__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: 3626 at lib/ref_tracker.c:38 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
WARNING: CPU: 1 PID: 3626 at lib/ref_tracker.c:38 ref_tracker_dir_exit.cold+0x137/0x1e3 lib/ref_tracker.c:37
Modules linked in:
CPU: 1 PID: 3626 Comm: syz-executor.5 Not tainted 5.16.0-rc8-next-20220110-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 a2 45 9e f8 4c 8b 3c 24 4c 39 fd 49 8b 07 0f 85 b5 00 00 00 e8 4d 57 53 f8 48 8b 74 24 10 4c 89 e7 e8 10 25 37 00 <0f> 0b e9 1c c7 e6 fa 4c 89 ff e8 71 45 9e f8 e9 d4 fe ff ff e8 57
RSP: 0018:ffffc90000dc0db8 EFLAGS: 00010202
RAX: 0000000000000101 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffff888075cf1c18 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817eb2f8 R11: 0000000000000001 R12: ffff888075cf1bd0
R13: ffff888075cf1c18 R14: ffff888075cf1c18 R15: ffff888075cf1c18
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f51a6a47fb8 CR3: 0000000014d9a000 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+0x5f7/0x710 net/core/sock.c:2042
 rcu_do_batch kernel/rcu/tree.c:2536 [inline]
 rcu_core+0x7b8/0x1540 kernel/rcu/tree.c:2787
 __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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 ba 06 01 f8 48 89 ef e8 72 7c 01 f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 73 36 f4 f7 65 8b 05 6c 37 a6 76 85 c0 74 0a 5b 5d c3 e8 60 7a
RSP: 0018:ffffc9000277fb58 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1b28aa9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff907c14b8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817eb2f8 R11: 0000000000000001 R12: 1ffffffff20f8296
R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000
 __debug_check_no_obj_freed lib/debugobjects.c:1002 [inline]
 debug_check_no_obj_freed+0x20c/0x420 lib/debugobjects.c:1023
 free_pages_prepare mm/page_alloc.c:1358 [inline]
 free_pcp_prepare+0x2be/0xb60 mm/page_alloc.c:1404
 free_unref_page_prepare mm/page_alloc.c:3325 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3404
 __vunmap+0x854/0xd30 mm/vmalloc.c:2637
 __vfree+0x3c/0xd0 mm/vmalloc.c:2685
 vfree+0x5a/0x90 mm/vmalloc.c:2716
 kcov_put kernel/kcov.c:411 [inline]
 kcov_put+0x26/0x40 kernel/kcov.c:407
 kcov_close+0xc/0x10 kernel/kcov.c:513
 __fput+0x286/0x9f0 fs/file_table.c:311
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xb31/0x2b10 kernel/exit.c:793
 do_group_exit+0x128/0x330 kernel/exit.c:931
 __do_sys_exit_group kernel/exit.c:942 [inline]
 __se_sys_exit_group kernel/exit.c:940 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:940
 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: 0033:0x7f51a6962e99
Code: Unable to access opcode bytes at RIP 0x7f51a6962e6f.
RSP: 002b:00007ffc24ef5538 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000010badf00d RCX: 00007f51a6962e99
RDX: 00007f51a6915973 RSI: 000000000000000c RDI: 0000000000000000
RBP: 00000000ffffffff R08: 000000000000001a R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00007ffc24ef5630 R14: 00007f51a6a764d8 R15: 0000000000000006
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 24                	je     0x26
   2:	10 e8                	adc    %ch,%al
   4:	ba 06 01 f8 48       	mov    $0x48f80106,%edx
   9:	89 ef                	mov    %ebp,%edi
   b:	e8 72 7c 01 f8       	callq  0xf8017c82
  10:	81 e3 00 02 00 00    	and    $0x200,%ebx
  16:	75 25                	jne    0x3d
  18:	9c                   	pushfq
  19:	58                   	pop    %rax
  1a:	f6 c4 02             	test   $0x2,%ah
  1d:	75 2d                	jne    0x4c
  1f:	48 85 db             	test   %rbx,%rbx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 73 36 f4 f7       	callq  0xf7f436a2 <-- trapping instruction
  2f:	65 8b 05 6c 37 a6 76 	mov    %gs:0x76a6376c(%rip),%eax        # 0x76a637a2
  36:	85 c0                	test   %eax,%eax
  38:	74 0a                	je     0x44
  3a:	5b                   	pop    %rbx
  3b:	5d                   	pop    %rbp
  3c:	c3                   	retq
  3d:	e8                   	.byte 0xe8
  3e:	60                   	(bad)
  3f:	7a                   	.byte 0x7a