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In-Reply-To: <69b46af7.050a0220.36eb34.000e.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b4ed94.050a0220.36eb34.0014.GAE@google.com> Subject: Forwarded: Re: [syzbot] [net?] general protection fault in bond_header_create From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [net?] general protection fault in bond_header_create Author: jiayuan.chen@linux.dev On Fri, Mar 13, 2026 at 12:52:23PM +0800, syzbot wrote: > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: 8004279c41ad Merge tag 'nfs-for-7.0-2' of git://git.linux= -.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1593c416580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3Dccef46afa67b2= b19 > dashboard link: https://syzkaller.appspot.com/bug?extid=3D3d8bc31c45e1145= 0f24c > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25= a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D172d1416580= 000 >=20 > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d= 900f083ada3/non_bootable_disk-8004279c.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/f56a78af5be3/vmlinu= x-8004279c.xz > kernel image: https://storage.googleapis.com/syzbot-assets/89a6ba48229d/b= zImage-8004279c.xz >=20 > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+3d8bc31c45e11450f24c@syzkaller.appspotmail.com >=20 > Oops: general protection fault, probably for non-canonical address 0xe000= 080fee63d21a: 0000 [#1] SMP KASAN NOPTI > KASAN: probably user-memory-access in range [0x0000607f731e90d0-0x0000607= f731e90d7] > CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(= full)=20 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.= 16.3-2 04/01/2014 > Workqueue: mld mld_ifc_work > RIP: 0010:bond_header_create+0x150/0x300 drivers/net/bonding/bond_main.c:= 1524 > Code: e8 25 bd 59 fb 45 85 f6 0f 84 a5 00 00 00 e8 d7 b8 59 fb eb 05 e8 d= 0 b8 59 fb 48 85 ed 0f 84 89 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 38 00= 74 08 48 89 ef e8 71 81 c5 fb 48 8b 6d 00 4c 8d 75 > RSP: 0018:ffffc90000b0f600 EFLAGS: 00010202 > RAX: 00000c0fee63d21a RBX: ffffffff866bf37b RCX: ffff888000c524c0 > RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 > RBP: 0000607f731e90d0 R08: ffffffff866bf37b R09: ffffffff8e75e420 > R10: dffffc0000000000 R11: ffffffff866bf340 R12: 00000000000086dd > R13: ffff8880127763c0 R14: 0000000000000001 R15: dffffc0000000000 > FS: 0000000000000000(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f2fbfe3ff8c CR3: 0000000012645000 CR4: 0000000000352ef0 > Call Trace: > > dev_hard_header include/linux/netdevice.h:3439 [inline] > neigh_connected_output+0x286/0x460 net/core/neighbour.c:1644 > __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] > ip6_finish_output+0x2e5/0x740 net/ipv6/ip6_output.c:219 > NF_HOOK_COND include/linux/netfilter.h:307 [inline] > ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 > dst_output include/net/dst.h:470 [inline] > NF_HOOK+0x177/0x4f0 include/linux/netfilter.h:318 > mld_sendpack+0x8b4/0xe40 net/ipv6/mcast.c:1855 > mld_send_cr net/ipv6/mcast.c:2154 [inline] > mld_ifc_work+0x835/0xe70 net/ipv6/mcast.c:2693 > process_one_work kernel/workqueue.c:3275 [inline] > process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 > worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 > kthread+0x388/0x470 kernel/kthread.c:436 > ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:bond_header_create+0x150/0x300 drivers/net/bonding/bond_main.c:= 1524 > Code: e8 25 bd 59 fb 45 85 f6 0f 84 a5 00 00 00 e8 d7 b8 59 fb eb 05 e8 d= 0 b8 59 fb 48 85 ed 0f 84 89 00 00 00 48 89 e8 48 c1 e8 03 <42> 80 3c 38 00= 74 08 48 89 ef e8 71 81 c5 fb 48 8b 6d 00 4c 8d 75 > RSP: 0018:ffffc90000b0f600 EFLAGS: 00010202 > RAX: 00000c0fee63d21a RBX: ffffffff866bf37b RCX: ffff888000c524c0 > RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 > RBP: 0000607f731e90d0 R08: ffffffff866bf37b R09: ffffffff8e75e420 > R10: dffffc0000000000 R11: ffffffff866bf340 R12: 00000000000086dd > R13: ffff8880127763c0 R14: 0000000000000001 R15: dffffc0000000000 > FS: 0000000000000000(0000) GS:ffff88808ca55000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055e232d92000 CR3: 000000000e54c000 CR4: 0000000000352ef0 > ---------------- > Code disassembly (best guess): > 0: e8 25 bd 59 fb call 0xfb59bd2a > 5: 45 85 f6 test %r14d,%r14d > 8: 0f 84 a5 00 00 00 je 0xb3 > e: e8 d7 b8 59 fb call 0xfb59b8ea > 13: eb 05 jmp 0x1a > 15: e8 d0 b8 59 fb call 0xfb59b8ea > 1a: 48 85 ed test %rbp,%rbp > 1d: 0f 84 89 00 00 00 je 0xac > 23: 48 89 e8 mov %rbp,%rax > 26: 48 c1 e8 03 shr $0x3,%rax > * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instru= ction > 2f: 74 08 je 0x39 > 31: 48 89 ef mov %rbp,%rdi > 34: e8 71 81 c5 fb call 0xfbc581aa > 39: 48 8b 6d 00 mov 0x0(%rbp),%rbp > 3d: 4c rex.WR > 3e: 8d .byte 0x8d > 3f: 75 .byte 0x75 >=20 >=20 > --- > 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@googlegroups.com. >=20 > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >=20 > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title >=20 > 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. >=20 > 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) >=20 > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report >=20 > If you want to undo deduplication, reply with: > #syz undup #syz test diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_mai= n.c index 707419270ebf..47a16117190d 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1518,6 +1518,9 @@ static int bond_header_create(struct sk_buff *skb, st= ruct net_device *bond_dev, struct slave *slave; int ret =3D 0; + /* debug: team ? */ + pr_err("bond_header_create: dev=3D%s\n", bond_dev->name); + rcu_read_lock(); slave =3D rcu_dereference(bond->curr_active_slave); if (slave) {