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Message-ID: <67a9b8e9.050a0220.3d72c.004c.GAE@google.com>
Date: Mon, 10 Feb 2025 00:29:29 -0800
From: syzbot <syzbot+94c6d316eec8a68cc993@...kaller.appspotmail.com>
To: brauner@...nel.org, davem@...emloft.net, dsahern@...nel.org,
edumazet@...gle.com, horms@...nel.org, jack@...e.cz,
kent.overstreet@...ux.dev, kuba@...nel.org, linux-bcachefs@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com,
viro@...iv.linux.org.uk
Subject: [syzbot] [net?] [bcachefs?] general protection fault in ipv6_get_saddr_eval
Hello,
syzbot found the following issue on:
HEAD commit: 69b8923f5003 Merge tag 'for-linus-6.14-ofs4' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15912eb0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=57ab43c279fa614d
dashboard link: https://syzkaller.appspot.com/bug?extid=94c6d316eec8a68cc993
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169983df980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ea84ac864e92/disk-69b8923f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6a465997b4e0/vmlinux-69b8923f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d72b67b2bd15/bzImage-69b8923f.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/0073f7fa8a9c/mount_0.gz
The issue was bisected to:
commit 14152654805256d760315ec24e414363bfa19a06
Author: Kent Overstreet <kent.overstreet@...ux.dev>
Date: Mon Nov 25 05:21:27 2024 +0000
bcachefs: Bad btree roots are now autofix
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13505df8580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=10d05df8580000
console output: https://syzkaller.appspot.com/x/log.txt?x=17505df8580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+94c6d316eec8a68cc993@...kaller.appspotmail.com
Fixes: 141526548052 ("bcachefs: Bad btree roots are now autofix")
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.13.0-syzkaller-09793-g69b8923f5003 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:ipv6_get_saddr_eval+0x511/0xf50 net/ipv6/addrconf.c:1666
Code: e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 98 a9 97 f7 48 89 6c 24 08 4d 8b 2e 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 71 a9 97 f7 41 be e0 00 00 00 4d 03
RSP: 0018:ffffc900001168b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888024f99e40 RCX: dffffc0000000000
RDX: ffff88805fc0dc00 RSI: ffffffff8fdb28c0 RDI: ffffc900001169e8
RBP: 0000000000000006 R08: 0000000000000005 R09: ffffffff8a8bbc59
R10: 000000000000000b R11: ffff88801c285a00 R12: ffffc90000116a40
R13: 0000000000000000 R14: ffff88805fc0dd38 R15: 0000000000000006
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa3ddba7bac CR3: 0000000024428000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__ipv6_dev_get_saddr+0x1d3/0x4b0 net/ipv6/addrconf.c:1753
ipv6_dev_get_saddr+0x555/0xc10 net/ipv6/addrconf.c:1889
ip6_route_get_saddr include/net/ip6_route.h:147 [inline]
ip6_dst_lookup_tail+0xf18/0x14f0 net/ipv6/ip6_output.c:1133
ip6_dst_lookup_flow+0xb9/0x180 net/ipv6/ip6_output.c:1259
udp_tunnel6_dst_lookup+0x2be/0x520 net/ipv6/ip6_udp_tunnel.c:165
geneve6_xmit_skb drivers/net/geneve.c:950 [inline]
geneve_xmit+0xcf2/0x2cf0 drivers/net/geneve.c:1036
__netdev_start_xmit include/linux/netdevice.h:5144 [inline]
netdev_start_xmit include/linux/netdevice.h:5153 [inline]
xmit_one net/core/dev.c:3735 [inline]
dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3751
__dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4584
dev_queue_xmit include/linux/netdevice.h:3305 [inline]
neigh_hh_output include/net/neighbour.h:523 [inline]
neigh_output include/net/neighbour.h:537 [inline]
ip6_finish_output2+0x1263/0x1780 net/ipv6/ip6_output.c:141
ip6_finish_output+0x41e/0x840 net/ipv6/ip6_output.c:226
NF_HOOK+0x9e/0x430 include/linux/netfilter.h:314
mld_sendpack+0x843/0xdb0 net/ipv6/mcast.c:1862
ipv6_mc_dad_complete+0x88/0x490 net/ipv6/mcast.c:2288
addrconf_dad_completed+0x712/0xcd0 net/ipv6/addrconf.c:4336
addrconf_dad_work+0xdbc/0x16a0
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
worker_thread+0x870/0xd30 kernel/workqueue.c:3398
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ipv6_get_saddr_eval+0x511/0xf50 net/ipv6/addrconf.c:1666
Code: e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 98 a9 97 f7 48 89 6c 24 08 4d 8b 2e 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 71 a9 97 f7 41 be e0 00 00 00 4d 03
RSP: 0018:ffffc900001168b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888024f99e40 RCX: dffffc0000000000
RDX: ffff88805fc0dc00 RSI: ffffffff8fdb28c0 RDI: ffffc900001169e8
RBP: 0000000000000006 R08: 0000000000000005 R09: ffffffff8a8bbc59
R10: 000000000000000b R11: ffff88801c285a00 R12: ffffc90000116a40
R13: 0000000000000000 R14: ffff88805fc0dd38 R15: 0000000000000006
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa3ddba7bac CR3: 0000000024428000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 03 42 80 3c call 0x3c804208
5: 28 00 sub %al,(%rax)
7: 74 08 je 0x11
9: 4c 89 f7 mov %r14,%rdi
c: e8 98 a9 97 f7 call 0xf797a9a9
11: 48 89 6c 24 08 mov %rbp,0x8(%rsp)
16: 4d 8b 2e mov (%r14),%r13
19: 4c 89 e8 mov %r13,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
27: fc ff df
* 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 4c 89 ef mov %r13,%rdi
33: e8 71 a9 97 f7 call 0xf797a9a9
38: 41 be e0 00 00 00 mov $0xe0,%r14d
3e: 4d rex.WRB
3f: 03 .byte 0x3
---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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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