overlayfs: failed to resolve './bus': -2 INFO: task syz-executor.3:18047 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27968 18047 8128 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 usb_start_wait_urb+0x14b/0x4c0 drivers/usb/core/message.c:62 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:253 proc_bulk+0x3de/0x860 drivers/usb/core/devio.c:1211 usbdev_do_ioctl+0x696/0x3030 drivers/usb/core/devio.c:2435 netlink: 36 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 32 bytes leftover after parsing attributes in process `syz-executor.0'. usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2585 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f57677315a9 Code: Bad RIP value. RSP: 002b:00007f57660a5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5767852f80 RCX: 00007f57677315a9 RDX: 00000000200002c0 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00007f576778c580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffbb22ac5f R14: 00007f57660a5300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000004035bf8b (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 2 locks held by kworker/1:2/4384: #0: 00000000d76bb41d ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000d3a1be56 ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 1 lock held by in:imklog/7805: #0: 000000009cedf7b2 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by syz-executor.5/8126: 4 locks held by syz-executor.2/26879: #0: 0000000061684878 (&tty->legacy_mutex){+.+.}, at: tty_lock+0x6a/0xa0 drivers/tty/tty_mutex.c:19 #1: 00000000d3faabe3 (&tty->ldisc_sem){++++}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:320 [inline] #1: 00000000d3faabe3 (&tty->ldisc_sem){++++}, at: tty_ldisc_lock+0x4d/0x90 drivers/tty/tty_ldisc.c:344 #2: 00000000c657d340 (rtnl_mutex){+.+.}, at: unregister_netdev+0xe/0x20 net/core/dev.c:9345 #3: 00000000589c499f (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #3: 00000000589c499f (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667 1 lock held by syz-executor.2/26898: #0: 0000000061684878 (&tty->legacy_mutex){+.+.}, at: tty_lock+0x6a/0xa0 drivers/tty/tty_mutex.c:19 1 lock held by syz-executor.3/26901: #0: 00000000a2adce2b (acct_on_mutex){+.+.}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: 00000000a2adce2b (acct_on_mutex){+.+.}, at: __se_sys_acct+0x8c/0x930 kernel/acct.c:273 1 lock held by syz-executor.3/26909: #0: 00000000a2adce2b (acct_on_mutex){+.+.}, at: __do_sys_acct kernel/acct.c:285 [inline] #0: 00000000a2adce2b (acct_on_mutex){+.+.}, at: __se_sys_acct+0x8c/0x930 kernel/acct.c:273 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10359 Comm: kworker/u4:10 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:577 [inline] RIP: 0010:batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:606 [inline] RIP: 0010:batadv_iv_send_outstanding_bat_ogm_packet+0x5d9/0x7a0 net/batman-adv/bat_iv_ogm.c:1859 Code: 80 3c 02 00 0f 85 bf 01 00 00 48 8b 44 24 08 49 8d bc 24 80 00 00 00 48 89 fa 48 c1 ea 03 48 8b 80 10 0b 00 00 65 48 ff 40 38 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 02 84 c0 74 09 3c 03 7f 05 RSP: 0018:ffff8880517dfcc8 EFLAGS: 00000206 RAX: 0000607f45c7e828 RBX: ffff8880af68e188 RCX: ffffffff866ff93e RDX: 1ffff11015623190 RSI: ffffffff87d52832 RDI: ffff8880ab118c80 RBP: ffff88809a861780 R08: 0000000000000001 R09: ffffed1009d65214 R10: ffff88804eb290a3 R11: 0000000044923c78 R12: ffff8880ab118c00 R13: ffff888093a836c0 R14: ffff8880af68e140 R15: ffff88809aa9ce80 FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa9354ca028 CR3: 00000000a345b000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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