INFO: task syz.1.24:4526 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.24 state:D stack:25696 pid:4526 ppid:4390 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 schedule_timeout+0x97/0x280 kernel/time/timer.c:2144 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x2b9/0x590 kernel/sched/completion.c:138 kthread_stop+0x197/0x650 kernel/kthread.c:711 signal_our_withdraw fs/gfs2/util.c:159 [inline] gfs2_withdraw+0x643/0x1780 fs/gfs2/util.c:354 gfs2_metatype_check_ii+0x74/0x90 fs/gfs2/util.c:533 gfs2_metatype_check_i fs/gfs2/util.h:129 [inline] gfs2_quota_init+0xc81/0xe80 fs/gfs2/quota.c:1406 gfs2_make_fs_rw+0x3f5/0x560 fs/gfs2/super.c:155 gfs2_fill_super+0x1888/0x1f80 fs/gfs2/ops_fstype.c:1271 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1327 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f32a0790eea RSP: 002b:00007ffcd89139c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffcd8913a50 RCX: 00007f32a0790eea RDX: 0000200000000400 RSI: 0000200000012500 RDI: 00007ffcd8913a10 RBP: 0000200000000400 R08: 00007ffcd8913a50 R09: 0000000002000000 R10: 0000000002000000 R11: 0000000000000246 R12: 0000200000012500 R13: 00007ffcd8913a10 R14: 00000000000125d8 R15: 00002000000022c0 INFO: task gfs2_quotad:4530 blocked for more than 147 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:gfs2_quotad state:D stack:28240 pid:4530 ppid:2 flags:0x00024000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 bit_wait+0xd/0xc0 kernel/sched/wait_bit.c:199 __wait_on_bit+0xa8/0x2d0 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0x11f/0x160 kernel/sched/wait_bit.c:64 wait_on_bit include/linux/wait_bit.h:76 [inline] __gfs2_glock_dq+0x6b1/0xa20 fs/gfs2/glock.c:1646 gfs2_glock_dq+0x1a8/0x1c0 fs/gfs2/glock.c:1718 gfs2_glock_dq_uninit+0x24/0xe0 fs/gfs2/glock.c:1738 gfs2_statfs_sync+0x6fe/0x780 fs/gfs2/super.c:310 quotad_check_timeo fs/gfs2/quota.c:1519 [inline] gfs2_quotad+0x380/0x670 fs/gfs2/quota.c:1561 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 3 locks held by kworker/u4:1/11: #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc90000107d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #2: ffffffff8db3b3a8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c92bab0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c92c2d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8c92b120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513 2 locks held by kworker/u4:3/52: #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc90000bd7d00 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 2 locks held by kworker/u4:4/62: #0: ffff8880b8f3aad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537 #1: ffff8880b8f27848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x398/0x6d0 kernel/sched/psi.c:999 3 locks held by kworker/0:2/126: #0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc90002df7d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #2: ffffffff8db3b3a8 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:104 1 lock held by dhcpcd/3933: #0: ffffffff8db3b3a8 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x288/0x1af0 net/ipv4/devinet.c:1080 2 locks held by getty/4029: #0: ffff88814cb7f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198 3 locks held by kworker/0:6/4333: 2 locks held by kworker/1:12/4373: #0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc90003347d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 2 locks held by udevd/4429: #0: ffff88801788d420 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff88801788d420 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_read_iter+0x41d/0x570 block/fops.c:667 #1: ffff88801788d5c0 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:813 [inline] #1: ffff88801788d5c0 (mapping.invalidate_lock){++++}-{3:3}, at: page_cache_ra_unbounded+0xd8/0x770 mm/readahead.c:226