==================================================================
BUG: KASAN: stack-out-of-bounds in jhash2 include/linux/jhash.h:138 [inline]
BUG: KASAN: stack-out-of-bounds in __xfrm6_addr_hash net/xfrm/xfrm_hash.h:16 [inline]
BUG: KASAN: stack-out-of-bounds in __xfrm6_daddr_saddr_hash net/xfrm/xfrm_hash.h:29 [inline]
BUG: KASAN: stack-out-of-bounds in __xfrm_dst_hash+0x399/0x480 net/xfrm/xfrm_hash.h:95
Read of size 4 at addr ffffc900001d0ad8 by task syz-executor.0/607

CPU: 1 PID: 607 Comm: syz-executor.0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 jhash2 include/linux/jhash.h:138 [inline]
 __xfrm6_addr_hash net/xfrm/xfrm_hash.h:16 [inline]
 __xfrm6_daddr_saddr_hash net/xfrm/xfrm_hash.h:29 [inline]
 __xfrm_dst_hash+0x399/0x480 net/xfrm/xfrm_hash.h:95
 xfrm_dst_hash net/xfrm/xfrm_state.c:63 [inline]
 xfrm_state_find+0x28a/0x2a10 net/xfrm/xfrm_state.c:1092
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2396 [inline]
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2441 [inline]
 xfrm_resolve_and_create_bundle+0x697/0x29f0 net/xfrm/xfrm_policy.c:2734
 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2969 [inline]
 xfrm_lookup_with_ifid+0x4e9/0x2080 net/xfrm/xfrm_policy.c:3100
 xfrm_lookup net/xfrm/xfrm_policy.c:3197 [inline]
 xfrm_lookup_route+0x3c/0x170 net/xfrm/xfrm_policy.c:3208
 ip_route_output_flow+0x1f8/0x2f0 net/ipv4/route.c:2905
 ip_route_output_ports include/net/route.h:169 [inline]
 igmpv3_newpack+0x280/0xcd0 net/ipv4/igmp.c:372
 add_grhead+0x75/0x2e0 net/ipv4/igmp.c:443
 add_grec+0x116c/0x1410 net/ipv4/igmp.c:577
 igmpv3_send_cr net/ipv4/igmp.c:714 [inline]
 igmp_ifc_timer_expire+0x89e/0xf80 net/ipv4/igmp.c:813
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1459
 expire_timers kernel/time/timer.c:1504 [inline]
 __run_timers+0x650/0x9e0 kernel/time/timer.c:1775
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1788
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unlink_anon_vmas+0x8e/0x590 mm/rmap.c:-1
Code: 45 a0 4c 89 75 c0 4d 89 e7 49 c1 ef 03 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 4c 89 e7 e8 56 21 07 00 49 8b 04 24 <48> 89 45 c8 49 8d 5c 24 f8 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00
RSP: 0018:ffffc90000df7770 EFLAGS: 00000246
RAX: ffff888113803e50 RBX: ffff88810de470b8 RCX: ffff8881164993c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000df77d0 R08: ffff88810de470cf R09: 1ffff11021bc8e19
R10: dffffc0000000000 R11: ffffed1021bc8e1a R12: ffff8881138031f0
R13: ffff88810de470b8 R14: ffff888113868818 R15: 1ffff1102270063e
 free_pgtables+0x131/0x280 mm/memory.c:489
 exit_mmap+0x433/0x8b0 mm/mmap.c:3247
 __mmput+0x93/0x320 kernel/fork.c:1180
 mmput+0x50/0x150 kernel/fork.c:1203
 exit_mm kernel/exit.c:554 [inline]
 do_exit+0x9f2/0x27e0 kernel/exit.c:876
 do_group_exit+0x141/0x310 kernel/exit.c:1003
 get_signal+0x66a/0x1480 kernel/signal.c:2907
 arch_do_signal_or_restart+0xdf/0x11c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2a13cbaeb9
Code: Unable to access opcode bytes at RIP 0x7f2a13cbae8f.
RSP: 002b:00007f2a1384d178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f2a13df9f88 RCX: 00007f2a13cbaeb9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f2a13df9f8c
RBP: 00007f2a13df9f80 R08: 001bbf34851c7942 R09: 00007f2a1384dcdc
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f2a13df9f8c
R13: 000000000000000b R14: 00007ffeff13de20 R15: 00007ffeff13df08
 </TASK>


Memory state around the buggy address:
 ffffc900001d0980: f8 f8 f3 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
 ffffc900001d0a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900001d0a80: f1 f1 f1 f1 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
                                                    ^
 ffffc900001d0b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc900001d0b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
   0:	45 a0 4c 89 75 c0 4d 	rex.RB movabs 0x49e7894dc075894c,%al
   7:	89 e7 49
   a:	c1 ef 03             	shr    $0x3,%edi
   d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  14:	fc ff df
  17:	41 80 3c 07 00       	cmpb   $0x0,(%r15,%rax,1)
  1c:	74 08                	je     0x26
  1e:	4c 89 e7             	mov    %r12,%rdi
  21:	e8 56 21 07 00       	call   0x7217c
  26:	49 8b 04 24          	mov    (%r12),%rax
* 2a:	48 89 45 c8          	mov    %rax,-0x38(%rbp) <-- trapping instruction
  2e:	49 8d 5c 24 f8       	lea    -0x8(%r12),%rbx
  33:	48 89 d8             	mov    %rbx,%rax
  36:	48 c1 e8 03          	shr    $0x3,%rax
  3a:	48                   	rex.W
  3b:	b9 00 00 00 00       	mov    $0x0,%ecx