------------[ cut here ]------------
WARNING: CPU: 1 PID: 5849 at net/ipv4/ipmr.c:2302 ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302
Modules linked in:
CPU: 1 UID: 0 PID: 5849 Comm: syz-executor Not tainted 6.16.0-rc2-syzkaller-00592-g0289c51f889e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302
Code: df e9 63 f6 ff ff e8 ce 33 c6 f7 48 8b 74 24 18 45 31 f6 31 ff ba 02 00 00 00 e8 9a 09 4c ff e9 45 f6 ff ff e8 b0 33 c6 f7 90 <0f> 0b 90 e9 94 f5 ff ff e8 a2 33 c6 f7 90 0f 0b 90 42 80 3c 2b 00
RSP: 0018:ffffc90000a08900 EFLAGS: 00010246
RAX: ffffffff89fa28a0 RBX: ffff888031736b40 RCX: ffff88807bea0000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a08a10 R08: ffff88807bea0000 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff89fa1cf0 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff888054088200 R15: 0000000000000000
FS:  0000555586e94500(0000) GS:ffff888125d4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc168d7e2d8 CR3: 0000000032e66000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 igmp_send_report+0x89e/0xdb0 net/ipv4/igmp.c:799
 igmp_timer_expire+0x204/0x510 net/ipv4/igmp.c:-1
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 ab fc 5e f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 53 e8 27 f6 65 8b 05 3c 24 34 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc900047df700 EFLAGS: 00000206
RAX: 16b4b07ec8403a00 RBX: 0000000000000a02 RCX: 16b4b07ec8403a00
RDX: 0000000000000006 RSI: ffffffff8d984a0d RDI: 0000000000000001
RBP: ffffc900047df790 R08: ffffffff8fa11ff7 R09: 1ffffffff1f423fe
R10: dffffc0000000000 R11: fffffbfff1f423ff R12: dffffc0000000000
R13: ffff888056d97000 R14: ffffffff99d66540 R15: 1ffff920008fbee0
 __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
 debug_check_no_obj_freed+0x451/0x470 lib/debugobjects.c:1129
 free_pages_prepare mm/page_alloc.c:1255 [inline]
 __free_frozen_pages+0x509/0xe70 mm/page_alloc.c:2706
 vfree+0x25a/0x400 mm/vmalloc.c:3426
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:882 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
 do_ip6t_get_ctl+0xeb0/0x1180 net/ipv6/netfilter/ip6_tables.c:1677
 nf_getsockopt+0x26e/0x290 net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0x1ed/0x290 net/ipv6/ipv6_sockglue.c:1493
 do_sock_getsockopt+0x360/0x650 net/socket.c:2403
 __sys_getsockopt net/socket.c:2432 [inline]
 __do_sys_getsockopt net/socket.c:2439 [inline]
 __se_sys_getsockopt net/socket.c:2436 [inline]
 __x64_sys_getsockopt+0x1a5/0x250 net/socket.c:2436
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc168b9066a
Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007ffddc8b8e08 EFLAGS: 00000216 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffddc8b8e90 RCX: 00007fc168b9066a
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffddc8b8e2c R09: 0079746972756365
R10: 00007ffddc8b8e90 R11: 0000000000000216 R12: 00007fc168d80340
R13: 00007ffddc8b8e2c R14: 0000000000000000 R15: 00007fc168d81e40
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 05                	je     0x7
   2:	e8 ab fc 5e f6       	call   0xf65efcb2
   7:	48 c7 44 24 20 00 00 	movq   $0x0,0x20(%rsp)
   e:	00 00
  10:	9c                   	pushf
  11:	8f 44 24 20          	pop    0x20(%rsp)
  15:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
  1a:	75 4f                	jne    0x6b
  1c:	f7 c3 00 02 00 00    	test   $0x200,%ebx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 53 e8 27 f6       	call   0xf627e882 <-- trapping instruction
  2f:	65 8b 05 3c 24 34 07 	mov    %gs:0x734243c(%rip),%eax        # 0x7342472
  36:	85 c0                	test   %eax,%eax
  38:	74 40                	je     0x7a
  3a:	48                   	rex.W
  3b:	c7                   	.byte 0xc7
  3c:	04 24                	add    $0x24,%al
  3e:	0e                   	(bad)
  3f:	36                   	ss