batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! INFO: task kworker/0:1:2985 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 kworker/0:1 D27216 2985 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:697 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:692 usb_start_wait_urb+0x252/0x4c0 drivers/usb/core/message.c:63 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152 usb_get_descriptor+0xc5/0x1b0 drivers/usb/core/message.c:654 usb_get_device_descriptor+0x81/0xf0 drivers/usb/core/message.c:926 hub_port_init+0x74b/0x3120 drivers/usb/core/hub.c:4799 hub_port_connect drivers/usb/core/hub.c:5070 [inline] hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] port_event drivers/usb/core/hub.c:5361 [inline] hub_event+0x1ccd/0x44a0 drivers/usb/core/hub.c:5441 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1571: #0: 00000000157e25a2 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7769: #0: 00000000a8e7b762 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 5 locks held by kworker/0:1/2985: #0: 00000000f0c1040e ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 #1: 000000002474bdeb ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000bf2bc1e4 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 00000000bf2bc1e4 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! #3: 00000000d88756f9 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 00000000d88756f9 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 00000000d88756f9 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 00000000d88756f9 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 00000000d88756f9 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 #4: 0000000006273dd1 (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 2 locks held by syz-executor.2/8325: batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! 2 locks held by syz-executor.5/8332: #0: 00000000d1ddfd27 (vlan_ioctl_mutex){+.+.}, at: sock_ioctl+0x385/0x5d0 net/socket.c:1111 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 #1: 0000000047303019 (rtnl_mutex){+.+.}, at: vlan_ioctl_handler+0xb7/0xf00 net/8021q/vlan.c:547 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! 2 locks held by syz-executor.5/8335: #0: 00000000f4f1109b (sk_lock-AF_PACKET){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 00000000f4f1109b (sk_lock-AF_PACKET){+.+.}, at: packet_setsockopt+0x3fc/0x2cc0 net/packet/af_packet.c:3704 #1: 000000006804443d (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #1: 000000006804443d (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! 2 locks held by syz-executor.5/8338: #0: 000000006e11b9fd (sk_lock-AF_PACKET){+.+.}, at: lock_sock include/net/sock.h:1512 [inline] #0: 000000006e11b9fd (sk_lock-AF_PACKET){+.+.}, at: packet_do_bind+0x2f/0xc10 net/packet/af_packet.c:3107 #1: 000000006804443d (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #1: 000000006804443d (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 2 locks held by syz-executor.3/8344: batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! #0: 00000000ca4cc3f1 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000ca4cc3f1 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 00000000157e25a2 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000157e25a2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 2 locks held by syz-executor.1/8350: 1 lock held by syz-executor.2/8351: batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ============================================= batman_adv: The newly added mac address (76:00:00:00:00:00) already exists on: batadv_slave_0 NMI backtrace for cpu 0 CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8355 Comm: systemd-udevd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:101 Code: 90 90 90 90 90 90 90 90 48 8b 34 24 65 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 75 2b 8b 90 60 13 00 00 <83> fa 02 75 20 48 8b 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 RSP: 0018:ffff88823ae5fad0 EFLAGS: 00000246 RAX: ffff8880591c4300 RBX: 0000000000000131 RCX: ffffffff818190b3 RDX: 0000000000000000 RSI: ffffffff818198e2 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffea0000214800 R13: ffffea0000214880 R14: 0000000000000011 R15: dffffc0000000000 FS: 00007f43d576d8c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e28d2348e0 CR3: 00000000b00a4000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: release_pages+0xa12/0x15a0 mm/swap.c:727 tlb_flush_mmu_free mm/memory.c:261 [inline] tlb_flush_mmu+0x1dc/0x4f0 mm/memory.c:270 arch_tlb_finish_mmu mm/memory.c:285 [inline] tlb_finish_mmu+0x108/0x200 mm/memory.c:444 exit_mmap+0x2d9/0x530 mm/mmap.c:3095 __mmput kernel/fork.c:1016 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1037 exit_mm kernel/exit.c:549 [inline] do_exit+0xaec/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 __do_sys_exit_group kernel/exit.c:978 [inline] __se_sys_exit_group kernel/exit.c:976 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f43d45bc618 Code: Bad RIP value. RSP: 002b:00007ffdba71cee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007ffdba71cfb0 RCX: 00007f43d45bc618 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00007ffdba71d060 R08: 00000000000000e7 R09: fffffffffffffe50 R10: 00000000ffffffff R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000003 R15: 000000000000000e batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 48 8b 34 24 mov (%rsp),%rsi c: 65 48 8b 04 25 c0 df mov %gs:0x1dfc0,%rax 13: 01 00 15: 65 8b 15 cc 59 9f 7e mov %gs:0x7e9f59cc(%rip),%edx # 0x7e9f59e8 1c: 81 e2 00 01 1f 00 and $0x1f0100,%edx 22: 75 2b jne 0x4f 24: 8b 90 60 13 00 00 mov 0x1360(%rax),%edx * 2a: 83 fa 02 cmp $0x2,%edx <-- trapping instruction 2d: 75 20 jne 0x4f 2f: 48 8b 88 68 13 00 00 mov 0x1368(%rax),%rcx 36: 8b 80 64 13 00 00 mov 0x1364(%rax),%eax 3c: 48 8b 11 mov (%rcx),%rdx 3f: 48 rex.W