INFO: task syz.4.6346:30158 blocked for more than 143 seconds. Not tainted 6.12.0-rc7-syzkaller-00216-gf66d6acccbc0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.6346 state:D stack:25008 pid:30158 tgid:30155 ppid:22527 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6693 __schedule_loop kernel/sched/core.c:6770 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6785 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2591 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 __flush_work+0xa37/0xc50 kernel/workqueue.c:4217 __cancel_work_sync+0xbc/0x110 kernel/workqueue.c:4337 rfkill_unregister+0x96/0x230 net/rfkill/core.c:1139 nfc_unregister_device+0x96/0x2a0 net/nfc/core.c:1167 virtual_ncidev_close+0x56/0x90 drivers/nfc/virtual_ncidev.c:172 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x16a3/0x1740 kernel/signal.c:2918 arch_do_signal_or_restart+0x96/0x860 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:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc26177e719 RSP: 002b:00007fc262552038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: 0000000000000008 RBX: 00007fc261936130 RCX: 00007fc26177e719 RDX: 0000000000000002 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007fc2617f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc261936130 R15: 00007ffd071c7978 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 2 locks held by getty/5580: #0: ffff8880313cb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 4 locks held by kworker/0:2/11963: #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc9000fbc7d00 ((work_completion)(&rfkill->sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000fbc7d00 ((work_completion)(&rfkill->sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8ff98ce8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_sync_work+0x23/0x220 net/rfkill/core.c:1055 #3: ffff88802c922100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #3: ffff88802c922100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down net/nfc/core.c:143 [inline] #3: ffff88802c922100 (&dev->mutex){....}-{3:3}, at: nfc_rfkill_set_block+0x50/0x310 net/nfc/core.c:179 1 lock held by syz-executor/22527: #0: ffffffff8ff98ce8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xd0/0x230 net/rfkill/core.c:1145 3 locks held by kworker/1:5/25257: #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc9000af27d00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000af27d00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8ff98ce8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_global_led_trigger_worker+0x27/0xd0 net/rfkill/core.c:182 4 locks held by kworker/u8:6/25273: #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc9000ae97d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000ae97d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcb4dd0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:580 #3: ffffffff8ff98ce8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xd0/0x230 net/rfkill/core.c:1145 2 locks held by syz-executor/30084: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 #1: ffffffff8ff98ce8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_open+0x131/0x850 net/rfkill/core.c:1178 1 lock held by syz.4.6346/30158: #0: ffff88802c922100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #0: ffff88802c922100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x63/0x2a0 net/nfc/core.c:1165 3 locks held by syz.2.6353/30186: #0: ffffffff8fd27610 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8fd274c8 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffffffff8fd274c8 (genl_mutex){+.+.}-{3:3}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffffffff8fd274c8 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209 #2: ffffffff8ff98ce8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xd0/0x230 net/rfkill/core.c:1145 1 lock held by syz.8.6355/30196: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz.6.6358/30206: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30209: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30211: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30213: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30215: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30217: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30219: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30221: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30223: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30225: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30227: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30229: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30231: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30233: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 1 lock held by syz-executor/30235: #0: ffffffff8f17e048 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc7-syzkaller-00216-gf66d6acccbc0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 29512 Comm: kworker/u8:9 Not tainted 6.12.0-rc7-syzkaller-00216-gf66d6acccbc0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:mark_usage kernel/locking/lockdep.c:4599 [inline] RIP: 0010:__lock_acquire+0xb2f/0x2050 kernel/locking/lockdep.c:5156 Code: a9 11 00 00 83 3d 60 ab ab 0e 00 0f 84 13 09 00 00 83 7c 24 60 00 48 8b 6c 24 40 0f 84 ff 00 00 00 48 8b 5c 24 20 0f b6 04 13 <84> c0 0f 85 d7 0d 00 00 41 8b 0f f7 c1 00 80 00 00 0f 85 c5 00 00 RSP: 0018:ffffc9000358f850 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 1ffff1100575fcaa RCX: ffffffff81706620 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff9429b8d8 RBP: ffff88802bafe530 R08: ffffffff9429b8df R09: 1ffffffff285371b R10: dffffc0000000000 R11: fffffbfff285371c R12: ffff88802bafda00 R13: ffff88802bafe4d8 R14: 0000000000000002 R15: ffff88802bafe550 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb8c8272f4 CR3: 000000000e734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] batadv_nc_purge_paths+0xe8/0x3b0 net/batman-adv/network-coding.c:442 batadv_nc_worker+0x328/0x610 net/batman-adv/network-coding.c:720 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244