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Message-ID: <681798b9.050a0220.11da1b.0033.GAE@google.com> Date: Sun, 04 May 2025 09:41:29 -0700 From: syzbot <syzbot+c98f63d3185beafbc080@...kaller.appspotmail.com> To: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] general protection fault in rt6_find_cached_rt Hello, syzbot found the following issue on: HEAD commit: 2bfcee565c3a Merge tag 'bcachefs-2025-05-01' of git://evil.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14ecf774580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a9a25b7a36123454 dashboard link: https://syzkaller.appspot.com/bug?extid=c98f63d3185beafbc080 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/75f61dd1e26c/disk-2bfcee56.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b0255b732c7e/vmlinux-2bfcee56.xz kernel image: https://storage.googleapis.com/syzbot-assets/bff4e7ba94d0/bzImage-2bfcee56.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c98f63d3185beafbc080@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] CPU: 1 UID: 0 PID: 5881 Comm: kworker/1:4 Not tainted 6.15.0-rc4-syzkaller-00189-g2bfcee565c3a #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Workqueue: mld mld_ifc_work RIP: 0010:fib6_nh_get_excptn_bucket net/ipv6/route.c:1662 [inline] RIP: 0010:rt6_find_cached_rt+0xb9/0x270 net/ipv6/route.c:1858 Code: 48 c1 e8 03 48 89 44 24 08 48 8b 44 24 08 80 3c 18 00 74 08 4c 89 f7 e8 65 8c 14 f8 49 8b 2e 48 83 c5 60 48 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 48 89 ef e8 49 8c 14 f8 4c 8b 6d 00 e8 70 c5 48 RSP: 0018:ffffc90000a084e0 EFLAGS: 00010206 RAX: 000000000000000c RBX: dffffc0000000000 RCX: 0000000000000100 RDX: ffff88807f319e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000060 R08: ffff88807ef99633 R09: 1ffff1100fdf32c6 R10: dffffc0000000000 R11: ffffed100fdf32c7 R12: ffffc90000a085b8 R13: 0000000000000000 R14: ffffc90000a085b0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb92ae56c0 CR3: 000000006a5c2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000005325 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> ip6_pol_route+0x28d/0x1180 net/ipv6/route.c:2273 pol_lookup_func include/net/ip6_fib.h:616 [inline] fib6_rule_lookup+0x55e/0x6f0 net/ipv6/fib6_rules.c:125 ip6_route_input_lookup net/ipv6/route.c:2335 [inline] ip6_route_input+0x6ce/0xa50 net/ipv6/route.c:2631 ip6_rcv_finish+0x141/0x2d0 net/ipv6/ip6_input.c:77 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:314 __netif_receive_skb_one_core net/core/dev.c:5887 [inline] __netif_receive_skb+0xd3/0x380 net/core/dev.c:6000 process_backlog+0x60e/0x14f0 net/core/dev.c:6352 __napi_poll+0xc4/0x480 net/core/dev.c:7324 napi_poll net/core/dev.c:7388 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510 handle_softirqs+0x283/0x870 kernel/softirq.c:579 do_softirq+0xec/0x180 kernel/softirq.c:480 </IRQ> <TASK> __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline] __dev_queue_xmit+0x1cd7/0x3a70 net/core/dev.c:4656 neigh_output include/net/neighbour.h:539 [inline] ip6_finish_output2+0x11fb/0x16a0 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226 NF_HOOK+0x9e/0x380 include/linux/netfilter.h:314 mld_sendpack+0x800/0xd80 net/ipv6/mcast.c:1868 mld_send_cr net/ipv6/mcast.c:2169 [inline] mld_ifc_work+0x835/0xde0 net/ipv6/mcast.c:2702 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fib6_nh_get_excptn_bucket net/ipv6/route.c:1662 [inline] RIP: 0010:rt6_find_cached_rt+0xb9/0x270 net/ipv6/route.c:1858 Code: 48 c1 e8 03 48 89 44 24 08 48 8b 44 24 08 80 3c 18 00 74 08 4c 89 f7 e8 65 8c 14 f8 49 8b 2e 48 83 c5 60 48 89 e8 48 c1 e8 03 <80> 3c 18 00 74 08 48 89 ef e8 49 8c 14 f8 4c 8b 6d 00 e8 70 c5 48 RSP: 0018:ffffc90000a084e0 EFLAGS: 00010206 RAX: 000000000000000c RBX: dffffc0000000000 RCX: 0000000000000100 RDX: ffff88807f319e00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000060 R08: ffff88807ef99633 R09: 1ffff1100fdf32c6 R10: dffffc0000000000 R11: ffffed100fdf32c7 R12: ffffc90000a085b8 R13: 0000000000000000 R14: ffffc90000a085b0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb92ae56c0 CR3: 000000006a5c2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000005325 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 48 89 44 24 08 mov %rax,0x8(%rsp) 9: 48 8b 44 24 08 mov 0x8(%rsp),%rax e: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 12: 74 08 je 0x1c 14: 4c 89 f7 mov %r14,%rdi 17: e8 65 8c 14 f8 call 0xf8148c81 1c: 49 8b 2e mov (%r14),%rbp 1f: 48 83 c5 60 add $0x60,%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 ef mov %rbp,%rdi 33: e8 49 8c 14 f8 call 0xf8148c81 38: 4c 8b 6d 00 mov 0x0(%rbp),%r13 3c: e8 .byte 0xe8 3d: 70 c5 jo 0x4 3f: 48 rex.W --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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