INFO: task syz-executor.3:5577 blocked for more than 143 seconds. Not tainted 6.4.0-syzkaller-09447-g6cdbb0907a3c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:28744 pid:5577 ppid:5364 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 vt_ioctl+0x9da/0x20c0 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x90d/0xda0 drivers/tty/tty_io.c:2777 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x4665e9 RSP: 002b:00007fd1c237d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffca727ca7f R14: 00007fd1c237d300 R15: 0000000000022000 INFO: task syz-executor.5:5564 blocked for more than 143 seconds. Not tainted 6.4.0-syzkaller-09447-g6cdbb0907a3c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26696 pid:5564 ppid:5366 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 vt_ioctl+0x9da/0x20c0 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x90d/0xda0 drivers/tty/tty_io.c:2777 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x4665e9 RSP: 002b:00007fce07eef188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff180ad81f R14: 00007fce07eef300 R15: 0000000000022000 INFO: task syz-executor.2:5566 blocked for more than 143 seconds. Not tainted 6.4.0-syzkaller-09447-g6cdbb0907a3c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26696 pid:5566 ppid:5361 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1873/0x48f0 kernel/sched/core.c:6710 schedule+0xc3/0x180 kernel/sched/core.c:6786 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 vt_ioctl+0x9da/0x20c0 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x90d/0xda0 drivers/tty/tty_io.c:2777 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x4665e9 RSP: 002b:00007f9bd52e3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffab605e1f R14: 00007f9bd52e3300 R15: 0000000000022000 Showing all locks held in the system: 5 locks held by kworker/0:1/9: #0: ffff8880b983bf98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 #1: ffff8880b98287c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a7/0x770 kernel/sched/psi.c:983 #2: ffff8880b98295d8 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x120/0x260 kernel/time/timer.c:999 #3: ffffffff92208338 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x163/0x530 lib/debugobjects.c:717 #4: ffffffff92201df8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x163/0x530 lib/debugobjects.c:717 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8d326af0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/14: #0: ffffffff8d326eb0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffffffff8d326920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 5 locks held by kworker/u4:6/2797: 2 locks held by getty/4747: #0: ffff88814a7d1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900015d02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1db0 drivers/tty/n_tty.c:2176 2 locks held by syz-executor.1/5550: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.3/5577: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.5/5564: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.2/5566: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.0/5583: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.4/5591: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.5/5594: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.2/5605: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.4/5610: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.1/5615: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 2 locks held by syz-executor.2/5621: #0: ffff888015aa5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff8880132420b8 (&buf->lock){+.+.}-{3:3}, at: paste_selection+0x168/0x510 drivers/tty/vt/selection.c:391 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.4.0-syzkaller-09447-g6cdbb0907a3c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xec2/0xf00 kernel/hung_task.c:379 kthread+0x2b8/0x350 kernel/kthread.c:389 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2797 Comm: kworker/u4:6 Not tainted 6.4.0-syzkaller-09447-g6cdbb0907a3c #0 Hardware SeaBIOS (version 1.8.2-google)