INFO: task kworker/u4:5:1613 blocked for more than 143 seconds. Not tainted 5.15.167-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:5 state:D stack: 0 pid: 1613 ppid: 2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:2) Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5027 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6373 schedule+0x11c/0x1c8 kernel/sched/core.c:6456 rwsem_down_write_slowpath+0xd94/0x17e0 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+0x3e8/0x6a0 fs/f2fs/segment.c:528 f2fs_write_inode+0x42c/0x4a0 fs/f2fs/inode.c:736 write_inode fs/fs-writeback.c:1495 [inline] __writeback_single_inode+0x584/0x13a4 fs/fs-writeback.c:1705 writeback_sb_inodes+0x94c/0x1654 fs/fs-writeback.c:1930 __writeback_inodes_wb+0x110/0x39c fs/fs-writeback.c:2001 wb_writeback+0x410/0xfc8 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+0xc44/0x1070 fs/fs-writeback.c:2288 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 INFO: task syz.3.92:4541 blocked for more than 143 seconds. Not tainted 5.15.167-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.92 state:D stack: 0 pid: 4541 ppid: 4029 flags:0x00000009 Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5027 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6373 schedule+0x11c/0x1c8 kernel/sched/core.c:6456 wb_wait_for_completion+0x160/0x2b4 fs/fs-writeback.c:191 sync_inodes_sb+0x220/0x944 fs/fs-writeback.c:2770 sync_inodes_one_sb+0x58/0x70 fs/sync.c:77 iterate_supers+0x124/0x1dc fs/super.c:716 ksys_sync+0xb4/0x1cc fs/sync.c:102 __arm64_sys_sync+0x14/0x24 fs/sync.c:113 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Showing all locks held in the system: 2 locks held by ksoftirqd/1/20: 1 lock held by khungtaskd/27: #0: ffff800014c917e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 4 locks held by kworker/u4:5/1613: #0: ffff0000c21d8138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff800024297c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff0000cf5a20e0 (&type->s_umount_key#57){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:418 #3: ffff0000e35d5108 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3e8/0x6a0 fs/f2fs/segment.c:528 2 locks held by getty/3779: #0: ffff0000ce8f7098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001d62b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158 5 locks held by syz.2.24/4200: 2 locks held by syz.3.92/4541: #0: ffff0000cf5a20e0 (&type->s_umount_key#57){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:714 #1: ffff0000cc04e7d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000cc04e7d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x208/0x944 fs/fs-writeback.c:2768 3 locks held by kworker/0:9/4648: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff800020e57c00 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff0000e6164400 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x60/0x90c drivers/net/netdevsim/dev.c:757 2 locks held by kworker/u4:20/6316: 4 locks held by kworker/u4:23/6323: #0: ffff0000c03f4138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff8000229b7c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff800016be7090 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x9bc net/core/net_namespace.c:561 #3: ffff800014c95cf0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x4b0 kernel/rcu/tree.c:4039 7 locks held by syz-executor/6969: #0: ffff0000d5352460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xb44 fs/read_write.c:590 #1: ffff0000e6214888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:287 #2: ffff0000ce281cb8 (kn->active#230){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:288 #3: ffff8000161c1248 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xec/0x3bc drivers/net/netdevsim/bus.c:344 #4: ffff0000e6163178 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff0000e6163178 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1044 [inline] #4: ffff0000e6163178 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xbc/0x6ac drivers/base/dd.c:1259 #5: ffff0000e6164400 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1359 [inline] #5: ffff0000e6164400 (&nsim_dev->port_list_lock#2){+.+.}-{3:3}, at: nsim_dev_reload_destroy+0xfc/0x214 drivers/net/netdevsim/dev.c:1561 #6: ffff800014c95cf0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x4b0 kernel/rcu/tree.c:4039 4 locks held by syz-executor/6992: #0: ffff0000d5352460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xb44 fs/read_write.c:590 #1: ffff0000e6dc4888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:287 #2: ffff0000ce281cb8 (kn->active#230){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:288 #3: ffff8000161c1248 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xec/0x3bc drivers/net/netdevsim/bus.c:344 4 locks held by syz-executor/7010: #0: ffff0000d5352460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xb44 fs/read_write.c:590 #1: ffff0000d2ed7888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:287 #2: ffff0000ce281cb8 (kn->active#230){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:288 #3: ffff8000161c1248 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xec/0x3bc drivers/net/netdevsim/bus.c:344 4 locks held by syz-executor/7070: #0: ffff0000d5352460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xb44 fs/read_write.c:590 #1: ffff0000c894a088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c8/0x48c fs/kernfs/file.c:287 #2: ffff0000ce281cb8 (kn->active#230){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1e4/0x48c fs/kernfs/file.c:288 #3: ffff8000161c1248 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xec/0x3bc drivers/net/netdevsim/bus.c:344 =============================================