INFO: task syz-executor:6443 blocked for more than 143 seconds. Not tainted 6.13.0-rc7-syzkaller-g1950a0af2d55 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6443 tgid:6443 ppid:1 flags:0x00000009 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1744/0x27f0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6848 wb_wait_for_completion+0x154/0x29c fs/fs-writeback.c:216 __writeback_inodes_sb_nr+0x244/0x2d8 fs/fs-writeback.c:2735 writeback_inodes_sb_nr fs/fs-writeback.c:2752 [inline] writeback_inodes_sb+0x7c/0x90 fs/fs-writeback.c:2767 sync_filesystem+0xa0/0x218 fs/sync.c:54 generic_shutdown_super+0x70/0x2bc fs/super.c:621 bch2_kill_sb+0x40/0x58 fs/bcachefs/fs.c:2278 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1373 __cleanup_mnt+0x20/0x30 fs/namespace.c:1380 task_work_run+0x230/0x2e0 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 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+0xac/0x168 arch/arm64/kernel/entry-common.c:745 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: 3 locks held by kworker/u8:0/11: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3210 #1: ffff800097b27c20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3210 #2: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 4 locks held by ksoftirqd/1/24: 3 locks held by kworker/1:1/27: 1 lock held by khungtaskd/31: #0: ffff80008fbf3160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 2 locks held by kworker/u8:4/149: #0: ffff0000c20ee948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3210 #1: ffff80009bab7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3210 7 locks held by kworker/u8:11/4689: #0: ffff0000c1899948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3210 #1: ffff8000a1f17c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3210 #2: ffff800092969850 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x13c/0xa34 net/core/net_namespace.c:602 #3: ffff0000ee0c70e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #3: ffff0000ee0c70e8 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline] #3: ffff0000ee0c70e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x114/0x418 net/devlink/core.c:506 #4: ffff0000effd8250 (&devlink->lock_key#7){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:276 [inline] #4: ffff0000effd8250 (&devlink->lock_key#7){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline] #4: ffff0000effd8250 (&devlink->lock_key#7){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x124/0x418 net/devlink/core.c:506 #5: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 #6: ffff80008fa8fc10 (cpu_hotplug_lock){++++}-{0:0}, at: flush_all_backlogs net/core/dev.c:6063 [inline] #6: ffff80008fa8fc10 (cpu_hotplug_lock){++++}-{0:0}, at: unregister_netdevice_many_notify+0x518/0x1c6c net/core/dev.c:11526 1 lock held by klogd/6044: 1 lock held by dhcpcd/6109: #0: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x5e8/0xa9c net/core/rtnetlink.c:6928 2 locks held by getty/6198: #0: ffff0000d27830a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009bacb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/6443: #0: ffff0000da7f60e0 (&type->s_umount_key#58){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff0000da7f60e0 (&type->s_umount_key#58){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff0000da7f60e0 (&type->s_umount_key#58){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505 4 locks held by bch-reclaim/loo/6605: #0: ffff0000f1f4b0a8 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x144/0x4b8 fs/bcachefs/journal_reclaim.c:739 #1: ffff0000f1f04398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:157 #2: ffff0000f1f04740 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x10fc/0x1254 fs/bcachefs/btree_write_buffer.c:516 #3: ffff0000f1f266d0 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x588/0x15ac fs/bcachefs/btree_update_interior.c:1197 1 lock held by syz.3.185/7412: #0: ffff0000da7f60e0 (&type->s_umount_key#58){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000da7f60e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.2.262/8028: #0: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 7 locks held by syz-executor/8209: #0: ffff0000d81c4420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #0: ffff0000d81c4420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x354/0xcf4 fs/read_write.c:675 #1: ffff0000c9c08088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000c9b0e008 (kn->active#44){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff800091ac74c8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xec/0x39c drivers/net/netdevsim/bus.c:216 #4: ffff0000efab40e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff0000efab40e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff0000efab40e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xbc/0x698 drivers/base/dd.c:1293 #5: ffff0000efab5250 (&devlink->lock_key#4){+.+.}-{4:4}, at: devl_lock+0x24/0x34 net/devlink/core.c:276 #6: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz.9.269/8239: #0: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz-executor/8245: #0: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz.8.273/8276: #0: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by syz-executor/8279: #0: ffff800092969850 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x290/0x4ac net/core/net_namespace.c:512 #1: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by syz-executor/8284: #0: ffff800092969850 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x290/0x4ac net/core/net_namespace.c:512 #1: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by syz-executor/8289: #0: ffff800092969850 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x290/0x4ac net/core/net_namespace.c:512 #1: ffff800092975be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 =============================================