./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor788123479 <...> Warning: Permanently added '10.128.1.149' (ED25519) to the list of known hosts. execve("./syz-executor788123479", ["./syz-executor788123479"], 0x7ffc582d5160 /* 10 vars */) = 0 brk(NULL) = 0x55555d9c5000 brk(0x55555d9c5d00) = 0x55555d9c5d00 arch_prctl(ARCH_SET_FS, 0x55555d9c5380) = 0 set_tid_address(0x55555d9c5650) = 5893 set_robust_list(0x55555d9c5660, 24) = 0 rseq(0x55555d9c5ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor788123479", 4096) = 27 getrandom("\x63\x9a\x80\xaf\xd2\x59\x11\xd8", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555d9c5d00 brk(0x55555d9e6d00) = 0x55555d9e6d00 brk(0x55555d9e7000) = 0x55555d9e7000 mprotect(0x7fb47bef2000, 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, child_tidptr=0x55555d9c5650) = 5894 ./strace-static-x86_64: Process 5894 attached [pid 5893] openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC) = 3 [pid 5894] set_robust_list(0x55555d9c5660, 24 [pid 5893] write(3, "10000000000", 11 [pid 5894] <... set_robust_list resumed>) = 0 [pid 5893] <... write resumed>) = 11 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/kernel/hung_task_check_interval_secs", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "20", 2) = 2 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_kallsyms", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "1", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_harden", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "0", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/kernel/kptr_restrict", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "0", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "1", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "100", 3) = 3 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "0", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "0", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "7 4 1 3", 7) = 7 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "1", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "1", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "0", 1) = 1 [pid 5893] close(3) = 0 [pid 5893] openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 [pid 5893] write(3, "5894", 4) = 4 [pid 5893] close(3) = 0 [pid 5893] kill(5894, SIGKILL) = 0 [pid 5894] +++ killed by SIGKILL +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=5894, si_uid=0, si_status=SIGKILL, si_utime=0, si_stime=0} --- mkdir("/syzcgroup", 0777) = 0 mkdir("/syzcgroup/unified", 0777) = 0 mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL) = 0 chmod("/syzcgroup/unified", 0777) = 0 openat(AT_FDCWD, "/syzcgroup/unified/cgroup.subtree_control", O_WRONLY) = 3 write(3, "+cpu", 4) = 4 write(3, "+io", 3) = 3 write(3, "+pids", 5) = 5 close(3) = 0 mkdir("/syzcgroup/net", 0777) = 0 mount("none", "/syzcgroup/net", "cgroup", 0, "net") = -1 EINVAL (Invalid argument) mount("none", "/syzcgroup/net", "cgroup", 0, "net_prio") = 0 umount2("/syzcgroup/net", 0) = 0 mount("none", "/syzcgroup/net", "cgroup", 0, "devices") = 0 umount2("/syzcgroup/net", 0) = 0 mount("none", "/syzcgroup/net", "cgroup", 0, "blkio") = 0 umount2("/syzcgroup/net", 0) = 0 mount("none", "/syzcgroup/net", "cgroup", 0, "freezer") = 0 umount2("/syzcgroup/net", 0) = 0 [ 212.451242][ T5893] cgroup: Unknown subsys name 'net' mount("none", "/syzcgroup/net", "cgroup", 0, "net_prio,devices,blkio,freezer") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/net", "cgroup", 0, "net_prio,devices,blkio,freezer") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/net", "cgroup", 0, "net_prio,devices,blkio,freezer") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/net", "cgroup", 0, "net_prio,devices,blkio,freezer") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/net", "cgroup", 0, "net_prio,devices,blkio,freezer") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/net", "cgroup", 0, "net_prio,devices,blkio,freezer") = 0 chmod("/syzcgroup/net", 0777) = 0 mkdir("/syzcgroup/cpu", 0777) = 0 mount("none", "/syzcgroup/cpu", "cgroup", 0, "cpuset") = -1 EINVAL (Invalid argument) mount("none", "/syzcgroup/cpu", "cgroup", 0, "cpuacct") = 0 umount2("/syzcgroup/cpu", 0) = 0 mount("none", "/syzcgroup/cpu", "cgroup", 0, "hugetlb") = 0 umount2("/syzcgroup/cpu", 0) = 0 mount("none", "/syzcgroup/cpu", "cgroup", 0, "rlimit") = -1 EINVAL (Invalid argument) mount("none", "/syzcgroup/cpu", "cgroup", 0, "memory") = 0 umount2("/syzcgroup/cpu", 0) = 0 mount("none", "/syzcgroup/cpu", "cgroup", 0, "cpuacct,hugetlb,memory") = ? ERESTARTNOINTR (To be restarted) [ 212.634657][ T5893] cgroup: Unknown subsys name 'cpuset' [ 212.669945][ T5893] cgroup: Unknown subsys name 'rlimit' mount("none", "/syzcgroup/cpu", "cgroup", 0, "cpuacct,hugetlb,memory") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/cpu", "cgroup", 0, "cpuacct,hugetlb,memory") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/cpu", "cgroup", 0, "cpuacct,hugetlb,memory") = ? ERESTARTNOINTR (To be restarted) mount("none", "/syzcgroup/cpu", "cgroup", 0, "cpuacct,hugetlb,memory") = 0 chmod("/syzcgroup/cpu", 0777) = 0 openat(AT_FDCWD, "/syzcgroup/cpu/cgroup.clone_children", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/syzcgroup/cpu/cpuset.memory_pressure_enabled", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) chmod("/dev/raw-gadget", 0666) = 0 mkdir("./syzkaller.8xOhAt", 0700) = 0 chmod("./syzkaller.8xOhAt", 0777) = 0 chdir("./syzkaller.8xOhAt") = 0 unshare(CLONE_NEWPID) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5895 attached , child_tidptr=0x55555d9c5650) = 5895 [pid 5895] set_robust_list(0x55555d9c5660, 24) = 0 [pid 5895] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5895] getppid() = 0 [pid 5895] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5895] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5895] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5895] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5895] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5895] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5895] unshare(CLONE_NEWNS) = 0 [pid 5895] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5895] unshare(CLONE_NEWIPC) = 0 [pid 5895] unshare(CLONE_NEWCGROUP) = 0 [pid 5895] unshare(CLONE_NEWUTS) = 0 [pid 5895] unshare(CLONE_SYSVSEM) = 0 [pid 5895] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5895] write(3, "16777216", 8) = 8 [pid 5895] close(3) = 0 [pid 5895] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5895] write(3, "536870912", 9) = 9 [pid 5895] close(3) = 0 [pid 5895] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5895] write(3, "1024", 4) = 4 [pid 5895] close(3) = 0 [pid 5895] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5895] write(3, "8192", 4) = 4 [pid 5895] close(3) = 0 [pid 5895] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5895] write(3, "1024", 4) = 4 [pid 5895] close(3) = 0 [pid 5895] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5895] write(3, "1024", 4) = 4 [pid 5895] close(3) = 0 [pid 5895] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5895] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5895] close(3) = 0 [pid 5895] getpid() = 1 [pid 5895] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<) = 0 [pid 5895] umount2("./0", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] openat(AT_FDCWD, "./0", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5895] newfstatat(3, "", {st_mode=S_IFDIR|0700, st_size=120, ...}, AT_EMPTY_PATH) = 0 [pid 5895] getdents64(3, 0x55555d9c66f0 /* 6 entries */, 32768) = 176 [pid 5895] umount2("./0/binderfs", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./0/binderfs", {st_mode=S_IFLNK|0777, st_size=13, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./0/binderfs") = 0 [pid 5895] umount2("./0/cgroup.net", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./0/cgroup.net", {st_mode=S_IFLNK|0777, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./0/cgroup.net") = 0 [pid 5895] umount2("./0/cgroup.cpu", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./0/cgroup.cpu", {st_mode=S_IFLNK|0777, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./0/cgroup.cpu") = 0 [pid 5895] umount2("./0/cgroup", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./0/cgroup", {st_mode=S_IFLNK|0777, st_size=23, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./0/cgroup") = 0 [pid 5895] getdents64(3, 0x55555d9c66f0 /* 0 entries */, 32768) = 0 [pid 5895] close(3) = 0 [pid 5895] rmdir("./0") = 0 [pid 5895] mkdir("./1", 0777) = 0 [pid 5895] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5912 attached [pid 5912] set_robust_list(0x55555d9c5660, 24 [pid 5895] <... clone resumed>, child_tidptr=0x55555d9c5650) = 3 [pid 5912] <... set_robust_list resumed>) = 0 [pid 5912] chdir("./1") = 0 [pid 5912] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5912] setpgid(0, 0) = 0 [pid 5912] symlink("/syzcgroup/unified/syz0", "./cgroup") = 0 [pid 5912] symlink("/syzcgroup/cpu/syz0", "./cgroup.cpu") = 0 [pid 5912] symlink("/syzcgroup/net/syz0", "./cgroup.net") = 0 [pid 5912] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5912] write(3, "1000", 4) = 4 [pid 5912] close(3) = 0 [pid 5912] read(200, 0x7ffcd44538a0, 1000) = -1 EAGAIN (Resource temporarily unavailable) [pid 5912] symlink("/dev/binderfs", "./binderfs") = 0 executing program [pid 5912] write(1, "executing program\n", 18) = 18 [pid 5912] socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER) = 3 [pid 5912] sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x14\x00\x00\x00\x10\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0a\x20\x00\x00\x00\x00\x0a\x01\x03\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\xff\xfd\x09\x00\x01\x00\x73\x79\x7a\x30\x00\x00\x00\x00\x40\x00\x00\x00\x03\x0a\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x09\x00\x03\x00\x73\x79\x7a\x32\x00\x00\x00\x00\x14\x00\x04\x80\x08\x00\x02\x40\x32\x65\x8a\xeb\x08\x00\x01\x40"..., iov_len=204}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 204 [pid 5912] write(200, "\xaa\xaa\xaa\xaa\xaa\xaa\xff\xff\xff\xff\xff\xff\x08\x00\x45\xec\x00\x28\x00\x00\x00\x00\x00\x06\xb9\xe5\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x4e\x29\x44\x43\x42\x41\x44\x43\x42\x41\x50\x16\x00\x01\x54\x7c\x00\x20", 54) = 54 [pid 5912] close(3) = 0 [pid 5912] close(4) = -1 EBADF (Bad file descriptor) [pid 5912] close(5) = -1 EBADF (Bad file descriptor) [pid 5912] close(6) = -1 EBADF (Bad file descriptor) [pid 5912] close(7) = -1 EBADF (Bad file descriptor) [pid 5912] close(8) = -1 EBADF (Bad file descriptor) [pid 5912] close(9) = -1 EBADF (Bad file descriptor) [pid 5912] close(10) = -1 EBADF (Bad file descriptor) [pid 5912] close(11) = -1 EBADF (Bad file descriptor) [pid 5912] close(12) = -1 EBADF (Bad file descriptor) [pid 5912] close(13) = -1 EBADF (Bad file descriptor) [pid 5912] close(14) = -1 EBADF (Bad file descriptor) [pid 5912] close(15) = -1 EBADF (Bad file descriptor) [pid 5912] close(16) = -1 EBADF (Bad file descriptor) [pid 5912] close(17) = -1 EBADF (Bad file descriptor) [pid 5912] close(18) = -1 EBADF (Bad file descriptor) [pid 5912] close(19) = -1 EBADF (Bad file descriptor) [pid 5912] close(20) = -1 EBADF (Bad file descriptor) [pid 5912] close(21) = -1 EBADF (Bad file descriptor) [pid 5912] close(22) = -1 EBADF (Bad file descriptor) [pid 5912] close(23) = -1 EBADF (Bad file descriptor) [pid 5912] close(24) = -1 EBADF (Bad file descriptor) [pid 5912] close(25) = -1 EBADF (Bad file descriptor) [pid 5912] close(26) = -1 EBADF (Bad file descriptor) [pid 5912] close(27) = -1 EBADF (Bad file descriptor) [pid 5912] close(28) = -1 EBADF (Bad file descriptor) [pid 5912] close(29) = -1 EBADF (Bad file descriptor) [pid 5912] exit_group(0) = ? [pid 5912] +++ exited with 0 +++ [pid 5895] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3, si_uid=0, si_status=0, si_utime=0, si_stime=1 /* 0.01 s */} --- [pid 5895] umount2("./1", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] openat(AT_FDCWD, "./1", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [ 232.236898][ C1] sched: DL replenish lagged too much [pid 5895] newfstatat(3, "", {st_mode=S_IFDIR|0700, st_size=120, ...}, AT_EMPTY_PATH) = 0 [pid 5895] getdents64(3, 0x55555d9c66f0 /* 6 entries */, 32768) = 176 [pid 5895] umount2("./1/binderfs", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./1/binderfs", {st_mode=S_IFLNK|0777, st_size=13, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./1/binderfs") = 0 [pid 5895] umount2("./1/cgroup.net", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./1/cgroup.net", {st_mode=S_IFLNK|0777, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./1/cgroup.net") = 0 [pid 5895] umount2("./1/cgroup.cpu", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./1/cgroup.cpu", {st_mode=S_IFLNK|0777, st_size=19, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./1/cgroup.cpu") = 0 [pid 5895] umount2("./1/cgroup", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] newfstatat(AT_FDCWD, "./1/cgroup", {st_mode=S_IFLNK|0777, st_size=23, ...}, AT_SYMLINK_NOFOLLOW) = 0 [pid 5895] unlink("./1/cgroup") = 0 [pid 5895] getdents64(3, 0x55555d9c66f0 /* 0 entries */, 32768) = 0 [pid 5895] close(3) = 0 [pid 5895] rmdir("./1") = 0 [pid 5895] mkdir("./2", 0777) = 0 [pid 5895] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5913 attached , child_tidptr=0x55555d9c5650) = 4 [pid 5913] set_robust_list(0x55555d9c5660, 24) = 0 [pid 5913] chdir("./2") = 0 [pid 5913] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5913] setpgid(0, 0) = 0 [pid 5913] symlink("/syzcgroup/unified/syz0", "./cgroup") = 0 [pid 5913] symlink("/syzcgroup/cpu/syz0", "./cgroup.cpu" [pid 5895] kill(-4, SIGKILL) = 0 [pid 5895] kill(4, SIGKILL) = 0 [pid 5913] <... symlink resumed>) = ? [pid 5913] +++ killed by SIGKILL +++ [pid 5895] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=4, si_uid=0, si_status=SIGKILL, si_utime=0, si_stime=9 /* 0.09 s */} --- [pid 5895] umount2("./2", MNT_FORCE|UMOUNT_NOFOLLOW) = -1 EINVAL (Invalid argument) [pid 5895] openat(AT_FDCWD, "./2", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [ 443.540124][ T31] INFO: task kworker/1:2:1210 blocked for more than 143 seconds. [ 443.590364][ T31] Not tainted 6.17.0-rc1-syzkaller-00215-gbab3ce404553 #0 [ 453.130931][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.