./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4003073585 <...> Warning: Permanently added '10.128.0.108' (ED25519) to the list of known hosts. execve("./syz-executor4003073585", ["./syz-executor4003073585"], 0x7ffdd0e59dc0 /* 10 vars */) = 0 brk(NULL) = 0x55556c73e000 brk(0x55556c73ed00) = 0x55556c73ed00 arch_prctl(ARCH_SET_FS, 0x55556c73e380) = 0 set_tid_address(0x55556c73e650) = 5065 set_robust_list(0x55556c73e660, 24) = 0 rseq(0x55556c73eca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor4003073585", 4096) = 28 getrandom("\x5c\x76\x7d\x76\xba\x77\x06\x38", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556c73ed00 brk(0x55556c75fd00) = 0x55556c75fd00 brk(0x55556c760000) = 0x55556c760000 mprotect(0x7fcbbcc11000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=5, value_size=2, max_entries=1, map_flags=BPF_F_NO_PREALLOC|BPF_F_NUMA_NODE, inner_map_fd=-1, numa_node=0, map_name="", map_ifindex=0, btf_fd=-1, btf_key_type_id=0, btf_value_type_id=0, btf_vmlinux_value_type_id=0, map_extra=0}, 72) = 3 bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_UNSPEC, insn_cnt=12, insns=0x20000440, license=NULL, log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=-1, func_info_rec_size=0, func_info=NULL, func_info_cnt=0, line_info_rec_size=0, line_info=NULL, line_info_cnt=0, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EFAULT (Bad address) bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000300, value=0x20000540, flags=BPF_ANY}, 32) = 0 bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_RAW_TRACEPOINT, insn_cnt=12, insns=0x20000440, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=-1, func_info_rec_size=0, func_info=NULL, func_info_cnt=0, line_info_rec_size=0, line_info=NULL, line_info_cnt=0, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = 4 bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="kfree", prog_fd=4}}, 16) = 5 [ 53.199894][ T5065] [ 53.202270][ T5065] ============================================ [ 53.208396][ T5065] WARNING: possible recursive locking detected [ 53.214536][ T5065] 6.8.0-syzkaller-05236-g443574b03387 #0 Not tainted [ 53.221193][ T5065] -------------------------------------------- [ 53.227329][ T5065] syz-executor400/5065 is trying to acquire lock: [ 53.233718][ T5065] ffff888020b739f8 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x96/0x6a0 [ 53.242585][ T5065] [ 53.242585][ T5065] but task is already holding lock: [ 53.249923][ T5065] ffff888020b739f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 53.258781][ T5065] [ 53.258781][ T5065] other info that might help us debug this: [ 53.266813][ T5065] Possible unsafe locking scenario: [ 53.266813][ T5065] [ 53.274236][ T5065] CPU0 [ 53.277491][ T5065] ---- [ 53.280742][ T5065] lock(&trie->lock); [ 53.284783][ T5065] lock(&trie->lock); [ 53.288824][ T5065] [ 53.288824][ T5065] *** DEADLOCK *** [ 53.288824][ T5065] [ 53.296938][ T5065] May be due to missing lock nesting notation [ 53.296938][ T5065] [ 53.305227][ T5065] 3 locks held by syz-executor400/5065: [ 53.310741][ T5065] #0: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x3c4/0x540 [ 53.320629][ T5065] #1: ffff888020b739f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xcb/0xc10 [ 53.329904][ T5065] #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x114/0x420 [ 53.339263][ T5065] [ 53.339263][ T5065] stack backtrace: [ 53.345122][ T5065] CPU: 1 PID: 5065 Comm: syz-executor400 Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0 [ 53.355156][ T5065] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 [ 53.365187][ T5065] Call Trace: [ 53.368463][ T5065] [ 53.371372][ T5065] dump_stack_lvl+0x1e7/0x2e0 [ 53.376038][ T5065] ? __pfx_dump_stack_lvl+0x10/0x10 [ 53.381211][ T5065] ? print_deadlock_bug+0x479/0x620 [ 53.386383][ T5065] ? _find_first_zero_bit+0xd4/0x100 [ 53.391646][ T5065] validate_chain+0x15c1/0x58e0 [ 53.396476][ T5065] ? validate_chain+0x11b/0x58e0 [ 53.401392][ T5065] ? __pfx_validate_chain+0x10/0x10 [ 53.406564][ T5065] ? mark_lock+0x9a/0x350 [ 53.410870][ T5065] ? __lock_acquire+0x1346/0x1fd0 [ 53.415871][ T5065] ? mark_lock+0x9a/0x350 [ 53.420176][ T5065] ? __pfx_validate_chain+0x10/0x10 [ 53.425348][ T5065] ? mark_lock+0x9a/0x350 [ 53.429652][ T5065] ? __pfx_lock_acquire+0x10/0x10 [ 53.434649][ T5065] __lock_acquire+0x1346/0x1fd0 [ 53.439477][ T5065] lock_acquire+0x1e4/0x530 [ 53.443953][ T5065] ? trie_delete_elem+0x96/0x6a0 [ 53.448869][ T5065] ? __pfx_lock_acquire+0x10/0x10 [ 53.453866][ T5065] ? __lock_acquire+0x1346/0x1fd0 [ 53.458868][ T5065] _raw_spin_lock_irqsave+0xd5/0x120 [ 53.464130][ T5065] ? trie_delete_elem+0x96/0x6a0 [ 53.469041][ T5065] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 53.474906][ T5065] ? __pfx_lock_acquire+0x10/0x10 [ 53.479905][ T5065] trie_delete_elem+0x96/0x6a0 [ 53.484640][ T5065] ? __pfx___cant_migrate+0x10/0x10 [ 53.489816][ T5065] ? do_raw_spin_lock+0x14f/0x370 [ 53.494825][ T5065] bpf_prog_fdee3c9a1e8a2a6e+0x45/0x49 [ 53.500259][ T5065] bpf_trace_run2+0x204/0x420 [ 53.504913][ T5065] ? bpf_trace_run2+0x114/0x420 [ 53.509738][ T5065] ? __pfx_bpf_trace_run2+0x10/0x10 [ 53.514907][ T5065] ? trie_update_elem+0x272/0xc10 [ 53.519905][ T5065] ? _raw_spin_lock_irqsave+0xe1/0x120 [ 53.525337][ T5065] ? __pfx__raw_spin_lock_irqsave+0x10/0x10 [ 53.531205][ T5065] ? trie_update_elem+0x272/0xc10 [ 53.536202][ T5065] kfree+0x291/0x380 [ 53.540077][ T5065] trie_update_elem+0x272/0xc10 [ 53.544905][ T5065] ? __might_fault+0xaa/0x120 [ 53.549557][ T5065] bpf_map_update_value+0x4d3/0x540 [ 53.554734][ T5065] map_update_elem+0x53a/0x6f0 [ 53.559495][ T5065] __sys_bpf+0x76f/0x810 [ 53.563728][ T5065] ? __pfx___sys_bpf+0x10/0x10 [ 53.568470][ T5065] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 53.574769][ T5065] ? do_syscall_64+0x10a/0x240 [ 53.579512][ T5065] __x64_sys_bpf+0x7c/0x90 [ 53.583905][ T5065] do_syscall_64+0xfb/0x240 [ 53.588386][ T5065] entry_SYSCALL_64_after_hwframe+0x6d/0x75 [ 53.594259][ T5065] RIP: 0033:0x7fcbbcb9e829 [ 53.598649][ T5065] Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 [ 53.618228][ T5065] RSP: 002b:00007ffd60628128 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 53.626622][ T5065] RAX: ffffffffffffffda RBX: 00007ffd606282f8 RCX: 00007fcbbcb9e829 [ 53.634569][ T5065] RDX: 0000000000000090 RSI: 0000000020000680 RDI: 0000000000000002 [ 53.642519][ T5065] RBP: 00007fcbbcc11610 R08: 00007ffd606282f8 R09: 00007ffd606282f8 [ 53.650466][ T5065] R10: 00007ffd606282f8 R11: 0000000000000246 R12: 0000000000000001 [ 53.658428][ T5065] R13: 00007ffd606282e8 R14: 0000000000000001 R15: 0000000000000001 [ 53.666379][ T5065]