INFO: INFO: task syz-executor.0:6750 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:6750 tgid:6750 ppid:1 task_flags:0x400140 flags:0x00000009 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x13b0/0x2864 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xb4/0x230 kernel/sched/core.c:7026 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7083 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:676 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 fuse_lock_inode+0xd4/0x128 fs/fuse/inode.c:604 fuse_lookup+0x134/0x538 fs/fuse/dir.c:427 __lookup_slow+0x254/0x378 fs/namei.c:1816 lookup_slow+0x5c/0x80 fs/namei.c:1833 walk_component fs/namei.c:2151 [inline] link_path_walk+0x790/0xc98 fs/namei.c:2519 path_openat+0x1cc/0x2c40 fs/namei.c:4130 do_filp_open+0x18c/0x36c fs/namei.c:4161 do_sys_openat2+0x11c/0x1b4 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1463 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 INFO: task syz-executor.0:6833 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:6833 tgid:6822 ppid:6750 task_flags:0x400140 flags:0x00000019 Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x13b0/0x2864 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xb4/0x230 kernel/sched/core.c:7026 request_wait_answer fs/fuse/dev.c:585 [inline] __fuse_request_send fs/fuse/dev.c:599 [inline] __fuse_simple_request+0xe04/0x1694 fs/fuse/dev.c:693 fuse_simple_request fs/fuse/fuse_i.h:1250 [inline] fuse_lookup_name+0x280/0x6c8 fs/fuse/dir.c:381 fuse_lookup+0x178/0x538 fs/fuse/dir.c:428 __lookup_slow+0x254/0x378 fs/namei.c:1816 lookup_slow+0x5c/0x80 fs/namei.c:1833 walk_component fs/namei.c:2151 [inline] link_path_walk+0x790/0xc98 fs/namei.c:2519 path_openat+0x1cc/0x2c40 fs/namei.c:4130 do_filp_open+0x18c/0x36c fs/namei.c:4161 do_sys_openat2+0x11c/0x1b4 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1463 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 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+0x5c/0x254 arch/arm64/kernel/entry-common.c:746 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/32: #0: ffff80008f76b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by pr/ttyAMA-1/43: 2 locks held by getty/6340: #0: ffff0000d32e50a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000991842f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222 2 locks held by syz-executor.0/6750: #0: ffff0000e39a8148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline] #0: ffff0000e39a8148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow+0x4c/0x80 fs/namei.c:1832 #1: ffff0000e39a85f8 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd4/0x128 fs/fuse/inode.c:604 2 locks held by syz-executor.0/6833: #0: ffff0000e39a8148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline] #0: ffff0000e39a8148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow+0x4c/0x80 fs/namei.c:1832 #1: ffff0000e39a85f8 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd4/0x128 fs/fuse/inode.c:604 =============================================