INFO: task syz-fuzzer:7984 blocked for more than 140 seconds. Not tainted 4.14.302-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-fuzzer D27400 7984 7975 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1126 RIP: e87000:0xc0000824e0 RSP: e7ec90:000000c0000abe70 EFLAGS: 00000002 INFO: task syz-fuzzer:7994 blocked for more than 140 seconds. Not tainted 4.14.302-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-fuzzer D29056 7994 7975 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:66 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1126 RIP: fc1c00:0xc000083ba0 RSP: 17d30b0:000000c000d17e70 EFLAGS: 00000010 INFO: task syz-executor.1:11322 blocked for more than 140 seconds. Not tainted 4.14.302-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D26744 11322 8002 0x80000006 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 device_del+0x642/0xa80 drivers/base/core.c:2097 hci_conn_del_sysfs+0xca/0x160 net/bluetooth/hci_sysfs.c:81 hci_conn_cleanup+0x216/0x500 net/bluetooth/hci_conn.c:128 hci_conn_del+0x253/0x6f0 net/bluetooth/hci_conn.c:611 hci_conn_hash_flush+0x19c/0x260 net/bluetooth/hci_conn.c:1394 hci_dev_do_close+0x57d/0xd80 net/bluetooth/hci_core.c:1641 hci_unregister_dev+0x143/0x420 net/bluetooth/hci_core.c:3209 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:354 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa44/0x2850 kernel/exit.c:868 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f649ef2a0d9 RSP: 002b:00007f649d49c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: 0000000000000007 RBX: 00007f649f049f80 RCX: 00007f649ef2a0d9 RDX: 0000000000000000 RSI: 0000000000141042 RDI: 0000000020000100 RBP: 00007f649ef85ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffff14f35cf R14: 00007f649d49c300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7692: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:819 1 lock held by syz-fuzzer/7984: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378 1 lock held by syz-fuzzer/7994: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378 3 locks held by syz-executor.4/11304: #0: (&hdev->req_lock){+.+.}, at: [] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589 #1: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 #2: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 3 locks held by syz-executor.1/11322: #0: (&hdev->req_lock){+.+.}, at: [] hci_dev_do_close+0xa8/0xd80 net/bluetooth/hci_core.c:1589 #1: (&hdev->lock){+.+.}, at: [] hci_dev_do_close+0x264/0xd80 net/bluetooth/hci_core.c:1628 #2: (uevent_sock_mutex){+.+.}, at: [] kobject_uevent_env+0x755/0xf30 lib/kobject_uevent.c:460 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: bat_events batadv_nc_worker task: ffff8880b5fec140 task.stack: ffff8880b5ff8000 RIP: 0010:skb_release_head_state+0x0/0x250 net/core/skbuff.c:620 RSP: 0018:ffff8880ba507bb8 EFLAGS: 00000206 RAX: ffff8880b5fec140 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000100 RSI: 00000000ffffffff RDI: ffff8881fb19ae40 RBP: ffff8881fb19ae40 R08: ffffffff8b9d8c10 R09: 00000000000426c1 R10: ffff8880b5feca40 R11: ffff8880b5fec140 R12: ffff8881fb19ba48 R13: 0000000000000005 R14: 0000000000000000 R15: ffff8881fb19aed0 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a8e0f5a268 CR3: 00000000ab8c0000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_release_all net/core/skbuff.c:638 [inline] __kfree_skb net/core/skbuff.c:654 [inline] consume_skb+0xa7/0x380 net/core/skbuff.c:714 vcan_tx+0x461/0x940 drivers/net/can/vcan.c:113 __netdev_start_xmit include/linux/netdevice.h:4054 [inline] netdev_start_xmit include/linux/netdevice.h:4063 [inline] xmit_one net/core/dev.c:3005 [inline] dev_hard_start_xmit+0x188/0x890 net/core/dev.c:3021 __dev_queue_xmit+0x1d7f/0x2480 net/core/dev.c:3521 can_send+0x3b4/0x7c0 net/can/af_can.c:297 bcm_can_tx+0x475/0x690 net/can/bcm.c:314 bcm_tx_timeout_tsklet+0x179/0x320 net/can/bcm.c:428 tasklet_action+0x195/0x340 kernel/softirq.c:513 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1019 do_softirq.part.0+0x154/0x1b0 kernel/softirq.c:332 do_softirq kernel/softirq.c:324 [inline] __local_bh_enable_ip+0x12b/0x170 kernel/softirq.c:185 spin_unlock_bh include/linux/spinlock.h:362 [inline] batadv_nc_purge_paths+0x20c/0x300 net/batman-adv/network-coding.c:481 batadv_nc_worker+0x660/0xc50 net/batman-adv/network-coding.c:731 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Code: ff ff 48 89 04 24 e8 b0 73 bf fb 48 8b 04 24 e9 9e fe ff ff 4c 89 ef e8 7f 74 bf fb eb 83 e8 c8 71 bf fb e9 0a ff ff ff 0f 1f 00 <41> 54 55 53 48 89 fb e8 84 b2 95 fb 4c 8d 63 58 48 b8 00 00 00