syzbot
BUG: unable to handle kernel NULL pointer dereference in bond_xdp_xmit (2)
Status:
auto-obsoleted due to no activity on 2025/11/16 18:17
Reported-by: syzbot+de2d44312a2707cc57e7@syzkaller.appspotmail.com
First crash: 506d, last: 357d
Sample crash report:
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 5e193067 P4D 5e193067 PUD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4861 Comm: syz.3.123 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90002fcf618 EFLAGS: 00010246
RAX: 1ffffffff161b527 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffffc90002fcf6c0 RSI: 0000000000000001 RDI: ffff8880769c0000
RBP: ffffc90002fcf730 R08: dffffc0000000000 R09: ffffed100ed38008
R10: ffffed100ed38008 R11: 1ffff1100ed38007 R12: ffffffff8b0da938
R13: dffffc0000000000 R14: ffff8880769c0000 R15: ffffe8ffffd437c8
FS: 00007fd153d5b6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000061c46000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
bond_xdp_xmit+0x282/0x420 drivers/net/bonding/bond_main.c:5228
bq_xmit_all+0xbb1/0xf60 kernel/bpf/devmap.c:391
__dev_flush+0xbf/0x1b0 kernel/bpf/devmap.c:421
xdp_do_flush+0xa/0x20 net/core/filter.c:3986
tun_build_skb drivers/net/tun.c:1703 [inline]
tun_get_user+0x297c/0x38d0 drivers/net/tun.c:1797
tun_chr_write_iter+0x112/0x1e0 drivers/net/tun.c:2019
call_write_iter include/linux/fs.h:2172 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x712/0xd00 fs/read_write.c:594
ksys_write+0x14d/0x250 fs/read_write.c:647
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd155af269f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fd153d5b000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd155d1afa0 RCX: 00007fd155af269f
RDX: 0000000000000015 RSI: 0000200000000300 RDI: 00000000000000c8
RBP: 00007fd155b76e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000015 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fd155d1b038 R14: 00007fd155d1afa0 R15: 00007ffedcc06af8
</TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 56fae479a22f1665 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc90002fcf618 EFLAGS: 00010246
RAX: 1ffffffff161b527 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffffc90002fcf6c0 RSI: 0000000000000001 RDI: ffff8880769c0000
RBP: ffffc90002fcf730 R08: dffffc0000000000 R09: ffffed100ed38008
R10: ffffed100ed38008 R11: 1ffff1100ed38007 R12: ffffffff8b0da938
R13: dffffc0000000000 R14: ffff8880769c0000 R15: ffffe8ffffd437c8
FS: 00007fd153d5b6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000061c46000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Struck through repros no longer work on HEAD.