bisecting fixing commit since 6642d600b541b81931fb1ab0c041b0d68f77be7e building syzkaller on fc9fd31ee7998c8b747752791000ea4eef07b5c6 testing commit 6642d600b541b81931fb1ab0c041b0d68f77be7e with gcc (GCC) 10.2.1 20210217 kernel signature: 57522ea5732665f3f5d7831987f6fe44e513ad96f1837f9356f28c72aa52d8cc all runs: crashed: WARNING in cfg80211_inform_single_bss_frame_data testing current HEAD 280d542f6ffac0e6d65dc267f92191d509b13b64 testing commit 280d542f6ffac0e6d65dc267f92191d509b13b64 with gcc (GCC) 10.2.1 20210217 kernel signature: 8aa9d7311f87dc4c6ea96f3e7206c08702ed496731078701fd112885c8429e00 all runs: crashed: WARNING in cfg80211_inform_single_bss_frame_data revisions tested: 2, total time: 19m13.991947882s (build: 11m50.186418767s, test: 6m54.292794378s) the crash still happens on HEAD commit msg: Merge tag 'drm-fixes-2021-03-05' of git://anongit.freedesktop.org/drm/drm crash: WARNING in cfg80211_inform_single_bss_frame_data ------------[ cut here ]------------ WARNING: CPU: 0 PID: 10198 at net/wireless/scan.c:2337 cpu_max_bits_warn include/linux/cpumask.h:137 [inline] WARNING: CPU: 0 PID: 10198 at net/wireless/scan.c:2337 cpumask_check include/linux/cpumask.h:144 [inline] WARNING: CPU: 0 PID: 10198 at net/wireless/scan.c:2337 cpumask_test_cpu include/linux/cpumask.h:373 [inline] WARNING: CPU: 0 PID: 10198 at net/wireless/scan.c:2337 trace_cfg80211_inform_bss_frame net/wireless/trace.h:3262 [inline] WARNING: CPU: 0 PID: 10198 at net/wireless/scan.c:2337 cfg80211_inform_single_bss_frame_data+0xa21/0xc70 net/wireless/scan.c:2317 Modules linked in: CPU: 0 PID: 10198 Comm: syz-executor.1 Not tainted 5.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cfg80211_inform_single_bss_frame_data+0xa21/0xc70 net/wireless/scan.c:2337 Code: 24 0c 4c 89 ee 4c 89 e7 e8 1c ea fe ff e9 7f fc ff ff 0f 0b 45 31 e4 e9 81 fc ff ff 0f 0b e9 7a fc ff ff 0f 0b e9 8b f6 ff ff <0f> 0b 45 31 e4 e9 69 fc ff ff 0f 0b e9 4d fe ff ff e8 29 cf cd f9 RSP: 0018:ffffc90000007660 EFLAGS: 00010246 RAX: 0000000000000080 RBX: ffffc90000007bd0 RCX: 0000000000000001 RDX: 0000000000000080 RSI: ffffffff888ae260 RDI: ffff88802557065c RBP: 1ffff92000000ed4 R08: 0000000000000000 R09: ffffffff8c36d44f R10: fffffbfff186da89 R11: 0000000000000001 R12: ffff888025570580 R13: 0000000000000023 R14: ffff88802b389800 R15: 0000000000000000 FS: 00007f836bf98700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f836bf96ff8 CR3: 000000002e12e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cfg80211_inform_bss_frame_data+0x94/0xa80 net/wireless/scan.c:2433 ieee80211_bss_info_update+0x29b/0x890 net/mac80211/scan.c:190 ieee80211_scan_rx+0x31e/0x5f0 net/mac80211/scan.c:299 __ieee80211_rx_handle_packet net/mac80211/rx.c:4627 [inline] ieee80211_rx_list+0x1957/0x2370 net/mac80211/rx.c:4819 ieee80211_rx_napi+0xc4/0x330 net/mac80211/rx.c:4842 ieee80211_rx include/net/mac80211.h:4524 [inline] ieee80211_tasklet_handler+0xe9/0x100 net/mac80211/main.c:235 tasklet_action_common.constprop.0+0x1d7/0x2d0 kernel/softirq.c:557 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 do_softirq.part.0+0xc8/0x110 kernel/softirq.c:248 do_softirq kernel/softirq.c:240 [inline] __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:198 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] __dev_queue_xmit+0x1556/0x26a0 net/core/dev.c:4209 __netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:321 [inline] netlink_deliver_tap+0x793/0x990 net/netlink/af_netlink.c:334 __netlink_sendskb net/netlink/af_netlink.c:1256 [inline] netlink_sendskb net/netlink/af_netlink.c:1265 [inline] netlink_unicast+0x566/0x700 net/netlink/af_netlink.c:1353 netlink_ack+0x448/0x9f0 net/netlink/af_netlink.c:2472 netlink_rcv_skb+0x264/0x370 net/netlink/af_netlink.c:2508 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x42e/0x700 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x70e/0xbe0 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:674 __sys_sendto+0x1a4/0x270 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xd8/0x1b0 net/socket.c:1985 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x418f9c Code: fa fa ff ff 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 20 fb ff ff 48 8b RSP: 002b:00007f836bf97040 EFLAGS: 00000293 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f836bf970f0 RCX: 0000000000418f9c RDX: 0000000000000058 RSI: 00007f836bf97140 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f836bf97084 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000004 R14: 0000000000000000 R15: 00007f836bf97140