Hello, syzbot found the following issue on:
HEAD commit: 5b032cac6225 Merge tag 'ubifs-for-linus-6.16-rc1' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14d0820c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=529cf323140e1748 dashboard link: https://syzkaller.appspot.com/bug?extid=fe68c78fbbd3c0ad70ee compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2e197ad38b02/disk-5b032cac.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f05af0a6e9f6/vmlinux-5b032cac.xz kernel image: https://storage.googleapis.com/syzbot-assets/d7c0456f7931/bzImage-5b032cac.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fe68c78fbbd3c0ad7...@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ieee802154_max_payload+0x399/0x3c0 net/ieee802154/header_ops.c:372 ieee802154_max_payload+0x399/0x3c0 net/ieee802154/header_ops.c:372 ieee802154_header_create+0x99b/0xb90 net/mac802154/iface.c:403 wpan_dev_hard_header include/net/cfg802154.h:525 [inline] dgram_sendmsg+0xb3d/0x16d0 net/ieee802154/socket.c:677 ieee802154_sock_sendmsg+0x92/0xd0 net/ieee802154/socket.c:96 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2655 x64_sys_call+0x32fb/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable hdr created at: ieee802154_header_create+0x4e/0xb90 net/mac802154/iface.c:360 wpan_dev_hard_header include/net/cfg802154.h:525 [inline] dgram_sendmsg+0xb3d/0x16d0 net/ieee802154/socket.c:677 CPU: 1 UID: 0 PID: 17215 Comm: syz.9.2647 Not tainted 6.15.0-syzkaller-13659-g5b032cac6225 #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ===================================================== --- 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 syzkal...@googlegroups.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
