__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: 1 PID: 25513 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
WARNING: CPU: 1 PID: 25513 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37
Modules linked in:
CPU: 1 PID: 25513 Comm: syz-executor.3 Not tainted 5.16.0-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 dd 7e a9 f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 28 20 62 f8 48 8b 74 24 10 4c 89 e7 e8 1b 30 36 00 <0f> 0b e9 c7 97 e8 fa 4c 89 ff e8 ac 7e a9 f8 e9 d4 fe ff ff e8 92
RSP: 0018:ffffc90000dc0da0 EFLAGS: 00010206
RAX: 0000000000000100 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000101 RSI: 0000000000000101 RDI: 0000000000000001
RBP: ffff888078389c18 R08: 0000000000000001 R09: ffffffff8ffa2a9f
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888078389bd0
R13: ffff888078389c18 R14: ffff888078389c18 R15: ffff888078389c18
FS:  00007f6612c81700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c56cb1fc0 CR3: 0000000073df1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0x6d2/0x920 net/core/sock.c:2042
 rcu_do_batch kernel/rcu/tree.c:2506 [inline]
 rcu_core+0x7ab/0x14a0 kernel/rcu/tree.c:2741
 __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:arch_stack_walk+0x87/0xe0 arch/x86/kernel/stacktrace.c:26
Code: 95 78 ff ff ff 85 d2 75 21 eb 33 4c 89 e7 ff d3 84 c0 74 2a 48 8d bd 78 ff ff ff e8 53 81 07 00 8b 85 78 ff ff ff 85 c0 74 14 <48> 8d bd 78 ff ff ff e8 3d 7e 07 00 48 85 c0 48 89 c6 75 cd 48 8b
RSP: 0018:ffffc9000574f450 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff81658440 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffc9000574fce0 RDI: 0000000000000001
RBP: ffffc9000574f4d8 R08: ffffffff8e201f02 R09: 0000000000000001
R10: fffff52000ae9e95 R11: 000000000008808a R12: ffffc9000574f508
R13: 0000000000000000 R14: ffff88804d61ba00 R15: 0000000000408d40
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:738 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:706 [inline]
 alloc_buffer_head+0x20/0x140 fs/buffer.c:3309
 alloc_page_buffers+0x268/0x5f0 fs/buffer.c:832
 create_empty_buffers+0x2c/0x800 fs/buffer.c:1560
 ext4_block_write_begin+0xd1d/0x1140 fs/ext4/inode.c:1060
 ext4_da_write_begin+0x3eb/0xad0 fs/ext4/inode.c:2966
 generic_perform_write+0x205/0x510 mm/filemap.c:3754
 ext4_buffered_write_iter+0x1ac/0x3b0 fs/ext4/file.c:269
 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:681
 call_write_iter include/linux/fs.h:2162 [inline]
 new_sync_write+0x429/0x660 fs/read_write.c:503
 vfs_write+0x7cd/0xae0 fs/read_write.c:590
 ksys_write+0x12d/0x250 fs/read_write.c:643
 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: 0033:0x7f661430c059
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6612c81168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f661441ef60 RCX: 00007f661430c059
RDX: 0000000000400086 RSI: 0000000020000200 RDI: 0000000000000006
RBP: 00007f661436608d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe0031e15f R14: 00007f6612c81300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess), 4 bytes skipped:
   0:	ff 85 d2 75 21 eb    	incl   -0x14de8a2e(%rbp)
   6:	33 4c 89 e7          	xor    -0x19(%rcx,%rcx,4),%ecx
   a:	ff d3                	callq  *%rbx
   c:	84 c0                	test   %al,%al
   e:	74 2a                	je     0x3a
  10:	48 8d bd 78 ff ff ff 	lea    -0x88(%rbp),%rdi
  17:	e8 53 81 07 00       	callq  0x7816f
  1c:	8b 85 78 ff ff ff    	mov    -0x88(%rbp),%eax
  22:	85 c0                	test   %eax,%eax
  24:	74 14                	je     0x3a
* 26:	48 8d bd 78 ff ff ff 	lea    -0x88(%rbp),%rdi <-- trapping instruction
  2d:	e8 3d 7e 07 00       	callq  0x77e6f
  32:	48 85 c0             	test   %rax,%rax
  35:	48 89 c6             	mov    %rax,%rsi
  38:	75 cd                	jne    0x7
  3a:	48                   	rex.W
  3b:	8b                   	.byte 0x8b