INFO: task rs:main Q:Reg:5210 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. rs:main Q:Reg D15768 5210 1 0x00000000 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 file_start_write include/linux/fs.h:2758 [inline] vfs_write+0x42a/0x560 fs/read_write.c:548 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f4351d5b19d Code: Bad RIP value. RSP: 002b:00007f43502fc000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000000000f5 RCX: 00007f4351d5b19d RDX: 00000000000000f5 RSI: 0000000001563a90 RDI: 0000000000000005 RBP: 0000000001563a90 R08: 0000000001563af9 R09: 00007f43516d8347 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f43502fc480 R14: 0000000000000002 R15: 0000000001563890 INFO: task syz-executor0:5352 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D17328 5352 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 sb_start_write include/linux/fs.h:1566 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: Bad RIP value. RSP: 002b:00007fffed4df7e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007fffed4df800 RSI: 00007fffed4df890 RDI: 00007fffed4df890 RBP: 0000000000001453 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007fffed4e08f0 R13: 000000000235c940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor4:5354 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D17152 5354 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 sb_start_write include/linux/fs.h:1566 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_rmdir+0x1a3/0x630 fs/namei.c:3925 __do_sys_rmdir fs/namei.c:3959 [inline] __se_sys_rmdir fs/namei.c:3957 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3957 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456e07 Code: Bad RIP value. RSP: 002b:00007ffe2e1748f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000456e07 RDX: 0000000000000000 RSI: 00007ffe2e175a00 RDI: 00007ffe2e175a00 RBP: 00000000000015ce R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 00007ffe2e175a00 R13: 0000000001a3b940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor6:5358 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D17328 5358 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 sb_start_write include/linux/fs.h:1566 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: Bad RIP value. RSP: 002b:00007fff871d8b48 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007fff871d8b60 RSI: 00007fff871d8bf0 RDI: 00007fff871d8bf0 RBP: 000000000000159a R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007fff871d9c50 R13: 00000000025af940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor1:5359 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D16136 5359 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 sb_start_write include/linux/fs.h:1566 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: Bad RIP value. RSP: 002b:00007fffc3b247a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007fffc3b247c0 RSI: 00007fffc3b24850 RDI: 00007fffc3b24850 RBP: 0000000000001d66 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000202 R12: 00007fffc3b258b0 R13: 00000000020b2940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor2:16373 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D18720 16373 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 sb_start_write include/linux/fs.h:1566 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: Bad RIP value. RSP: 002b:00007ffe6cf63de8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007ffe6cf63e00 RSI: 00007ffe6cf63e90 RDI: 00007ffe6cf63e90 RBP: 00000000000009ca R08: 0000000000000000 R09: 0000000000000010 R10: 000000000000000a R11: 0000000000000206 R12: 00007ffe6cf64ef0 R13: 0000000001aa2940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor5:11799 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D16864 11799 5356 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 file_start_write include/linux/fs.h:2758 [inline] vfs_write+0x42a/0x560 fs/read_write.c:548 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007fc89cd61c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc89cd626d4 RCX: 0000000000457099 RDX: 00000000fffffe38 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d82c8 R14: 00000000004cada0 R15: 0000000000000000 INFO: task syz-executor5:11802 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D25400 11802 5356 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 sb_start_write include/linux/fs.h:1566 [inline] mnt_want_write_file+0x68/0x110 fs/namespace.c:418 ext4_ioctl+0xca9/0x4210 fs/ext4/ioctl.c:849 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: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007fc89cd40c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc89cd416d4 RCX: 0000000000457099 RDX: 0000000004000001 RSI: 000000000000660c RDI: 0000000000000003 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cfdc0 R14: 00000000004bec18 R15: 0000000000000001 INFO: task syz-executor5:11803 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D24904 11803 5356 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] __percpu_down_read+0x14c/0x1d0 kernel/locking/percpu-rwsem.c:85 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x340/0x370 fs/super.c:1387 sb_start_write include/linux/fs.h:1566 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_last fs/namei.c:3311 [inline] path_openat+0x4c9c/0x5160 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007fc89cd1fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fc89cd206d4 RCX: 0000000000457099 RDX: 0000000000002761 RSI: 0000000020000480 RDI: ffffffffffffffff RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3678 R14: 00000000004c83ea R15: 0000000000000002 INFO: task syz-executor5:11812 blocked for more than 140 seconds. Not tainted 4.19.0-rc2+ #230 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D26456 11812 5356 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575 __mutex_lock_common kernel/locking/mutex.c:1003 [inline] __mutex_lock+0xbfb/0x1710 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 __fdget_pos+0x1bb/0x200 fs/file.c:766 fdget_pos include/linux/file.h:70 [inline] ksys_write+0x7f/0x260 fs/read_write.c:593 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007fc89ccfec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc89ccff6d4 RCX: 0000000000457099 RDX: 00000000fffffe38 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d82c8 R14: 00000000004cada0 R15: 0000000000000003 Showing all locks held in the system: 1 lock held by khungtaskd/984: #0: 00000000134aa7cf (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4436 2 locks held by rs:main Q:Reg/5210: #0: 00000000450310ae (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 #1: 00000000f31cca67 (sb_writers#5){++++}, at: file_start_write include/linux/fs.h:2758 [inline] #1: 00000000f31cca67 (sb_writers#5){++++}, at: vfs_write+0x42a/0x560 fs/read_write.c:548 1 lock held by rsyslogd/5212: #0: 00000000ed8aafd8 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5303: #0: 0000000024196eef (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000032e52922 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5304: #0: 000000004d5393fb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000005bce4469 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5305: #0: 0000000037c69b65 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000002cc2bfd1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5306: #0: 00000000cf3a61bb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000ebe6b44e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5307: #0: 000000001769c1bd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000008da801b6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5308: #0: 00000000fc646819 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000a0240112 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5309: #0: 00000000fdd828b1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000002b147d1a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor0/5352: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor4/5354: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor6/5358: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor1/5359: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor4/11655: #0: 00000000f31cca67 (sb_writers#5){++++}, at: file_start_write include/linux/fs.h:2758 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: do_sendfile+0xac0/0xe20 fs/read_write.c:1439 1 lock held by syz-executor2/16373: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor0/23382: #0: 00000000f31cca67 (sb_writers#5){++++}, at: file_start_write include/linux/fs.h:2758 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: do_sendfile+0xac0/0xe20 fs/read_write.c:1439 2 locks held by syz-executor0/23464: 5 locks held by syz-executor0/23541: #0: 00000000f31cca67 (sb_writers#5){++++}, at: file_start_write include/linux/fs.h:2758 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: do_sendfile+0xac0/0xe20 fs/read_write.c:1439 #1: 000000008a0787c4 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1821 [inline] #1: 000000008a0787c4 (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3411 #2: 00000000134aa7cf (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:413 [inline] #2: 00000000134aa7cf (rcu_read_lock){....}, at: update_curr+0x383/0xbe0 kernel/sched/fair.c:829 #3: 000000006f8c307d (&(&virtscsi_vq->vq_lock)->rlock){-.-.}, at: virtscsi_kick_cmd+0x2f/0x130 drivers/scsi/virtio_scsi.c:473 #4: 000000008a0787c4 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1821 [inline] #4: 000000008a0787c4 (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3411 2 locks held by syz-executor5/11799: #0: 000000006e2464ff (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 #1: 00000000f31cca67 (sb_writers#5){++++}, at: file_start_write include/linux/fs.h:2758 [inline] #1: 00000000f31cca67 (sb_writers#5){++++}, at: vfs_write+0x42a/0x560 fs/read_write.c:548 1 lock held by syz-executor5/11802: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write_file+0x68/0x110 fs/namespace.c:418 1 lock held by syz-executor5/11803: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor5/11812: #0: 000000006e2464ff (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 1 lock held by syz-executor5/11813: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write_file+0x68/0x110 fs/namespace.c:418 1 lock held by syz-executor3/11782: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor3/11801: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 2 locks held by syz-executor7/11789: #0: 00000000b247195c (&bdev->bd_fsfreeze_mutex){+.+.}, at: freeze_bdev+0x2d/0x250 fs/block_dev.c:496 #1: 00000000f31cca67 (sb_writers#5){++++}, at: percpu_down_write+0xaf/0x540 kernel/locking/percpu-rwsem.c:145 1 lock held by syz-executor7/11805: #0: 00000000f31cca67 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1566 [inline] #0: 00000000f31cca67 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 984 Comm: khungtaskd Not tainted 4.19.0-rc2+ #230 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+0x1c4/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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+0xb3e/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 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:57