last executing test programs: kernel console output (not intermixed with test programs): Warning: Permanently added '10.128.1.16' (ED25519) to the list of known hosts. [ 81.575441][ T5816] cgroup: Unknown subsys name 'net' [ 81.674036][ T5816] cgroup: Unknown subsys name 'cpuset' [ 81.683467][ T5816] cgroup: Unknown subsys name 'rlimit' Setting up swapspace version 1, size = 127995904 bytes [ 83.344691][ T5816] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 85.579573][ T5827] [ 85.582293][ T5827] ============================= [ 85.587174][ T5827] WARNING: suspicious RCU usage [ 85.592131][ T5827] 6.16.0-rc4-next-20250701-syzkaller #0 Not tainted [ 85.598874][ T5827] ----------------------------- [ 85.604029][ T5827] fs/proc/proc_sysctl.c:934 suspicious rcu_dereference_check() usage! [ 85.612292][ T5827] [ 85.612292][ T5827] other info that might help us debug this: [ 85.612292][ T5827] [ 85.622657][ T5827] [ 85.622657][ T5827] rcu_scheduler_active = 2, debug_locks = 1 [ 85.630932][ T5827] 3 locks held by syz-executor/5827: [ 85.636456][ T5827] #0: ffff888034afc428 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 85.645939][ T5827] #1: ffff88802f507c00 (&sb->s_type->i_mutex_key#10){++++}-{4:4}, at: path_openat+0x8cb/0x3830 [ 85.656564][ T5827] #2: ffff888011a793e8 (&lockref->lock){+.+.}-{3:3}, at: d_alloc_parallel+0xbe4/0x15e0 [ 85.666652][ T5827] [ 85.666652][ T5827] stack backtrace: [ 85.672740][ T5827] CPU: 1 UID: 0 PID: 5827 Comm: syz-executor Not tainted 6.16.0-rc4-next-20250701-syzkaller #0 PREEMPT(full) [ 85.672772][ T5827] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 85.672793][ T5827] Call Trace: [ 85.672801][ T5827] [ 85.672810][ T5827] dump_stack_lvl+0x189/0x250 [ 85.672854][ T5827] ? __pfx_dump_stack_lvl+0x10/0x10 [ 85.672897][ T5827] ? __pfx__printk+0x10/0x10 [ 85.672937][ T5827] lockdep_rcu_suspicious+0x140/0x1d0 [ 85.672974][ T5827] proc_sys_compare+0x27d/0x2c0 [ 85.673003][ T5827] ? __pfx_proc_sys_compare+0x10/0x10 [ 85.673033][ T5827] d_alloc_parallel+0x105d/0x15e0 [ 85.673075][ T5827] ? d_alloc_parallel+0x2f0/0x15e0 [ 85.673112][ T5827] ? __pfx_d_alloc_parallel+0x10/0x10 [ 85.673140][ T5827] ? __pfx_default_wake_function+0x10/0x10 [ 85.673184][ T5827] path_openat+0xa3b/0x3830 [ 85.673210][ T5827] ? arch_stack_walk+0xfc/0x150 [ 85.673271][ T5827] ? getname_flags+0xb8/0x540 [ 85.673302][ T5827] ? __pfx_path_openat+0x10/0x10 [ 85.673328][ T5827] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.673373][ T5827] do_filp_open+0x1fa/0x410 [ 85.673400][ T5827] ? __lock_acquire+0xab9/0xd20 [ 85.673428][ T5827] ? __pfx_do_filp_open+0x10/0x10 [ 85.673482][ T5827] ? _raw_spin_unlock+0x28/0x50 [ 85.673509][ T5827] ? alloc_fd+0x64c/0x6c0 [ 85.673543][ T5827] do_sys_openat2+0x121/0x1c0 [ 85.673573][ T5827] ? __pfx_do_sys_openat2+0x10/0x10 [ 85.673600][ T5827] ? exc_page_fault+0x76/0xf0 [ 85.673634][ T5827] ? do_user_addr_fault+0xc8a/0x1390 [ 85.673665][ T5827] __x64_sys_openat+0x138/0x170 [ 85.673697][ T5827] do_syscall_64+0xfa/0x3b0 [ 85.673728][ T5827] ? lockdep_hardirqs_on+0x9c/0x150 [ 85.673759][ T5827] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.673780][ T5827] ? clear_bhb_loop+0x60/0xb0 [ 85.673807][ T5827] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 85.673828][ T5827] RIP: 0033:0x7fbbbf58d211 [ 85.673853][ T5827] Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d 3a 83 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 [ 85.673871][ T5827] RSP: 002b:00007ffc00a3d2f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 [ 85.673903][ T5827] RAX: ffffffffffffffda RBX: 0000000000080001 RCX: 00007fbbbf58d211 [ 85.673918][ T5827] RDX: 0000000000080001 RSI: 00007fbbbf62aeb2 RDI: 00000000ffffff9c [ 85.673932][ T5827] RBP: 00007fbbbf62aeb2 R08: 0000000000000000 R09: 0000000000000000 [ 85.673945][ T5827] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000015 [ 85.673958][ T5827] R13: 00007ffc00a3d390 R14: 0000000000000009 R15: 0000000000000000 SYZFAIL: failed to recv rpc fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor) [ 85.673990][ T5827]