------------[ cut here ]------------
WARNING: CPU: 1 PID: 14103 at net/ipv4/ipmr.c:2302 ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302
Modules linked in:
CPU: 1 UID: 0 PID: 14103 Comm: syz-executor Not tainted 6.16.0-rc1-syzkaller-00482-gafc783fa0aab #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 fe 71 c6 f7 48 8b 74 24 18 45 31 f6 31 ff ba 02 00 00 00 e8 3a 11 4c ff e9 45 f6 ff ff e8 e0 71 c6 f7 90 <0f> 0b 90 e9 94 f5 ff ff e8 d2 71 c6 f7 90 0f 0b 90 42 80 3c 2b 00
RSP: 0018:ffffc90000a08900 EFLAGS: 00010246
RAX: ffffffff89f9ed10 RBX: ffff88805a7293c0 RCX: ffff8880268c5a00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a08a10 R08: ffff8880268c5a00 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff89f9e160 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff888078a17000 R15: 0000000000000000
FS:  000055555c6b0500(0000) GS:ffff888125d52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f339577e2d8 CR3: 00000000750dc000 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:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 44 35 fa 0b 48 89 de 5b e9 f3 b0 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 e0 9c 92 65 8b 15 28 81 dc 10 81 e2 00 01 ff 00
RSP: 0018:ffffc9000447fc60 EFLAGS: 00000297
RAX: ffffffff899463d9 RBX: ffffffff8f600260 RCX: ffffffff8b67712d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000447fbe0
RBP: ffffffff8f600298 R08: ffffc9000447fbe7 R09: 1ffff9200088ff7c
R10: dffffc0000000000 R11: fffff5200088ff7d R12: 0000000000000041
R13: dffffc0000000000 R14: 1ffffffff1ec0053 R15: 0000000000000044
 nf_getsockopt+0x239/0x290 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x1c4/0x220 net/ipv4/ip_sockglue.c:1777
 do_sock_getsockopt+0x35d/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: 0033:0x7f339559066a
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:00007ffee7717da8 EFLAGS: 00000216 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffee7717e30 RCX: 00007f339559066a
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffee7717dcc R09: 0079746972756365
R10: 00007ffee7717e30 R11: 0000000000000216 R12: 00007f3395783940
R13: 00007ffee7717dcc R14: 0000000000000000 R15: 00007f3395784000
 </TASK>
----------------
Code disassembly (best guess):
   0:	8b 3d 44 35 fa 0b    	mov    0xbfa3544(%rip),%edi        # 0xbfa354a
   6:	48 89 de             	mov    %rbx,%rsi
   9:	5b                   	pop    %rbx
   a:	e9 f3 b0 58 00       	jmp    0x58b102
   f:	cc                   	int3
  10:	cc                   	int3
  11:	cc                   	int3
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	f3 0f 1e fa          	endbr64
  26:	48 8b 04 24          	mov    (%rsp),%rax
* 2a:	65 48 8b 0c 25 08 e0 	mov    %gs:0xffffffff929ce008,%rcx <-- trapping instruction
  31:	9c 92
  33:	65 8b 15 28 81 dc 10 	mov    %gs:0x10dc8128(%rip),%edx        # 0x10dc8162
  3a:	81 e2 00 01 ff 00    	and    $0xff0100,%edx