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Message-ID: <671acd8e.050a0220.381c35.0004.GAE@google.com>
Date: Thu, 24 Oct 2024 15:43:26 -0700
From: syzbot <syzbot+14c04e62ca58315571d1@...kaller.appspotmail.com>
To: davem@...emloft.net, dhowells@...hat.com, edumazet@...gle.com,
kuba@...nel.org, linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org,
marc.dionne@...istor.com, netdev@...r.kernel.org, pabeni@...hat.com,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [afs?] [net?] KMSAN: uninit-value in rxrpc_lookup_peer_rcu
Hello,
syzbot found the following issue on:
HEAD commit: db87114dcf13 Merge tag 'x86_urgent_for_v6.12_rc4' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12cf2a40580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7a0aee472a2b5f0a
dashboard link: https://syzkaller.appspot.com/bug?extid=14c04e62ca58315571d1
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/140719cfa0c4/disk-db87114d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fb8a264c89a8/vmlinux-db87114d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4de63179d231/bzImage-db87114d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+14c04e62ca58315571d1@...kaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in rxrpc_lookup_peer_rcu+0x2f8/0x300 net/rxrpc/peer_object.c:142
rxrpc_lookup_peer_rcu+0x2f8/0x300 net/rxrpc/peer_object.c:142
rxrpc_lookup_peer_local_rcu net/rxrpc/peer_event.c:97 [inline]
rxrpc_input_error+0x756/0x16e0 net/rxrpc/peer_event.c:148
rxrpc_io_thread+0x13aa/0x5190 net/rxrpc/io_thread.c:498
kthread+0x3e2/0x540 kernel/kthread.c:389
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was stored to memory at:
rxrpc_input_error+0x499/0x16e0 net/rxrpc/peer_event.c:148
rxrpc_io_thread+0x13aa/0x5190 net/rxrpc/io_thread.c:498
kthread+0x3e2/0x540 kernel/kthread.c:389
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4091 [inline]
slab_alloc_node mm/slub.c:4134 [inline]
kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4186
kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
__alloc_skb+0x363/0x7b0 net/core/skbuff.c:678
alloc_skb include/linux/skbuff.h:1322 [inline]
ipv6_local_error+0xd0/0xa10 net/ipv6/datagram.c:354
__ip6_append_data+0x6f3/0x68e0 net/ipv6/ip6_output.c:1491
ip6_make_skb+0x5bd/0xd60 net/ipv6/ip6_output.c:2048
udpv6_sendmsg+0x3b5e/0x40c0 net/ipv6/udp.c:1584
do_udp_sendmsg net/rxrpc/output.c:32 [inline]
rxrpc_send_data_packet net/rxrpc/output.c:488 [inline]
rxrpc_transmit_one+0xf68/0x2f20 net/rxrpc/output.c:713
rxrpc_decant_prepared_tx net/rxrpc/call_event.c:271 [inline]
rxrpc_transmit_some_data net/rxrpc/call_event.c:295 [inline]
rxrpc_input_call_event+0x18ba/0x2c10 net/rxrpc/call_event.c:401
rxrpc_io_thread+0xa5c/0x5190 net/rxrpc/io_thread.c:478
kthread+0x3e2/0x540 kernel/kthread.c:389
ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
CPU: 0 UID: 0 PID: 12896 Comm: krxrpcio/0 Tainted: G W 6.12.0-rc3-syzkaller-00454-gdb87114dcf13 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================
---
This report is generated by a bot. It may contain errors.
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