last executing test programs: kernel console output (not intermixed with test programs): Warning: Permanently added '10.128.1.192' (ED25519) to the list of known hosts. syzkaller login: [ 68.217045][ T5834] cgroup: Unknown subsys name 'net' [ 68.331051][ T5834] cgroup: Unknown subsys name 'cpuset' [ 68.339993][ T5834] cgroup: Unknown subsys name 'rlimit' Setting up swapspace version 1, size = 127995904 bytes [ 69.672970][ T5834] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 71.411356][ T5844] [ 71.413851][ T5844] ============================= [ 71.418749][ T5844] WARNING: suspicious RCU usage [ 71.423684][ T5844] 6.16.0-rc4-next-20250703-syzkaller #0 Not tainted [ 71.430272][ T5844] ----------------------------- [ 71.435110][ T5844] fs/proc/proc_sysctl.c:934 suspicious rcu_dereference_check() usage! [ 71.443351][ T5844] [ 71.443351][ T5844] other info that might help us debug this: [ 71.443351][ T5844] [ 71.453702][ T5844] [ 71.453702][ T5844] rcu_scheduler_active = 2, debug_locks = 1 [ 71.461905][ T5844] 3 locks held by syz-executor/5844: [ 71.467214][ T5844] #0: ffff88807dcbe428 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 71.476446][ T5844] #1: ffff888025b956d0 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: path_openat+0x8cb/0x3830 [ 71.487009][ T5844] #2: ffff88807e4653e8 (&lockref->lock){+.+.}-{3:3}, at: d_alloc_parallel+0xace/0x15e0 [ 71.496898][ T5844] [ 71.496898][ T5844] stack backtrace: [ 71.502803][ T5844] CPU: 1 UID: 0 PID: 5844 Comm: syz-executor Not tainted 6.16.0-rc4-next-20250703-syzkaller #0 PREEMPT(full) [ 71.502817][ T5844] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 71.502827][ T5844] Call Trace: [ 71.502831][ T5844] [ 71.502836][ T5844] dump_stack_lvl+0x189/0x250 [ 71.502852][ T5844] ? __pfx_dump_stack_lvl+0x10/0x10 [ 71.502866][ T5844] ? __pfx__printk+0x10/0x10 [ 71.502885][ T5844] lockdep_rcu_suspicious+0x140/0x1d0 [ 71.502897][ T5844] proc_sys_compare+0x27d/0x2c0 [ 71.502906][ T5844] ? __pfx_proc_sys_compare+0x10/0x10 [ 71.502916][ T5844] d_alloc_parallel+0x105d/0x15e0 [ 71.502936][ T5844] ? d_alloc_parallel+0x2f0/0x15e0 [ 71.502952][ T5844] ? __pfx_d_alloc_parallel+0x10/0x10 [ 71.502973][ T5844] path_openat+0xa3b/0x3830 [ 71.502980][ T5844] ? arch_stack_walk+0xfc/0x150 [ 71.503007][ T5844] ? __pfx_path_openat+0x10/0x10 [ 71.503014][ T5844] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.503033][ T5844] do_filp_open+0x1fa/0x410 [ 71.503040][ T5844] ? __lock_acquire+0xab9/0xd20 [ 71.503054][ T5844] ? __pfx_do_filp_open+0x10/0x10 [ 71.503074][ T5844] ? _raw_spin_unlock+0x28/0x50 [ 71.503087][ T5844] ? alloc_fd+0x64c/0x6c0 [ 71.503103][ T5844] do_sys_openat2+0x121/0x1c0 [ 71.503117][ T5844] ? __pfx_do_sys_openat2+0x10/0x10 [ 71.503128][ T5844] ? fput_close_sync+0x119/0x200 [ 71.503141][ T5844] ? __pfx_fput_close_sync+0x10/0x10 [ 71.503157][ T5844] __x64_sys_openat+0x138/0x170 [ 71.503172][ T5844] do_syscall_64+0xfa/0x3b0 [ 71.503181][ T5844] ? lockdep_hardirqs_on+0x9c/0x150 [ 71.503190][ T5844] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.503198][ T5844] ? clear_bhb_loop+0x60/0xb0 [ 71.503209][ T5844] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 71.503218][ T5844] RIP: 0033:0x7f21a6b8d211 [ 71.503231][ T5844] Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d 3a 93 1f 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 93 00 00 00 48 8b 54 24 28 64 48 2b 14 25 [ 71.503237][ T5844] RSP: 002b:00007fffcb45aa70 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 SYZFAIL: failed to recv rpc fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor) [ 71.503248][ T5844] RAX: ffffffffffffffda RBX: 0000000000080001 RCX: 00007f21a6b8d211 [ 71.503254][ T5844] RDX: 0000000000080001 RSI: 00007f21a6c2afe1 RDI: 00000000ffffff9c [ 71.503259][ T5844] RBP: 00007f21a6c2afe1 R08: 0000000000000000 R09: 0000000000000000 [ 71.503265][ T5844] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000009 [ 71.503270][ T5844] R13: 00007fffcb45ab10 R14: 0000000000000009 R15: 0000000000000000 [ 71.503284][ T5844] [ 71.789390][ T1300] ieee802154 phy0 wpan0: encryption failed: -22 [ 71.795975][ T1300] ieee802154 phy1 wpan1: encryption failed: -22