Hello, syzbot found the following issue on: HEAD commit: 67faabbde36b selftests/bpf: Add missing prototypes for sev.. git tree: bpf-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1381363b280000 kernel config: https://syzkaller.appspot.com/x/.config?x=5335204dcdecfda dashboard link: https://syzkaller.appspot.com/bug?extid=881d65229ca4f9ae8c84 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=132faf93280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10532add280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/751a0490d875/disk-67faabbd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2c5106cd9f1f/vmlinux-67faabbd.xz kernel image: https://storage.googleapis.com/syzbot-assets/62c1154294e4/bzImage-67faabbd.xz The issue was bisected to: commit ad2f99aedf8fa77f3ae647153284fa63c43d3055 Author: Arnd Bergmann <arnd@xxxxxxxx> Date: Tue Jul 27 13:45:16 2021 +0000 net: bridge: move bridge ioctls out of .ndo_do_ioctl bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=146de6f1280000 final oops: https://syzkaller.appspot.com/x/report.txt?x=166de6f1280000 console output: https://syzkaller.appspot.com/x/log.txt?x=126de6f1280000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+881d65229ca4f9ae8c84@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: ad2f99aedf8f ("net: bridge: move bridge ioctls out of .ndo_do_ioctl") unregister_netdevice: waiting for bridge0 to become free. Usage count = 2 leaked reference. __netdev_tracker_alloc include/linux/netdevice.h:4070 [inline] netdev_hold include/linux/netdevice.h:4099 [inline] dev_ifsioc+0xbc0/0xeb0 net/core/dev_ioctl.c:408 dev_ioctl+0x250/0x1090 net/core/dev_ioctl.c:605 sock_do_ioctl+0x15a/0x230 net/socket.c:1215 sock_ioctl+0x1f8/0x680 net/socket.c:1318 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd --- 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 bug is already fixed, 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 change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
