IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready Bluetooth: hci8 command 0x0419 tx timeout Bluetooth: hci10 command 0x0419 tx timeout Bluetooth: hci9 command 0x0419 tx timeout INFO: task syz-executor.2:10634 blocked for more than 140 seconds. Not tainted 4.14.291-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D30296 10634 7994 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 __get_super.part.0+0x271/0x390 fs/super.c:678 __get_super include/linux/spinlock.h:317 [inline] get_super+0x2b/0x50 fs/super.c:707 fsync_bdev+0x14/0xc0 fs/block_dev.c:495 blkdev_flushbuf block/ioctl.c:430 [inline] blkdev_ioctl+0x883/0x1830 block/ioctl.c:514 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f2b515c5279 RSP: 002b:00007f2b4ff19168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f2b516d8050 RCX: 00007f2b515c5279 RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000005 RBP: 00007f2b5161f2e9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff96de57df R14: 00007f2b4ff19300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1535: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by agetty/7924: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.2/10634: #0: (&type->s_umount_key#55){.+.+}, at: [] __get_super.part.0+0x271/0x390 fs/super.c:678 1 lock held by syz-executor.5/12925: #0: (&type->s_umount_key#55){.+.+}, at: [] iterate_supers+0xda/0x490 fs/super.c:611 1 lock held by syz-executor.4/13039: #0: (&type->s_umount_key#55){.+.+}, at: [] iterate_supers+0xda/0x490 fs/super.c:611 1 lock held by syz-executor.3/13040: #0: (&type->s_umount_key#55){.+.+}, at: [] iterate_supers+0xda/0x490 fs/super.c:611 1 lock held by syz-executor.5/13288: #0: (&type->s_umount_key#55){.+.+}, at: [] iterate_supers+0xda/0x490 fs/super.c:611 1 lock held by syz-executor.3/13997: #0: (&type->s_umount_key#55){.+.+}, at: [] iterate_supers+0xda/0x490 fs/super.c:611 1 lock held by syz-executor.5/14043: #0: (&type->s_umount_key#55){.+.+}, at: [] iterate_supers+0xda/0x490 fs/super.c:611 1 lock held by syz-executor.4/14045: #0: (&type->s_umount_key#55){.+.+}, at: [] iterate_supers+0xda/0x490 fs/super.c:611 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1535 Comm: khungtaskd Not tainted 4.14.291-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9397 Comm: kworker/u4:6 Not tainted 4.14.291-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Workqueue: bat_events batadv_nc_worker task: ffff8880695c22c0 task.stack: ffff888069600000 RIP: 0010:debug_lockdep_rcu_enabled+0x0/0xe0 kernel/rcu/update.c:299 RSP: 0018:ffff888069607cd0 EFLAGS: 00000297 RAX: ffff8880695c22c0 RBX: ffff88806a9a2608 RCX: 1ffffffff11991ad RDX: 0000000000000000 RSI: ffffffff87cd0540 RDI: ffff8880ba52ca8c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020011 R10: ffff8880695c2b98 R11: ffff8880695c22c0 R12: dffffc0000000000 R13: ffff8880a8b8d300 R14: ffff88813fe468c0 R15: ffff8880a4f05c00 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efc5819e000 CR3: 00000000a17bc000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock include/linux/rcupdate.h:681 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:422 [inline] batadv_nc_worker+0x56a/0xc50 net/batman-adv/network-coding.c:728 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:404 Code: fe ff ff 4c 89 f7 e8 50 de 38 00 e9 0c ff ff ff 48 89 34 24 e8 42 de 38 00 48 8b 34 24 e9 b9 fe ff ff 66 0f 1f 84 00 00 00 00 00 <48> c7 c0 84 26 09 8a 53 48 ba 00 00 00 00 00 fc ff df 48 89 c1