INFO: task syz-executor.0:5417 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00344-g037266a5f723 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:23392 pid:5417  tgid:5417  ppid:1      flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x120/0x330 kernel/locking/rwsem.c:1528
 inode_lock_shared include/linux/fs.h:812 [inline]
 lookup_slow fs/namei.c:1710 [inline]
 walk_component+0x33b/0x5a0 fs/namei.c:2002
 link_path_walk.part.0.constprop.0+0x71f/0xce0 fs/namei.c:2329
 link_path_walk fs/namei.c:2254 [inline]
 path_openat+0x23f/0x2c50 fs/namei.c:3775
 do_filp_open+0x1de/0x430 fs/namei.c:3809
 do_sys_openat2+0x176/0x1e0 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_openat fs/open.c:1471 [inline]
 __se_sys_openat fs/open.c:1466 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1466
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f76c9e7b841
RSP: 002b:00007ffdfc9d7370 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f76c9e7b841
RDX: 0000000000090800 RSI: 00007f76c9ed7b46 RDI: 00000000ffffff9c
RBP: 00007ffdfc9d743c R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 0000000000014252 R14: 0000000000013f05 R15: 0000000000000009
 </TASK>
INFO: task syz-executor.0:5485 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00344-g037266a5f723 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:26448 pid:5485  tgid:5484  ppid:5417   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 request_wait_answer+0x4f4/0x8f0 fs/fuse/dev.c:407
 __fuse_request_send fs/fuse/dev.c:426 [inline]
 fuse_simple_request+0x504/0xd20 fs/fuse/dev.c:513
 fuse_lookup_name+0x1df/0x580 fs/fuse/dir.c:386
 fuse_lookup+0x1ad/0x430 fs/fuse/dir.c:425
 __lookup_slow+0x24d/0x450 fs/namei.c:1694
 lookup_slow fs/namei.c:1711 [inline]
 walk_component+0x349/0x5a0 fs/namei.c:2002
 link_path_walk.part.0.constprop.0+0x71f/0xce0 fs/namei.c:2329
 link_path_walk fs/namei.c:2254 [inline]
 path_openat+0x23f/0x2c50 fs/namei.c:3775
 do_filp_open+0x1de/0x430 fs/namei.c:3809
 do_sys_openat2+0x176/0x1e0 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_openat fs/open.c:1471 [inline]
 __se_sys_openat fs/open.c:1466 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1466
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f76c9e7aa90
RSP: 002b:00007f76cac26c00 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000004000 RCX: 00007f76c9e7aa90
RDX: 0000000000004000 RSI: 00007f76cac26ca0 RDI: 00000000ffffff9c
RBP: 00007f76cac26ca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007f76c9f9bf80 R15: 00007ffdfc9d70c8
 </TASK>
INFO: task syz-executor.0:5490 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc1-syzkaller-00344-g037266a5f723 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:28864 pid:5490  tgid:5484  ppid:5417   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_write_slowpath kernel/locking/rwsem.c:1178 [inline]
 __down_write_common+0x948/0x1400 kernel/locking/rwsem.c:1306
 inode_lock_nested include/linux/fs.h:837 [inline]
 fuse_reverse_inval_entry+0x59/0x580 fs/fuse/dir.c:1351
 fuse_notify_delete fs/fuse/dev.c:1552 [inline]
 fuse_notify fs/fuse/dev.c:1801 [inline]
 fuse_dev_do_write+0xe94/0x2c90 fs/fuse/dev.c:1876
 fuse_dev_write+0x155/0x1e0 fs/fuse/dev.c:1960
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x64f/0xdf0 fs/read_write.c:584
 ksys_write+0x12f/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f76c9e7bdb9
RSP: 002b:00007f76cac060c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f76c9f9c050 RCX: 00007f76c9e7bdb9
RDX: 000000000000002c RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007f76c9ed8ad0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f76c9f9c050 R15: 00007ffdfc9d70c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613
2 locks held by getty/4817:
 #0: ffff888025c230a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.0/5417:
 #0: ffff8880768a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:812 [inline]
 #0: ffff8880768a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1710 [inline]
 #0: ffff8880768a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x33b/0x5a0 fs/namei.c:2002
2 locks held by syz-executor.0/5485:
 #0: ffff8880768a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:812 [inline]
 #0: ffff8880768a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1710 [inline]
 #0: ffff8880768a8150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x33b/0x5a0 fs/namei.c:2002
 #1: ffff8880768a85c8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xd2/0x110 fs/fuse/inode.c:492
2 locks held by syz-executor.0/5490:
 #0: ffff888073a5cb38 (&fc->killsb){.+.+}-{3:3}, at: fuse_notify_delete fs/fuse/dev.c:1551 [inline]
 #0: ffff888073a5cb38 (&fc->killsb){.+.+}-{3:3}, at: fuse_notify fs/fuse/dev.c:1801 [inline]
 #0: ffff888073a5cb38 (&fc->killsb){.+.+}-{3:3}, at: fuse_dev_do_write+0xe74/0x2c90 fs/fuse/dev.c:1876
 #1: ffff8880768a8150 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:837 [inline]
 #1: ffff8880768a8150 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: fuse_reverse_inval_entry+0x59/0x580 fs/fuse/dir.c:1351

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc1-syzkaller-00344-g037266a5f723 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4509 Comm: klogd Not tainted 6.7.0-rc1-syzkaller-00344-g037266a5f723 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__lock_acquire+0x6b/0x3b10 kernel/locking/lockdep.c:4992
Code: 98 00 00 00 85 13 96 8c 48 c7 84 24 a0 00 00 00 80 d0 67 81 48 89 44 24 18 48 8d 84 24 90 00 00 00 48 c1 e8 03 48 89 44 24 30 <48> 89 c6 48 b8 00 00 00 00 00 fc ff df 48 8d 14 06 c7 02 f1 f1 f1
RSP: 0018:ffffc9000312f5d8 EFLAGS: 00000012
RAX: 1ffff92000625ecd RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8d11bae0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff8f193657 R11: 0000000000000000 R12: ffffffff8d11bae0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f08a533e380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556b4eb6b600 CR3: 000000007b5a8000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5753 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5718
 __fs_reclaim_acquire mm/page_alloc.c:3693 [inline]
 fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707
 might_alloc include/linux/sched/mm.h:303 [inline]
 slab_pre_alloc_hook mm/slab.h:710 [inline]
 slab_alloc_node mm/slub.c:3460 [inline]
 __kmem_cache_alloc_node+0x51/0x310 mm/slub.c:3517
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc_node_track_caller+0x4a/0x90 mm/slab_common.c:1027
 kmalloc_reserve+0xef/0x260 net/core/skbuff.c:582
 __alloc_skb+0x12b/0x330 net/core/skbuff.c:651
 alloc_skb include/linux/skbuff.h:1286 [inline]
 alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6331
 sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2780
 unix_dgram_sendmsg+0x464/0x1ca0 net/unix/af_unix.c:1976
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 __sys_sendto+0x255/0x340 net/socket.c:2190
 __do_sys_sendto net/socket.c:2202 [inline]
 __se_sys_sendto net/socket.c:2198 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f08a54a09b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe072ab408 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f08a54a09b5
RDX: 000000000000003a RSI: 0000562bba44c1e0 RDI: 0000000000000003
RBP: 0000562bba447910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f08a562e212 R14: 00007ffe072ab508 R15: 0000000000000000
 </TASK>