INFO: task syz-executor.1:6418 blocked for more than 143 seconds. Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:29352 pid:6418 tgid:6418 ppid:6169 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747 paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 vt_ioctl+0x81a/0x1f00 drivers/tty/vt/vt_ioctl.c:761 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f81cd679669 RSP: 002b:00007f81ce7a50c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f81cd78c030 RCX: 00007f81cd679669 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00007f81cd6d4fd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f81cd78c030 R15: 00007ffeb7665568 INFO: task syz-executor.4:6420 blocked for more than 143 seconds. Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:29352 pid:6420 tgid:6420 ppid:6173 task_flags:0x400140 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747 paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 vt_ioctl+0x81a/0x1f00 drivers/tty/vt/vt_ioctl.c:761 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2c2aa79669 RSP: 002b:00007f2c2bc900c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2c2ab8c030 RCX: 00007f2c2aa79669 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00007f2c2aad4fd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f2c2ab8c030 R15: 00007ffd5fe775b8 INFO: task syz-executor.3:6421 blocked for more than 144 seconds. Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:29352 pid:6421 tgid:6421 ppid:6172 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747 paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 vt_ioctl+0x81a/0x1f00 drivers/tty/vt/vt_ioctl.c:761 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6024479669 RSP: 002b:00007f602559f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f602458c030 RCX: 00007f6024479669 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00007f60244d4fd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f602458c030 R15: 00007fff6a4ca178 INFO: task syz-executor.5:6425 blocked for more than 144 seconds. Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:29352 pid:6425 tgid:6425 ppid:6170 task_flags:0x400140 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747 paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 vt_ioctl+0x81a/0x1f00 drivers/tty/vt/vt_ioctl.c:761 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2739879669 RSP: 002b:00007f273aa130c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f273998c030 RCX: 00007f2739879669 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00007f27398d4fd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f273998c030 R15: 00007ffc41dca428 INFO: task syz-executor.2:6431 blocked for more than 144 seconds. Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:29352 pid:6431 tgid:6431 ppid:6168 task_flags:0x400140 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:747 paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 vt_ioctl+0x81a/0x1f00 drivers/tty/vt/vt_ioctl.c:761 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fabfec79669 RSP: 002b:00007fabffd7a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fabfed8c030 RCX: 00007fabfec79669 RDX: 00000000200000c0 RSI: 000000000000541c RDI: 0000000000000003 RBP: 00007fabfecd4fd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fabfed8c030 R15: 00007ffeefa2b978 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e13f060 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 2 locks held by getty/5587: #0: ffff8880351620a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 2 locks held by syz-executor.0/6408: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.1/6418: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.4/6420: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.3/6421: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.5/6425: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.2/6431: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.0/6434: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.3/6448: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.1/6446: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.5/6454: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.4/6457: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.2/6464: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.0/6467: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.1/6469: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.5/6478: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.4/6480: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.2/6483: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.0/6486: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.5/6489: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 2 locks held by syz-executor.4/6492: #0: ffff88807beb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffff88801a4990b8 (&buf->lock){+.+.}-{4:4}, at: paste_selection+0x14b/0x6f0 drivers/tty/vt/selection.c:419 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xfee/0x1030 kernel/hung_task.c:470 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.15.0-syzkaller-13655-gbdc7f8c5adad #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82 Code: 4e 4c aa f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d a3 35 22 00 f3 0f 1e fa fb f4 23 4c aa f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000197de0 EFLAGS: 00000282 RAX: 501f788c70ed3300 RBX: ffffffff81976058 RCX: 501f788c70ed3300 RDX: 0000000000000001 RSI: ffffffff8d981621 RDI: ffffffff8be28200 RBP: ffffc90000197f20 R08: ffff8880b8732f5b R09: 1ffff110170e65eb R10: dffffc0000000000 R11: ffffed10170e65ec R12: ffffffff8fa112f0 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff1100395bb40 FS: 0000000000000000(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f08243d660 CR3: 000000000df38000 CR4: 0000000000350ef0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:743 default_idle_call+0x74/0xb0 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0x1e8/0x510 kernel/sched/idle.c:325 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:423 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315 common_startup_64+0x13e/0x147