syzbot

Unable to handle kernel paging request at virtual address dfff800000000068
KASAN: null-ptr-deref in range [0x0000000000000340-0x0000000000000347]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000068] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 11165 Comm: syz.4.1923 Not tainted 6.1.143-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __in6_dev_get include/net/addrconf.h:323 [inline]
pc : ip6_ignore_linkdown include/net/addrconf.h:414 [inline]
pc : find_match+0xa0/0xb0c net/ipv6/route.c:784
lr : find_match+0x74/0xb0c net/ipv6/route.c:781
sp : ffff8000219d6380
x29: ffff8000219d63a0 x28: 1fffe0001b84ee44 x27: dfff800000000000
x26: 0000000000000340 x25: ffff0000dc277237 x24: 0000000000000201
x23: 0000000000000002 x22: ffff0000dc277220 x21: 0000000000000000
x20: 1fffe0001b84ee46 x19: 0000000000000000 x18: 0000000000000000
x17: ffff8000181e6000 x16: ffff8000082d0f50 x15: 0000000000000002
x14: 00000000000000e0 x13: 1ffff00002a160b1 x12: 0000000000ff0100
x11: ff008000107a5eb8 x10: 0000000000000002 x9 : ffff0000db780000
x8 : 0000000000000068 x7 : ffff8000219d6730 x6 : 0000000000000002
x5 : ffff8000219d6730 x4 : ffff8000219d6720 x3 : 0000000000000002
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 __in6_dev_get include/net/addrconf.h:323 [inline]
 ip6_ignore_linkdown include/net/addrconf.h:414 [inline]
 find_match+0xa0/0xb0c net/ipv6/route.c:784
 rt6_nh_find_match+0xcc/0x138 net/ipv6/route.c:824
 nexthop_for_each_fib6_nh+0x1a8/0x3d0 net/ipv4/nexthop.c:1243
 __find_rr_leaf+0x3b8/0x5c8 net/ipv6/route.c:865
 find_rr_leaf net/ipv6/route.c:893 [inline]
 rt6_select net/ipv6/route.c:937 [inline]
 fib6_table_lookup+0x308/0x8b8 net/ipv6/route.c:2223
 ip6_pol_route+0x1f4/0x1024 net/ipv6/route.c:2259
 ip6_pol_route_output+0x60/0x94 net/ipv6/route.c:2634
 pol_lookup_func include/net/ip6_fib.h:579 [inline]
 fib6_rule_lookup+0x258/0x4a8 net/ipv6/fib6_rules.c:121
 ip6_route_output_flags_noref+0x250/0x314 net/ipv6/route.c:2666
 ip6_route_output_flags+0xe4/0x368 net/ipv6/route.c:2679
 ip6_route_output include/net/ip6_route.h:98 [inline]
 icmpv6_rt_has_prefsrc+0x5c/0x3b8 net/ipv6/icmp.c:246
 icmp6_send+0x930/0x13e4 net/ipv6/icmp.c:564
 __icmpv6_send include/linux/icmpv6.h:28 [inline]
 icmpv6_ndo_send+0x134/0x410 net/ipv6/ip6_icmp.c:62
 tnl_update_pmtu+0xaa4/0xe3c net/ipv4/ip_tunnel.c:562
 ip_tunnel_xmit+0xae0/0x2044 net/ipv4/ip_tunnel.c:818
 __gre_xmit net/ipv4/ip_gre.c:474 [inline]
 ipgre_xmit+0x694/0xa14 net/ipv4/ip_gre.c:669
 __netdev_start_xmit include/linux/netdevice.h:4896 [inline]
 netdev_start_xmit include/linux/netdevice.h:4910 [inline]
 xmit_one net/core/dev.c:3658 [inline]
 dev_hard_start_xmit+0x244/0x8e0 net/core/dev.c:3674
 __dev_queue_xmit+0x155c/0x309c net/core/dev.c:4334
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 __bpf_tx_skb+0x160/0x258 net/core/filter.c:2134
 __bpf_redirect+0x58c/0xc58 net/core/filter.c:-1
 ____bpf_clone_redirect net/core/filter.c:2464 [inline]
 bpf_clone_redirect+0x1f0/0x314 net/core/filter.c:2434
 bpf_prog_da1e0ee5f8d5c8f5+0x90/0xc8
 bpf_dispatcher_nop_func include/linux/bpf.h:1001 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 bpf_test_run+0x284/0x828 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0x7e8/0xee0 net/bpf/test_run.c:1183
 bpf_prog_test_run+0x2dc/0x364 kernel/bpf/syscall.c:3685
 __sys_bpf+0x4ec/0x634 kernel/bpf/syscall.c:5038
 __do_sys_bpf kernel/bpf/syscall.c:5124 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5122 [inline]
 __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5122
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 9604c1a1 f94002c8 910d011a d343ff48 (387b6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9604c1a1 	bl	0xfffffffff8130684
   4:	f94002c8 	ldr	x8, [x22]
   8:	910d011a 	add	x26, x8, #0x340
   c:	d343ff48 	lsr	x8, x26, #3
* 10:	387b6908 	ldrb	w8, [x8, x27] <-- trapping instruction