INFO: task syz-executor.0:9694 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc4-syzkaller-00003-g716f4aaa7b48 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:28152 pid:9694  tgid:9687  ppid:5433   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x49a0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6874
 rwsem_down_read_slowpath kernel/locking/rwsem.c:1086 [inline]
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x703/0xa40 kernel/locking/rwsem.c:1528
 inode_lock_shared include/linux/fs.h:812 [inline]
 lookup_slow+0x45/0x70 fs/namei.c:1709
 walk_component+0x2e1/0x410 fs/namei.c:2001
 lookup_last fs/namei.c:2458 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2482
 filename_lookup+0x255/0x610 fs/namei.c:2511
 do_linkat+0x182/0x760 fs/namei.c:4655
 __do_sys_linkat fs/namei.c:4703 [inline]
 __se_sys_linkat fs/namei.c:4700 [inline]
 __x64_sys_linkat+0xdd/0xf0 fs/namei.c:4700
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f4444a7cda9
RSP: 002b:00007f444572d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000109
RAX: ffffffffffffffda RBX: 00007f4444bac050 RCX: 00007f4444a7cda9
RDX: 0000000000000005 RSI: 0000000020000040 RDI: 0000000000000005
RBP: 00007f4444ac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f4444bac050 R15: 00007ffd5aa2c3c8
 </TASK>

Showing all locks held in the system:
1 lock held by ksoftirqd/0/16:
1 lock held by khungtaskd/29:
 #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4810:
 #0: ffff88802b5140a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.4/5428:
 #0: ffff88802a9acd88 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x4c/0x3b0 net/netfilter/x_tables.c:1242
1 lock held by syz-executor.1/5429:
3 locks held by kworker/u5:5/5439:
 #0: ffff888022c9e938 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #0: ffff888022c9e938 ((wq_completion)hci6){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
 #1: ffffc90004ecfd20 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #1: ffffc90004ecfd20 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
 #2: ffff88805b7c1060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1ec/0x400 net/bluetooth/hci_sync.c:305
3 locks held by syz-executor.0/9688:
1 lock held by syz-executor.0/9694:
 #0: ffff8880681282b8 (&sb->s_type->i_mutex_key#21){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:812 [inline]
 #0: ffff8880681282b8 (&sb->s_type->i_mutex_key#21){++++}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
4 locks held by syz-executor.0/20050:

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc4-syzkaller-00003-g716f4aaa7b48 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5428 Comm: syz-executor.4 Not tainted 6.8.0-rc4-syzkaller-00003-g716f4aaa7b48 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x70 kernel/kcov.c:207
Code: 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 70 53 70 7e 65 8b 15 71 53 70 7e <f7> c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 fc 15 00 00
RSP: 0000:ffffc90004dd7d10 EFLAGS: 00000202
RAX: ffffffff8b51ea72 RBX: 0000000000000001 RCX: ffff88802b398000
RDX: 0000000080000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004dd7e40 R08: ffffffff8b51ea60 R09: 1ffffffff258aa84
R10: dffffc0000000000 R11: fffffbfff258aa85 R12: ffff88802e03d61e
R13: dffffc0000000000 R14: ffffc90004dd7e78 R15: ffffc90004dd7e58
FS:  00005555562eb480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8752da7fc CR3: 000000002e188000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 mas_root lib/maple_tree.c:832 [inline]
 mas_start+0x252/0x5a0 lib/maple_tree.c:1362
 mas_state_walk lib/maple_tree.c:3673 [inline]
 mas_walk+0x49/0x280 lib/maple_tree.c:4861
 lock_vma_under_rcu+0x231/0x730 mm/memory.c:5602
 do_user_addr_fault arch/x86/mm/fault.c:1356 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x185/0x870 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7fb8746591e8
Code: 55 48 8d 2d 9a 54 12 00 53 48 89 eb 66 0f 1f 44 00 00 44 89 e0 87 03 83 f8 01 7f 26 48 8b 9b 70 08 00 00 48 39 eb 75 ea 31 c0 <87> 05 0e 16 c8 00 83 f8 01 7f 25 5b 5d 41 5c c3 0f 1f 84 00 00 00
RSP: 002b:00007fff1fe0d580 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007fb87477e660 RCX: 00007fb874679dd3
RDX: 00000000000009b3 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fb87477e660 R08: 0000000000000000 R09: 0000000000000000
R10: 00005555562eb750 R11: 0000000000000246 R12: 0000000000000000
R13: ffffffffffffffb0 R14: 0000000000000006 R15: 0000000000000000
 </TASK>