INFO: task syz-executor:4038 blocked for more than 143 seconds. Not tainted 5.15.188-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack: 0 pid: 4038 ppid: 1 flags:0x00000001 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 wb_wait_for_completion+0x15c/0x2b0 fs/fs-writeback.c:191 sync_inodes_sb+0x188/0x824 fs/fs-writeback.c:2770 sync_filesystem+0x160/0x218 fs/sync.c:64 generic_shutdown_super+0x70/0x2f0 fs/super.c:448 kill_block_super+0x70/0xdc fs/super.c:1427 deactivate_locked_super+0xb8/0x13c fs/super.c:335 deactivate_super+0xf8/0x118 fs/super.c:366 cleanup_mnt+0x3a4/0x458 fs/namespace.c:1139 __cleanup_mnt+0x20/0x30 fs/namespace.c:1146 task_work_run+0x12c/0x1e0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:949 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/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: 3 locks held by kworker/1:1/25: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001b417c00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff800014355d30 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x49c kernel/rcu/tree.c:4043 1 lock held by khungtaskd/27: #0: ffff800014351360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 4 locks held by kworker/u4:1/136: #0: ffff0000c21e0138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001bd77c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff0000c7aee650 (sb_internal#5){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x1bc/0xca0 fs/xfs/libxfs/xfs_bmap.c:4573 #3: ffff0000de34ade8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: mrupdate_nested fs/xfs/mrlock.h:36 [inline] #3: ffff0000de34ade8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0x264/0x474 fs/xfs/xfs_inode.c:201 1 lock held by udevd/3652: #0: ffff0000cb5bc918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x120/0x874 block/bdev.c:820 2 locks held by getty/3806: #0: ffff0000d4390098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001b7c62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158 2 locks held by syz-executor/4038: #0: ffff0000c7aee0e0 (&type->s_umount_key#78){++++}-{3:3}, at: deactivate_super+0xf0/0x118 fs/super.c:365 #1: ffff0000cb7127d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000cb7127d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x170/0x824 fs/fs-writeback.c:2768 3 locks held by kworker/0:8/4131: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001f877c00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff0000d305d240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1c8/0x2704 drivers/net/netdevsim/fib.c:1480 3 locks held by kworker/1:7/4209: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fb17c00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff800014355d30 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x49c kernel/rcu/tree.c:4043 3 locks held by kworker/1:8/4210: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fbc7c00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff800014355d30 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x49c kernel/rcu/tree.c:4043 2 locks held by kworker/1:9/4211: 3 locks held by kworker/1:10/4212: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fa07c00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff800014355d30 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x49c kernel/rcu/tree.c:4043 3 locks held by kworker/1:13/4215: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fc87c00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff800014355d30 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x49c kernel/rcu/tree.c:4043 2 locks held by kworker/0:14/4797: #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fe67c00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 2 locks held by kworker/0:15/4798: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001bb97c00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 2 locks held by kworker/u4:8/4947: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fcf7c00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 3 locks held by kworker/1:15/5232: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fcb7c00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff800014355d30 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x49c kernel/rcu/tree.c:4043 3 locks held by kworker/u4:13/5479: #0: ffff0000c038c138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001ffe7c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff8000162a1f10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x12c/0xa98 net/core/net_namespace.c:589 2 locks held by kworker/u4:15/6138: 1 lock held by syz-executor/6765: #0: ffff800014355d30 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x54/0x49c kernel/rcu/tree.c:4043 1 lock held by udevd/7240: #0: ffff0000cb5bc918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x120/0x874 block/bdev.c:820 2 locks held by syz.0.647/7344: #0: ffff0000cb5bc918 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xdc/0x6ac block/bdev.c:915 #1: ffff0000cb5f4468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x50/0x204 drivers/block/loop.c:2071 1 lock held by syz.5.667/7427: 2 locks held by syz.5.667/7444: #0: ffff0000d49fe070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:437 [inline] #0: ffff0000d49fe070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig fs/fsopen.c:314 [inline] #0: ffff0000d49fe070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __arm64_sys_fsconfig+0x604/0x77c fs/fsopen.c:314 #1: ffff800014355e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffff800014355e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2f0/0x5e0 kernel/rcu/tree_exp.h:845 2 locks held by dhcpcd-run-hook/7452: =============================================