INFO: task kworker/u4:6:4143 blocked for more than 143 seconds. Not tainted 5.15.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack: 0 pid: 4143 ppid: 2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:3) Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xe00/0x1c0c kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 rwsem_down_write_slowpath+0xcb8/0x13f4 kernel/locking/rwsem.c:1165 __down_write_common kernel/locking/rwsem.c:1292 [inline] __down_write kernel/locking/rwsem.c:1301 [inline] down_write+0xe8/0x12c kernel/locking/rwsem.c:1552 f2fs_balance_fs+0x3a4/0x650 fs/f2fs/segment.c:528 f2fs_write_inode+0x3f4/0x598 fs/f2fs/inode.c:738 write_inode fs/fs-writeback.c:1495 [inline] __writeback_single_inode+0x560/0x11f0 fs/fs-writeback.c:1705 writeback_sb_inodes+0x7fc/0x1378 fs/fs-writeback.c:1930 __writeback_inodes_wb+0x110/0x394 fs/fs-writeback.c:2001 wb_writeback+0x3ec/0xe44 fs/fs-writeback.c:2106 wb_check_background_flush fs/fs-writeback.c:2172 [inline] wb_do_writeback fs/fs-writeback.c:2260 [inline] wb_workfn+0xa7c/0xdd8 fs/fs-writeback.c:2288 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800014341360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 2 locks held by kworker/u4:1/136: 5 locks held by kworker/u4:4/332: #0: ffff0000c038c138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001f487c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff800016290910 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x12c/0xa98 net/core/net_namespace.c:589 #3: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 #4: ffff800014345e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #4: ffff800014345e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x248/0x5e0 kernel/rcu/tree_exp.h:845 2 locks held by getty/3831: #0: ffff0000d3373098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001bcae2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158 2 locks held by kworker/1:6/4103: #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fac7c00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 2 locks held by kworker/1:8/4115: 4 locks held by kworker/u4:6/4143: #0: ffff0000c207b938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fcd7c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff0000eb76c0e0 (&type->s_umount_key#71){++++}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418 #3: ffff0000e1a791b0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3a4/0x650 fs/f2fs/segment.c:528 3 locks held by kworker/0:6/4149: #0: ffff0000d268e138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fd07c00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 3 locks held by kworker/1:10/4157: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fd77c00 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff0000d8f91400 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x5c/0x938 drivers/net/netdevsim/dev.c:757 4 locks held by kworker/u4:9/4454: #0: ffff0000c207b938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001f627c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff0000d1e14650 (sb_internal#3){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x1bc/0xca0 fs/xfs/libxfs/xfs_bmap.c:4573 #3: ffff0000eab1bce8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: mrupdate_nested fs/xfs/mrlock.h:36 [inline] #3: ffff0000eab1bce8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0x264/0x474 fs/xfs/xfs_inode.c:201 2 locks held by kworker/1:11/4996: 4 locks held by kworker/u4:12/5263: #0: ffff0000c207b938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff800020547c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff0000fbae80e0 (&type->s_umount_key#71){++++}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418 #3: ffff0000f98751b0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3a4/0x650 fs/f2fs/segment.c:528 2 locks held by syz.4.257/5401: #0: ffff0000d1e140e0 (&type->s_umount_key#62){++++}-{3:3}, at: deactivate_super+0xf0/0x118 fs/super.c:365 #1: ffff0000cbfcc7d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000cbfcc7d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x170/0x824 fs/fs-writeback.c:2768 4 locks held by syz.3.343/5830: 6 locks held by syz.5.399/6327: 4 locks held by syz-executor/6612: #0: ffff0000d4f08460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xa2c fs/read_write.c:590 #1: ffff0000ce7f7088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c0/0x478 fs/kernfs/file.c:287 #2: ffff0000c5dd2a00 (kn->active#235){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1dc/0x478 fs/kernfs/file.c:288 #3: ffff80001586c388 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd4/0x33c drivers/net/netdevsim/bus.c:344 7 locks held by syz-executor/6616: #0: ffff0000d4f08460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xa2c fs/read_write.c:590 #1: ffff0000cd527888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c0/0x478 fs/kernfs/file.c:287 #2: ffff0000c5dd2a00 (kn->active#235){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1dc/0x478 fs/kernfs/file.c:288 #3: ffff80001586c388 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd4/0x33c drivers/net/netdevsim/bus.c:344 #4: ffff0000cad6f178 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff0000cad6f178 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1044 [inline] #4: ffff0000cad6f178 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x9c/0x63c drivers/base/dd.c:1259 #5: ffff0000d8f91400 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1359 [inline] #5: ffff0000d8f91400 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_reload_destroy+0xf4/0x204 drivers/net/netdevsim/dev.c:1561 #6: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 1 lock held by syz-executor/6732: #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x98c/0xd04 net/core/rtnetlink.c:5647 1 lock held by syz-executor/6735: #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x98c/0xd04 net/core/rtnetlink.c:5647 3 locks held by kworker/1:14/6745: #0: ffff0000d268e138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff8000214c7c00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 1 lock held by syz.0.408/6922: #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 1 lock held by cmp/6940: =============================================