INFO: task syz-executor:4741 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 state:D stack: 0 pid: 4741 ppid: 1 flags:0x00000001 Call trace: __switch_to+0x2f4/0x540 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5049 [inline] __schedule+0xe20/0x1c6c kernel/sched/core.c:6395 schedule+0x11c/0x1c8 kernel/sched/core.c:6478 bit_wait+0x1c/0xac kernel/sched/wait_bit.c:199 __wait_on_bit kernel/sched/wait_bit.c:49 [inline] out_of_line_wait_on_bit+0x16c/0x218 kernel/sched/wait_bit.c:64 wait_on_bit include/linux/wait_bit.h:76 [inline] gfs2_glock_wait fs/gfs2/glock.c:1282 [inline] gfs2_glock_nq+0x8dc/0x13d0 fs/gfs2/glock.c:1538 gfs2_glock_nq_init fs/gfs2/glock.h:246 [inline] __gfs2_lookup+0x120/0x28c fs/gfs2/inode.c:883 gfs2_lookup+0x2c/0x3c fs/gfs2/inode.c:908 __lookup_slow+0x25c/0x39c fs/namei.c:1671 lookup_slow+0x60/0x84 fs/namei.c:1688 walk_component+0x2b8/0x3b8 fs/namei.c:1984 lookup_last fs/namei.c:2439 [inline] path_lookupat+0x168/0x3f0 fs/namei.c:2463 filename_lookup+0x1c8/0x478 fs/namei.c:2492 user_path_at_empty+0x5c/0x1a0 fs/namei.c:2891 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1786 [inline] __do_sys_umount fs/namespace.c:1794 [inline] __se_sys_umount fs/namespace.c:1792 [inline] __arm64_sys_umount+0xf8/0x184 fs/namespace.c:1792 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x28c arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x5c/0x140 arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1d0 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: ffff800014561460 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:312 2 locks held by getty/3800: #0: ffff0000d309c098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001bf5e2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xf90 drivers/tty/n_tty.c:2158 3 locks held by kworker/1:5/4079: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1 #1: ffff80001fa47c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285 #2: ffff0000cbb86240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1d8/0x27c4 drivers/net/netdevsim/fib.c:1480 3 locks held by kworker/1:8/4153: #0: ffff0000d3810d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1 #1: ffff80001f9c7c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285 #2: ffff8000164b78e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 5 locks held by kworker/u4:5/4295: #0: ffff0000c038c138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1 #1: ffff8000204f7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285 #2: ffff8000164abd50 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x13c/0xab8 net/core/net_namespace.c:589 #3: ffff8000164b78e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 #4: ffff800014565f28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #4: ffff800014565f28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x340/0x674 kernel/rcu/tree_exp.h:845 3 locks held by kworker/0:5/4404: #0: ffff0000d3810d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1 #1: ffff80001f767c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285 #2: ffff8000164b78e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 1 lock held by syz-executor/4741: #0: ffff0000e7e3b790 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline] #0: ffff0000e7e3b790 (&type->i_mutex_dir_key#8){.+.+}-{3:3}, at: lookup_slow+0x50/0x84 fs/namei.c:1687 3 locks held by kworker/0:18/4887: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1 #1: ffff800020077c40 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285 #2: ffff8000164b78e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72 2 locks held by kworker/0:22/4892: #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x67c/0x1178 kernel/workqueue.c:-1 #1: ffff800020117c40 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6c0/0x1178 kernel/workqueue.c:2285 2 locks held by udevd/4929: #0: ffff0000cc064118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xdc/0x6c4 block/bdev.c:915 #1: ffff0000cc057468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa0/0x988 drivers/block/loop.c:1366 2 locks held by syz.1.621/6777: =============================================