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Mon, 07 Sep 2026 18:22:23 -0700 (PDT) Date: Mon, 07 Sep 2026 18:22:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9f634f.6e6c5f9e.28f11f.0004.GAE@google.com> Subject: [syzbot] WARNING in mac80211_hwsim_get_tx_rate From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: df2908090cda Linux 7.3-rc2 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=106f4af9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f dashboard link: https://syzkaller.appspot.com/bug?extid=847847e76c6983a5b3dd compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17c13125580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+847847e76c6983a5b3dd@syzkaller.appspotmail.com ------------[ cut here ]------------ c->control.rates[0].idx < 0 WARNING: ./include/net/mac80211.h:3413 at ieee80211_get_tx_rate include/net/mac80211.h:3413 [inline], CPU#3: syz-executor172/6032 WARNING: ./include/net/mac80211.h:3413 at mac80211_hwsim_get_tx_rate+0x1b3/0x210 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1335, CPU#3: syz-executor172/6032 Modules linked in: CPU: 3 UID: 0 PID: 6032 Comm: syz-executor172 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:ieee80211_get_tx_rate include/net/mac80211.h:3413 [inline] RIP: 0010:mac80211_hwsim_get_tx_rate+0x1b3/0x210 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1335 Code: 80 3c 02 00 75 6c 48 8b 43 08 48 8d 54 6d 00 48 8d 1c 90 e8 bf e7 a9 fa 48 89 d8 5b 5d 41 5c e9 83 4d 71 04 e8 ae e7 a9 fa 90 <0f> 0b 90 31 db eb e2 e8 61 22 1d fb e9 e8 fe ff ff e8 b7 22 1d fb RSP: 0018:ffffc90003ed70d8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88803656d068 RCX: 0000000000000402 RDX: ffff88802b10cb00 RSI: ffffffff87622962 RDI: ffff88802b10cb00 RBP: ffffffffffffffff R08: 0000000000000001 R09: 0000000000000000 R10: 00000000000000ff R11: 0000000000000000 R12: ffff8880551d0f40 R13: ffff88803638970b R14: ffff8880551d7bc8 R15: 0000000000000064 FS: 0000555584784400(0000) GS:ffff8880d5e5d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f97934f4eb8 CR3: 000000003f0f4000 CR4: 0000000000352ef0 Call Trace: mac80211_hwsim_write_tsf+0x89/0x460 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1617 mac80211_hwsim_tx_frame_no_nl+0x12c/0x1830 drivers/net/wireless/virtual/mac80211_hwsim_main.c:1913 mac80211_hwsim_tx+0xf43/0x29d0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:2276 drv_tx net/mac80211/driver-ops.h:38 [inline] ieee80211_tx_frags+0x5c9/0xa70 net/mac80211/tx.c:1753 __ieee80211_tx+0x145/0x5b0 net/mac80211/tx.c:1808 ieee80211_tx+0x336/0x460 net/mac80211/tx.c:1991 ieee80211_xmit+0x30f/0x3e0 net/mac80211/tx.c:2083 ieee80211_monitor_start_xmit+0xf09/0x12b0 net/mac80211/tx.c:2486 __netdev_start_xmit include/linux/netdevice.h:5429 [inline] netdev_start_xmit include/linux/netdevice.h:5438 [inline] xmit_one net/core/dev.c:3937 [inline] dev_hard_start_xmit+0x121/0x760 net/core/dev.c:3953 __dev_queue_xmit+0x1bbf/0x4970 net/core/dev.c:4926 dev_queue_xmit include/linux/netdevice.h:3461 [inline] packet_xmit+0x243/0x310 net/packet/af_packet.c:277 packet_snd net/packet/af_packet.c:3111 [inline] packet_sendmsg+0x30bc/0x4ef0 net/packet/af_packet.c:3143 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:815 [inline] __sys_sendto+0x48b/0x4e0 net/socket.c:2281 __do_sys_sendto net/socket.c:2288 [inline] __se_sys_sendto net/socket.c:2284 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2284 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd5261b7f57 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffffd9355c0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000555584784400 RCX: 00007fd5261b7f57 RDX: 0000000000000021 RSI: 00007ffffd935650 RDI: 0000000000000003 RBP: 00007ffffd935620 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a R13: 0000000000000003 R14: 0000000000000026 R15: 00007fd5261f104e --- 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