INFO: task syz.4.5:4154 blocked for more than 143 seconds. Not tainted 5.15.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.5 state:D stack: 0 pid: 4154 ppid: 4023 flags:0x00000001 Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 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 inode_lock include/linux/fs.h:789 [inline] do_truncate+0x1ac/0x28c fs/open.c:63 handle_truncate fs/namei.c:3265 [inline] do_open fs/namei.c:3612 [inline] path_openat+0x20c4/0x26cc fs/namei.c:3742 do_filp_open+0x1a8/0x3b4 fs/namei.c:3769 do_sys_openat2+0x128/0x3e0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280 __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 INFO: task kworker/u4:9:4216 blocked for more than 143 seconds. Not tainted 5.15.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:9 state:D stack: 0 pid: 4216 ppid: 2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:4) Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf10/0x1e48 kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 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:733 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 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800014c91660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 2 locks held by kworker/u4:3/299: 4 locks held by kworker/u4:7/1856: #0: ffff0000c0b80138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff800021477c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff0000c89980e0 (&type->s_umount_key#52){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:418 #3: ffff0000c7ac1108 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3e8/0x6a0 fs/f2fs/segment.c:528 2 locks held by getty/3793: #0: ffff0000d2fc5098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001a4ee2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1204 drivers/tty/n_tty.c:2158 2 locks held by kworker/1:5/4070: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001d157c00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 5 locks held by syz.4.5/4120: 2 locks held by syz.4.5/4154: #0: ffff0000c121c460 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377 #1: ffff0000e70b0150 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff0000e70b0150 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: do_truncate+0x1ac/0x28c fs/open.c:63 4 locks held by kworker/u4:9/4216: #0: ffff0000c0b80138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001d667c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff0000c121c0e0 (&type->s_umount_key#52){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:418 #3: ffff0000d8a81108 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3e8/0x6a0 fs/f2fs/segment.c:528 6 locks held by syz.2.82/4368: 2 locks held by syz.2.82/4396: #0: ffff0000c8998460 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377 #1: ffff0000e70b2750 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff0000e70b2750 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: do_truncate+0x1ac/0x28c fs/open.c:63 4 locks held by kworker/u4:18/4623: #0: ffff0000c03f4138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2283 #1: ffff80001d2c7c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2285 #2: ffff800016be8a10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf4/0x9bc net/core/net_namespace.c:561 #3: ffff0000c817d3e8 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_destruct+0x11c/0x2dc drivers/net/wireguard/device.c:233 2 locks held by syz.1.304/5178: #0: ffff0000c121c0e0 (&type->s_umount_key#52){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:703 #1: ffff0000cbb747d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000cbb747d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x208/0x944 fs/fs-writeback.c:2768 2 locks held by syz.0.322/5251: #0: ffff0000c121c0e0 (&type->s_umount_key#52){++++}-{3:3}, at: iterate_supers+0xb0/0x1dc fs/super.c:703 #1: ffff0000cbb747d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000cbb747d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x208/0x944 fs/fs-writeback.c:2768 2 locks held by syz-executor/5961: #0: ffff0000cba7d118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xe0/0x6b0 block/bdev.c:912 #1: ffff0000cba5f468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa8/0x9b8 drivers/block/loop.c:1365 1 lock held by syz-executor/6042: #0: ffff800014c95c68 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #0: ffff800014c95c68 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x320/0x660 kernel/rcu/tree_exp.h:845 1 lock held by syz.2.616/6594: 1 lock held by syz.3.619/6601: #0: ffff0000cbb30468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa8/0x9b8 drivers/block/loop.c:1365 =============================================