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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5d4809e25903 Add linux-next specific files for 20250620 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=131c5b0c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=58afc4b78b52b7e3 dashboard link: https://syzkaller.appspot.com/bug?extid=0141c834e47059395621 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138a2dd4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171c5b0c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/16492bf6b788/disk-5d4809e2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7be284ded1de/vmlinux-5d4809e2.xz kernel image: https://storage.googleapis.com/syzbot-assets/467d717f0d9c/bzImage-5d4809e2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0141c834e47059395621@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: net/ipv6/ip6mr.c:2376 at ip6_mr_output+0xe0b/0x1040 net/ipv6/ip6mr.c:2376, CPU#1: kworker/1:2/121 Modules linked in: CPU: 1 UID: 0 PID: 121 Comm: kworker/1:2 Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: wg-crypt-wg2 wg_packet_tx_worker RIP: 0010:ip6_mr_output+0xe0b/0x1040 net/ipv6/ip6mr.c:2376 Code: f7 49 bd 00 00 00 00 00 fc ff df 48 8b 74 24 38 45 31 f6 31 ff ba 02 00 00 00 e8 c0 23 1b ff e9 a7 fd ff ff e8 b6 62 8e f7 90 <0f> 0b 90 e9 c7 f3 ff ff e8 a8 62 8e f7 90 0f 0b 90 43 80 3c 2e 00 RSP: 0018:ffffc90002dd74e0 EFLAGS: 00010293 RAX: ffffffff8a31f62a RBX: 0000000000000000 RCX: ffff88801db93c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002dd7758 R08: ffffc90002dd76c7 R09: 0000000000000000 R10: ffffc90002dd7670 R11: fffff520005baed9 R12: 1ffff920005baeac R13: dffffc0000000000 R14: ffffc90002dd7670 R15: ffff888027bea8c0 FS: 0000000000000000(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f04da8d0100 CR3: 000000007786c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip6tunnel_xmit include/net/ip6_tunnel.h:162 [inline] udp_tunnel6_xmit_skb+0x640/0xad0 net/ipv6/ip6_udp_tunnel.c:112 send6+0x5ac/0x8d0 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1c8/0x7c0 drivers/net/wireguard/send.c:276 process_one_work kernel/workqueue.c:3239 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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@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 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