INFO: task syz.2.17:5165 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.17 state:D stack: 0 pid: 5165 ppid: 4921 flags:0x00000001 Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5049 [inline] __schedule+0xe08/0x1bf8 kernel/sched/core.c:6395 schedule+0x11c/0x1c8 kernel/sched/core.c:6478 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6537 rwsem_down_read_slowpath+0x46c/0x8bc kernel/locking/rwsem.c:1055 __down_read_common kernel/locking/rwsem.c:1239 [inline] __down_read kernel/locking/rwsem.c:1252 [inline] down_read+0x100/0x390 kernel/locking/rwsem.c:1500 inode_lock_shared include/linux/fs.h:797 [inline] lookup_slow+0x4c/0x80 fs/namei.c:1687 walk_component+0x2b0/0x3a8 fs/namei.c:1984 lookup_last fs/namei.c:2439 [inline] path_lookupat+0x13c/0x3d0 fs/namei.c:2463 filename_lookup+0x180/0x414 fs/namei.c:2492 user_path_at_empty+0x5c/0x1a0 fs/namei.c:2891 user_path_at include/linux/namei.h:57 [inline] do_mount fs/namespace.c:3374 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount fs/namespace.c:3562 [inline] __arm64_sys_mount+0x4e0/0x5e4 fs/namespace.c:3562 __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+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 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: 1 lock held by khungtaskd/27: #0: ffff8000143614a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:312 2 locks held by kworker/u4:4/547: 2 locks held by getty/3806: #0: ffff0000d5469098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001bd0b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158 2 locks held by syz.2.17/5161: 1 lock held by syz.2.17/5165: #0: ffff0000eee60188 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0000eee60188 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 2 locks held by syz.1.16/5452: 1 lock held by syz.1.16/5457: #0: ffff0000eee606d0 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0000eee606d0 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 2 locks held by syz.3.18/5470: 1 lock held by syz.3.18/5476: #0: ffff00010362c188 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff00010362c188 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 2 locks held by syz.0.15/5484: 1 lock held by syz.0.15/5490: #0: ffff00010362c6d0 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff00010362c6d0 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 3 locks held by syz.4.19/5487: 1 lock held by syz.4.19/5491: #0: ffff00010362cc18 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff00010362cc18 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 2 locks held by syz.5.20/5635: 1 lock held by syz.5.20/5636: #0: ffff00010362d160 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff00010362d160 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 2 locks held by syz.7.22/5747: 1 lock held by syz.7.22/5751: #0: ffff00010362d6a8 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff00010362d6a8 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 2 locks held by syz.6.21/5755: 1 lock held by syz.6.21/5756: #0: ffff0000eee60c18 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0000eee60c18 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 2 locks held by syz.8.23/5759: 1 lock held by syz.8.23/5764: #0: ffff00010362dbf0 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff00010362dbf0 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 3 locks held by syz.9.24/5763: 1 lock held by syz.9.24/5765: #0: ffff0000eee61160 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0000eee61160 (&type->i_mutex_dir_key#9){.+.+}-{3:3}, at: lookup_slow+0x4c/0x80 fs/namei.c:1687 1 lock held by syz.3.1781/11178: #0: ffff8000148dec78 (tomoyo_ss){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:312 1 lock held by syz.4.1782/11183: #0: ffff8000148dec78 (tomoyo_ss){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:312 3 locks held by modprobe/11184: =============================================