./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor177060222 <...> Warning: Permanently added '10.128.1.23' (ED25519) to the list of known hosts. execve("./syz-executor177060222", ["./syz-executor177060222"], 0x7ffda080ff40 /* 10 vars */) = 0 brk(NULL) = 0x555556f28000 brk(0x555556f28d00) = 0x555556f28d00 arch_prctl(ARCH_SET_FS, 0x555556f28380) = 0 set_tid_address(0x555556f28650) = 5846 set_robust_list(0x555556f28660, 24) = 0 rseq(0x555556f28ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor177060222", 4096) = 27 getrandom("\xc3\x2f\xdc\x5c\xe9\xa3\xf8\x2e", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555556f28d00 brk(0x555556f49d00) = 0x555556f49d00 brk(0x555556f4a000) = 0x555556f4a000 mprotect(0x7f3005888000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5847 attached [pid 5847] set_robust_list(0x555556f28660, 24 [pid 5846] <... clone resumed>, child_tidptr=0x555556f28650) = 5847 [pid 5847] <... set_robust_list resumed>) = 0 [pid 5847] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5847] setpgid(0, 0) = 0 [pid 5847] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5847] write(3, "1000", 4) = 4 [pid 5847] close(3) = 0 [pid 5847] write(1, "executing program\n", 18executing program ) = 18 [pid 5847] 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=4294966948, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EFAULT (Bad address) [pid 5847] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5847] close(3) = 0 [pid 5847] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=65537, max_entries=8, map_flags=BPF_F_NO_PREALLOC, 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 5847] 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) [pid 5847] close(3) = 0 [pid 5847] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=3983, max_entries=9, map_flags=BPF_F_NO_PREALLOC, 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 5847] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5847] 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) = 5 [pid 5847] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [pid 5847] exit_group(0) = ? [pid 5847] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5847, si_uid=0, si_status=0, si_utime=0, si_stime=0} --- restart_syscall(<... resuming interrupted clone ...>) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5848 attached , child_tidptr=0x555556f28650) = 5848 [pid 5848] set_robust_list(0x555556f28660, 24) = 0 [pid 5848] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5848] setpgid(0, 0) = 0 [pid 5848] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "1000", 4) = 4 [pid 5848] close(3) = 0 executing program [pid 5848] write(1, "executing program\n", 18) = 18 [pid 5848] 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=4294966948, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EFAULT (Bad address) [pid 5848] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5848] close(3) = 0 [pid 5848] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=65537, max_entries=8, map_flags=BPF_F_NO_PREALLOC, 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 5848] 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) [pid 5848] close(3) = 0 [pid 5848] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=3983, max_entries=9, map_flags=BPF_F_NO_PREALLOC, 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 5848] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5848] 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) = 5 [pid 5848] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [pid 5848] exit_group(0) = ? [pid 5848] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5848, si_uid=0, si_status=0, si_utime=0, si_stime=0} --- restart_syscall(<... resuming interrupted clone ...>) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5849 attached , child_tidptr=0x555556f28650) = 5849 [pid 5849] set_robust_list(0x555556f28660, 24) = 0 [pid 5849] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5849] setpgid(0, 0) = 0 [pid 5849] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5849] write(3, "1000", 4) = 4 [pid 5849] close(3) = 0 [pid 5849] write(1, "executing program\n", 18executing program ) = 18 [pid 5849] 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=4294966948, attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EFAULT (Bad address) [pid 5849] socketpair(AF_TIPC, SOCK_DGRAM, 0, [3, 4]) = 0 [pid 5849] close(3) = 0 [pid 5849] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=65537, max_entries=8, map_flags=BPF_F_NO_PREALLOC, 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 5849] 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) [pid 5849] close(3) = 0 [pid 5849] bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_LPM_TRIE, key_size=7, value_size=3983, max_entries=9, map_flags=BPF_F_NO_PREALLOC, 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 5849] bpf(BPF_MAP_UPDATE_ELEM, {map_fd=3, key=0x20000340, value=0x20000200, flags=BPF_ANY}, 32) = 0 [pid 5849] 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) = 5 [pid 5849] bpf(BPF_RAW_TRACEPOINT_OPEN, {raw_tracepoint={name="timer_start", prog_fd=5}}, 16) = 6 [ 55.472244][ T17] [ 55.474582][ T17] ====================================================== [ 55.481584][ T17] WARNING: possible circular locking dependency detected [ 55.488593][ T17] 6.12.0-rc6-syzkaller-01236-gcf6d9fe09185 #0 Not tainted [ 55.495684][ T17] ------------------------------------------------------ [ 55.502692][ T17] rcu_preempt/17 is trying to acquire lock: [ 55.508571][ T17] ffff8880b8729430 (krc.lock){....}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 [ 55.517205][ T17] [ 55.517205][ T17] but task is already holding lock: [ 55.524551][ T17] ffff8880b872a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 55.533418][ T17] [ 55.533418][ T17] which lock already depends on the new lock. [ 55.533418][ T17] [ 55.543805][ T17] [ 55.543805][ T17] the existing dependency chain (in reverse order) is: [ 55.552802][ T17] [ 55.552802][ T17] -> #1 (&base->lock){-.-.}-{2:2}: [ 55.560092][ T17] lock_acquire+0x1ed/0x550 [ 55.565112][ T17] _raw_spin_lock_irqsave+0xd5/0x120 [ 55.570919][ T17] lock_timer_base+0x112/0x240 [ 55.576194][ T17] __mod_timer+0x1ca/0xeb0 [ 55.581119][ T17] queue_delayed_work_on+0x1ca/0x390 [ 55.586916][ T17] kvfree_call_rcu+0x47f/0x790 [ 55.592188][ T17] pwq_release_workfn+0x664/0x800 [ 55.597722][ T17] kthread_worker_fn+0x500/0xb70 [ 55.603200][ T17] kthread+0x2f0/0x390 [ 55.607773][ T17] ret_from_fork+0x4b/0x80 [ 55.612699][ T17] ret_from_fork_asm+0x1a/0x30 [ 55.617976][ T17] [ 55.617976][ T17] -> #0 (krc.lock){....}-{2:2}: [ 55.625004][ T17] validate_chain+0x18ef/0x5920 [ 55.630361][ T17] __lock_acquire+0x1384/0x2050 [ 55.635724][ T17] lock_acquire+0x1ed/0x550 [ 55.640746][ T17] _raw_spin_lock+0x2e/0x40 [ 55.645759][ T17] kvfree_call_rcu+0x18a/0x790 [ 55.651032][ T17] trie_delete_elem+0x546/0x6a0 [ 55.656393][ T17] bpf_prog_2c29ac5cdc6b1842+0x43/0x47 [ 55.662364][ T17] bpf_trace_run2+0x2ec/0x540 [ 55.667547][ T17] enqueue_timer+0x3ce/0x570 [ 55.672650][ T17] __mod_timer+0xa0e/0xeb0 [ 55.677574][ T17] schedule_timeout+0x1b9/0x310 [ 55.682936][ T17] rcu_gp_fqs_loop+0x2df/0x1330 [ 55.688292][ T17] rcu_gp_kthread+0xa7/0x3b0 [ 55.693387][ T17] kthread+0x2f0/0x390 [ 55.697962][ T17] ret_from_fork+0x4b/0x80 [ 55.702890][ T17] ret_from_fork_asm+0x1a/0x30 [ 55.708161][ T17] [ 55.708161][ T17] other info that might help us debug this: [ 55.708161][ T17] [ 55.718370][ T17] Possible unsafe locking scenario: [ 55.718370][ T17] [ 55.725800][ T17] CPU0 CPU1 [ 55.731147][ T17] ---- ---- [ 55.736494][ T17] lock(&base->lock); [ 55.740552][ T17] lock(krc.lock); [ 55.746864][ T17] lock(&base->lock); [ 55.753437][ T17] lock(krc.lock); [ 55.757232][ T17] [ 55.757232][ T17] *** DEADLOCK *** [ 55.757232][ T17] [ 55.765359][ T17] 2 locks held by rcu_preempt/17: [ 55.770363][ T17] #0: ffff8880b872a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 [ 55.779678][ T17] #1: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 [ 55.789070][ T17] [ 55.789070][ T17] stack backtrace: [ 55.794953][ T17] CPU: 1 UID: 0 PID: 17 Comm: rcu_preempt Not tainted 6.12.0-rc6-syzkaller-01236-gcf6d9fe09185 #0 [ 55.805523][ T17] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 [ 55.815572][ T17] Call Trace: [ 55.818841][ T17] [ 55.821758][ T17] dump_stack_lvl+0x241/0x360 [ 55.826423][ T17] ? __pfx_dump_stack_lvl+0x10/0x10 [ 55.831607][ T17] ? __pfx__printk+0x10/0x10 [ 55.836190][ T17] print_circular_bug+0x13a/0x1b0 [ 55.841202][ T17] check_noncircular+0x36a/0x4a0 [ 55.846130][ T17] ? __pfx_check_noncircular+0x10/0x10 [ 55.851577][ T17] ? lockdep_lock+0x123/0x2b0 [ 55.856243][ T17] ? mark_lock+0x9a/0x360 [ 55.860559][ T17] validate_chain+0x18ef/0x5920 [ 55.865404][ T17] ? __pfx_validate_chain+0x10/0x10 [ 55.870586][ T17] ? stack_depot_save_flags+0x6e4/0x830 [ 55.876121][ T17] ? do_raw_spin_lock+0x14f/0x370 [ 55.881134][ T17] ? __pfx_lock_release+0x10/0x10 [ 55.886154][ T17] ? do_raw_spin_unlock+0x13c/0x8b0 [ 55.891343][ T17] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 55.897226][ T17] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 55.903542][ T17] ? stack_trace_save+0x118/0x1d0 [ 55.908558][ T17] ? mark_lock+0x9a/0x360 [ 55.912875][ T17] __lock_acquire+0x1384/0x2050 [ 55.917724][ T17] lock_acquire+0x1ed/0x550 [ 55.922216][ T17] ? kvfree_call_rcu+0x18a/0x790 [ 55.927143][ T17] ? __pfx_lock_acquire+0x10/0x10 [ 55.932161][ T17] ? __phys_addr+0xba/0x170 [ 55.936652][ T17] _raw_spin_lock+0x2e/0x40 [ 55.941143][ T17] ? kvfree_call_rcu+0x18a/0x790 [ 55.946064][ T17] kvfree_call_rcu+0x18a/0x790 [ 55.950815][ T17] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 55.956699][ T17] ? __pfx_kvfree_call_rcu+0x10/0x10 [ 55.961978][ T17] ? longest_prefix_match+0x49f/0x650 [ 55.967342][ T17] trie_delete_elem+0x546/0x6a0 [ 55.972185][ T17] ? bpf_trace_run2+0x1fc/0x540 [ 55.977024][ T17] bpf_prog_2c29ac5cdc6b1842+0x43/0x47 [ 55.982469][ T17] bpf_trace_run2+0x2ec/0x540 [ 55.987135][ T17] ? __pfx_bpf_trace_run2+0x10/0x10 [ 55.992321][ T17] ? __pfx_debug_object_activate+0x10/0x10 [ 55.998112][ T17] ? lockdep_hardirqs_on+0x99/0x150 [ 56.003302][ T17] enqueue_timer+0x3ce/0x570 [ 56.007884][ T17] __mod_timer+0xa0e/0xeb0 [ 56.012289][ T17] ? __asan_memset+0x23/0x50 [ 56.016872][ T17] ? __pfx___mod_timer+0x10/0x10 [ 56.021795][ T17] ? __pfx_lockdep_init_map_type+0x10/0x10 [ 56.027592][ T17] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 56.033910][ T17] schedule_timeout+0x1b9/0x310 [ 56.038751][ T17] ? __pfx_schedule_timeout+0x10/0x10 [ 56.044110][ T17] ? __pfx_process_timeout+0x10/0x10 [ 56.049385][ T17] ? prepare_to_swait_event+0x330/0x350 [ 56.054922][ T17] rcu_gp_fqs_loop+0x2df/0x1330 [ 56.059761][ T17] ? lockdep_hardirqs_on+0x99/0x150 [ 56.064950][ T17] ? rcu_gp_init+0x1256/0x1630 [ 56.069705][ T17] ? __pfx_rcu_gp_init+0x10/0x10 [ 56.074628][ T17] ? __pfx_rcu_gp_fqs_loop+0x10/0x10 [ 56.079898][ T17] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 56.085783][ T17] ? finish_swait+0xd4/0x1e0 [ 56.090364][ T17] rcu_gp_kthread+0xa7/0x3b0 [ 56.094942][ T17] ? __pfx_rcu_gp_kthread+0x10/0x10 [ 56.100134][ T17] ? _raw_spin_unlock_irqrestore+0xdd/0x140 [ 56.106017][ T17] ? __kthread_parkme+0x169/0x1d0 [ 56.111031][ T17] ? __pfx_rcu_gp_kthread+0x10/0x10 [ 56.116214][ T17] kthread+0x2f0/0x390 [ 56.120267][ T17] ? __pfx_rcu_gp_kthread+0x10/0x10 [ 56.125451][ T17] ? __pfx_kthread+0x10/0x10 [ 56.130024][ T17] ret_from_fork+0x4b/0x80 [ 56.134429][ T17] ? __pfx_kthread+0x10/0x10 [ 56.139006][ T17] ret_from_fork_asm+0x1a/0x30 [ 56.143764][ T17]