Hello, syzbot found the following issue on:
HEAD commit: ee88bddf7f2f Merge tag 'bpf-fixes' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12b1db70580000 kernel config: https://syzkaller.appspot.com/x/.config?x=595d344ff0b23ac5 dashboard link: https://syzkaller.appspot.com/bug?extid=1daa6a8aecb922ad3c30 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/405f6113ec86/disk-ee88bddf.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/57f4fa239393/vmlinux-ee88bddf.xz kernel image: https://storage.googleapis.com/syzbot-assets/32892fe29e1c/bzImage-ee88bddf.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: [email protected] ===================================================== BUG: KMSAN: uninit-value in batadv_mcast_mla_is_duplicate net/batman-adv/multicast.c:347 [inline] BUG: KMSAN: uninit-value in batadv_mcast_mla_tt_retract net/batman-adv/multicast.c:692 [inline] BUG: KMSAN: uninit-value in __batadv_mcast_mla_update net/batman-adv/multicast.c:920 [inline] BUG: KMSAN: uninit-value in batadv_mcast_mla_update+0x35f4/0x4f80 net/batman-adv/multicast.c:948 batadv_mcast_mla_is_duplicate net/batman-adv/multicast.c:347 [inline] batadv_mcast_mla_tt_retract net/batman-adv/multicast.c:692 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:920 [inline] batadv_mcast_mla_update+0x35f4/0x4f80 net/batman-adv/multicast.c:948 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402 kthread+0xd5c/0xf00 kernel/kthread.c:464 ret_from_fork+0x1e3/0x310 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Uninit was created at: slab_post_alloc_hook mm/slub.c:4154 [inline] slab_alloc_node mm/slub.c:4197 [inline] __kmalloc_cache_noprof+0x7f7/0xed0 mm/slub.c:4354 kmalloc_noprof include/linux/slab.h:905 [inline] batadv_mcast_mla_meshif_get_ipv6 net/batman-adv/multicast.c:477 [inline] batadv_mcast_mla_meshif_get net/batman-adv/multicast.c:535 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:911 [inline] batadv_mcast_mla_update+0x1c17/0x4f80 net/batman-adv/multicast.c:948 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3321 worker_thread+0xedf/0x1590 kernel/workqueue.c:3402 kthread+0xd5c/0xf00 kernel/kthread.c:464 ret_from_fork+0x1e3/0x310 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 CPU: 1 UID: 0 PID: 68 Comm: kworker/u8:4 Tainted: G W 6.16.0-rc3-syzkaller-00072-gee88bddf7f2f #0 PREEMPT(undef) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: bat_events batadv_mcast_mla_update ===================================================== --- 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 [email protected]. 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
