INFO: task hung in vt

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
linux-4.19	INFO: task hung in vt_ioctl	1	1	1973d	1973d	0/1	auto-closed as invalid on 2020/09/24 20:12
upstream	INFO: task hung in vt_ioctl (3) serial	1	1	942d	942d	0/29	auto-obsoleted due to no activity on 2023/06/22 09:16
upstream	INFO: task hung in vt_ioctl serial	1	1	2067d	2067d	0/29	auto-closed as invalid on 2020/05/23 20:53
upstream	INFO: task hung in vt_ioctl (2) serial	1	2	1936d	1975d	0/29	auto-closed as invalid on 2020/10/01 08:58
upstream	INFO: task hung in vt_ioctl (5) kernel	1	1	227d	227d	0/29	auto-obsoleted due to no activity on 2025/06/06 19:57

INFO: task syz-executor.0:28692 blocked for more than 143 seconds. Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27808 pid:28692 ppid:5077 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5382 [inline] __schedule+0xee1/0x5a10 kernel/sched/core.c:6695 schedule+0xe7/0x1b0 kernel/sched/core.c:6771 schedule_timeout+0x278/0x2c0 kernel/time/timer.c:2143 ___down_common kernel/locking/semaphore.c:225 [inline] __down_common+0x327/0x6c0 kernel/locking/semaphore.c:246 down+0x74/0xa0 kernel/locking/semaphore.c:63 console_lock+0x96/0x150 kernel/printk/printk.c:2652 vt_ioctl+0x144d/0x2ff0 drivers/tty/vt/vt_ioctl.c:815 tty_ioctl+0x663/0x1580 drivers/tty/tty_io.c:2776 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa56827cae9 RSP: 002b:00007fa568fea0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa56839bf80 RCX: 00007fa56827cae9 RDX: 0000000020000280 RSI: 0000000000005603 RDI: 0000000000000005 RBP: 00007fa5682c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fa56839bf80 R15: 00007fa5684bfa48 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8cbab2e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline] #0: ffffffff8cbab2e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline] #0: ffffffff8cbab2e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613 2 locks held by getty/4797: #0: ffff88802602c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc5/0x1480 drivers/tty/n_tty.c:2206 2 locks held by kworker/0:2/23325: #0: ffff888012c70d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605 #1: ffffc900035d7d80 (console_work){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606 2 locks held by kworker/u4:15/7173: 2 locks held by kworker/u4:29/8905: 2 locks held by syz-executor.0/28717: 3 locks held by syz-executor.0/28882: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x299/0x300 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+0xf87/0x1210 kernel/hung_task.c:379 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8905 Comm: kworker/u4:29 Not tainted 6.6.0-rc2-syzkaller-00018-g2cf0f7156238 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Workqueue: bat_events batadv_dat_purge RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline] RIP: 0010:lockdep_hardirqs_on+0x51/0x100 kernel/locking/lockdep.c:4408 Code: 00 00 f0 00 48 89 fd 75 41 65 8b 05 09 4d c4 75 85 c0 75 69 65 8b 05 1a 4a c4 75 85 c0 75 5e 8b 35 14 99 ef 07 85 f6 75 21 9c <58> f6 c4 02 75 7a 8b 15 03 99 ef 07 85 d2 75 10 48 8b 83 b8 0a 00 RSP: 0018:ffffc9000a227c40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88802ed7d940 RCX: 1ffffffff234ae60 RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffffff814fcb64 RBP: ffffffff814fcb64 R08: 0000000000000001 R09: fffffbfff233ddf0 R10: ffffffff919eef87 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88802ed25b90 R14: ffffffff8a057c20 R15: 0000000000000372 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f31c4f77978 CR3: 000000000c976000 CR4: 00000000003506e0 Call Trace: <NMI> </NMI> <TASK> __local_bh_enable_ip+0xa4/0x120 kernel/softirq.c:386 spin_unlock_bh include/linux/spinlock.h:396 [inline] __batadv_dat_purge.part.0+0x27d/0x3b0 net/batman-adv/distributed-arp-table.c:186 __batadv_dat_purge net/batman-adv/distributed-arp-table.c:167 [inline] batadv_dat_purge+0x4b/0xa0 net/batman-adv/distributed-arp-table.c:205 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK>