------------[ cut here ]------------
WARNING: net/ipv4/ipmr.c:2302 at ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302, CPU#0: syz-executor/5817
Modules linked in:
CPU: 0 UID: 0 PID: 5817 Comm: syz-executor Not tainted 6.16.0-rc2-next-20250620-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 2e 47 bf f7 48 8b 74 24 18 45 31 f6 31 ff ba 02 00 00 00 e8 1a 08 4c ff e9 45 f6 ff ff e8 10 47 bf f7 90 <0f> 0b 90 e9 94 f5 ff ff e8 02 47 bf f7 90 0f 0b 90 42 80 3c 2b 00
RSP: 0018:ffffc90000007900 EFLAGS: 00010246
RAX: ffffffff8a0111d0 RBX: ffff888057895140 RCX: ffff888030d6da00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007a10 R08: ffff888030d6da00 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff8a010620 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff88805e470900 R15: 0000000000000000
FS:  000055558c85d500(0000) GS:ffff888125c26000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f47b8c08000 CR3: 000000005e796000 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:should_fail_ex+0x44/0x560 lib/fault-inject.c:146
Code: fb 49 bc 00 00 00 00 00 fc ff df 65 8b 05 a4 2d a5 0d a9 00 01 ff 00 0f 84 ee 00 00 00 49 89 dd 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 48 89 df e8 12 11 2a fd 48 83 3b 00 0f 84 18 01 00 00 4c 8d
RSP: 0018:ffffc90004127360 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8e261580 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8e261580
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff82173d1d
R10: ffffc90004127460 R11: fffff52000824e91 R12: dffffc0000000000
R13: 1ffffffff1c4c2b0 R14: 0000000000000001 R15: ffff888030d6efe4
 prepare_alloc_pages+0x213/0x610 mm/page_alloc.c:4734
 __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:4948
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
 alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline]
 alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2510
 get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5018
 poll_get_entry fs/select.c:168 [inline]
 __pollwait+0x27b/0x460 fs/select.c:223
 poll_wait include/linux/poll.h:45 [inline]
 pipe_poll+0xe0/0x470 fs/pipe.c:674
 vfs_poll include/linux/poll.h:82 [inline]
 select_poll_one fs/select.c:480 [inline]
 do_select+0x105e/0x17e0 fs/select.c:536
 core_sys_select+0x6dd/0xa20 fs/select.c:677
 do_pselect fs/select.c:759 [inline]
 __do_sys_pselect6 fs/select.c:802 [inline]
 __se_sys_pselect6+0x27a/0x300 fs/select.c:793
 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: 0033:0x7f47bc38e6ec
Code: 29 44 24 30 80 3d 6b 6e 1f 00 00 4c 89 4c 24 40 4c 8d 4c 24 40 48 c7 44 24 48 08 00 00 00 74 2e 4c 89 ea b8 0e 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7c 48 8b 54 24 58 64 48 2b 14 25 28 00 00 00
RSP: 002b:00007ffcdd91ae20 EFLAGS: 00000202 ORIG_RAX: 000000000000010e
RAX: ffffffffffffffda RBX: 00007ffcdd91af50 RCX: 00007f47bc38e6ec
RDX: 0000000000000000 RSI: 00007ffcdd91af50 RDI: 0000000000000023
RBP: 00007ffcdd91b190 R08: 00007ffcdd91ae50 R09: 00007ffcdd91ae60
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffcdd91b1f0
R13: 0000000000000000 R14: 00007ffcdd91b3a0 R15: 00007ffcdd91afe0
 </TASK>
----------------
Code disassembly (best guess):
   0:	fb                   	sti
   1:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
   8:	fc ff df
   b:	65 8b 05 a4 2d a5 0d 	mov    %gs:0xda52da4(%rip),%eax        # 0xda52db6
  12:	a9 00 01 ff 00       	test   $0xff0100,%eax
  17:	0f 84 ee 00 00 00    	je     0x10b
  1d:	49 89 dd             	mov    %rbx,%r13
  20:	49 c1 ed 03          	shr    $0x3,%r13
  24:	43 80 7c 25 00 00    	cmpb   $0x0,0x0(%r13,%r12,1)
* 2a:	74 08                	je     0x34 <-- trapping instruction
  2c:	48 89 df             	mov    %rbx,%rdi
  2f:	e8 12 11 2a fd       	call   0xfd2a1146
  34:	48 83 3b 00          	cmpq   $0x0,(%rbx)
  38:	0f 84 18 01 00 00    	je     0x156
  3e:	4c                   	rex.WR
  3f:	8d                   	.byte 0x8d