INFO: task syz.1.519:7558 blocked for more than 145 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.519 state:D stack:26504 pid:7558 ppid:5784 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832 rwsem_down_read_slowpath+0x4f8/0x840 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1250 [inline] __down_read kernel/locking/rwsem.c:1263 [inline] down_read+0x98/0x2e0 kernel/locking/rwsem.c:1522 __super_lock fs/super.c:58 [inline] super_lock+0x167/0x360 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] iterate_supers+0x80/0x170 fs/super.c:977 ksys_sync+0x95/0x150 fs/sync.c:102 __ia32_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f220818efc9 RSP: 002b:00007f220903a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f22083e6180 RCX: 00007f220818efc9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f22083e6180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f22083e6218 R14: 00007f22083e6180 R15: 00007fff76c559c8 INFO: task syz.0.534:7595 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.534 state:D stack:26504 pid:7595 ppid:5791 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832 rwsem_down_read_slowpath+0x4f8/0x840 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1250 [inline] __down_read kernel/locking/rwsem.c:1263 [inline] down_read+0x98/0x2e0 kernel/locking/rwsem.c:1522 __super_lock fs/super.c:58 [inline] super_lock+0x167/0x360 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] iterate_supers+0x80/0x170 fs/super.c:977 ksys_sync+0x95/0x150 fs/sync.c:102 __ia32_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f6e2cf8efc9 RSP: 002b:00007f6e2b1b4038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f6e2d1e6180 RCX: 00007f6e2cf8efc9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f6e2d1e6180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6e2d1e6218 R14: 00007f6e2d1e6180 R15: 00007ffe8c11b488 INFO: task syz.3.581:7706 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.581 state:D stack:25416 pid:7706 ppid:5788 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5380 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699 schedule+0xbd/0x170 kernel/sched/core.c:6773 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832 rwsem_down_read_slowpath+0x4f8/0x840 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1250 [inline] __down_read kernel/locking/rwsem.c:1263 [inline] down_read+0x98/0x2e0 kernel/locking/rwsem.c:1522 __super_lock fs/super.c:58 [inline] super_lock+0x167/0x360 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] iterate_supers+0x80/0x170 fs/super.c:977 ksys_sync+0x95/0x150 fs/sync.c:102 __ia32_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff85178efc9 RSP: 002b:00007ff84f9f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007ff8519e6180 RCX: 00007ff85178efc9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ff8519e6180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff8519e6218 R14: 00007ff8519e6180 R15: 00007ffc55220c68 Showing all locks held in the system: 1 lock held by pool_workqueue_/3: #0: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline] #0: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x360/0x830 kernel/rcu/tree_exp.h:1004 3 locks held by kworker/0:1/9: #0: ffff888017870938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline] #0: ffff888017870938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711 #1: ffffc900000e7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline] #1: ffffc900000e7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711 #2: ffff888051a41240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x26c/0x3170 drivers/net/netdevsim/fib.c:1491 1 lock held by khungtaskd/29: #0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633 2 locks held by getty/5546: #0: ffff88802c39c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217 2 locks held by kworker/0:3/5773: #0: ffff888017872538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline] #0: ffff888017872538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711 #1: ffffc9000451fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline] #1: ffffc9000451fd00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711 1 lock held by syz.4.344/7095: #0: ffff88807d3d60e0 (&type->s_umount_key#61/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x920 fs/super.c:352 1 lock held by syz.1.519/7558: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.0.534/7595: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.3.581/7706: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.5.597/7748: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.6.604/7796: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.7.649/7974: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.8.663/8044: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.9.680/8136: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.4.666/8172: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.2.701/8239: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.1.702/8250: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.3.729/8402: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.6.735/8470: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.5.745/8505: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.0.747/8516: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.7.738/8537: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 1 lock held by syz.8.754/8597: #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d3d60e0 (&type->s_umount_key#88){.+.+}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 4 locks held by syz-executor/8616: #0: ffff88802fb38e70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:521 [inline] #0: ffff88802fb38e70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x212/0x510 net/bluetooth/hci_core.c:2709 #1: ffff88802fb380b8 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x4c9/0xfb0 net/bluetooth/hci_sync.c:5268 #2: ffffffff8e1295c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2003 [inline] #2: ffffffff8e1295c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa1/0x220 net/bluetooth/hci_conn.c:2540 #3: ffff88804454d338 (&conn->lock#2){+.+.}-{3:3}, at: l2cap_conn_del+0x70/0x660 net/bluetooth/l2cap_core.c:1762 2 locks held by syz.9.757/8633: #0: ffffffff8dfbbc08 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8dfbbc08 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x41/0x1c0 drivers/net/tun.c:3511 #1: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline] #1: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x448/0x830 kernel/rcu/tree_exp.h:1004 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf41/0xf80 kernel/hung_task.c:379 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1072 Comm: kworker/u4:5 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events_unbound cfg80211_wiphy_work RIP: 0010:__sanitizer_cov_trace_switch+0x6f/0x120 kernel/kcov.c:349 Code: 0f 85 cb 00 00 00 b9 07 00 00 00 48 85 c0 75 13 e9 bc 00 00 00 b9 01 00 00 00 48 85 c0 0f 84 ae 00 00 00 41 57 41 56 41 54 53 <48> 8b 54 24 20 65 4c 8b 05 04 23 7e 7e 45 31 c9 eb 08 49 ff c1 4c RSP: 0018:ffffc9000473eec8 EFLAGS: 00000202 RAX: 0000000000000002 RBX: ffffffff8ecc43cc RCX: 0000000000000003 RDX: 0000000000000000 RSI: ffffffff8cb9e740 RDI: 0000000000000002 RBP: ffffc9000473f078 R08: ffff888023503c00 R09: 0000000000000003 R10: 0000000000000004 R11: 0000000000000000 R12: ffffc9000473f028 R13: dffffc0000000000 R14: 0000000000000002 R15: ffffffff8ecc43d1 FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc3b72ec98 CR3: 000000000cb30000 CR4: 00000000003506f0 Call Trace: unwind_next_frame+0x655/0x2970 arch/x86/kernel/unwind_orc.c:505 __unwind_start+0x66a/0x7e0 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xf8/0x190 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb4/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:721 [inline] cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2953 [inline] cfg80211_inform_bss_frame_data+0x760/0x12b0 net/wireless/scan.c:3013 ieee80211_bss_info_update+0x70b/0x930 net/mac80211/scan.c:211 ieee80211_rx_bss_info net/mac80211/ibss.c:1124 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline] ieee80211_ibss_rx_queued_mgmt+0x17c9/0x2ac0 net/mac80211/ibss.c:1642 ieee80211_iface_process_skb net/mac80211/iface.c:1643 [inline] ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1697 cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437 process_one_work kernel/workqueue.c:2634 [inline] process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293