INFO: task syz-executor.1:8034 blocked for more than 143 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28200 8034 7941 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f8002ef0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8002ef16d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.5:8038 blocked for more than 144 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28200 8038 7946 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007fc42d2c0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc42d2c16d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.3:8042 blocked for more than 144 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28200 8042 7948 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f36815ddc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f36815de6d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.2:8045 blocked for more than 145 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28040 8045 7939 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007fac10422c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fac104236d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.2:8046 blocked for more than 145 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28200 8046 7939 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007fac10401c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fac104026d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.4:8050 blocked for more than 146 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28040 8050 7949 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f119b4a9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f119b4aa6d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.4:8051 blocked for more than 146 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28200 8051 7949 0x00000004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007f119b488c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f119b4896d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.0:8054 blocked for more than 147 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27976 8054 7943 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007fddf5b7dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddf5b7e6d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff INFO: task syz-executor.0:8056 blocked for more than 147 seconds. Not tainted 5.5.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28696 8056 7943 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x8a9/0x1970 kernel/sched/core.c:4081 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x8b5/0x1410 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 paste_selection+0x114/0x3d0 drivers/tty/vt/selection.c:361 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: Bad RIP value. RSP: 002b:00007fddf5b5cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fddf5b5d6d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1115: #0: ffffffff88d9e200 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x275 kernel/locking/lockdep.c:5333 1 lock held by rsyslogd/7733: #0: ffff88809fc83da0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa3/0xc0 fs/file.c:801 2 locks held by login/7824: #0: ffff88808fdec198 (&tty->legacy_mutex){+.+.}, at: tty_lock+0x68/0xb0 drivers/tty/tty_mutex.c:19 #1: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_write+0x2d/0x40 drivers/tty/tty_ldsem.c:366 2 locks held by getty/7825: #0: ffff88808bb40090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7826: #0: ffff888096554090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7827: #0: ffff8880a376a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7828: #0: ffff88809512d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000180b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7829: #0: ffff88808f6d8090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by getty/7830: #0: ffff8880942bb090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffffc9000177b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x17d0 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/8034: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.5/8038: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 3 locks held by syz-executor.3/8041: 2 locks held by syz-executor.3/8042: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/8045: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.2/8046: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.4/8050: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.4/8051: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.0/8054: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 2 locks held by syz-executor.0/8056: #0: ffff88808fdec090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:340 #1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x2b/0x30 drivers/tty/tty_buffer.c:61 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1115 Comm: khungtaskd Not tainted 5.5.0-rc7-syzkaller #0 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+0x12d/0x187 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x4b/0x84 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x18b/0x1b7 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:205 [inline] watchdog+0x611/0xc50 kernel/hung_task.c:289 kthread+0x331/0x3f0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8041 Comm: syz-executor.3 Not tainted 5.5.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_is_held kernel/locking/lockdep.c:4302 [inline] RIP: 0010:lock_is_held_type+0x179/0x300 kernel/locking/lockdep.c:4521 Code: 89 e3 45 31 f6 48 c1 eb 03 48 89 45 c8 48 b8 00 00 00 00 00 fc ff df 48 01 c3 41 8b 85 90 08 00 00 85 c0 7f 25 e9 0b 01 00 00 <0f> b6 03 41 83 c6 01 84 c0 74 08 3c 03 0f 8e 39 01 00 00 45 3b b5 RSP: 0018:ffffc90002c775b0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffffed101246a55a RCX: ffff888092352ad8 RDX: 0000000000000000 RSI: ffffffff88dc0580 RDI: ffff888092352b72 RBP: ffffc90002c775f8 R08: ffffed1015d4703d R09: ffffed1015d4703d R10: ffffed1015d4703c R11: ffff8880aea381e3 R12: ffff888092352ad0 R13: ffff888092352240 R14: 0000000000000003 R15: ffff888092352b50 FS: 00007f36815ff700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f119b467db8 CR3: 00000000a89c7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:361 [inline] task_css_set include/linux/cgroup.h:478 [inline] task_dfl_cgroup include/linux/cgroup.h:547 [inline] cgroup_account_cputime include/linux/cgroup.h:776 [inline] update_curr+0x637/0x8b0 kernel/sched/fair.c:860 pick_next_task_fair+0x21f/0xbb0 kernel/sched/fair.c:6680 pick_next_task kernel/sched/core.c:3921 [inline] __schedule+0x385/0x1970 kernel/sched/core.c:4051 schedule+0xc3/0x2b0 kernel/sched/core.c:4155 paste_selection+0x36d/0x3d0 drivers/tty/vt/selection.c:367 tioclinux+0x105/0x380 drivers/tty/vt/vt.c:3044 vt_ioctl+0x18d9/0x21f0 drivers/tty/vt/vt_ioctl.c:364 tty_ioctl+0x45b/0x12f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x196/0x1190 fs/ioctl.c:732 ksys_ioctl+0x62/0x90 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:754 do_syscall_64+0xca/0x5f0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f36815fec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f36815ff6d4 R13: 00000000004c5c45 R14: 00000000004dc038 R15: 00000000ffffffff