syzbot


BUG: unable to handle kernel paging request in find_match

Status: upstream: reported on 2025/05/28 21:21
Reported-by: syzbot+123b13f747b4d5abf71f@syzkaller.appspotmail.com
First crash: 16d, last: 3d06h
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 BUG: unable to handle kernel paging request in find_match 5 22d 77d 0/3 upstream: reported on 2025/03/28 21:20
upstream general protection fault in find_match (3) net 2 977d 1019d 0/28 auto-obsoleted due to no activity on 2023/01/16 14:40
android-6-1 general protection fault in find_match 2 8d11h 32d 0/2 premoderation: reported on 2025/05/12 10:56
upstream general protection fault in find_match (4) net 1 661d 657d 0/28 auto-obsoleted due to no activity on 2023/11/20 22:29
upstream general protection fault in find_match (2) net 4 1569d 1634d 0/28 auto-closed as invalid on 2021/06/26 04:02
android-5-15 general protection fault in find_match 3 43d 66d 0/2 premoderation: reported on 2025/04/08 10:01
upstream general protection fault in find_match (5) net 2 368d 369d 26/28 fixed on 2024/07/10 10:07
android-5-10 general protection fault in find_match 40 7d23h 70d 0/2 premoderation: reported on 2025/04/04 19:16

Sample crash report:
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: 10919 Comm: syz.5.1538 Not tainted 6.1.141-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 : ffff800022676f40
x29: ffff800022676f60 x28: 1fffe00018734304 x27: dfff800000000000
x26: 0000000000000340 x25: ffff0000c39a1837 x24: 0000000000000201
x23: 0000000000000003 x22: ffff0000c39a1820 x21: 0000000000000009
x20: 1fffe00018734306 x19: 0000000000000000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082d0750 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff0080001077fb04 x10: 0000000000000002 x9 : ffff0000e6e1b780
x8 : 0000000000000068 x7 : ffff8000226772f0 x6 : 0000000000000003
x5 : ffff8000226772f0 x4 : ffff8000226772e0 x3 : 0000000000000003
x2 : 0000000000000009 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]
 ip6_dst_lookup_tail+0x168/0x12c0 net/ipv6/ip6_output.c:1124
 ip6_dst_lookup_flow+0x54/0xe0 net/ipv6/ip6_output.c:1255
 ip6_datagram_dst_update+0x5a8/0xa88 net/ipv6/datagram.c:94
 __ip6_datagram_connect+0x814/0xce4 net/ipv6/datagram.c:253
 ip6_datagram_connect net/ipv6/datagram.c:277 [inline]
 ip6_datagram_connect_v6_only+0x70/0xbc net/ipv6/datagram.c:289
 inet_dgram_connect+0x17c/0x35c net/ipv4/af_inet.c:583
 __sys_connect_file net/socket.c:2011 [inline]
 __sys_connect+0x264/0x28c net/socket.c:2028
 __do_sys_connect net/socket.c:2038 [inline]
 __se_sys_connect net/socket.c:2035 [inline]
 __arm64_sys_connect+0x7c/0x94 net/socket.c:2035
 __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: 96055809 f94002c8 910d011a d343ff48 (387b6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	96055809 	bl	0xfffffffff8156024
   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

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/10 22:57 linux-6.1.y 58485ff1a74f 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/07 07:19 linux-6.1.y 58485ff1a74f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/07 07:19 linux-6.1.y 58485ff1a74f 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/06 14:45 linux-6.1.y 58485ff1a74f 9fa58bba .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/05 04:11 linux-6.1.y 58485ff1a74f 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in find_match
2025/06/05 04:09 linux-6.1.y 58485ff1a74f 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in find_match
2025/05/28 21:21 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in find_match
* Struck through repros no longer work on HEAD.