RSP: 002b:00007f51fa83a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f51f9c25fa0 RCX: 00007f51f999e159 RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000000000000003 RBP: 00007f51fa83a090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f51f9c26038 R14: 00007f51f9c25fa0 R15: 00007fff553fd388 ============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- net/mac80211/mesh.c:1558 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 locks held by syz.1.1964/12552: 2, last CPU#0: #0: ffffffff902c34e8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217 #1: ffff888066ad07a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: wiphy_lock include/net/cfg80211.h:6890 [inline] #1: ffff888066ad07a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: nl80211_pre_doit+0x3c0/0x890 net/wireless/nl80211.c:19547 stack backtrace: CPU: 0 UID: 0 PID: 12552 Comm: syz.1.1964 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6972 ieee80211_mesh_csa_beacon+0x280/0x2c0 net/mac80211/mesh.c:1558 ieee80211_set_csa_beacon+0x3e2/0x9c0 net/mac80211/cfg.c:4674 __ieee80211_channel_switch net/mac80211/cfg.c:4795 [inline] ieee80211_channel_switch+0x8b0/0xcb0 net/mac80211/cfg.c:4831 rdev_channel_switch+0xfc/0x290 net/wireless/rdev-ops.h:1168 nl80211_channel_switch+0xb8a/0xe90 net/wireless/nl80211.c:12388 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f51f999e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f51fa83a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f51f9c25fa0 RCX: 00007f51f999e159 RDX: 0000000000000000 RSI: 0000200000000200 RDI: 0000000000000003 RBP: 00007f51fa83a090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007f51f9c26038 R14: 00007f51f9c25fa0 R15: 00007fff553fd388