INFO: task syz-executor:6491 blocked for more than 153 seconds. Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6491 tgid:6491 ppid:1 task_flags:0x40054c flags:0x00000019 Call trace: __switch_to+0x414/0x834 arch/arm64/kernel/process.c:735 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x13b0/0x28d4 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6860 wait_current_trans+0x2d0/0x468 fs/btrfs/transaction.c:532 start_transaction+0x798/0x1558 fs/btrfs/transaction.c:707 btrfs_attach_transaction_barrier+0x30/0xac fs/btrfs/transaction.c:883 btrfs_sync_fs+0x148/0x9a0 fs/btrfs/super.c:1018 sync_filesystem+0x1a0/0x218 fs/sync.c:66 generic_shutdown_super+0x70/0x2b8 fs/super.c:621 kill_anon_super+0x4c/0x7c fs/super.c:1237 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2103 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1431 __cleanup_mnt+0x20/0x30 fs/namespace.c:1438 task_work_run+0x1dc/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x4e8/0x1998 kernel/exit.c:953 do_group_exit+0x194/0x22c kernel/exit.c:1102 get_signal+0x11dc/0x12f8 kernel/signal.c:3034 do_signal+0x274/0x4438 arch/arm64/kernel/signal.c:1615 do_notify_resume+0xac/0x1ec arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xb4/0x17c arch/arm64/kernel/entry-common.c:768 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by kthreadd/2: 2 locks held by kworker/0:0/9: 4 locks held by kworker/0:1/11: #0: ffff0000c0028d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff800097647bc0 (reg_work){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #3: ffff0000f28d0768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6092 [inline] #3: ffff0000f28d0768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: reg_process_self_managed_hints+0xc4/0x1c0 net/wireless/reg.c:3209 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/13: 1 lock held by khungtaskd/32: #0: ffff80008f508920 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u8:2/43: 4 locks held by kworker/u8:3/45: 3 locks held by kworker/u8:4/219: 3 locks held by kworker/u8:5/282: 3 locks held by kworker/u8:6/339: 3 locks held by kworker/u8:7/703: 3 locks held by kworker/u8:8/762: #0: ffff0000c0031948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff80009d147bc0 ((crda_timeout).work ){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:9/800: 3 locks held by kworker/R-ipv6_/4141: #0: ffff0000d2552948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff8000a0c17ba0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0 #1: ffff8000a0c17ba0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by kworker/R-bat_e/4222: 7 locks held by kworker/u8:10/4434: 1 lock held by klogd/6095: 1 lock held by dhcpcd/6160: 2 locks held by dhcpcd/6161: 2 locks held by getty/6253: #0: ffff0000cd5c70a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b5fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa0 drivers/tty/n_tty.c:2222 2 locks held by kworker/0:3/6481: 1 lock held by udevd/6482: 2 locks held by udevd/6484: 1 lock held by syz-executor/6491: #0: ffff0000ef1fa0e0 (&type->s_umount_key#74){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff0000ef1fa0e0 (&type->s_umount_key#74){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff0000ef1fa0e0 (&type->s_umount_key#74){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505 4 locks held by kworker/0:4/6501: 2 locks held by kworker/0:5/6503: 4 locks held by kworker/1:3/6538: 2 locks held by kworker/0:6/6540: 2 locks held by kworker/0:7/6565: 2 locks held by udevd/6643: 7 locks held by btrfs-transacti/6952: 3 locks held by kworker/u8:11/6958: #0: ffff0000c0031948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff8000a0a77bc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 4 locks held by kworker/u8:12/6960: 4 locks held by kworker/u8:13/6961: 3 locks held by kworker/u8:14/6962: 3 locks held by syz-executor/6964: =============================================