============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- net/mac80211/iface.c:378 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by dhcpcd/5439: #0: ffffffff8e3d70c8 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x2fc/0x1d70 net/ipv4/devinet.c:1101 stack backtrace: CPU: 1 PID: 5439 Comm: dhcpcd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x1e1/0x300 kernel/locking/lockdep.c:6731 ieee80211_check_concurrent_iface+0x46b/0x950 net/mac80211/iface.c:378 ieee80211_open+0xc1/0x200 net/mac80211/iface.c:466 __dev_open+0x2cb/0x430 net/core/dev.c:1519 __dev_change_flags+0x1e8/0x6a0 net/core/dev.c:8723 dev_change_flags+0x7c/0x1a0 net/core/dev.c:8795 devinet_ioctl+0x949/0x1d70 net/ipv4/devinet.c:1177 inet_ioctl+0x42b/0x560 net/ipv4/af_inet.c:1000 sock_do_ioctl+0xfc/0x310 net/socket.c:1220 sock_ioctl+0x5be/0x7e0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fc7f8ae1378 Code: 00 00 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 07 89 d0 c3 0f 1f 40 00 48 8b 15 49 3a 0d RSP: 002b:00007ffee4f0a008 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000026 RCX: 00007fc7f8ae1378 RDX: 00007ffee4f1a200 RSI: 0000000000008914 RDI: 0000000000000026 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee4f2a3a0 R13: 00007fc7f89e16c8 R14: 0000000000000028 R15: 0000000000008914