INFO: task udevd:6435 blocked for more than 143 seconds. Not tainted 6.14.0-rc3-syzkaller-ge6747d19291c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:6435 tgid:6435 ppid:6058 task_flags:0x400140 flags:0x0000000c Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5378 [inline] __schedule+0x1360/0x257c kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6857 schedule_timeout+0x164/0x290 kernel/time/sleep_timeout.c:99 wait_for_reconnect drivers/block/nbd.c:1104 [inline] nbd_handle_cmd drivers/block/nbd.c:1146 [inline] nbd_queue_rq+0x548/0xce4 drivers/block/nbd.c:1204 blk_mq_dispatch_rq_list+0x408/0x15d8 block/blk-mq.c:2120 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:170 [inline] blk_mq_do_dispatch_sched block/blk-mq-sched.c:184 [inline] __blk_mq_sched_dispatch_requests+0x8d8/0x12b4 block/blk-mq-sched.c:309 blk_mq_sched_dispatch_requests+0xa4/0x154 block/blk-mq-sched.c:331 blk_mq_run_hw_queue+0x2e0/0x4a4 block/blk-mq.c:2354 blk_mq_flush_plug_list+0x11c8/0x13ac block/blk-mq.c:2917 __blk_flush_plug+0x388/0x460 block/blk-core.c:1213 blk_finish_plug block/blk-core.c:1240 [inline] __submit_bio+0x49c/0x5dc block/blk-core.c:642 __submit_bio_noacct_mq block/blk-core.c:715 [inline] submit_bio_noacct_nocheck+0x3bc/0xcbc block/blk-core.c:744 submit_bio_noacct+0xc80/0x17cc block/blk-core.c:867 submit_bio+0x374/0x564 block/blk-core.c:909 submit_bh_wbc+0x3f8/0x4c8 fs/buffer.c:2814 submit_bh fs/buffer.c:2819 [inline] block_read_full_folio+0x7ac/0x914 fs/buffer.c:2446 blkdev_read_folio+0x28/0x38 block/fops.c:467 filemap_read_folio+0x108/0x318 mm/filemap.c:2390 do_read_cache_folio+0x368/0x5c0 mm/filemap.c:3960 read_cache_folio+0x68/0x84 mm/filemap.c:3992 read_mapping_folio include/linux/pagemap.h:1023 [inline] read_part_sector+0xcc/0x714 block/partitions/core.c:722 adfspart_check_ICS+0xb8/0x89c block/partitions/acorn.c:360 check_partition block/partitions/core.c:141 [inline] blk_add_partitions block/partitions/core.c:589 [inline] bdev_disk_changed+0x6ac/0x1208 block/partitions/core.c:693 blkdev_get_whole+0x21c/0x418 block/bdev.c:706 bdev_open+0x378/0xbd0 block/bdev.c:915 blkdev_open+0x2fc/0x43c block/fops.c:652 do_dentry_open+0xb7c/0x1538 fs/open.c:956 vfs_open+0x48/0x2d8 fs/open.c:1086 do_open fs/namei.c:3830 [inline] path_openat+0x2308/0x2b1c fs/namei.c:3989 do_filp_open+0x1e8/0x404 fs/namei.c:4016 do_sys_openat2+0x124/0x1b8 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff80008fda2220 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 3 locks held by kworker/u8:6/579: #0: ffff0000d270a948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3210 #1: ffff80009c757ba0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3210 #2: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 3 locks held by kworker/u8:8/4295: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3210 #1: ffff8000a2aa7ba0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3210 #2: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by kworker/u8:9/4370: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3210 #1: ffff8000a1f97ba0 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3210 1 lock held by dhcpcd/6112: #0: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by getty/6196: #0: ffff0000d277a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009bccb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 3 locks held by udevd/6435: #0: ffff0000ca5f74c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xd0/0xbd0 block/bdev.c:903 #1: ffff0000c466a990 (set->srcu){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:163 #2: ffff0000ca7351f8 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xb8/0xce4 drivers/block/nbd.c:1196 1 lock held by udevd/6544: #0: ffff0000ca6eb4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xd0/0xbd0 block/bdev.c:903 6 locks held by kworker/u8:11/7299: #0: ffff0000c1899948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x674/0x1638 kernel/workqueue.c:3210 #1: ffff80009ece7ba0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x708/0x1638 kernel/workqueue.c:3210 #2: ffff800092b64a50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x148/0xa48 net/core/net_namespace.c:606 #3: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 #4: ffff0000cd5b0e00 (team->team_lock_key#15){+.+.}-{4:4}, at: team_del_slave+0x38/0x1a8 drivers/net/team/team_core.c:2002 #5: ffff80008fda7738 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:302 [inline] #5: ffff80008fda7738 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x354/0x674 kernel/rcu/tree_exp.h:996 1 lock held by syz-executor/8892: #0: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:335 [inline] #0: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xaf8/0x1844 net/core/rtnetlink.c:4021 1 lock held by syz-executor/8940: #0: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 7 locks held by syz-executor/8990: #0: ffff0000d8200420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3035 [inline] #0: ffff0000d8200420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x248/0xa9c fs/read_write.c:675 #1: ffff0000cf03fc88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000c5a0aa58 (kn->active#44){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff800091cb6688 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xec/0x39c drivers/net/netdevsim/bus.c:216 #4: ffff0000ee7020e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline] #4: ffff0000ee7020e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff0000ee7020e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xbc/0x698 drivers/base/dd.c:1293 #5: ffff0000c1f46250 (&devlink->lock_key#10){+.+.}-{4:4}, at: devl_lock+0x24/0x34 net/devlink/core.c:276 #6: ffff800092b71168 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 4 locks held by syz-executor/8993: #0: ffff0000d8200420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3035 [inline] #0: ffff0000d8200420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x248/0xa9c fs/read_write.c:675 #1: ffff0000e7a1a088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000c5a0aa58 (kn->active#44){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff800091cb6688 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xec/0x39c drivers/net/netdevsim/bus.c:216 4 locks held by syz-executor/9069: #0: ffff0000d8200420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3035 [inline] #0: ffff0000d8200420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x248/0xa9c fs/read_write.c:675 #1: ffff0000c782f088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000c5a0aa58 (kn->active#44){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff800091cb6688 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xec/0x39c drivers/net/netdevsim/bus.c:216 =============================================