Hello, syzbot found the following issue on: HEAD commit: 300fbb247eb3 Merge tag 'wireless-2023-11-29' of git://git... git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=115f1a54e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ae1a4ee971a7305 dashboard link: https://syzkaller.appspot.com/bug?extid=e8030702aefd3444fb9e compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16929b52e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=108a528ce80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/882903ce12c3/disk-300fbb24.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bd633c35425c/vmlinux-300fbb24.xz kernel image: https://storage.googleapis.com/syzbot-assets/e400d04e154e/bzImage-300fbb24.xz The issue was bisected to: commit 8866730aed5100f06d3d965c22f1c61f74942541 Author: John Fastabend <john.fastabend@xxxxxxxxx> Date: Wed Nov 29 01:25:56 2023 +0000 bpf, sockmap: af_unix stream sockets need to hold ref for pair sock bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1635a52ce80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1535a52ce80000 console output: https://syzkaller.appspot.com/x/log.txt?x=1135a52ce80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e8030702aefd3444fb9e@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 8866730aed51 ("bpf, sockmap: af_unix stream sockets need to hold ref for pair sock") ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: null-ptr-deref in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: null-ptr-deref in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: null-ptr-deref in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: null-ptr-deref in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: null-ptr-deref in sock_hold include/net/sock.h:777 [inline] BUG: KASAN: null-ptr-deref in unix_stream_bpf_update_proto+0x72/0x430 net/unix/unix_bpf.c:171 Write of size 4 at addr 0000000000000080 by task syz-executor360/5073 CPU: 1 PID: 5073 Comm: syz-executor360 Not tainted 6.7.0-rc2-syzkaller-00143-g300fbb247eb3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:187 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:777 [inline] unix_stream_bpf_update_proto+0x72/0x430 net/unix/unix_bpf.c:171 sock_map_init_proto net/core/sock_map.c:190 [inline] sock_map_link+0xb87/0x1100 net/core/sock_map.c:294 sock_map_update_common+0xf6/0x870 net/core/sock_map.c:483 sock_map_update_elem_sys+0x5b6/0x640 net/core/sock_map.c:577 bpf_map_update_value+0x3af/0x820 kernel/bpf/syscall.c:167 map_update_elem+0x622/0x890 kernel/bpf/syscall.c:1526 __sys_bpf+0x1bfb/0x4920 kernel/bpf/syscall.c:5371 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline] __se_sys_bpf kernel/bpf/syscall.c:5485 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5485 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f1c8f3fe369 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd877e4a58 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ffd877e4c28 RCX: 00007f1c8f3fe369 RDX: 0000000000000020 RSI: 0000000020000140 RDI: 0000000000000002 RBP: 00007f1c8f471610 R08: 00007ffd877e4c28 R09: 00007ffd877e4c28 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd877e4c18 R14: 0000000000000001 R15: 0000000000000001 </TASK> ================================================================== --- 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@xxxxxxxxxxxxxxxx. 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
