./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3575722244 <...> Warning: Permanently added '10.128.0.194' (ED25519) to the list of known hosts. execve("./syz-executor3575722244", ["./syz-executor3575722244"], 0x7fff92b393b0 /* 10 vars */) = 0 brk(NULL) = 0x555594eb8000 brk(0x555594eb8e00) = 0x555594eb8e00 arch_prctl(ARCH_SET_FS, 0x555594eb8480) = 0 set_tid_address(0x555594eb8750) = 5821 set_robust_list(0x555594eb8760, 24) = 0 rseq(0x555594eb8da0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3575722244", 4096) = 28 getrandom("\x56\x9a\xce\xc0\x4f\x72\x6e\x14", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555594eb8e00 brk(0x555594ed9e00) = 0x555594ed9e00 brk(0x555594eda000) = 0x555594eda000 mprotect(0x7f7cd5ecd000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5822 attached [pid 5822] set_robust_list(0x555594eb8760, 24 [pid 5821] <... clone resumed>, child_tidptr=0x555594eb8750) = 5822 [pid 5821] openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC) = 3 [pid 5822] <... set_robust_list resumed>) = 0 [pid 5821] write(3, "10000000000", 11) = 11 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/kernel/hung_task_check_interval_secs", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "20", 2) = 2 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_kallsyms", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "1", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_harden", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "0", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/kernel/kptr_restrict", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "0", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "1", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "100", 3) = 3 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "0", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "0", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "7 4 1 3", 7) = 7 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "1", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "1", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "0", 1) = 1 [pid 5821] close(3) = 0 [pid 5821] openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 [pid 5821] write(3, "5822", 4) = 4 [pid 5821] close(3) = 0 [pid 5821] kill(5822, SIGKILL) = 0 [pid 5822] +++ killed by SIGKILL +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=5822, si_uid=0, si_status=SIGKILL, si_utime=0, si_stime=0} --- 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=0x7f7cd5e28f60, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f7cd5e30140}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f7cd5e28f60, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f7cd5e30140}, 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|0x20, 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 [ 88.141838][ T5821] [ 88.144309][ T5821] ============================= [ 88.149252][ T5821] WARNING: suspicious RCU usage [ 88.154125][ T5821] 6.16.0-rc4-syzkaller-00049-gb4911fb0b060 #0 Not tainted [ 88.161497][ T5821] ----------------------------- [ 88.166402][ T5821] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 88.174985][ T5821] [ 88.174985][ T5821] other info that might help us debug this: [ 88.174985][ T5821] [ 88.185282][ T5821] 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 [ 88.185282][ T5821] rcu_scheduler_active = 2, debug_locks = 1 [ 88.194062][ T5821] 1 lock held by syz-executor357/5821: [ 88.199601][ T5821] #0: ffffffff8e13f000 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 88.209888][ T5821] [ 88.209888][ T5821] stack backtrace: [ 88.215796][ T5821] CPU: 1 UID: 0 PID: 5821 Comm: syz-executor357 Not tainted 6.16.0-rc4-syzkaller-00049-gb4911fb0b060 #0 PREEMPT(full) [ 88.215814][ T5821] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 88.215826][ T5821] Call Trace: [ 88.215835][ T5821] [ 88.215842][ T5821] dump_stack_lvl+0x189/0x250 [ 88.215869][ T5821] ? __pfx_dump_stack_lvl+0x10/0x10 [ 88.215891][ T5821] ? __pfx__printk+0x10/0x10 [ 88.215914][ T5821] lockdep_rcu_suspicious+0x140/0x1d0 [ 88.215944][ T5821] get_callchain_entry+0x2b6/0x3c0 [ 88.215965][ T5821] get_perf_callchain+0xa1/0x6b0 [ 88.215983][ T5821] ? __pfx_get_perf_callchain+0x10/0x10 [ 88.216007][ T5821] __bpf_get_stack+0x3fc/0xa60 [ 88.216034][ T5821] ? __pfx___bpf_get_stack+0x10/0x10 [ 88.216053][ T5821] ? __lock_acquire+0xab9/0xd20 [ 88.216076][ T5821] bpf_get_stack+0x33/0x50 [ 88.216094][ T5821] ? bpf_prog_b8a90dd1efcc4ad9+0x46/0x4e [ 88.216110][ T5821] bpf_get_stack_raw_tp+0x1a9/0x220 [ 88.216129][ T5821] bpf_prog_b8a90dd1efcc4ad9+0x46/0x4e [ 88.216143][ T5821] bpf_prog_run_pin_on_cpu+0x6a/0x150 [ 88.216162][ T5821] bpf_prog_test_run_syscall+0x312/0x4b0 [ 88.216180][ T5821] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 88.216202][ T5821] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 88.216219][ T5821] bpf_prog_test_run+0x2c7/0x340 [ 88.216241][ T5821] __sys_bpf+0x4a4/0x860 [ 88.216260][ T5821] ? __pfx___sys_bpf+0x10/0x10 [ 88.216291][ T5821] ? rcu_is_watching+0x15/0xb0 [ 88.216317][ T5821] __x64_sys_bpf+0x7c/0x90 [ 88.216333][ T5821] do_syscall_64+0xfa/0x3b0 [ 88.216356][ T5821] ? lockdep_hardirqs_on+0x9c/0x150 [ 88.216375][ T5821] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.216389][ T5821] ? clear_bhb_loop+0x60/0xb0 [ 88.216406][ T5821] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 88.216420][ T5821] RIP: 0033:0x7f7cd5e5a059 [ 88.216433][ T5821] 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 [ 88.216448][ T5821] RSP: 002b:00007fff7126f4e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 88.216463][ T5821] RAX: ffffffffffffffda RBX: 00007fff7126f5b0 RCX: 00007f7cd5e5a059 [ 88.216473][ T5821] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a exit_group(0) = ? +++ exited with 0 +++ [ 88.216481][ T5821] RBP: 00007fff7126f5b8 R08: 00007f7cd5ea306