INFO: task kworker/0:5:5900 blocked for more than 143 seconds.
      Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:5     state:D stack:21552 pid:5900  tgid:5900  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events console_callback
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
 ___down_common+0x2d7/0x460 kernel/locking/semaphore.c:225
 __down_common kernel/locking/semaphore.c:246 [inline]
 __down+0x20/0x30 kernel/locking/semaphore.c:254
 down+0x74/0xa0 kernel/locking/semaphore.c:63
 console_lock+0x5b/0xa0 kernel/printk/printk.c:2833
 console_callback+0x63/0x4c0 drivers/tty/vt/vt.c:3120
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task kworker/0:6:5902 blocked for more than 143 seconds.
      Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:6     state:D stack:21376 pid:5902  tgid:5902  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events vc_SAK
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6913
 __mutex_lock_common kernel/locking/mutex.c:662 [inline]
 __mutex_lock+0x6bd/0xb10 kernel/locking/mutex.c:730
 tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:229
 tty_ldisc_flush+0x64/0xe0 drivers/tty/tty_ldisc.c:388
 __do_SAK+0x6a7/0x800 drivers/tty/tty_io.c:3037
 vc_SAK+0x7f/0x310 drivers/tty/vt/vt_ioctl.c:993
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task kworker/u8:8:5912 blocked for more than 143 seconds.
      Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:8    state:D stack:23840 pid:5912  tgid:5912  ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
 ___down_common+0x2d7/0x460 kernel/locking/semaphore.c:225
 __down_common kernel/locking/semaphore.c:246 [inline]
 __down+0x20/0x30 kernel/locking/semaphore.c:254
 down+0x74/0xa0 kernel/locking/semaphore.c:63
 console_lock+0x5b/0xa0 kernel/printk/printk.c:2833
 do_con_write+0x154/0x7bb0 drivers/tty/vt/vt.c:3056
 con_put_char+0x74/0xa0 drivers/tty/vt/vt.c:3440
 tty_put_char+0xbc/0x160 drivers/tty/tty_io.c:3166
 n_tty_process_echo_ops drivers/tty/n_tty.c:664 [inline]
 __process_echoes+0x80a/0xb40 drivers/tty/n_tty.c:709
 flush_echoes drivers/tty/n_tty.c:807 [inline]
 __receive_buf drivers/tty/n_tty.c:1642 [inline]
 n_tty_receive_buf_common+0xa2a/0x1980 drivers/tty/n_tty.c:1739
 tty_ldisc_receive_buf+0xa2/0x190 drivers/tty/tty_buffer.c:387
 tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:445 [inline]
 flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task syz.4.2119:12684 blocked for more than 143 seconds.
      Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2119      state:D stack:26744 pid:12684 tgid:12684 ppid:5821   task_flags:0x40044c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
 down_write_failed drivers/tty/tty_ldsem.c:262 [inline]
 __ldsem_down_write_nested+0x378/0x8d0 drivers/tty/tty_ldsem.c:324
 __tty_ldisc_lock drivers/tty/tty_ldisc.c:289 [inline]
 tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:352 [inline]
 tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:366 [inline]
 tty_ldisc_release+0x159/0x2a0 drivers/tty/tty_ldisc.c:780
 tty_release_struct+0x23/0xe0 drivers/tty/tty_io.c:1690
 tty_release+0xe25/0x1410 drivers/tty/tty_io.c:1861
 __fput+0x3ff/0xb70 fs/file_table.c:450
 task_work_run+0x14e/0x250 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xad8/0x2d70 kernel/exit.c:938
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
 get_signal+0x24ed/0x26c0 kernel/signal.c:3036
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc9725c1609
RSP: 002b:00007ffed1b2e138 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
RAX: 0000000000000512 RBX: 00007fc972543a20 RCX: 00007fc9725c1609
RDX: 00007fc972543a20 RSI: 0000000000000058 RDI: 00007ffed1b2e180
RBP: 00007fc97346a6c0 R08: 00007fc97346a6c0 R09: 00007ffed1b2e267
R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8
R13: 000000000000006e R14: 00007ffed1b2e180 R15: 00007ffed1b2e268
 </TASK>
INFO: task syz.0.2160:12810 blocked for more than 143 seconds.
      Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2160      state:D stack:27400 pid:12810 tgid:12809 ppid:5820   task_flags:0x400140 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
 ___down_common+0x2d7/0x460 kernel/locking/semaphore.c:225
 __down_common kernel/locking/semaphore.c:246 [inline]
 __down+0x20/0x30 kernel/locking/semaphore.c:254
 down+0x74/0xa0 kernel/locking/semaphore.c:63
 console_lock+0x5b/0xa0 kernel/printk/printk.c:2833
 con_install+0x9a/0x600 drivers/tty/vt/vt.c:3515
 tty_driver_install_tty drivers/tty/tty_io.c:1304 [inline]
 tty_init_dev.part.0+0x99/0x660 drivers/tty/tty_io.c:1416
 tty_init_dev include/linux/err.h:67 [inline]
 tty_open_by_driver drivers/tty/tty_io.c:2082 [inline]
 tty_open+0xac1/0xf80 drivers/tty/tty_io.c:2129
 chrdev_open+0x237/0x6a0 fs/char_dev.c:414
 do_dentry_open+0x735/0x1c40 fs/open.c:955
 vfs_open+0x82/0x3f0 fs/open.c:1085
 do_open fs/namei.c:3830 [inline]
 path_openat+0x1e88/0x2d80 fs/namei.c:3989
 do_filp_open+0x20c/0x470 fs/namei.c:4016
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1453
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa13fd8b710
RSP: 002b:00007fa140c2db70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa13fd8b710
RDX: 0000000000000002 RSI: 00007fa140c2dc10 RDI: 00000000ffffff9c
RBP: 00007fa140c2dc10 R08: 0000000000000000 R09: 00007fa140c2d986
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa13ffa5fa0 R15: 00007ffd5296d428
 </TASK>
INFO: task syz.3.2167:12841 blocked for more than 143 seconds.
      Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2167      state:D stack:27800 pid:12841 tgid:12839 ppid:5819   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6913
 __mutex_lock_common kernel/locking/mutex.c:662 [inline]
 __mutex_lock+0x6bd/0xb10 kernel/locking/mutex.c:730
 ptmx_open drivers/tty/pty.c:823 [inline]
 ptmx_open+0xf6/0x350 drivers/tty/pty.c:790
 chrdev_open+0x237/0x6a0 fs/char_dev.c:414
 do_dentry_open+0x735/0x1c40 fs/open.c:955
 vfs_open+0x82/0x3f0 fs/open.c:1085
 do_open fs/namei.c:3830 [inline]
 path_openat+0x1e88/0x2d80 fs/namei.c:3989
 do_filp_open+0x20c/0x470 fs/namei.c:4016
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1453
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d1ab8cda9
RSP: 002b:00007f4d1b9b0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4d1ada6080 RCX: 00007f4d1ab8cda9
RDX: 0000000000000041 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f4d1ac0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4d1ada6080 R15: 00007ffd920e16e8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0xf62/0x12b0 kernel/hung_task.c:399
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111