./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor208246018

<...>
Warning: Permanently added '10.128.0.224' (ED25519) to the list of known hosts.
execve("./syz-executor208246018", ["./syz-executor208246018"], 0x7fff43cf3ac0 /* 10 vars */) = 0
brk(NULL)                               = 0x55558517f000
brk(0x55558517fd00)                     = 0x55558517fd00
arch_prctl(ARCH_SET_FS, 0x55558517f380) = 0
set_tid_address(0x55558517f650)         = 5835
set_robust_list(0x55558517f660, 24)     = 0
rseq(0x55558517fca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor208246018", 4096) = 27
getrandom("\x25\x98\x82\xda\x3a\xc5\x69\xd7", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55558517fd00
brk(0x5555851a0d00)                     = 0x5555851a0d00
brk(0x5555851a1000)                     = 0x5555851a1000
mprotect(0x7fdc231fa000, 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
chmod("/dev/raw-gadget", 0666)          = 0
unshare(CLONE_NEWPID)                   = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5836 attached
, child_tidptr=0x55558517f650) = 5836
[pid  5836] set_robust_list(0x55558517f660, 24) = 0
[pid  5836] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  5836] getppid()                   = 0
[pid  5836] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0
[pid  5836] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0
[pid  5836] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0
[pid  5836] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0
[pid  5836] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0
[pid  5836] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0
[pid  5836] unshare(CLONE_NEWNS)        = 0
[pid  5836] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0
[pid  5836] unshare(CLONE_NEWIPC)       = 0
[pid  5836] unshare(CLONE_NEWCGROUP)    = 0
[pid  5836] unshare(CLONE_NEWUTS)       = 0
[pid  5836] unshare(CLONE_SYSVSEM)      = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "16777216", 8)     = 8
[pid  5836] close(3)                    = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "536870912", 9)    = 9
[pid  5836] close(3)                    = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "1024", 4)         = 4
[pid  5836] close(3)                    = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "8192", 4)         = 4
[pid  5836] close(3)                    = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "1024", 4)         = 4
[pid  5836] close(3)                    = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "1024", 4)         = 4
[pid  5836] close(3)                    = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "1024 1048576 500 1024", 21) = 21
[pid  5836] close(3)                    = 0
[pid  5836] getpid()                    = 1
[pid  5836] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, permitted=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, inheritable=0}) = 0
[pid  5836] capset({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, permitted=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ|1<<CAP_PERFMON|1<<CAP_BPF|1<<CAP_CHECKPOINT_RESTORE, inheritable=0}) = 0
[pid  5836] unshare(CLONE_NEWNET)       = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/net/ipv4/ping_group_range", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "0 65535", 7)      = 7
[pid  5836] close(3)                    = 0
[pid  5836] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3
[pid  5836] write(3, "100000", 6)       = 6
[pid  5836] close(3)                    = 0
[pid  5836] mkdir("./syz-tmp", 0777)    = 0
[pid  5836] mount("", "./syz-tmp", "tmpfs", 0, NULL) = 0
[pid  5836] mkdir("./syz-tmp/newroot", 0777) = 0
[pid  5836] mkdir("./syz-tmp/newroot/dev", 0700) = 0
[pid  5836] mount("/dev", "./syz-tmp/newroot/dev", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5836] mkdir("./syz-tmp/newroot/proc", 0700) = 0
[pid  5836] mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL) = 0
[pid  5836] mkdir("./syz-tmp/newroot/selinux", 0700) = 0
[pid  5836] mount("/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5836] mount("/sys/fs/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5836] mkdir("./syz-tmp/newroot/sys", 0700) = 0
[pid  5836] mount("/sys", "./syz-tmp/newroot/sys", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5836] mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5836] mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5836] mount("/proc/sys/fs/binfmt_misc", "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid  5836] mkdir("./syz-tmp/newroot/syz-inputs", 0700) = 0
[pid  5836] mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL, MS_RDONLY|MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid  5836] mkdir("./syz-tmp/pivot", 0777) = 0
[pid  5836] pivot_root("./syz-tmp", "./syz-tmp/pivot") = 0
[pid  5836] chdir("/")                  = 0
[pid  5836] umount2("./pivot", MNT_DETACH) = 0
[pid  5836] chroot("./newroot")         = 0
[pid  5836] chdir("/")                  = 0
[pid  5836] mkdir("/dev/gadgetfs", 0777) = 0
[pid  5836] mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL) = 0
[pid  5836] mkdir("/dev/binderfs", 0777) = 0
[pid  5836] mount("binder", "/dev/binderfs", "binder", 0, NULL) = 0
[pid  5836] symlink("/dev/binderfs", "./binderfs") = 0
[pid  5836] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy)
[pid  5836] write(1, "executing program\n", 18executing program
) = 18
[pid  5836] 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
[pid  5836] 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
[   76.897352][ T5836] 
[   76.899889][ T5836] =============================
[   76.904795][ T5836] WARNING: suspicious RCU usage
[   76.909648][ T5836] 6.15.0-syzkaller-g02670deede22 #0 Not tainted
[   76.916254][ T5836] -----------------------------
[   76.921086][ T5836] net/core/netclassid_cgroup.c:24 suspicious rcu_dereference_check() usage!
[   76.930024][ T5836] 
[   76.930024][ T5836] other info that might help us debug this:
[   76.930024][ T5836] 
[   76.940296][ T5836] 
[pid  5836] 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
[pid  5836] exit_group(1)               = ?
[   76.940296][ T5836] rcu_scheduler_active = 2, debug_locks = 1
[   76.948386][ T5836] 1 lock held by syz-executor208/5836:
[   76.953902][ T5836]  #0: ffffffff8e13f240 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80
[   76.964201][ T5836] 
[   76.964201][ T5836] stack backtrace:
[   76.970094][ T5836] CPU: 0 UID: 0 PID: 5836 Comm: syz-executor208 Not tainted 6.15.0-syzkaller-g02670deede22 #0 PREEMPT(full) 
[   76.970106][ T5836] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
[   76.970116][ T5836] Call Trace:
[   76.970122][ T5836]  <TASK>
[   76.970127][ T5836]  dump_stack_lvl+0x189/0x250
[   76.970150][ T5836]  ? __pfx_dump_stack_lvl+0x10/0x10
[   76.970164][ T5836]  ? __pfx__printk+0x10/0x10
[   76.970181][ T5836]  lockdep_rcu_suspicious+0x140/0x1d0
[   76.970197][ T5836]  task_cls_state+0x1a5/0x1d0
[   76.970211][ T5836]  bpf_get_cgroup_classid_curr+0x18/0x60
[   76.970223][ T5836]  bpf_prog_83da9cb0e78d4768+0x2c/0x5e
[   76.970236][ T5836]  bpf_prog_run_pin_on_cpu+0x67/0x150
[   76.970251][ T5836]  bpf_prog_test_run_syscall+0x312/0x4b0
[   76.970264][ T5836]  ? __pfx_bpf_prog_test_run_syscall+0x10/0x10
[   76.970279][ T5836]  ? __pfx_bpf_prog_test_run_syscall+0x10/0x10
[   76.970291][ T5836]  bpf_prog_test_run+0x2c7/0x340
[   76.970310][ T5836]  __sys_bpf+0x4a4/0x860
[   76.970322][ T5836]  ? __pfx___sys_bpf+0x10/0x10
[   76.970343][ T5836]  ? rcu_is_watching+0x15/0xb0
[   76.970356][ T5836]  __x64_sys_bpf+0x7c/0x90
[   76.970368][ T5836]  do_syscall_64+0xfa/0x3b0
[   76.970381][ T5836]  ? lockdep_hardirqs_on+0x9c/0x150
[   76.970395][ T5836]  ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   76.970404][ T5836]  ? clear_bhb_loop+0x60/0xb0
[   76.970415][ T5836]  entry_SYSCALL_64_after_hwframe+0x77/0x7f
[   76.970424][ T5836] RIP: 0033:0x7fdc2318e619
[   76.970434][ T5836] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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
[   76.970442][ T5836] RSP: 002b:00007ffd015ab768 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
[pid  5836] +++ exited with 1 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5836, si_uid=0, si_status=1, si_utime=0, si_stime=18 /* 0.18 s */} ---
exit_group(0)                           = ?
+++ exited with 0 +++
[   76.970452][ T5836] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdc231