wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) wlan1: No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge) INFO: task syz-executor.4:17520 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.4 D24192 17520 1 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 btrfs_tree_lock+0x4fe/0x810 fs/btrfs/locking.c:233 btrfs_init_new_buffer fs/btrfs/extent-tree.c:8145 [inline] btrfs_alloc_tree_block+0x9b1/0x15f0 fs/btrfs/extent-tree.c:8284 alloc_tree_block_no_bg_flush+0x1b6/0x250 fs/btrfs/ctree.c:1039 __btrfs_cow_block+0x3c7/0x10a0 fs/btrfs/ctree.c:1094 btrfs_cow_block+0x276/0x840 fs/btrfs/ctree.c:1557 btrfs_search_slot+0x66a/0x1ee0 fs/btrfs/ctree.c:2881 btrfs_update_root+0xc9/0x6b0 fs/btrfs/root-tree.c:134 commit_fs_roots+0x3b5/0x530 fs/btrfs/transaction.c:1286 btrfs_commit_transaction+0x8ca/0x2480 fs/btrfs/transaction.c:2178 btrfs_sync_fs+0x120/0x490 fs/btrfs/super.c:1279 __sync_filesystem fs/sync.c:39 [inline] sync_filesystem+0x1b5/0x250 fs/sync.c:67 generic_shutdown_super+0x70/0x370 fs/super.c:442 kill_anon_super+0x36/0x60 fs/super.c:1032 btrfs_kill_super+0x49/0x550 fs/btrfs/super.c:2221 deactivate_locked_super+0x94/0x160 fs/super.c:329 deactivate_super+0x174/0x1a0 fs/super.c:360 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f056ffd5517 Code: Bad RIP value. RSP: 002b:00007ffe4179a208 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f056ffd5517 RDX: 00007ffe4179a2db RSI: 000000000000000a RDI: 00007ffe4179a2d0 RBP: 00007ffe4179a2d0 R08: 00000000ffffffff R09: 00007ffe4179a0a0 R10: 0000555555f27903 R11: 0000000000000246 R12: 00007f057002eb24 R13: 00007ffe4179b390 R14: 0000555555f27810 R15: 00007ffe4179b3d0 Showing all locks held in the system: 3 locks held by kworker/u4:3/58: #0: 000000009061fc94 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9702 [inline] #0: 000000009061fc94 (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 kernel/sched/fair.c:6841 #1: 000000009061fc94 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #1: 000000009061fc94 (&rq->lock){-.-.}, at: attach_tasks kernel/sched/fair.c:7432 [inline] #1: 000000009061fc94 (&rq->lock){-.-.}, at: load_balance+0xa88/0x2080 kernel/sched/fair.c:8749 #2: 00000000e795ac57 (rcu_read_lock){....}, at: batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:417 [inline] #2: 00000000e795ac57 (rcu_read_lock){....}, at: batadv_nc_worker+0xf3/0xd50 net/batman-adv/network-coding.c:730 1 lock held by khungtaskd/1571: #0: 00000000e795ac57 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7829: #0: 0000000058b2383c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 3 locks held by syz-executor.4/17520: #0: 00000000c8e02888 (&type->s_umount_key#55){++++}, at: deactivate_super+0x16c/0x1a0 fs/super.c:359 #1: 000000003e8b41cf (&fs_info->reloc_mutex){+.+.}, at: btrfs_commit_transaction+0x80b/0x2480 fs/btrfs/transaction.c:2120 #2: 00000000ffb01326 (&fs_info->tree_log_mutex){+.+.}, at: btrfs_commit_transaction+0x8c2/0x2480 fs/btrfs/transaction.c:2176 1 lock held by btrfs-transacti/18384: #0: 000000007d05f5ed (&fs_info->transaction_kthread_mutex){+.+.}, at: transaction_kthread+0xfa/0x490 fs/btrfs/disk-io.c:1765 ============================================= 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 10/26/2022 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:preempt_count_add+0x9f/0x190 kernel/sched/core.c:3242 Code: 15 c6 c8 e2 0b 85 d2 75 11 65 8b 05 ab 70 c0 7e 0f b6 c0 3d f4 00 00 00 7f 64 65 8b 05 9a 70 c0 7e 25 ff ff ff 7f 39 c5 74 03 <5b> 5d c3 48 8b 5c 24 10 48 89 df e8 41 15 0a 00 85 c0 75 35 65 48 RSP: 0018:ffff8880b5a67a50 EFLAGS: 00000097 RAX: 0000000000000002 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000086 R13: 1ffff11016b4cf52 R14: ffff8880b5a67cc0 R15: ffffffff8d3b9088 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f95cd075000 CR3: 00000000a1374000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:109 [inline] _raw_spin_lock_irqsave+0x70/0xc0 kernel/locking/spinlock.c:152 debug_object_deactivate lib/debugobjects.c:540 [inline] debug_object_deactivate+0xfc/0x2e0 lib/debugobjects.c:529 debug_timer_deactivate kernel/time/timer.c:723 [inline] debug_deactivate kernel/time/timer.c:779 [inline] detach_timer kernel/time/timer.c:824 [inline] detach_if_pending+0x82/0x460 kernel/time/timer.c:843 try_to_del_timer_sync+0xaa/0x110 kernel/time/timer.c:1240 del_timer_sync+0x1a4/0x270 kernel/time/timer.c:1305 schedule_timeout+0x4d7/0xfe0 kernel/time/timer.c:1819 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415