INFO: task kworker/u8:3:44 blocked for more than 144 seconds. Not tainted 6.12.0-rc6-syzkaller-geb17c12d043d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:3 state:D stack:0 pid:44 tgid:44 ppid:2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:0) Call trace: __switch_to+0x418/0x7a4 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5328 [inline] __schedule+0x16e0/0x27d0 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6782 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6839 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:684 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 jfs_commit_inode+0x1d4/0x4f8 fs/jfs/inode.c:102 jfs_write_inode+0x128/0x200 fs/jfs/inode.c:132 write_inode fs/fs-writeback.c:1503 [inline] __writeback_single_inode+0x5a4/0x156c fs/fs-writeback.c:1723 writeback_sb_inodes+0x648/0x1090 fs/fs-writeback.c:1954 __writeback_inodes_wb+0xec/0x234 fs/fs-writeback.c:2025 wb_writeback+0x400/0xf0c fs/fs-writeback.c:2136 wb_check_background_flush fs/fs-writeback.c:2206 [inline] wb_do_writeback fs/fs-writeback.c:2294 [inline] wb_workfn+0xc2c/0x104c fs/fs-writeback.c:2321 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff80008f9efda0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 4 locks held by kworker/u8:3/44: #0: ffff0000c20f6948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff800097fe7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 #2: ffff0000c80200e0 (&type->s_umount_key#71){++++}-{3:3}, at: super_trylock_shared+0x28/0xe4 fs/super.c:562 #3: ffff0000f0992fe0 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x1d4/0x4f8 fs/jfs/inode.c:102 4 locks held by kworker/u8:4/235: #0: ffff0000c1891948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff80009b5e7c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 #2: ffff800092717850 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x13c/0x9b4 net/core/net_namespace.c:580 #3: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 2 locks held by kworker/u8:8/5092: #0: ffff0001b364b918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:598 [inline] #0: ffff0001b364b918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1505 [inline] #0: ffff0001b364b918 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1804 [inline] #0: ffff0001b364b918 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2e0/0x27d0 kernel/sched/core.c:6589 #1: ffff0001b3636388 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x394/0x5e8 kernel/sched/psi.c:987 1 lock held by dhcpcd/6091: #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x5e8/0xa9c net/core/rtnetlink.c:6672 2 locks held by getty/6182: #0: ffff0000d2d5a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b84b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 4 locks held by syz.0.21/6618: 3 locks held by kworker/u8:10/7038: #0: ffff0000d24db148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff8000a17a7c20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 #2: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 3 locks held by kworker/u8:11/7267: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x628/0x1600 kernel/workqueue.c:3203 #1: ffff80009e517c20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6bc/0x1600 kernel/workqueue.c:3203 #2: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz-executor/8343: #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x5e8/0xa9c net/core/rtnetlink.c:6672 7 locks held by syz-executor/8464: #0: ffff0000d84c0420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ffff0000d84c0420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x354/0xcf4 fs/read_write.c:679 #1: ffff0000cf5bcc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000cd343a58 (kn->active#45){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff800091882308 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x170/0x704 drivers/net/netdevsim/bus.c:166 #4: ffff0000f00460e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff0000f00460e8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x90/0x434 drivers/base/dd.c:1005 #5: ffff0000f0047250 (&devlink->lock_key#16){+.+.}-{3:3}, at: devl_lock+0x24/0x34 net/devlink/core.c:276 #6: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79 1 lock held by syz-executor/8473: #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x5e8/0xa9c net/core/rtnetlink.c:6672 4 locks held by syz-executor/8502: #0: ffff0000d84c0420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ffff0000d84c0420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x354/0xcf4 fs/read_write.c:679 #1: ffff0000ce223488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:325 #2: ffff0000cd343a58 (kn->active#45){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:326 #3: ffff800091882308 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x170/0x704 drivers/net/netdevsim/bus.c:166 1 lock held by syz.0.282/8762: #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffff800092723d68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x5e8/0xa9c net/core/rtnetlink.c:6672 =============================================