------------[ cut here ]------------
WARNING: CPU: 0 PID: 12165 at net/ipv4/ipmr.c:2302 ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302
Modules linked in:
CPU: 0 UID: 0 PID: 12165 Comm: syz.4.2111 Not tainted 6.16.0-rc2-syzkaller-00623-g14966a8df77e #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 2e 16 c6 f7 48 8b 74 24 18 45 31 f6 31 ff ba 02 00 00 00 e8 7a 0b 4c ff e9 45 f6 ff ff e8 10 16 c6 f7 90 <0f> 0b 90 e9 94 f5 ff ff e8 02 16 c6 f7 90 0f 0b 90 42 80 3c 2b 00
RSP: 0000:ffffc900044df840 EFLAGS: 00010246
RAX: ffffffff89fa4640 RBX: ffff888032758b40 RCX: ffff8880279c8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900044df950 R08: ffff8880279c8000 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff89fa3a90 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff8880337a2600 R15: 0000000000000000
FS:  0000555569ba7500(0000) GS:ffff888125c4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2ff7fe CR3: 000000007b7ca000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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+0x57/0xc0 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0033:0x7f460e84da01
Code: 39 d0 75 dc 48 89 f0 25 ff 1f 00 00 49 89 34 c1 41 88 3c 00 31 c0 c3 66 90 41 38 3c 10 74 0b 41 88 3c 10 31 c0 49 89 34 d1 c3 <b8> 01 00 00 00 c3 66 0f 1f 84 00 00 00 00 00 48 83 ec 18 48 89 7c
RSP: 002b:00007ffc0b019618 EFLAGS: 00000246
RAX: 00000000899739d4 RBX: 00007f460f6e5720 RCX: ffffffff899739d3
RDX: 00000000000019d4 RSI: ffffffff899739d3 RDI: 0000000000000001
RBP: ffffffff899739d3 R08: 00007f460eba0000 R09: 00007f460eba2000
R10: 00000000899739d7 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff899735db R15: 0000000000020cc6
 </TASK>