------------[ cut here ]------------
WARNING: CPU: 0 PID: 21859 at net/ipv4/ipmr.c:2302 ip_mr_output+0xbb1/0xe70 net/ipv4/ipmr.c:2302
Modules linked in:
CPU: 0 UID: 0 PID: 21859 Comm: syz.1.4475 Not tainted 6.16.0-rc2-syzkaller-00622-g091d019adce0 #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: 0018:ffffc90000007900 EFLAGS: 00010246
RAX: ffffffff89fa4640 RBX: ffff888050953640 RCX: ffff88802952da00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007a10 R08: ffff88802952da00 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff89fa3a90 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff8880861de800 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125c4f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ca20220 CR3: 000000007468c000 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:preempt_latency_start kernel/sched/core.c:5854 [inline]
RIP: 0010:preempt_count_add+0xba/0x1a0 kernel/sched/core.c:5877
Code: 00 85 c0 74 09 31 db 31 ff e8 22 ee 0d 00 65 4c 8b 34 25 08 10 9d 92 49 81 c6 e0 14 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 0c 08 93 00 49 89 1e 5b 41 5e 41 5f e9 bf 75 d8
RSP: 0018:ffffc9000c26f728 EFLAGS: 00000246
RAX: 1ffff110052a5ddc RBX: ffffffff817461d1 RCX: ffffffff99a85300
RDX: 0000000000000000 RSI: 0000000000001000 RDI: ffffffff817461d1
RBP: 000000000021a310 R08: 00000000c0a63f06 R09: 00000000b0b71c7b
R10: 000000000000000e R11: ffffffff81acf690 R12: 0000000000001000
R13: dffffc0000000000 R14: ffff88802952eee0 R15: dffffc0000000000
 rcu_read_lock_sched include/linux/rcupdate.h:930 [inline]
 pfn_valid include/linux/mmzone.h:2158 [inline]
 __virt_addr_valid+0x1c1/0x5c0 arch/x86/mm/physaddr.c:65
 kasan_addr_to_slab+0xf/0x90 mm/kasan/common.c:37
 kasan_record_aux_stack+0xf/0xd0 mm/kasan/generic.c:533
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x2f6/0x400 mm/slub.c:4745
 exit_mmap+0x53f/0xb50 mm/mmap.c:1309
 __mmput+0x118/0x420 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x640/0x22e0 kernel/exit.c:943
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
 get_signal+0x1286/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f639118e929
Code: Unable to access opcode bytes at 0x7f639118e8ff.
RSP: 002b:00007f63920030e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f63913b6088 RCX: 00007f639118e929
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f63913b6088
RBP: 00007f63913b6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f63913b608c
R13: 0000000000000000 R14: 00007ffeb46107c0 R15: 00007ffeb46108a8
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	85 c0                	test   %eax,%eax
   2:	74 09                	je     0xd
   4:	31 db                	xor    %ebx,%ebx
   6:	31 ff                	xor    %edi,%edi
   8:	e8 22 ee 0d 00       	call   0xdee2f
   d:	65 4c 8b 34 25 08 10 	mov    %gs:0xffffffff929d1008,%r14
  14:	9d 92
  16:	49 81 c6 e0 14 00 00 	add    $0x14e0,%r14
  1d:	4c 89 f0             	mov    %r14,%rax
  20:	48 c1 e8 03          	shr    $0x3,%rax
  24:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
* 29:	74 08                	je     0x33 <-- trapping instruction
  2b:	4c 89 f7             	mov    %r14,%rdi
  2e:	e8 0c 08 93 00       	call   0x93083f
  33:	49 89 1e             	mov    %rbx,(%r14)
  36:	5b                   	pop    %rbx
  37:	41 5e                	pop    %r14
  39:	41 5f                	pop    %r15
  3b:	e9                   	.byte 0xe9
  3c:	bf                   	.byte 0xbf
  3d:	75 d8                	jne    0x17