./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2631316590

<...>
Warning: Permanently added '10.128.0.203' (ED25519) to the list of known hosts.
execve("./syz-executor2631316590", ["./syz-executor2631316590"], 0x7ffdb8370560 /* 10 vars */) = 0
brk(NULL)                               = 0x5555831ff000
brk(0x5555831ffd00)                     = 0x5555831ffd00
arch_prctl(ARCH_SET_FS, 0x5555831ff380) = 0
set_tid_address(0x5555831ff650)         = 5834
set_robust_list(0x5555831ff660, 24)     = 0
rseq(0x5555831ffca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor2631316590", 4096) = 28
getrandom("\x9f\xd0\x18\xcb\x0b\xa2\x5c\xde", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x5555831ffd00
brk(0x555583220d00)                     = 0x555583220d00
brk(0x555583221000)                     = 0x555583221000
mprotect(0x7f0bed0f1000, 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
socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) = 3
socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) = 4
sendto(4, [{nlmsg_len=36, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x03\x00\x00\x00\x0d\x00\x02\x00\x6e\x6c\x38\x30\x32\x31\x35\x34\x00\x00\x00\x00"], 36, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 36
recvfrom(4, [{nlmsg_len=864, nlmsg_type=nlctrl, nlmsg_flags=0, nlmsg_seq=0, nlmsg_pid=5834}, "\x01\x02\x00\x00\x0d\x00\x02\x00\x6e\x6c\x38\x30\x32\x31\x35\x34\x00\x00\x00\x00\x06\x00\x01\x00\x1d\x00\x00\x00\x08\x00\x03\x00\x01\x00\x00\x00\x08\x00\x04\x00\x00\x00\x00\x00\x08\x00\x05\x00\x30\x00\x00\x00\xe8\x02\x06\x00\x14\x00\x01\x00\x08\x00\x01\x00\x01\x00\x00\x00\x08\x00\x02\x00\x0e\x00\x00\x00\x14\x00\x02\x00\x08\x00\x01\x00\x05\x00\x00\x00\x08\x00\x02\x00\x0e\x00\x00\x00\x14\x00\x03\x00"...], 4096, 0, NULL, NULL) = 864
recvfrom(4, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=5834}, {error=0, msg={nlmsg_len=36, nlmsg_type=nlctrl, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 5
ioctl(5, SIOCGIFINDEX, {ifr_name="wpan0", ifr_ifindex=11}) = 0
close(5)                                = 0
sendto(4, [{nlmsg_len=36, nlmsg_type=nl802154, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x0b\x00\x00\x00\x08\x00\x03\x00\x0b\x00\x00\x00\x06\x00\x0a\x00\xa0\xaa\x00\x00"], 36, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 36
recvfrom(4, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=5834}, {error=0, msg={nlmsg_len=36, nlmsg_type=nl802154, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 5
ioctl(5, SIOCGIFINDEX, {ifr_name="wpan0", ifr_ifindex=11}) = 0
close(5)                                = 0
sendto(3, [{nlmsg_len=44, nlmsg_type=0x10 /* NLMSG_??? */, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x00\x00\x00\x00\x0b\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x0c\x00\x01\x00\x02\x00\xaa\xaa\xaa\xaa\xaa\xaa"], 44, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 44
recvfrom(3, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=5834}, {error=0, msg={nlmsg_len=44, nlmsg_type=RTM_NEWLINK, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
sendto(3, [{nlmsg_len=68, nlmsg_type=RTM_NEWLINK, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, nlmsg_seq=0, nlmsg_pid=0}, {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}, [[{nla_len=11, nla_type=IFLA_IFNAME}, "lowpan0"...], [{nla_len=16, nla_type=IFLA_LINKINFO}, [{nla_len=10, nla_type=IFLA_INFO_KIND}, "lowpan"...]], [{nla_len=8, nla_type=IFLA_LINK}, 11]]], 68, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 68
recvfrom(3, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=5834}, {error=0, msg={nlmsg_len=68, nlmsg_type=RTM_NEWLINK, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 5
ioctl(5, SIOCGIFINDEX, {ifr_name="wpan1", ifr_ifindex=12}) = 0
close(5)                                = 0
sendto(4, [{nlmsg_len=36, nlmsg_type=nl802154, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, "\x0b\x00\x00\x00\x08\x00\x03\x00\x0c\x00\x00\x00\x06\x00\x0a\x00\xa1\xaa\x00\x00"], 36, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 36
recvfrom(4, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=5834}, {error=0, msg={nlmsg_len=36, nlmsg_type=nl802154, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 5
ioctl(5, SIOCGIFINDEX, {ifr_name="wpan1", ifr_ifindex=12}) = 0
close(5)                                = 0
sendto(3, [{nlmsg_len=44, nlmsg_type=RTM_NEWLINK, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}, {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=if_nametoindex("wpan1"), ifi_flags=IFF_UP, ifi_change=0x1}, [{nla_len=12, nla_type=IFLA_ADDRESS}, 02:01:aa:aa:aa:aa:aa]], 44, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 12) = 44
recvfrom(3, [{nlmsg_len=36, nlmsg_type=NLMSG_ERROR, nlmsg_flags=NLM_F_CAPPED, nlmsg_seq=0, nlmsg_pid=5834}, {error=0, msg={nlmsg_len=44, nlmsg_type=RTM_NEWLINK, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK, nlmsg_seq=0, nlmsg_pid=0}}], 4096, 0, NULL, NULL) = 36
close(3)                                = 0
close(4)                                = 0
mkdir("./syzkaller.ir2Znr", 0700)       = 0
chmod("./syzkaller.ir2Znr", 0777)       = 0
chdir("./syzkaller.ir2Znr"executing program
)             = 0
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_SYSCALL, insn_cnt=13, insns=0x200000000100, license="GPL", log_level=0, log_size=0, log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=BPF_F_TEST_RND_HI32|BPF_F_SLEEPABLE|0x20, prog_name="", prog_ifindex=0, expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=-1, func_info_rec_size=8, func_info=NULL, func_info_cnt=0, line_info_rec_size=16, line_info=NULL, line_info_cnt=0, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL, ...}, 148) = 4
[   89.024818][ T5834] 
[   89.027359][ T5834] =============================
[   89.032226][ T5834] WARNING: suspicious RCU usage
[   89.037193][ T5834] 6.15.0-rc4-syzkaller-g079e5c56a5c4 #0 Not tainted
[   89.043806][ T5834] -----------------------------
[   89.048751][ T5834] net/core/netclassid_cgroup.c:24 suspicious rcu_dereference_check() usage!
[   89.057531][ T5834] 
[   89.057531][ T5834] other info that might help us debug this:
[   89.057531][ T5834] 
[   89.067861][ T5834] 
bpf(BPF_PROG_TEST_RUN, {test={prog_fd=4, retval=0, data_size_in=0, data_size_out=0, data_in=NULL, data_out=NULL, repeat=0, duration=0, ctx_size_in=0, ctx_size_out=0, ctx_in=NULL, ctx_out=NULL, flags=0, cpu=0}}, 72) = 0
[   89.067861][ T5834] rcu_scheduler_active = 2, debug_locks = 1
[   89.076145][ T5834] 1 lock held by syz-executor263/5834:
[   89.081670][ T5834]  #0: ffffffff8df3ba40 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80
[   89.092085][ T5834] 
[   89.092085][ T5834] stack backtrace:
[   89.098087][ T5834] CPU: 0 UID: 0 PID: 5834 Comm: syz-executor263 Not tainted 6.15.0-rc4-syzkaller-g079e5c56a5c4 #0 PREEMPT(full) 
[   89.098110][ T5834] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
[   89.098125][ T5834] Call Trace:
[   89.098136][ T5834]  <TASK>
[   89.098144][ T5834]  dump_stack_lvl+0x189/0x250
[   89.098183][ T5834]  ? __pfx_dump_stack_lvl+0x10/0x10
[   89.098209][ T5834]  ? __pfx__printk+0x10/0x10
[   89.098242][ T5834]  lockdep_rcu_suspicious+0x140/0x1d0
[   89.098275][ T5834]  task_cls_state+0x1a5/0x1d0
[   89.098304][ T5834]  bpf_get_cgroup_classid_curr+0x18/0x60
[   89.098326][ T5834]  bpf_prog_83da9cb0e78d4768+0x2c/0x5a
[   89.098352][ T5834]  bpf_prog_run_pin_on_cpu+0x67/0x150
[   89.098381][ T5834]  bpf_prog_test_run_syscall+0x312/0x4b0
[   89.098408][ T5834]  ? __pfx_bpf_prog_test_run_syscall+0x10/0x10
[   89.098440][ T5834]  ? __pfx_bpf_prog_test_run_syscall+0x10/0x10
[   89.098466][ T5834]  bpf_prog_test_run+0x2a9/0x340
[   89.098498][ T5834]  __sys_bpf+0x4a4/0x860
[   89.098541][ T5834]  ? __pfx___sys_bpf+0x10/0x10
[   89.098583][ T5834]  ? rcu_is_watching+0x15/0xb0
[   89.098624][ T5834]  __x64_sys_bpf+0x7c/0x90
[   89.098648][ T5834]  do_syscall_64+0xf6/0x210
[   89.098676][ T5834]  ? clear_bhb_loop+0x45/0xa0
[   89.098700][ T5834]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   89.098719][ T5834] RIP: 0033:0x7f0bed0806f9
[   89.098738][ T5834] Code: d8 5b c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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
[   89.098754][ T5834] RSP: 002b:00007ffcaeabee68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
[   89.098774][ T5834] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0bed0806f9
exit_group(0)                           = ?
+++ exited with 0 +++
[   89.098787][ T5834] RDX: 000