------------[ cut here ]------------
WARNING: net/ipv4/ipmr.c:2302 at ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302, CPU#1: syz-executor/5827
Modules linked in:
CPU: 1 UID: 0 PID: 5827 Comm: syz-executor Not tainted 6.16.0-rc3-next-20250627-syzkaller #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 1e 18 be f7 48 8b 74 24 18 45 31 f6 31 ff ba 02 00 00 00 e8 0a fe 4b ff e9 45 f6 ff ff e8 00 18 be f7 90 <0f> 0b 90 e9 94 f5 ff ff e8 f2 17 be f7 90 0f 0b 90 42 80 3c 2b 00
RSP: 0018:ffffc90000a08900 EFLAGS: 00010246
RAX: ffffffff8a01ba60 RBX: ffff88802f852640 RCX: ffff88802e861e00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a08a10 R08: ffff88802e861e00 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff8a01aeb0 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff88803ffb0a00 R15: 0000000000000000
FS:  0000555566ecc500(0000) GS:ffff888125d1e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faeacd81178 CR3: 0000000077d64000 CR4: 00000000003526f0
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+0x17b/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:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 5b 83 02 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000403fbf8 EFLAGS: 00000206
RAX: d6ec501c3a4e3b00 RBX: 0000000000000000 RCX: d6ec501c3a4e3b00
RDX: 0000000000000000 RSI: ffffffff8db80736 RDI: ffffffff8be31f80
RBP: ffffffff89e3f3cd R08: 0000000000000000 R09: ffffffff89e3f3cd
R10: dffffc0000000000 R11: ffffffff89e3f3b0 R12: 0000000000000000
R13: ffff88802f4ae0d8 R14: 0000000000000001 R15: 0000000000000246
 lock_sock_nested+0x48/0x100 net/core/sock.c:3727
 lock_sock include/net/sock.h:1667 [inline]
 tcp_close+0x1d/0x110 net/ipv4/tcp.c:3276
 inet_release+0x184/0x210 net/ipv4/af_inet.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xc0/0x240 net/socket.c:1439
 __fput+0x44c/0xa70 fs/file_table.c:468
 fput_close_sync+0x119/0x200 fs/file_table.c:573
 __do_sys_close fs/open.c:1586 [inline]
 __se_sys_close fs/open.c:1571 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1571
 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: 0033:0x7faeacb8d58a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 43 91 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 a3 91 02 00 8b 44 24
RSP: 002b:00007ffc12e36b90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007faeacb8d58a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffc12e36bec R08: 00000000000003b8 R09: 0079746972756365
R10: 00007faeacd817e0 R11: 0000000000000293 R12: 000000000000008c
R13: 00000000000927c0 R14: 000000000006296b R15: 00007ffc12e36c40
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	9c                   	pushf
   5:	8f 44 24 30          	pop    0x30(%rsp)
   9:	f7 44 24 30 00 02 00 	testl  $0x200,0x30(%rsp)
  10:	00
  11:	0f 85 cd 00 00 00    	jne    0xe4
  17:	f7 44 24 08 00 02 00 	testl  $0x200,0x8(%rsp)
  1e:	00
  1f:	74 01                	je     0x22
  21:	fb                   	sti
  22:	65 48 8b 05 5b 83 02 	mov    %gs:0x1102835b(%rip),%rax        # 0x11028385
  29:	11
* 2a:	48 3b 44 24 58       	cmp    0x58(%rsp),%rax <-- trapping instruction
  2f:	0f 85 f2 00 00 00    	jne    0x127
  35:	48 83 c4 60          	add    $0x60,%rsp
  39:	5b                   	pop    %rbx
  3a:	41 5c                	pop    %r12
  3c:	41 5d                	pop    %r13
  3e:	41 5e                	pop    %r14