__sys_sendmmsg+0x195/0x470 net/socket.c:2553
 __do_sys_sendmmsg net/socket.c:2582 [inline]
 __se_sys_sendmmsg net/socket.c:2579 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
------------[ cut here ]------------
WARNING: CPU: 0 PID: 18493 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
WARNING: CPU: 0 PID: 18493 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37
Modules linked in:
CPU: 0 PID: 18493 Comm: syz-executor.0 Not tainted 5.16.0-next-20220111-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:38
Code: 4c 89 ef e8 c1 0a 9e f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 0c 1d 53 f8 48 8b 74 24 10 4c 89 e7 e8 9f 28 37 00 <0f> 0b e9 4b 56 e6 fa 4c 89 ff e8 90 0a 9e f8 e9 d4 fe ff ff e8 76
RSP: 0018:ffffc90000007d28 EFLAGS: 00010206
RAX: 0000000000000100 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000101 RSI: 0000000000000101 RDI: 0000000000000001
RBP: ffff88807e599c18 R08: 0000000000000001 R09: ffffffff8ffd2977
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88807e599bd0
R13: ffff88807e599c18 R14: ffff88807e599c18 R15: ffff88807e599c18
FS:  00007f977ab3e700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c012c24150 CR3: 000000007d605000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __put_net+0x15/0x70 net/core/net_namespace.c:640
 put_net include/net/net_namespace.h:268 [inline]
 put_net_track include/net/net_namespace.h:342 [inline]
 __sk_destruct+0x5f7/0x710 net/core/sock.c:2042
 sk_destruct+0xbd/0xe0 net/core/sock.c:2058
 __sk_free+0xef/0x3d0 net/core/sock.c:2069
 sk_free+0x78/0xa0 net/core/sock.c:2080
 deferred_put_nlk_sk+0x151/0x2f0 net/netlink/af_netlink.c:743
 rcu_do_batch kernel/rcu/tree.c:2527 [inline]
 rcu_core+0x7b8/0x1540 kernel/rcu/tree.c:2778
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5607
Code: 31 a5 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc900037073f8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff920006e0e81 RCX: c7852dbb1bf7c535
RDX: 1ffff1100f8614f4 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ffd2947
R10: fffffbfff1ffa528 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8bb839e0 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:268 [inline]
 rcu_read_lock include/linux/rcupdate.h:694 [inline]
 page_evictable+0x38/0x510 mm/internal.h:132
 shrink_page_list+0x4e7/0x65f0 mm/vmscan.c:1551
 reclaim_pages+0x48e/0x1160 mm/vmscan.c:2636
 madvise_cold_or_pageout_pte_range+0x120e/0x3150 mm/madvise.c:421
 walk_pmd_range mm/pagewalk.c:128 [inline]
 walk_pud_range mm/pagewalk.c:205 [inline]
 walk_p4d_range mm/pagewalk.c:240 [inline]
 walk_pgd_range mm/pagewalk.c:277 [inline]
 __walk_page_range+0xe23/0x1ea0 mm/pagewalk.c:379
 walk_page_range+0x20d/0x400 mm/pagewalk.c:475
 madvise_pageout_page_range mm/madvise.c:562 [inline]
 madvise_pageout+0x215/0x3f0 mm/madvise.c:599
 madvise_vma_behavior+0xaac/0x1fa0 mm/madvise.c:988
 madvise_walk_vmas mm/madvise.c:1207 [inline]
 do_madvise mm/madvise.c:1385 [inline]
 do_madvise+0x3d6/0x660 mm/madvise.c:1343
 __do_sys_madvise mm/madvise.c:1398 [inline]
 __se_sys_madvise mm/madvise.c:1396 [inline]
 __x64_sys_madvise+0xa6/0x110 mm/madvise.c:1396
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f977c1c8e99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f977ab3e168 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f977c2dbf60 RCX: 00007f977c1c8e99
RDX: 0000000000000015 RSI: 0000000000400000 RDI: 0000000020495000
RBP: 00007f977c222ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd822920cf R14: 00007f977ab3e300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	31 a5 7e 83 f8 01    	xor    %esp,0x1f8837e(%rbp)
   6:	0f 85 b4 02 00 00    	jne    0x2c0
   c:	9c                   	pushfq
   d:	58                   	pop    %rax
   e:	f6 c4 02             	test   $0x2,%ah
  11:	0f 85 9f 02 00 00    	jne    0x2b6
  17:	48 83 7c 24 08 00    	cmpq   $0x0,0x8(%rsp)
  1d:	74 01                	je     0x20
  1f:	fb                   	sti
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	48 01 c3             	add    %rax,%rbx <-- trapping instruction
  2d:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
  34:	48 c7 43 08 00 00 00 	movq   $0x0,0x8(%rbx)
  3b:	00
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	84                   	.byte 0x84
  3f:	24                   	.byte 0x24