/0xa90 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fdc1b33e2b0 Code: Bad RIP value. RSP: 002b:00007ffd6f5b07d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fdc1b33e2b0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000028 R09: 0000000001680000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000f64030 R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000005 INFO: task syz-executor3:7444 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D23272 7444 8119 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643 blkdev_open+0x1fb/0x280 fs/block_dev.c:1801 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x780 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4115f1 Code: 2e 0f 1f 84 00 00 00 00 00 41 57 49 89 ff 41 56 41 55 49 89 d5 41 54 55 53 48 81 ec 28 04 00 00 8b 4f 64 64 48 8b 04 25 28 00 <00> 00 48 89 84 24 18 04 00 00 31 c0 48 89 34 24 85 c9 74 18 8b 47 RSP: 002b:00007fd3039f27a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004115f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fd3039f2850 RBP: 000000000073bf00 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd3039f36d4 R13: 00000000004c61c1 R14: 00000000004dafe0 R15: 00000000ffffffff INFO: task syz-executor3:7447 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D23272 7447 8119 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643 blkdev_open+0x1fb/0x280 fs/block_dev.c:1801 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x780 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4115f1 Code: 2e 0f 1f 84 00 00 00 00 00 41 57 49 89 ff 41 56 41 55 49 89 d5 41 54 55 53 48 81 ec 28 04 00 00 8b 4f 64 64 48 8b 04 25 28 00 <00> 00 48 89 84 24 18 04 00 00 31 c0 48 89 34 24 85 c9 74 18 8b 47 RSP: 002b:00007fd3039d17a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004115f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fd3039d1850 RBP: 000000000073bfa0 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd3039d26d4 R13: 00000000004c61c1 R14: 00000000004dafe0 R15: 00000000ffffffff INFO: task syz-executor4:7440 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D23576 7440 8138 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 blkdev_put+0x34/0x540 fs/block_dev.c:1842 blkdev_close+0x8b/0xb0 fs/block_dev.c:1891 __fput+0x3bc/0xa90 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411471 Code: 89 ea 48 8b 7b 08 4c 89 e9 89 c6 41 ff d4 85 c0 89 c5 0f 85 0d ff ff ff e9 e0 fe ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 <89> 5c 24 e8 48 89 6c 24 f0 48 89 fb 4c 89 64 24 f8 48 83 ec 68 8b syz-executor0(7426): getblk(): executed=9 bh_count=0 bh_state=0 RSP: 002b:00007ffc9082cbd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000411471 RDX: 0000000000000000 RSI: 00000000007406c8 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00000000007406c0 R09: 0000000000000000 R10: 00007ffc9082caf0 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 000000000000095d R15: 0000000000000004 INFO: task syz-executor4:7442 blocked for more than 140 seconds. Not tainted 4.20.0-rc7-next-20181224 #189 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D23640 7442 8138 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x9de/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643 blkdev_open+0x1fb/0x280 fs/block_dev.c:1801 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x780 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4115f1 Code: 2e 0f 1f 84 00 00 00 00 00 41 57 49 89 ff 41 56 41 55 49 89 d5 41 54 55 53 48 81 ec 28 04 00 00 8b 4f 64 64 48 8b 04 25 28 00 <00> 00 48 89 84 24 18 04 00 00 31 c0 48 89 34 24 85 c9 74 18 8b 47 RSP: 002b:00007efea1cb77a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004115f1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007efea1cb7850 RBP: 000000000073bf00 R08: 000000000000000f R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007efea1cb86d4 R13: 00000000004c61c1 R14: 00000000004dafe0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1034: #0: 000000009ac38165 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7935: #0: 0000000040652337 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:795 2 locks held by getty/8046: #0: 00000000f8269b7c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ec0a5aed (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8047: #0: 0000000002500712 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f709f379 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8048: #0: 000000007beeb0b1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000069f979bc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8049: #0: 000000003e9362e8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ab0adeea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8050: #0: 000000003c70c7d0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000008e41ba1c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8051: #0: 000000009f77c03f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000080897d56 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8052: #0: 0000000024453fc6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000675bf441 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 1 lock held by syz-executor0/7425: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x34/0x540 fs/block_dev.c:1842 1 lock held by syz-executor0/7426: 1 lock held by syz-executor0/7446: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 2 locks held by syz-executor1/7436: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: blkdev_reread_part+0x1e/0x40 block/ioctl.c:192 #1: 0000000041416c6e (&fc->fs_type->s_umount_key#46){++++}, at: __get_super.part.11+0x207/0x2e0 fs/super.c:789 1 lock held by syz-executor1/7472: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 1 lock held by blkid/7434: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x34/0x540 fs/block_dev.c:1842 1 lock held by syz-executor3/7444: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 1 lock held by syz-executor3/7447: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 1 lock held by syz-executor4/7440: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x34/0x540 fs/block_dev.c:1842 1 lock held by syz-executor4/7442: #0: 00000000f178d7b0 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13b0 fs/block_dev.c:1492 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1034 Comm: khungtaskd Not tainted 4.20.0-rc7-next-20181224 #189 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+0x1d3/0x2c6 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1c2/0x22c 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xba1/0x11a0 kernel/hung_task.c:287 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.417 msecs NMI backtrace for cpu 0 CPU: 0 PID: 7426 Comm: syz-executor0 Not tainted 4.20.0-rc7-next-20181224 #189 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x4a/0x8d0 kernel/locking/lockdep.c:3398 Code: 54 53 48 8d 9d 38 ff ff ff 48 c1 eb 03 48 81 ec c8 00 00 00 48 c7 85 38 ff ff ff b3 8a b5 41 48 c7 85 40 ff ff ff 6f b8 33 89 <48> 8d 04 13 48 c7 85 48 ff ff ff a0 33 63 81 c7 00 f1 f1 f1 f1 c7 RSP: 0018:ffff888053e16a20 EFLAGS: 00000082 RAX: 0000000000000005 RBX: 1ffff1100a7c2d49 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff8979f040 RDI: ffff88805425ceb8 RBP: ffff888053e16b10 R08: ffff88805425c600 R09: ffffed1015cc5b8f R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff88805425c600 R13: ffff88805425cea8 R14: ffff888053e16ae8 R15: 0000000000000001 FS: 00007f2e54498700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000a81f8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held+0xb5/0x140 kernel/locking/lockdep.c:3661 lock_is_held_type+0x118/0x210 kernel/locking/lockdep.c:3879 lock_is_held include/linux/lockdep.h:337 [inline] rcu_read_lock_held+0xa9/0xc0 kernel/rcu/update.c:281 xa_entry include/linux/xarray.h:902 [inline] xas_reload include/linux/xarray.h:1250 [inline] find_get_entry+0xc9d/0x1120 mm/filemap.c:1501 pagecache_get_page+0x12f/0xf30 mm/filemap.c:1582 find_or_create_page include/linux/pagemap.h:323 [inline] grow_dev_page fs/buffer.c:947 [inline] grow_buffers fs/buffer.c:1029 [inline] __getblk_slow fs/buffer.c:1062 [inline] __getblk_gfp+0x4ca/0x1030 fs/buffer.c:1351 __bread_gfp+0x2d/0x300 fs/buffer.c:1385 sb_bread include/linux/buffer_head.h:307 [inline] fat__get_entry+0x5a6/0xa40 fs/fat/dir.c:101 fat_get_entry fs/fat/dir.c:129 [inline] fat_get_short_entry+0x13c/0x2c0 fs/fat/dir.c:878 fat_subdirs+0x142/0x290 fs/fat/dir.c:944 fat_read_root fs/fat/inode.c:1416 [inline] fat_fill_super+0x2a97/0x4240 fs/fat/inode.c:1855 vfat_fill_super+0x31/0x40 fs/fat/namei_vfat.c:1049 mount_bdev+0x30c/0x3e0 fs/super.c:1344 vfat_mount+0x34/0x40 fs/fat/namei_vfat.c:1056 legacy_get_tree+0x10c/0x220 fs/fs_context.c:641 vfs_get_tree+0x1ae/0x600 fs/super.c:1496 do_new_mount fs/namespace.c:2748 [inline] do_mount+0x1805/0x2020 fs/namespace.c:3070 ksys_mount+0x12d/0x140 fs/namespace.c:3286 __do_sys_mount fs/namespace.c:3300 [inline] __se_sys_mount fs/namespace.c:3297 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3297 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a42a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f2e54497a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2e54497b30 RCX: 000000000045a42a RDX: 00007f2e54497ad0 RSI: 00000000200002c0 RDI: 00007f2e54497af0 RBP: 00000000200002c0 R08: 00007f2e54497b30 R09: 00007f2e54497ad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000004dae30 R15: 00000000ffffffff