INFO: task syz.1.1438:10747 blocked for more than 143 seconds. Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.1438 state:R running task stack:27320 pid:10747 tgid:10745 ppid:5816 task_flags:0x40054c flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x116a/0x5de0 kernel/sched/core.c:6785 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7108 irqentry_exit+0x36/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 4080:0x1 Code: Unable to access opcode bytes at 0xffffffffffffffd7. RSP: 0f88:ffffffff8b7ff751 EFLAGS: 1ffff920036c7ea8 ORIG_RAX: 0000000000000001 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000002c1f16d4 RDX: 00000000c1f16d42 RSI: 000000005a674522 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000086865bf6 R09: ffffffff9746bf60 R10: ffffffff819862da R11: ffff88804b444880 R12: ffff88804b445398 R13: ffff88804b445370 R14: 0000000000000001 R15: e15f48f4b06d7000 Showing all locks held in the system: 2 locks held by kworker/0:0/9: 1 lock held by ksoftirqd/1/23: 1 lock held by khungtaskd/31: #0: ffffffff8e5c4880 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e5c4880 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e5c4880 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770 2 locks held by getty/5579: #0: ffff8880327850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222 1 lock held by syz-executor/5813: #0: ffffffff8e5cfe78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:336 7 locks held by kworker/0:3/5872: #0: ffff888023ebf948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213 #1: ffffc90003edfd10 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214 #2: ffff888143fb7198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #2: ffff888143fb7198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c0/0x4fa0 drivers/usb/core/hub.c:5863 #3: ffff8880236b7198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #3: ffff8880236b7198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004 #4: ffff888036f69160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #4: ffff888036f69160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004 #5: ffff888072cdda20 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #5: ffff888072cdda20 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004 #6: ffffffff8fb826e8 (input_mutex){+.+.}-{4:4}, at: class_mutex_intr_constructor include/linux/mutex.h:227 [inline] #6: ffffffff8fb826e8 (input_mutex){+.+.}-{4:4}, at: input_register_device+0x98a/0x1130 drivers/input/input.c:2408 6 locks held by kworker/0:8/5949: #0: ffff888023ebf948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213 #1: ffffc90004e4fd10 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214 #2: ffff888029d0f198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #2: ffff888029d0f198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c0/0x4fa0 drivers/usb/core/hub.c:5863 #3: ffff8880236b0198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #3: ffff8880236b0198 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2307 #4: ffff888036f6b160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline] #4: ffff888036f6b160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff888036f6b160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xa4/0x620 drivers/base/dd.c:1292 #5: ffffffff8fb826e8 (input_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:225 [inline] #5: ffffffff8fb826e8 (input_mutex){+.+.}-{4:4}, at: __input_unregister_device+0x156/0x470 drivers/input/input.c:2221 2 locks held by kworker/u8:11/7558: 4 locks held by syz.0.1296/10238: #0: ffff88807dfd4d80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481 #1: ffff88807dfd4078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ae/0x11d0 net/bluetooth/hci_sync.c:5238 #2: ffffffff905be908 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2066 [inline] #2: ffffffff905be908 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xbb/0x260 net/bluetooth/hci_conn.c:2560 #3: ffff88807d93eb38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x80/0x730 net/bluetooth/l2cap_core.c:1762 1 lock held by syz-executor/10768: 1 lock held by dhcpcd/10771: #0: ffff888057212258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff888057212258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3252 1 lock held by dhcpcd/10772: #0: ffff888023796258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff888023796258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3252 1 lock held by dhcpcd/10773: #0: ffff888025ba4258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff888025ba4258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3252 1 lock held by dhcpcd/10774: #0: ffff88805522a258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff88805522a258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3252 1 lock held by dhcpcd/10776: #0: ffff888025b76258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff888025b76258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3252 1 lock held by dhcpcd/10777: #0: ffff8880562e4258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff8880562e4258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3252 5 locks held by syz-executor/10778: 4 locks held by kworker/u9:0/10780: #0: ffff88802ad81148 ((wq_completion)hci6#2){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213 #1: ffffc9000210fd10 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214 #2: ffff888056738078 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x94/0x970 net/bluetooth/hci_event.c:3713 #3: ffffffff905be908 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline] #3: ffffffff905be908 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x472/0x970 net/bluetooth/hci_event.c:3747 1 lock held by syz-executor/10781: 4 locks held by syz-executor/10782: #0: ffffffff903371d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x286/0x5f0 net/core/net_namespace.c:570 #1: ffffffff8ff83310 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x233/0x530 drivers/infiniband/core/device.c:1178 #2: ffffffff8ff83090 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2a6/0x530 drivers/infiniband/core/device.c:1183 #3: ffff888056bdcf60 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x7d0 drivers/infiniband/core/device.c:942 4 locks held by syz-executor/10784: #0: ffffffff903371d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x286/0x5f0 net/core/net_namespace.c:570 #1: ffffffff8ff83310 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x233/0x530 drivers/infiniband/core/device.c:1178 #2: ffffffff8ff83090 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2a6/0x530 drivers/infiniband/core/device.c:1183 #3: ffff888056bdcf60 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x7d0 drivers/infiniband/core/device.c:942 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __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:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xf70/0x12c0 kernel/hung_task.c:470 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x5d4/0x6f0 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: 10787 Comm: syz-executor Not tainted 6.16.0-rc2-syzkaller-00082-gfb4d33ab452e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline] RIP: 0010:unwind_next_frame+0xba5/0x20a0 arch/x86/kernel/unwind_orc.c:585 Code: ff ff 84 c0 0f 84 fd f7 ff ff 48 8b 7c 24 18 e8 51 ea ff ff 48 89 ee 48 8b 4c 24 20 48 ba 00 00 00 00 00 fc ff df 48 c1 ee 03 <4c> 8b 44 24 28 80 3c 16 00 0f 85 29 11 00 00 48 8b 14 24 49 89 45 RSP: 0018:ffffc90003a6f520 EFLAGS: 00000a06 RAX: ffffffff821f6bab RBX: 0000000000000001 RCX: ffffffff914a44e6 RDX: dffffc0000000000 RSI: 1ffff9200074debb RDI: ffffc90003a6fbf8 RBP: ffffc90003a6f5d8 R08: ffffffff914a44ea R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000011601 R12: ffffc90003a6f5e0 R13: ffffc90003a6f590 R14: ffffc90003a6fc00 R15: ffffc90003a6f5c4 FS: 000055556da77500(0000) GS:ffff888124853000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf897b5f40 CR3: 0000000063dec000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x160/0x1f0 mm/page_owner.c:156 __set_page_owner+0x91/0x550 mm/page_owner.c:329 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419 alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline] alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2510 vm_area_alloc_pages mm/vmalloc.c:3634 [inline] __vmalloc_area_node mm/vmalloc.c:3712 [inline] __vmalloc_node_range_noprof+0x72f/0x14b0 mm/vmalloc.c:3885 vmalloc_user_noprof+0x9e/0xe0 mm/vmalloc.c:4038 kcov_ioctl+0x4c/0x730 kernel/kcov.c:716 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3410f8e52b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007ffc5214c660 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000080000 RCX: 00007f3410f8e52b RDX: 0000000000080000 RSI: ffffffff80086301 RDI: 00000000000000d8 RBP: 00007f34111b6038 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000