INFO: task syz-executor:6423 blocked for more than 144 seconds. Tainted: G W 6.13.0-rc6-syzkaller-g6251d1776bc5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6423 tgid:6423 ppid:1 flags:0x00000009 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1744/0x27f0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6848 wb_wait_for_completion+0x154/0x29c fs/fs-writeback.c:216 __writeback_inodes_sb_nr+0x244/0x2d8 fs/fs-writeback.c:2735 writeback_inodes_sb_nr fs/fs-writeback.c:2752 [inline] writeback_inodes_sb+0x7c/0x90 fs/fs-writeback.c:2767 sync_filesystem+0xa0/0x218 fs/sync.c:54 generic_shutdown_super+0x70/0x2bc fs/super.c:621 bch2_kill_sb+0x40/0x58 fs/bcachefs/fs.c:2278 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1373 __cleanup_mnt+0x20/0x30 fs/namespace.c:1380 task_work_run+0x230/0x2e0 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff80008fb83160 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336 2 locks held by kworker/u8:2/38: #0: ffff0000c20f6948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3203 #1: ffff800099097c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3203 2 locks held by kworker/u8:5/221: 2 locks held by kworker/u8:8/2131: 2 locks held by getty/6183: #0: ffff0000d27d60a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009ba1b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/6423: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505 4 locks held by bch-reclaim/loo/7852: #0: ffff0000f92cb0a8 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x144/0x4b8 fs/bcachefs/journal_reclaim.c:739 #1: ffff0000f9284398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:157 #2: ffff0000f9284740 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x10fc/0x1254 fs/bcachefs/btree_write_buffer.c:516 #3: ffff0000f92a66d0 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x588/0x15ac fs/bcachefs/btree_update_interior.c:1197 1 lock held by udevd/8225: 1 lock held by syz.4.414/8474: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.4.414/8483: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.4.414/8487: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.4.414/8490: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.4.414/8493: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.4.414/8499: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.4.414/8501: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 1 lock held by syz.4.414/8504: #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff0000caab20e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x244/0x33c fs/super.c:120 2 locks held by kworker/u8:11/8741: 1 lock held by syz.1.930/10401: 1 lock held by syz.5.931/10399: #0: ffff0000f14be208 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #0: ffff0000f14be208 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:639 [inline] #0: ffff0000f14be208 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x80/0x1e8 net/socket.c:1408 1 lock held by syz.6.934/10408: 1 lock held by syz.0.936/10411: #0: ffff0000dca5c408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #0: ffff0000dca5c408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:639 [inline] #0: ffff0000dca5c408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x80/0x1e8 net/socket.c:1408 1 lock held by syz.0.936/10413: #0: ffff800091398268 (reading_mutex){+.+.}-{4:4}, at: rng_dev_read+0xe8/0x624 drivers/char/hw_random/core.c:225 =============================================