INFO: task kworker/0:0:9 blocked for more than 149 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:0 pid:9 tgid:9 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: events update_super_work Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x13b0/0x2864 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xb4/0x230 kernel/sched/core.c:7026 io_schedule+0x84/0xf0 kernel/sched/core.c:7871 bit_wait_io+0x1c/0xac kernel/sched/wait_bit.c:250 __wait_on_bit kernel/sched/wait_bit.c:52 [inline] out_of_line_wait_on_bit+0x158/0x1f0 kernel/sched/wait_bit.c:67 wait_on_bit_io include/linux/wait_bit.h:105 [inline] __wait_on_buffer+0x6c/0x7c fs/buffer.c:123 wait_on_buffer include/linux/buffer_head.h:420 [inline] ext4_commit_super+0x300/0x4e4 fs/ext4/super.c:6236 update_super_work+0x2dc/0x394 fs/ext4/super.c:799 process_one_work+0x7e8/0x155c kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3427 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 INFO: task kworker/R-ipv6_:4234 blocked for more than 149 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/R-ipv6_ state:D stack:0 pid:4234 tgid:4234 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: ipv6_addrconf addrconf_dad_work Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x13b0/0x2864 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xb4/0x230 kernel/sched/core.c:7026 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7083 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:676 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 rtnl_net_lock include/linux/rtnetlink.h:130 [inline] addrconf_dad_work+0x100/0x10cc net/ipv6/addrconf.c:4194 process_one_work+0x7e8/0x155c kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] rescuer_thread+0x504/0xec8 kernel/workqueue.c:3523 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Showing all locks held in the system: 1 lock held by kthreadd/2: 2 locks held by kworker/0:0/9: #0: ffff0000c0029948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff800097a47be0 ((work_completion)(&sbi->s_sb_upd_work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 2 locks held by kworker/0:1/11: 3 locks held by kworker/u8:0/12: 3 locks held by kworker/u8:1/15: 3 locks held by kworker/1:0/24: #0: ffff0000c0029948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff800097b47be0 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff800092877b28 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by khungtaskd/32: #0: ffff80008f78b760 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 10 locks held by kworker/R-write/34: 3 locks held by kworker/u8:2/41: 3 locks held by kworker/u8:3/42: 1 lock held by pr/ttyAMA-1/43: 5 locks held by kworker/u9:0/53: #0: ffff0000cb544148 ((wq_completion)hci0){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000991e7be0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000cb634dc8 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x184/0x33c net/bluetooth/hci_sync.c:331 #3: ffff0000cb6340b8 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x1d4/0xbb8 net/bluetooth/hci_sync.c:5684 #4: ffff800092be4248 (uevent_sock_mutex){+.+.}-{4:4}, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline] #4: ffff800092be4248 (uevent_sock_mutex){+.+.}-{4:4}, at: kobject_uevent_net_broadcast+0x24c/0x548 lib/kobject_uevent.c:410 3 locks held by kworker/u8:4/519: 3 locks held by kworker/u8:5/800: 2 locks held by kworker/0:2/1857: 3 locks held by kworker/u8:6/2110: 3 locks held by kworker/R-ipv6_/4234: #0: ffff0000d2d11948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000a2627bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff800092877b28 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by kworker/R-bat_e/4310: 3 locks held by kworker/u8:7/5178: 1 lock held by klogd/6180: 1 lock held by udevd/6191: 1 lock held by dhcpcd/6245: 3 locks held by dhcpcd/6246: 2 locks held by crond/6320: 2 locks held by getty/6335: #0: ffff0000d34a90a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009bb3b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222 1 lock held by syz-executor/6535: 2 locks held by udevd/6541: 2 locks held by syz-executor/6550: 1 lock held by syz-executor/6556: #0: ffff800092877b28 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by syz-executor/6557: #0: ffff800092877b28 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffff800092877b28 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x5dc/0x97c net/core/rtnetlink.c:6957 2 locks held by kworker/0:4/6655: 2 locks held by kworker/1:7/6664: 1 lock held by syz.0.1/6674: #0: ffff0000d101a0e0 (&type->s_umount_key#51){+.+.}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff0000d101a0e0 (&type->s_umount_key#51){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff0000d101a0e0 (&type->s_umount_key#51){+.+.}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505 1 lock held by udevd/6675: #0: ffff0000c1466f38 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline] #0: ffff0000c1466f38 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: blkdev_read_iter+0x2a0/0x3dc block/fops.c:858 2 locks held by udevadm/6688: 4 locks held by syz.3.4/6699: #0: ffff8000928dd0d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1218 #1: ffff8000928dcee8 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff8000928dcee8 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff8000928dcee8 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xf4/0x624 net/netlink/genetlink.c:1209 #2: ffff800092877b28 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 #3: ffff0000c8821528 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_set_device+0x158/0x19d0 drivers/net/wireguard/netlink.c:515 3 locks held by ext4lazyinit/6709: #0: ffff0000d60800e0 (&type->s_umount_key#30){++++}-{4:4}, at: ext4_lazyinit_thread+0x184/0x1744 fs/ext4/super.c:3815 #1: ffff0000d6080420 (sb_writers#3){.+.+}-{0:0}, at: kthread+0x5fc/0x75c kernel/kthread.c:463 #2: ffff0000c173d0a8 (&meta_group_info[i]->alloc_sem){++++}-{4:4}, at: ext4_init_inode_table+0x180/0x780 fs/ext4/ialloc.c:1541 2 locks held by kworker/0:6/6718: 3 locks held by kworker/u8:8/6719: 2 locks held by kworker/u8:9/6720: 3 locks held by kworker/u8:10/6722: 1 lock held by kworker/u8:11/6724: =============================================