INFO: task kworker/u4:1:11 blocked for more than 146 seconds. Not tainted 6.1.25-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:1 state:D stack:0 pid:11 ppid:2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:0) Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5241 [inline] __schedule+0xee4/0x1c98 kernel/sched/core.c:6554 schedule+0xc4/0x170 kernel/sched/core.c:6630 rwsem_down_write_slowpath+0xc80/0x156c kernel/locking/rwsem.c:1189 __down_write_common kernel/locking/rwsem.c:1314 [inline] __down_write kernel/locking/rwsem.c:1323 [inline] down_write+0x84/0x88 kernel/locking/rwsem.c:1574 f2fs_down_write fs/f2fs/f2fs.h:2207 [inline] f2fs_balance_fs+0x40c/0x60c fs/f2fs/segment.c:418 f2fs_write_inode+0x42c/0x4a0 fs/f2fs/inode.c:757 write_inode fs/fs-writeback.c:1440 [inline] __writeback_single_inode+0x614/0x1770 fs/fs-writeback.c:1652 writeback_sb_inodes+0x978/0x16c0 fs/fs-writeback.c:1878 __writeback_inodes_wb+0x110/0x39c fs/fs-writeback.c:1949 wb_writeback+0x428/0x1130 fs/fs-writeback.c:2054 wb_check_old_data_flush fs/fs-writeback.c:2154 [inline] wb_do_writeback fs/fs-writeback.c:2207 [inline] wb_workfn+0xc08/0x1034 fs/fs-writeback.c:2235 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 INFO: task kworker/u4:12:5165 blocked for more than 148 seconds. Not tainted 6.1.25-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:12 state:D stack:0 pid:5165 ppid:2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:2) Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5241 [inline] __schedule+0xee4/0x1c98 kernel/sched/core.c:6554 schedule+0xc4/0x170 kernel/sched/core.c:6630 rwsem_down_write_slowpath+0xc80/0x156c kernel/locking/rwsem.c:1189 __down_write_common kernel/locking/rwsem.c:1314 [inline] __down_write kernel/locking/rwsem.c:1323 [inline] down_write+0x84/0x88 kernel/locking/rwsem.c:1574 f2fs_down_write fs/f2fs/f2fs.h:2207 [inline] f2fs_balance_fs+0x40c/0x60c fs/f2fs/segment.c:418 f2fs_write_inode+0x42c/0x4a0 fs/f2fs/inode.c:757 write_inode fs/fs-writeback.c:1440 [inline] __writeback_single_inode+0x614/0x1770 fs/fs-writeback.c:1652 writeback_sb_inodes+0x978/0x16c0 fs/fs-writeback.c:1878 __writeback_inodes_wb+0x110/0x39c fs/fs-writeback.c:1949 wb_writeback+0x428/0x1130 fs/fs-writeback.c:2054 wb_check_old_data_flush fs/fs-writeback.c:2154 [inline] wb_do_writeback fs/fs-writeback.c:2207 [inline] wb_workfn+0xc08/0x1034 fs/fs-writeback.c:2235 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Showing all locks held in the system: 3 locks held by kworker/u4:0/9: 4 locks held by kworker/u4:1/11: #0: ffff0000c0e3d938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2262 #1: ffff800019b67c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2264 #2: ffff00012ef180e0 (&type->s_umount_key#49){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:415 #3: ffff0000d9b0d140 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2207 [inline] #3: ffff0000d9b0d140 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x40c/0x60c fs/f2fs/segment.c:418 1 lock held by rcu_tasks_kthre/12: #0: ffff800015754930 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by rcu_tasks_trace/13: #0: ffff800015755130 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/28: #0: ffff800015754760 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:305 2 locks held by getty/3989: #0: ffff0000d434a098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001ca102f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1210 drivers/tty/n_tty.c:2177 1 lock held by syz-fuzzer/4461: 3 locks held by kworker/0:6/4420: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2262 #1: ffff80001e377c20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2264 #2: ffff800017b4b5a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 5 locks held by kworker/u4:6/4432: #0: ffff0000c03dd138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2262 #1: ffff80001e3c7c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2264 #2: ffff800017b3f710 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x994 net/core/net_namespace.c:563 #3: ffff800017b4b5a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 #4: ffff0001286253e8 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_netns_pre_exit+0xbc/0x1d0 drivers/net/wireguard/device.c:425 3 locks held by kworker/u4:8/4661: 2 locks held by kworker/u4:9/4896: 2 locks held by syz-executor.2/5124: 4 locks held by kworker/u4:12/5165: #0: ffff0000c0e3d938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2262 #1: ffff80001f137c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2264 #2: ffff00012c5ca0e0 (&type->s_umount_key#49){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:415 #3: ffff0000cbae9140 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2207 [inline] #3: ffff0000cbae9140 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x40c/0x60c fs/f2fs/segment.c:418 3 locks held by syz-executor.0/5241: =============================================