INFO: task syz-executor3:4543 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D21352 4543 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fcf0 Code: 48 89 1d fb cf 00 02 48 89 d6 48 29 c2 48 29 d1 48 01 c1 48 89 0d 00 d0 00 02 48 89 1d e9 cf 00 02 48 89 1d ea cf 00 02 0f b6 <4c> 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 RSP: 002b:00007fffe9b3a608 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fffe9b3a630 RCX: 000000000040fcf0 RDX: 00007fffe9b3b3ca RSI: 0000000000000002 RDI: 00007fffe9b3b3c0 RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000001380 R14: 00007fffe9b3acb0 R15: 00000000007034c0 INFO: task syz-executor4:4546 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D21232 4546 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fcf0 Code: 48 89 1d fb cf 00 02 48 89 d6 48 29 c2 48 29 d1 48 01 c1 48 89 0d 00 d0 00 02 48 89 1d e9 cf 00 02 48 89 1d ea cf 00 02 0f b6 <4c> 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 RSP: 002b:00007ffc65518f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc65518f40 RCX: 000000000040fcf0 RDX: 00007ffc65519cda RSI: 0000000000000002 RDI: 00007ffc65519cd0 RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000001380 R14: 00007ffc655195c0 R15: 00000000007034c0 INFO: task syz-executor7:4547 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D20072 4547 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fcf0 Code: 48 89 1d fb cf 00 02 48 89 d6 48 29 c2 48 29 d1 48 01 c1 48 89 0d 00 d0 00 02 48 89 1d e9 cf 00 02 48 89 1d ea cf 00 02 0f b6 <4c> 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 RSP: 002b:00007fffb659f958 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fffb659f980 RCX: 000000000040fcf0 RDX: 00007fffb65a071a RSI: 0000000000000002 RDI: 00007fffb65a0710 RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000001380 R14: 00007fffb65a0000 R15: 00000000007034c0 INFO: task syz-executor2:4551 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D22288 4551 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fcf0 Code: 48 89 1d fb cf 00 02 48 89 d6 48 29 c2 48 29 d1 48 01 c1 48 89 0d 00 d0 00 02 48 89 1d e9 cf 00 02 48 89 1d ea cf 00 02 0f b6 <4c> 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 RSP: 002b:00007ffe6a63d348 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffe6a63d370 RCX: 000000000040fcf0 RDX: 00007ffe6a63e10a RSI: 0000000000000002 RDI: 00007ffe6a63e100 RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000001380 R14: 00007ffe6a63d9f0 R15: 00000000007034c0 INFO: task syz-executor5:4553 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D21232 4553 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fcf0 Code: 48 89 1d fb cf 00 02 48 89 d6 48 29 c2 48 29 d1 48 01 c1 48 89 0d 00 d0 00 02 48 89 1d e9 cf 00 02 48 89 1d ea cf 00 02 0f b6 <4c> 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 RSP: 002b:00007ffd46afe098 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffd46afe0c0 RCX: 000000000040fcf0 RDX: 00007ffd46afee5a RSI: 0000000000000002 RDI: 00007ffd46afee50 RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000001380 R14: 00007ffd46afe740 R15: 00000000007034c0 INFO: task syz-executor6:4555 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D19720 4555 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x40fcf0 Code: 48 89 1d fb cf 00 02 48 89 d6 48 29 c2 48 29 d1 48 01 c1 48 89 0d 00 d0 00 02 48 89 1d e9 cf 00 02 48 89 1d ea cf 00 02 0f b6 <4c> 24 27 88 0d ef cf 00 02 48 8b 0d c8 cf 00 02 48 f7 c1 ff 1f 00 RSP: 002b:00007ffe0f11a518 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffe0f11a540 RCX: 000000000040fcf0 RDX: 00007ffe0f11b2da RSI: 0000000000000002 RDI: 00007ffe0f11b2d0 RBP: 0000000000000013 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000001380 R14: 00007ffe0f11abc0 R15: 00000000007034c0 INFO: task blkid:13205 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D23984 13205 4500 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7efcc6349120 Code: Bad RIP value. RSP: 002b:00007ffc914f7788 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efcc6349120 RDX: 00007ffc914f9f34 RSI: 0000000000000000 RDI: 00007ffc914f9f34 RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001209030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 INFO: task blkid:13206 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D23984 13206 2741 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb2b7c11120 Code: Bad RIP value. RSP: 002b:00007ffc435ee5a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb2b7c11120 RDX: 00007ffc435eff41 RSI: 0000000000000000 RDI: 00007ffc435eff41 RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001566030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 INFO: task blkid:13207 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #155 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D23984 13207 6564 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3603 __mutex_lock_common kernel/locking/mutex.c:834 [inline] __mutex_lock+0xede/0x1820 kernel/locking/mutex.c:894 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:909 lo_open+0x1b/0xb0 drivers/block/loop.c:1632 __blkdev_get+0x360/0x13c0 fs/block_dev.c:1479 blkdev_get+0xc1/0xb50 fs/block_dev.c:1614 blkdev_open+0x1fb/0x280 fs/block_dev.c:1772 do_dentry_open+0x818/0xe40 fs/open.c:794 vfs_open+0x139/0x230 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x174a/0x4e10 fs/namei.c:3540 do_filp_open+0x255/0x380 fs/namei.c:3574 do_sys_open+0x584/0x760 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1114 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb995157120 Code: Bad RIP value. RSP: 002b:00007ffc3ef384d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb995157120 RDX: 00007ffc3ef38f34 RSI: 0000000000000000 RDI: 00007ffc3ef38f34 RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001da3030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 Showing all locks held in the system: 1 lock held by khungtaskd/901: #0: 000000005358729d (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 2 locks held by getty/4493: #0: 000000009a87fcf1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000007fa66d0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4494: #0: 00000000a719d481 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f18a96b0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4495: #0: 00000000a71bbdd4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000199a6804 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4496: #0: 0000000022b6ec77 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000087f39d35 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4497: #0: 00000000f5f19c25 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000a6d2b699 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4498: #0: 000000001fccd037 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000fde95a19 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4499: #0: 0000000091f95e71 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000afa80371 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor3/4543: #0: 000000003ff7fbb8 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 2 locks held by syz-executor4/4546: #0: 000000007f64fbcf (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000aa45e5f7 (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 2 locks held by syz-executor7/4547: #0: 00000000bdc597ee (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000aa45e5f7 (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 1 lock held by syz-executor2/4551: #0: 000000000a719a42 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 2 locks held by syz-executor5/4553: #0: 00000000a9d84d7a (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000aa45e5f7 (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 1 lock held by syz-executor6/4555: #0: 000000008441024d (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 2 locks held by syz-executor1/13204: 2 locks held by blkid/13205: #0: 000000008441024d (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000aa45e5f7 (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 2 locks held by blkid/13206: #0: 000000003ff7fbb8 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000aa45e5f7 (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 2 locks held by blkid/13207: #0: 000000000a719a42 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x19b/0x13c0 fs/block_dev.c:1463 #1: 00000000aa45e5f7 (loop_index_mutex){+.+.}, at: lo_open+0x1b/0xb0 drivers/block/loop.c:1632 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc5+ #155 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.4+0x19/0xce lib/nmi_backtrace.c:103 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:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54