INFO: task syz-executor.3:23454 blocked for more than 147 seconds.
      Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:24720 pid:23454 tgid:23452 ppid:21194  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x177f/0x4960 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 __lock_sock+0x1cc/0x330 net/core/sock.c:2949
 lock_sock_nested+0x9e/0x100 net/core/sock.c:3529
 lock_sock include/net/sock.h:1691 [inline]
 tcp_recvmsg+0x23b/0x920 net/ipv4/tcp.c:2566
 inet_recvmsg+0x13f/0x250 net/ipv4/af_inet.c:882
 sock_recvmsg_nosec+0x86/0xd0 net/socket.c:1046
 ____sys_recvmsg+0x483/0x580 net/socket.c:2801
 ___sys_recvmsg net/socket.c:2845 [inline]
 do_recvmmsg+0x474/0xae0 net/socket.c:2939
 __sys_recvmmsg net/socket.c:3018 [inline]
 __do_sys_recvmmsg net/socket.c:3041 [inline]
 __se_sys_recvmmsg net/socket.c:3034 [inline]
 __x64_sys_recvmmsg+0x199/0x240 net/socket.c:3034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f25fb27cda9
RSP: 002b:00007f25fc0650c8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f25fb3abf80 RCX: 00007f25fb27cda9
RDX: 000000003fffffff RSI: 0000000020001840 RDI: 0000000000000008
RBP: 00007f25fb2c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f25fb3abf80 R15: 00007fffd8222318
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d92f120 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8d92f120 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8d92f120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4798:
 #0: ffff888029a400a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
2 locks held by kworker/0:7/5113:
 #0: ffff88801308a938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #0: ffff88801308a938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
 #1: ffffc90003dffd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #1: ffffc90003dffd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
3 locks held by kworker/u4:10/5245:
1 lock held by syz-executor.3/23454:
 #0: ffff888031dcef70 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]
 #0: ffff888031dcef70 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_recvmsg+0x23b/0x920 net/ipv4/tcp.c:2566
3 locks held by syz-executor.3/23457:
2 locks held by syz-executor.2/24945:
 #0: ffff88804ffbf410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #0: ffff88804ffbf410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline]
 #0: ffff88804ffbf410 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: sock_close+0x90/0x230 net/socket.c:1421
 #1: ffffffff8d934ab8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
 #1: ffffffff8d934ab8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:995
2 locks held by syz-executor.1/24955:
 #0: ffff8880b983c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:567
 #1: ffff8880b9928988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x310 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+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 24964 Comm: syz-executor.3 Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:task_irq_context kernel/locking/lockdep.c:4607 [inline]
RIP: 0010:__lock_acquire+0x3b9/0x1fd0 kernel/locking/lockdep.c:5074
Code: 48 89 df e8 79 52 7e 00 4c 8b 44 24 08 48 be 00 00 00 00 00 fc ff df 48 8b 84 24 c8 00 00 00 48 89 9c 24 80 00 00 00 48 89 03 <65> 8b 05 fc f0 94 7e 31 db 85 c0 0f 95 c3 01 db 48 8b 44 24 50 48
RSP: 0000:ffffc90004adf0d0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff888022b40b50 RCX: ffffffff925f3303
RDX: 0000000000000003 RSI: dffffc0000000000 RDI: 0000000000000018
RBP: 000000000000000f R08: ffff888022b40ac0 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e0490e R12: ffffffff8d92f0a0
R13: 0000000000000018 R14: 000000000000000f R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdd4e901401 CR3: 000000000d732000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
 rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:842 [inline]
 pfn_valid+0x113/0x440 include/linux/mmzone.h:2016
 page_table_check_clear+0x21/0x720 mm/page_table_check.c:68
 zap_pte_range mm/memory.c:1452 [inline]
 zap_pmd_range mm/memory.c:1597 [inline]
 zap_pud_range mm/memory.c:1626 [inline]
 zap_p4d_range mm/memory.c:1647 [inline]
 unmap_page_range+0x1f79/0x3600 mm/memory.c:1668
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1758
 exit_mmap+0x2c6/0xd30 mm/mmap.c:3279
 __mmput+0x115/0x3c0 kernel/fork.c:1343
 exit_mm+0x21f/0x300 kernel/exit.c:569
 do_exit+0x9af/0x2740 kernel/exit.c:858
 do_group_exit+0x206/0x2c0 kernel/exit.c:1020
 get_signal+0x1769/0x1840 kernel/signal.c:2893
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xc8/0x370 kernel/entry/common.c:212
 do_syscall_64+0x102/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f63c207cda9
Code: Unable to access opcode bytes at 0x7f63c207cd7f.
RSP: 002b:00007f63c2dfb178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f63c21abf88 RCX: 00007f63c207cda9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f63c21abf88
RBP: 00007f63c21abf80 R08: 00007f63c2dfb6c0 R09: 00007f63c2dfb6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f63c21abf8c
R13: 000000000000000b R14: 00007ffee4bfd7c0 R15: 00007ffee4bfd8a8
 </TASK>