./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor275277356 <...> Warning: Permanently added '10.128.1.171' (ED25519) to the list of known hosts. execve("./syz-executor275277356", ["./syz-executor275277356"], 0x7ffca6cadca0 /* 10 vars */) = 0 brk(NULL) = 0x55555db58000 brk(0x55555db58e00) = 0x55555db58e00 arch_prctl(ARCH_SET_FS, 0x55555db58480) = 0 set_tid_address(0x55555db58750) = 5848 set_robust_list(0x55555db58760, 24) = 0 rseq(0x55555db58da0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor275277356", 4096) = 27 getrandom("\x07\xa9\x7e\x59\x1b\xc0\x3c\xda", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555db58e00 brk(0x55555db79e00) = 0x55555db79e00 brk(0x55555db7a000) = 0x55555db7a000 mprotect(0x7fe0880df000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 rt_sigaction(SIGRTMIN, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGSEGV, {sa_handler=0x7fe08803cb60, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7fe088043d20}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7fe08803cb60, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7fe088043d20}, NULL, 8) = 0 executing program write(1, "executing program\n", 18) = 18 bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_RINGBUF, key_size=0, value_size=0, max_entries=32768, map_flags=0, inner_map_fd=-1, 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=0x200000000440, 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_PROG_LOAD, {prog_type=BPF_PROG_TYPE_SYSCALL, insn_cnt=12, insns=0x200000000440, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=BPF_F_ANY_ALIGNMENT|BPF_F_TEST_STATE_FREQ|BPF_F_SLEEPABLE, 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 [ 79.120371][ T5848] [ 79.123027][ T5848] ============================= [ 79.128079][ T5848] WARNING: suspicious RCU usage [ 79.133244][ T5848] 6.16.0-rc5-syzkaller-00187-gb640daa2822a #0 Not tainted [ 79.140501][ T5848] ----------------------------- [ 79.145364][ T5848] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 79.153923][ T5848] [ 79.153923][ T5848] other info that might help us debug this: [ 79.153923][ T5848] [ 79.164377][ T5848] bpf(BPF_PROG_TEST_RUN, {test={prog_fd=4, retval=4294967295, data_size_in=0, data_size_out=0, data_in=NULL, data_out=NULL, repeat=0, duration=0}}, 12) = 0 exit_group(0) = ? [ 79.164377][ T5848] rcu_scheduler_active = 2, debug_locks = 1 [ 79.172673][ T5848] 1 lock held by syz-executor275/5848: [ 79.178215][ T5848] #0: ffffffff8e13f340 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 79.188632][ T5848] [ 79.188632][ T5848] stack backtrace: [ 79.194551][ T5848] CPU: 1 UID: 0 PID: 5848 Comm: syz-executor275 Not tainted 6.16.0-rc5-syzkaller-00187-gb640daa2822a #0 PREEMPT(full) [ 79.194565][ T5848] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 79.194576][ T5848] Call Trace: [ 79.194582][ T5848] [ 79.194587][ T5848] dump_stack_lvl+0x189/0x250 [ 79.194606][ T5848] ? __pfx_dump_stack_lvl+0x10/0x10 [ 79.194618][ T5848] ? __pfx__printk+0x10/0x10 [ 79.194638][ T5848] lockdep_rcu_suspicious+0x140/0x1d0 [ 79.194653][ T5848] get_callchain_entry+0x2b6/0x3c0 [ 79.194671][ T5848] get_perf_callchain+0xa1/0x6b0 [ 79.194686][ T5848] ? __pfx_get_perf_callchain+0x10/0x10 [ 79.194705][ T5848] __bpf_get_stack+0x3fc/0xa60 [ 79.194722][ T5848] ? __pfx___bpf_get_stack+0x10/0x10 [ 79.194732][ T5848] ? __lock_acquire+0xab9/0xd20 [ 79.194745][ T5848] bpf_get_stack+0x33/0x50 [ 79.194754][ T5848] ? bpf_prog_b8a90dd1efcc4ad9+0x46/0x4e [ 79.194767][ T5848] bpf_get_stack_raw_tp+0x1a9/0x220 [ 79.194783][ T5848] bpf_prog_b8a90dd1efcc4ad9+0x46/0x4e [ 79.194792][ T5848] bpf_prog_run_pin_on_cpu+0x67/0x150 [ 79.194807][ T5848] bpf_prog_test_run_syscall+0x312/0x4b0 [ 79.194822][ T5848] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 79.194838][ T5848] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 79.194850][ T5848] bpf_prog_test_run+0x2c4/0x340 [ 79.194862][ T5848] __sys_bpf+0x4a4/0x860 [ 79.194872][ T5848] ? __pfx___sys_bpf+0x10/0x10 [ 79.194891][ T5848] ? rcu_is_watching+0x15/0xb0 [ 79.194906][ T5848] __x64_sys_bpf+0x7c/0x90 [ 79.194920][ T5848] do_syscall_64+0xfa/0x3b0 [ 79.194933][ T5848] ? lockdep_hardirqs_on+0x9c/0x150 [ 79.194948][ T5848] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 79.194957][ T5848] ? clear_bhb_loop+0x60/0xb0 [ 79.194969][ T5848] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 79.194978][ T5848] RIP: 0033:0x7fe08806cbe9 [ 79.194989][ T5848] 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 [ 79.195001][ T5848] RSP: 002b:00007ffe2e0c1968 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 79.195012][ T5848] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe08806cbe9 [ 79.195018][ T5848] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a +++ exited with 0 +++ [ 79.195024][ T5848] RBP: 00000000000000