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Message-ID: <67aa4147.050a0220.3d72c.0055.GAE@google.com> Date: Mon, 10 Feb 2025 10:11:19 -0800 From: syzbot <syzbot+3b1dd14b3a62374e75c7@...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 arp_create (3) Hello, syzbot found the following issue on: HEAD commit: 7ee983c850b4 Merge tag 'drm-fixes-2025-02-08' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=127b61b0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=147b7d49d83b8036 dashboard link: https://syzkaller.appspot.com/bug?extid=3b1dd14b3a62374e75c7 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/54ead761f64f/disk-7ee983c8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/95e57de2a045/vmlinux-7ee983c8.xz kernel image: https://storage.googleapis.com/syzbot-assets/d24a612a8ac7/bzImage-7ee983c8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3b1dd14b3a62374e75c7@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000016: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000b0-0x00000000000000b7] CPU: 1 UID: 0 PID: 3448 Comm: kworker/u8:9 Not tainted 6.14.0-rc1-syzkaller-00181-g7ee983c850b4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: bat_events batadv_bla_periodic_work RIP: 0010:arp_create+0x46/0x910 net/ipv4/arp.c:554 Code: 49 89 ce 89 54 24 3c 89 74 24 30 89 fb 49 bd 00 00 00 00 00 fc ff df e8 18 e6 62 f7 49 8d be b4 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 db 05 00 00 45 0f b7 a6 b4 00 00 00 49 RSP: 0018:ffffc9000c3a7870 EFLAGS: 00010203 RAX: 0000000000000016 RBX: 0000000000000002 RCX: ffff888031bcbc00 RDX: 0000000000000000 RSI: 0000000000000806 RDI: 00000000000000b4 RBP: ffffc9000c3a79f0 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52001874f30 R12: ffffc9000c3a7aa0 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4b41e61fa8 CR3: 000000007e55a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> batadv_bla_send_claim+0x16f/0xea0 net/batman-adv/bridge_loop_avoidance.c:361 batadv_bla_send_announce net/batman-adv/bridge_loop_avoidance.c:675 [inline] batadv_bla_periodic_work+0x5dc/0xaf0 net/batman-adv/bridge_loop_avoidance.c:1481 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:arp_create+0x46/0x910 net/ipv4/arp.c:554 Code: 49 89 ce 89 54 24 3c 89 74 24 30 89 fb 49 bd 00 00 00 00 00 fc ff df e8 18 e6 62 f7 49 8d be b4 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 db 05 00 00 45 0f b7 a6 b4 00 00 00 49 RSP: 0018:ffffc9000c3a7870 EFLAGS: 00010203 RAX: 0000000000000016 RBX: 0000000000000002 RCX: ffff888031bcbc00 RDX: 0000000000000000 RSI: 0000000000000806 RDI: 00000000000000b4 RBP: ffffc9000c3a79f0 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52001874f30 R12: ffffc9000c3a7aa0 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4b41e61fa8 CR3: 00000000348fa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 49 89 ce mov %rcx,%r14 3: 89 54 24 3c mov %edx,0x3c(%rsp) 7: 89 74 24 30 mov %esi,0x30(%rsp) b: 89 fb mov %edi,%ebx d: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 14: fc ff df 17: e8 18 e6 62 f7 call 0xf762e634 1c: 49 8d be b4 00 00 00 lea 0xb4(%r14),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 db 05 00 00 jne 0x612 37: 45 0f b7 a6 b4 00 00 movzwl 0xb4(%r14),%r12d 3e: 00 3f: 49 rex.WB --- 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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