INFO: task syz.3.24:6672 blocked for more than 143 seconds. Not tainted 6.16.0-rc1-syzkaller-g19272b37aa4f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.24 state:D stack:0 pid:6672 tgid:6671 ppid:6489 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x414/0x834 arch/arm64/kernel/process.c:735 (T) context_switch kernel/sched/core.c:5396 [inline] __schedule+0x1414/0x2a28 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6878 netfs_wait_for_request+0x1a0/0x5ac fs/netfs/misc.c:450 netfs_wait_for_write+0x28/0x38 fs/netfs/misc.c:486 netfs_unbuffered_write_iter_locked+0x4d4/0x958 fs/netfs/direct_write.c:110 netfs_unbuffered_write_iter+0x448/0x654 fs/netfs/direct_write.c:193 v9fs_file_write_iter+0xa4/0xd8 fs/9p/vfs_file.c:404 do_iter_readv_writev+0x460/0x6a8 fs/read_write.c:-1 vfs_writev+0x29c/0x7cc fs/read_write.c:1057 do_writev+0x128/0x290 fs/read_write.c:1103 __do_sys_writev fs/read_write.c:1171 [inline] __se_sys_writev fs/read_write.c:1168 [inline] __arm64_sys_writev+0x80/0x94 fs/read_write.c:1168 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff80008f749e40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by kworker/u8:4/170: 2 locks held by kworker/u8:5/316: 3 locks held by kworker/u8:8/669: 2 locks held by kworker/u8:9/738: 2 locks held by getty/6259: #0: ffff0000d23f60a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b8db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222 1 lock held by syz-executor/6493: #0: ffff0000f8e920e0 (&type->s_umount_key#64){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff0000f8e920e0 (&type->s_umount_key#64){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff0000f8e920e0 (&type->s_umount_key#64){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:506 1 lock held by syz-executor/6498: #0: ffff80008f74f9b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline] #0: ffff80008f74f9b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x33c/0x628 kernel/rcu/tree_exp.h:998 1 lock held by udevd/6643: 2 locks held by udevd/6654: 3 locks held by syz.3.24/6672: #0: ffff0000d53fa9b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x1fc/0x2a0 fs/file.c:1213 #1: ffff0000c588e428 (sb_writers#15){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline] #1: ffff0000c588e428 (sb_writers#15){.+.+}-{0:0}, at: vfs_writev+0x21c/0x7cc fs/read_write.c:1055 #2: ffff0000f3fb0148 (&sb->s_type->i_mutex_key#26){++++}-{4:4}, at: netfs_start_io_direct+0x1a4/0x234 fs/netfs/locking.c:188 1 lock held by syz.4.322/7780: #0: ffff0000f8e920e0 (&type->s_umount_key#64){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline] #0: ffff0000f8e920e0 (&type->s_umount_key#64){++++}-{4:4}, at: super_lock+0x240/0x32c fs/super.c:121 2 locks held by syz.5.536/8560: 1 lock held by syz.7.537/8562: #0: ffff80008f74f9b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline] #0: ffff80008f74f9b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x290/0x628 kernel/rcu/tree_exp.h:998 =============================================