INFO: task syz.4.21:6176 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.21 state:D stack:24584 pid:6176 tgid:6175 ppid:6147 task_flags:0x400140 flags:0x00080003 Call Trace: context_switch kernel/sched/core.c:5254 [inline] __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862 __schedule_loop kernel/sched/core.c:6944 [inline] schedule+0x165/0x360 kernel/sched/core.c:6959 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016 rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1261 [inline] __down_read kernel/locking/rwsem.c:1274 [inline] down_read_nested+0x9a/0x2f0 kernel/locking/rwsem.c:1663 dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790 diNewExt+0x9af/0x3150 fs/jfs/jfs_imap.c:2261 diAllocExt fs/jfs/jfs_imap.c:1952 [inline] diAllocAG+0xe86/0x1df0 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x193/0xa70 fs/jfs/namei.c:225 vfs_mkdir+0x306/0x510 fs/namei.c:4453 do_mkdirat+0x247/0x590 fs/namei.c:4486 __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4501 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f77e8f8efc9 RSP: 002b:00007f77e9d8f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f77e91e5fa0 RCX: 00007f77e8f8efc9 RDX: 0000000000000408 RSI: 0000200000000300 RDI: 0000000000000004 RBP: 00007f77e9011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f77e91e6038 R14: 00007f77e91e5fa0 R15: 00007fffc773f9f8 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8df3d6e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df3d6e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8df3d6e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:7/1166: 3 locks held by kworker/u9:1/5148: #0: ffff88807b03e148 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline] #0: ffff88807b03e148 ((wq_completion)hci6){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346 #1: ffffc9000df87ba0 ((work_completion)(&hdev->cmd_sync_work) ){+.+.}-{0:0} , at: process_one_work kernel/workqueue.c:3239 [inline] , at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346 #2: ffff88805bbc8dc8 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d4/0x3a0 net/bluetooth/hci_sync.c:331 1 lock held by klogd/5187: 2 locks held by getty/5588: #0: ffff888033d300a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 1 lock held by syz.0.17/6063: 6 locks held by syz.1.18/6090: 1 lock held by syz.2.19/6120: 1 lock held by syz.3.20/6145: 5 locks held by syz.4.21/6176: #0: ffff888029e4c420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:508 #1: ffff8880759ae108 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline] #1: ffff8880759ae108 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0 fs/namei.c:4226 #2: ffff888078c08920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1 #3: ffff8880759ad3a0 ( &jfs_ip->rdwrlock /1 ){++++}-{4:4} , at: diNewIAG fs/jfs/jfs_imap.c:2617 [inline] , at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] , at: diAllocAG+0x7ad/0x1df0 fs/jfs/jfs_imap.c:1669 #4: ffff8880759aca78 ( &jfs_ip->rdwrlock #2 /2 ){++++}-{4:4} , at: dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790 7 locks held by syz.4.21/6177: 5 locks held by syz.5.22/6214: #0: ffff888023d04420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:508 #1: ffff888075baceb8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline] #1: ffff888075baceb8 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x1f8/0x3c0 fs/namei.c:4226 #2: ffff888059680920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diAlloc+0x1b5/0x1680 fs/jfs/jfs_imap.c:-1 #3: ffff888075bac150 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2617 [inline] #3: ffff888075bac150 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] #3: ffff888075bac150 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocAG+0x7ad/0x1df0 fs/jfs/jfs_imap.c:1669 #4: ffff888075bab828 (&jfs_ip->rdwrlock#2/2){++++}-{4:4}, at: dbAlloc+0x3a7/0xba0 fs/jfs/jfs_dmap.c:790 2 locks held by syz.5.22/6216: 5 locks held by syz.6.23/6248: #0: ffff88807d5f2420 ( sb_writers #12 ){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:508 #1: ffff888075bb8ea0 ( &type->i_mutex_dir_key #8 /1 ){+.+.}-{4:4}