Hello, syzbot found the following issue on: HEAD commit: 66c55602 skbuff: back tiny skbs with kmalloc() in __netdev.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=121bf89f500000 kernel config: https://syzkaller.appspot.com/x/.config?x=c60c9ff9cc916cbc dashboard link: https://syzkaller.appspot.com/bug?extid=95c52e652a2fac1fcdf5 compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+95c52e652a2fac1fcdf5@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 25700 at net/wireless/scan.c:1565 cfg80211_combine_bsses net/wireless/scan.c:1565 [inline] WARNING: CPU: 1 PID: 25700 at net/wireless/scan.c:1565 cfg80211_bss_update+0x16cd/0x1c60 net/wireless/scan.c:1746 Modules linked in: CPU: 1 PID: 25700 Comm: kworker/u4:15 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy12 ieee80211_iface_work RIP: 0010:cfg80211_combine_bsses net/wireless/scan.c:1565 [inline] RIP: 0010:cfg80211_bss_update+0x16cd/0x1c60 net/wireless/scan.c:1746 Code: 00 48 c7 c7 20 8c 61 8a c6 05 88 7d b9 04 01 e8 a7 15 83 00 e9 27 ff ff ff e8 8f f0 3c f9 0f 0b e9 c2 f4 ff ff e8 83 f0 3c f9 <0f> 0b 4c 89 f7 e8 89 be 8c fb 31 ff 89 c6 88 44 24 70 e8 ec f6 3c RSP: 0000:ffffc90002e46f50 EFLAGS: 00010212 RAX: 00000000000026ce RBX: 0000000000000001 RCX: ffffc90015d60000 RDX: 0000000000040000 RSI: ffffffff8835d93d RDI: 0000000000000003 RBP: ffff88802f58fc00 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8835d08d R11: 0000000000000000 R12: ffff888022182c68 R13: 0000000000000005 R14: ffff88802f58fc10 R15: ffff888022182c00 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ee27000 CR3: 00000000144e2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cfg80211_inform_single_bss_frame_data+0x6e2/0xe90 net/wireless/scan.c:2400 cfg80211_inform_bss_frame_data+0xa7/0xb10 net/wireless/scan.c:2433 ieee80211_bss_info_update+0x3ce/0xb20 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1126 [inline] ieee80211_rx_mgmt_probe_beacon+0xccd/0x16b0 net/mac80211/ibss.c:1615 ieee80211_ibss_rx_queued_mgmt+0xe3e/0x1870 net/mac80211/ibss.c:1642 ieee80211_iface_work+0x761/0x9e0 net/mac80211/iface.c:1423 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 --- 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.