Warning: Permanently added '10.128.0.161' (ED25519) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 67.355256][ T3174] [ 67.357977][ T3174] ============================================ [ 67.364369][ T3174] WARNING: possible recursive locking detected [ 67.371035][ T3174] 5.15.153-syzkaller #0 Not tainted [ 67.376719][ T3174] -------------------------------------------- [ 67.383148][ T3174] dhcpcd/3174 is trying to acquire lock: [ 67.389173][ T3174] ffffffff8dad4258 (unix_gc_lock){+.+.}-{2:2}, at: unix_notinflight+0x29a/0x390 [ 67.399381][ T3174] executing program executing program [ 67.399381][ T3174] but task is already holding lock: [ 67.407434][ T3174] ffffffff8dad4258 (unix_gc_lock){+.+.}-{2:2}, at: unix_gc+0x115/0x1380 [ 67.416512][ T3174] [ 67.416512][ T3174] other info that might help us debug this: [ 67.425250][ T3174] Possible unsafe locking scenario: [ 67.425250][ T3174] [ 67.433694][ T3174] CPU0 [ 67.437017][ T3174] ---- [ 67.440337][ T3174] lock(unix_gc_lock); [ 67.444962][ T3174] lock(unix_gc_lock); [ 67.449130][ T3174] [ 67.449130][ T3174] *** DEADLOCK *** executing program [ 67.449130][ T3174] [ 67.457926][ T3174] May be due to missing lock nesting notation [ 67.457926][ T3174] [ 67.466772][ T3174] 2 locks held by dhcpcd/3174: [ 67.472291][ T3174] #0: ffff888074593810 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x98/0x230 [ 67.484107][ T3174] #1: ffffffff8dad4258 (unix_gc_lock){+.+.}-{2:2}, at: unix_gc+0x115/0x1380 [ 67.493641][ T3174] [ 67.493641][ T3174] stack backtrace: [ 67.500389][ T3174] CPU: 1 PID: 3174 Comm: dhcpcd Not tainted 5.15.153-syzkaller #0 [ 67.508619][ T3174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 67.519243][ T3174] Call Trace: [ 67.522588][ T3174] [ 67.525658][ T3174] dump_stack_lvl+0x1e3/0x2cb [ 67.530510][ T3174] ? io_uring_drop_tctx_refs+0x19d/0x19d [ 67.536394][ T3174] ? panic+0x84d/0x84d [ 67.540881][ T3174] validate_chain+0x46d2/0x5930 [ 67.546006][ T3174] ? reacquire_held_locks+0x660/0x660 [ 67.551707][ T3174] ? reacquire_held_locks+0x660/0x660 [ 67.557289][ T3174] ? validate_chain+0x13bd/0x5930 [ 67.564197][ T3174] ? mark_lock+0x98/0x340 [ 67.569584][ T3174] __lock_acquire+0x1295/0x1ff0 [ 67.574857][ T3174] lock_acquire+0x1db/0x4f0 [ 67.579397][ T3174] ? unix_notinflight+0x29a/0x390 [ 67.584717][ T3174] ? read_lock_is_recursive+0x10/0x10 [ 67.590183][ T3174] ? read_lock_is_recursive+0x10/0x10 [ 67.595957][ T3174] ? __rwlock_init+0x140/0x140 [ 67.600757][ T3174] _raw_spin_lock+0x2a/0x40 [ 67.605275][ T3174] ? unix_notinflight+0x29a/0x390 [ 67.610520][ T3174] unix_notinflight+0x29a/0x390 [ 67.615499][ T3174] unix_destruct_scm+0x21d/0x350 [ 67.620541][ T3174] ? do_raw_spin_unlock+0x137/0x8b0 [ 67.626018][ T3174] ? unix_detach_fds+0x190/0x190 [ 67.631078][ T3174] ? mark_lock+0x98/0x340 [ 67.635527][ T3174] ? inc_inflight_move_tail+0x1b0/0x1b0 [ 67.641665][ T3174] skb_release_head_state+0xf9/0x230 [ 67.647422][ T3174] kfree_skb_reason+0x82/0x170 [ 67.653023][ T3174] unix_gc+0xb2b/0x1380 [ 67.657777][ T3174] ? wait_for_unix_gc+0x210/0x210 [ 67.663067][ T3174] ? kmem_cache_free+0x146/0x1f0 [ 67.668215][ T3174] ? __sk_destruct+0x57f/0x840 [ 67.673185][ T3174] unix_release_sock+0x91c/0xaa0 [ 67.678293][ T3174] ? unix_stream_read_sock+0x90/0x90 [ 67.683773][ T3174] ? down_write+0x10e/0x170 [ 67.688652][ T3174] ? down_read_killable+0x350/0x350 [ 67.694243][ T3174] unix_release+0x88/0xc0 [ 67.698864][ T3174] sock_close+0xcd/0x230 [ 67.703239][ T3174] ? sock_mmap+0x90/0x90 [ 67.708073][ T3174] __fput+0x3bf/0x890 [ 67.713750][ T3174] task_work_run+0x129/0x1a0 [ 67.718820][ T3174] exit_to_user_mode_loop+0x106/0x130 [ 67.725266][ T3174] exit_to_user_mode_prepare+0xb1/0x140 [ 67.732270][ T3174] syscall_exit_to_user_mode+0x5d/0x250 [ 67.737962][ T3174] do_syscall_64+0x49/0xb0 [ 67.742498][ T3174] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 67.748422][ T3174] RIP: 0033:0x7fdede9980a8 [ 67.753724][ T3174] Code: 48 8b 05 83 9d 0d 00 64 c7 00 16 00 00 00 83 c8 ff 48 83 c4 20 5b c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 5b 48 8b 15 51 9d 0d 00 f7 d8 64 89 02 48 83 [ 67.775492][ T3174] RSP: 002b:00007ffc93f31cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 67.784725][ T3174] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007fdede9980a8 [ 67.792875][ T3174] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000005 [ 67.801230][ T3174] RBP: 00007ffc93f520a8 R08: 0000000000000007 R09: 69906f7023515725 [ 67.809331][ T3174] R10: 0000000000004000 R11: 0000000000000246 R12: 00005620c764d4e0 [ 67.818265][ T3174] R13: 00007ffc93f41ee8 R14: 0000000000000148 R15: 0000000000000004 [ 67.826921][ T3174]