ci2-android-6-1/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-6-1/syz-executor3638942209

<...>

syzkaller
syzkaller login: [   15.249102][   T28] kauditd_printk_skb: 31 callbacks suppressed
[   15.249117][   T28] audit: type=1400 audit(1785807227.779:59): avc:  denied  { transition } for  pid=224 comm="sshd-session" path="/bin/sh" dev="sda1" ino=90 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   15.253780][   T28] audit: type=1400 audit(1785807227.779:60): avc:  denied  { noatsecure } for  pid=224 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   15.257660][   T28] audit: type=1400 audit(1785807227.789:61): avc:  denied  { write } for  pid=224 comm="sh" path="pipe:[12859]" dev="pipefs" ino=12859 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1
[   15.261132][   T28] audit: type=1400 audit(1785807227.789:62): avc:  denied  { rlimitinh } for  pid=224 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   15.264182][   T28] audit: type=1400 audit(1785807227.789:63): avc:  denied  { siginh } for  pid=224 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   17.218963][  T232] scp (232) used greatest stack depth: 21024 bytes left
Warning: Permanently added '10.128.0.16' (ED25519) to the list of known hosts.
execve("ci2-android-6-1/syz-executor3638942209", ["ci2-android-6-1/syz-executor3638942209"], 0x7ffddc5369e0 /* 10 vars */) = 0
brk(NULL)                               = 0x55556a4e4000
brk(0x55556a4e4d40)                     = 0x55556a4e4d40
arch_prctl(ARCH_SET_FS, 0x55556a4e43c0) = 0
set_tid_address(0x55556a4e4690)         = 304
set_robust_list(0x55556a4e46a0, 24)     = 0
rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 32, 0, 0x53053053) = -1 ENOSYS (Function not implemented)
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlinkat(AT_FDCWD, "/proc/self/exe", "/root/ci2-android-6-1/syz-executor3638942209", 4096) = 44
getrandom("\xd6\x73\x16\x3e\xce\x2c\x1a\xd0", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0x55556a4e4d40
brk(0x55556a505d40)                     = 0x55556a505d40
brk(0x55556a506000)                     = 0x55556a506000
mprotect(0x7f7eea0a8000, 20480, 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
unshare(CLONE_NEWPID)                   = 0
rt_sigprocmask(SIG_BLOCK, ~[], [], 8)   = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55556a4e4690) = 305
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
ci2-android-6-1/strace-static-x86_64: Process 305 attached
[pid   305] set_robust_list(0x55556a4e46a0, 24) = 0
[pid   305] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid   305] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid   305] getppid()                   = 0
[pid   305] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0
[pid   305] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0
[pid   305] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0
[pid   305] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0
[pid   305] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0
[pid   305] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0
[pid   305] unshare(CLONE_NEWNS)        = 0
[pid   305] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0
[pid   305] unshare(CLONE_NEWIPC)       = -1 EINVAL (Invalid argument)
[pid   305] unshare(CLONE_NEWCGROUP)    = 0
[pid   305] unshare(CLONE_NEWUTS)       = 0
[pid   305] unshare(CLONE_SYSVSEM)      = 0
[pid   305] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid   305] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid   305] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid   305] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid   305] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid   305] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid   305] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid   305] getpid()                    = 1
[pid   305] 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   305] 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   305] unshare(CLONE_NEWNET)       = 0
[pid   305] openat(AT_FDCWD, "/proc/sys/net/ipv4/ping_group_range", O_WRONLY|O_CLOEXEC) = 3
[pid   305] write(3, "0 65535", 7)      = 7
[pid   305] close(3)                    = 0
[pid   305] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3
[pid   305] write(3, "100000", 6)       = 6
[pid   305] close(3)                    = 0
[pid   305] mkdir("./syz-tmp", 0777)    = 0
[   25.253382][   T28] audit: type=1400 audit(1785807237.779:64): avc:  denied  { execmem } for  pid=304 comm="syz-executor363" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[   25.273412][   T28] audit: type=1400 audit(1785807237.789:65): avc:  denied  { mounton } for  pid=305 comm="syz-executor363" path="/" dev="sda1" ino=2 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:root_t tclass=dir permissive=1
[pid   305] mount("", "./syz-tmp", "tmpfs", 0, NULL) = 0
[pid   305] mkdir("./syz-tmp/newroot", 0777) = 0
[pid   305] mkdir("./syz-tmp/newroot/dev", 0700) = 0
[pid   305] mount("/dev", "./syz-tmp/newroot/dev", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid   305] mkdir("./syz-tmp/newroot/proc", 0700) = 0
[pid   305] mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL) = 0
[pid   305] mkdir("./syz-tmp/newroot/selinux", 0700) = 0
[pid   305] mount("/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = -1 ENOENT (No such file or directory)
[pid   305] mount("/sys/fs/selinux", "./syz-tmp/newroot/selinux", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid   305] mkdir("./syz-tmp/newroot/sys", 0700) = 0
[pid   305] mount("/sys", "./syz-tmp/newroot/sys", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid   305] mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid   305] 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   305] mount("/proc/sys/fs/binfmt_misc", "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, MS_BIND|MS_REC|MS_PRIVATE, NULL) = 0
[pid   305] mkdir("./syz-tmp/newroot/syz-inputs", 0700) = 0
[pid   305] 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   305] mkdir("./syz-tmp/pivot", 0777) = 0
[pid   305] pivot_root("./syz-tmp", "./syz-tmp/pivot") = 0
[pid   305] chdir("/")                  = 0
[pid   305] umount2("./pivot", MNT_DETACH) = 0
[pid   305] chroot("./newroot")         = 0
[pid   305] chdir("/")                  = 0
[pid   305] mkdir("/dev/gadgetfs", 0777) = 0
[pid   305] mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL) = -1 ENODEV (No such device)
[   25.300419][   T28] audit: type=1400 audit(1785807237.829:66): avc:  denied  { mounton } for  pid=305 comm="syz-executor363" path="/root/syz-tmp" dev="sda1" ino=2025 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1
[   25.323873][   T28] audit: type=1400 audit(1785807237.829:67): avc:  denied  { mount } for  pid=305 comm="syz-executor363" name="/" dev="tmpfs" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:tmpfs_t tclass=filesystem permissive=1
[   25.329443][  T305] request_module fs-gadgetfs succeeded, but still no fs?
[pid   305] mkdir("/dev/binderfs", 0777) = 0
[pid   305] mount("binder", "/dev/binderfs", "binder", 0, NULL) = 0
[pid   305] symlink("/dev/binderfs", "./binderfs") = 0
[pid   305] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy)
executing program
[pid   305] write(1, "executing program\n", 18) = 18
[pid   305] socket(AF_PPPOX, SOCK_STREAM, 1) = 3
[pid   305] socket(AF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
[pid   305] connect(3, {sa_family=AF_PPPOX, sa_data="\x01\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x02\x20\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00"}, 50) = 0
[pid   305] ioctl(3, BTRFS_IOC_RM_DEV_V2, 0) = -1 ENOTTY (Inappropriate ioctl for device)
[   25.347297][   T28] audit: type=1400 audit(1785807237.829:68): avc:  denied  { mounton } for  pid=305 comm="syz-executor363" path="/root/syz-tmp/newroot/dev" dev="tmpfs" ino=3 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_tmpfs_t tclass=dir permissive=1
[   25.377764][   T28] audit: type=1400 audit(1785807237.829:69): avc:  denied  { mount } for  pid=305 comm="syz-executor363" name="/" dev="proc" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:proc_t tclass=filesystem permissive=1
[   25.399891][  T305] ==================================================================
[   25.400914][   T28] audit: type=1400 audit(1785807237.839:70): avc:  denied  { mounton } for  pid=305 comm="syz-executor363" path="/root/syz-tmp/newroot/sys/kernel/debug" dev="debugfs" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:debugfs_t tclass=dir permissive=1
[   25.407979][  T305] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0
[   25.408044][  T305] Write of size 8 at addr ffff8881103cfd50 by task syz-executor363/305
[   25.434142][   T28] audit: type=1400 audit(1785807237.839:71): avc:  denied  { mounton } for  pid=305 comm="syz-executor363" path="/root/syz-tmp/newroot/proc/sys/fs/binfmt_misc" dev="proc" ino=15081 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:sysctl_fs_t tclass=dir permissive=1
[   25.439997][  T305] 
[   25.440017][  T305] CPU: 1 PID: 305 Comm: syz-executor363 Not tainted syzkaller #0
[   25.440040][  T305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[   25.449135][   T28] audit: type=1400 audit(1785807237.839:72): avc:  denied  { unmount } for  pid=305 comm="syz-executor363" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fs_t tclass=filesystem permissive=1
[   25.474342][  T305] Call Trace:
[   25.474351][  T305]  <TASK>
[   25.474360][  T305]  __dump_stack+0x21/0x24
[   25.474392][  T305]  dump_stack_lvl+0x110/0x170
[   25.477751][   T28] audit: type=1400 audit(1785807237.859:73): avc:  denied  { mounton } for  pid=305 comm="syz-executor363" path="/dev/gadgetfs" dev="devtmpfs" ino=570 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:device_t tclass=dir permissive=1
[   25.484454][  T305]  ? __cfi_dump_stack_lvl+0x8/0x8
[   25.557208][  T305]  ? mutex_lock+0x86/0x1b0
[   25.561651][  T305]  print_address_description+0x71/0x200
[   25.567219][  T305]  print_report+0x4a/0x60
[   25.571565][  T305]  kasan_report+0x122/0x150
[   25.576070][  T305]  ? mutex_lock+0x86/0x1b0
[   25.580493][  T305]  kasan_check_range+0x249/0x2a0
[   25.585433][  T305]  __kasan_check_write+0x14/0x20
[   25.590380][  T305]  mutex_lock+0x86/0x1b0
[   25.594640][  T305]  ? __cfi_mutex_lock+0x10/0x10
[   25.599524][  T305]  ? kfree+0x6f/0xf0
[   25.603466][  T305]  ? l2tp_session_put+0xaf/0x1a0
[   25.608426][  T305]  ? l2tp_session_delete+0x3df/0x4d0
[   25.613771][  T305]  pppol2tp_release+0x178/0x2b0
[   25.618659][  T305]  sock_close+0xc9/0x220
[   25.622928][  T305]  ? __cfi_sock_close+0x10/0x10
[   25.627806][  T305]  __fput+0x1fd/0x8f0
[   25.631804][  T305]  ____fput+0x15/0x20
[   25.635794][  T305]  task_work_run+0x1e1/0x250
[   25.640405][  T305]  ? __cfi_task_work_run+0x10/0x10
[   25.645561][  T305]  ptrace_notify+0x23f/0x270
[   25.650186][  T305]  ? __cfi_task_work_add+0x10/0x10
[   25.655312][  T305]  ? __cfi_ptrace_notify+0x10/0x10
[   25.660445][  T305]  ? fput+0x15b/0x1a0
[   25.664450][  T305]  ? filp_close+0x111/0x160
[   25.669005][  T305]  syscall_exit_work+0x84/0x140
[   25.673902][  T305]  syscall_exit_to_user_mode_prepare+0x1c/0x20
[   25.680090][  T305]  syscall_exit_to_user_mode+0xd/0x30
[   25.685512][  T305]  do_syscall_64+0x58/0xa0
[   25.689971][  T305]  ? clear_bhb_loop+0x30/0x80
[   25.694660][  T305]  ? clear_bhb_loop+0x30/0x80
[   25.699351][  T305]  entry_SYSCALL_64_after_hwframe+0x68/0xd2
[   25.705271][  T305] RIP: 0033:0x7f7eea027557
[   25.709715][  T305] Code: 48 89 fa 4c 89 df e8 48 1f 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[   25.729329][  T305] RSP: 002b:00007fffc698bea0 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
[   25.737847][  T305] RAX: 0000000000000000 RBX: 000055556a4e43c0 RCX: 00007f7eea027557
[   25.745832][  T305] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
[   25.753833][  T305] RBP: 00007f7eea07d126 R08: 0000000000000000 R09: 0000000000000000
[   25.761813][  T305] R10: 0000000000000000 R11: 0000000000000202 R12: 00007f7eea07edf0
[   25.769797][  T305] R13: 00007f7eea07d08e R14: 00007f7eea0a8bc0 R15: 0000000000000002
[   25.777788][  T305]  </TASK>
[   25.780812][  T305] 
[   25.783140][  T305] Allocated by task 305:
[   25.787382][  T305]  kasan_set_track+0x4b/0x70
[   25.791985][  T305]  kasan_save_alloc_info+0x1f/0x30
[   25.797123][  T305]  __kasan_kmalloc+0x95/0xb0
[   25.801726][  T305]  __kmalloc+0xb4/0x1e0
[   25.805924][  T305]  l2tp_session_create+0x38/0xbd0
[   25.810956][  T305]  pppol2tp_connect+0xbf5/0x1640
[   25.815908][  T305]  __sys_connect+0x3da/0x460
[   25.820520][  T305]  __x64_sys_connect+0x7a/0x90
[   25.825320][  T305]  x64_sys_call+0x88d/0x9a0
[   25.829834][  T305]  do_syscall_64+0x4c/0xa0
[   25.834264][  T305]  entry_SYSCALL_64_after_hwframe+0x68/0xd2
[   25.840176][  T305] 
[   25.842505][  T305] Freed by task 305:
[   25.846398][  T305]  kasan_set_track+0x4b/0x70
[   25.850995][  T305]  kasan_save_free_info+0x2b/0x40
[   25.856023][  T305]  ____kasan_slab_free+0x132/0x180
[   25.861142][  T305]  __kasan_slab_free+0x11/0x20
[   25.865938][  T305]  slab_free_freelist_hook+0xc2/0x190
[   25.871320][  T305]  __kmem_cache_free+0xb7/0x1b0
[   25.876181][  T305]  kfree+0x6f/0xf0
[   25.879911][  T305]  l2tp_session_put+0xaf/0x1a0
[   25.884681][  T305]  l2tp_session_delete+0x3df/0x4d0
[   25.889806][  T305]  pppol2tp_release+0x169/0x2b0
[   25.894669][  T305]  sock_close+0xc9/0x220
[   25.898958][  T305]  __fput+0x1fd/0x8f0
[   25.902955][  T305]  ____fput+0x15/0x20
[   25.906944][  T305]  task_work_run+0x1e1/0x250
[   25.911561][  T305]  ptrace_notify+0x23f/0x270
[   25.916165][  T305]  syscall_exit_work+0x84/0x140
[   25.921028][  T305]  syscall_exit_to_user_mode_prepare+0x1c/0x20
[   25.927209][  T305]  syscall_exit_to_user_mode+0xd/0x30
[   25.932593][  T305]  do_syscall_64+0x58/0xa0
[   25.937023][  T305]  entry_SYSCALL_64_after_hwframe+0x68/0xd2
[   25.942930][  T305] 
[   25.945258][  T305] The buggy address belongs to the object at ffff8881103cfc00
[   25.945258][  T305]  which belongs to the cache kmalloc-512 of size 512
[   25.959457][  T305] The buggy address is located 336 bytes inside of
[   25.959457][  T305]  512-byte region [ffff8881103cfc00, ffff8881103cfe00)
[   25.972742][  T305] 
[   25.975081][  T305] The buggy address belongs to the physical page:
[   25.981600][  T305] page:ffffea000440f300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1103cc
[   25.991847][  T305] head:ffffea000440f300 order:2 compound_mapcount:0 compound_pincount:0
[   26.000177][  T305] flags: 0x4000000000010200(slab|head|zone=1)
[   26.006263][  T305] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00
[   26.014854][  T305] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[   26.023476][  T305] page dumped because: kasan: bad access detected
[   26.029885][  T305] page_owner tracks the page as allocated
[   26.035614][  T305] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 305, tgid 305 (syz-executor363), ts 25297967301, free_ts 25176391959
[   26.057093][  T305]  post_alloc_hook+0x1f5/0x210
[   26.061878][  T305]  prep_new_page+0x1c/0x110
[   26.066395][  T305]  get_page_from_freelist+0x2ca9/0x2d20
[   26.072733][  T305]  __alloc_pages+0x1fa/0x610
[   26.077332][  T305]  alloc_slab_page+0x6e/0xf0
[   26.082015][  T305]  new_slab+0x98/0x3e0
[   26.086097][  T305]  ___slab_alloc+0x70f/0xb70
[   26.090784][  T305]  __slab_alloc+0x5e/0xa0
[   26.095125][  T305]  __kmem_cache_alloc_node+0x204/0x2d0
[   26.100590][  T305]  __kmalloc+0xa4/0x1e0
[   26.104741][  T305]  alloc_workqueue+0x15b/0x13b0
[   26.109595][  T305]  tipc_topsrv_init_net+0x35f/0x840
[   26.114822][  T305]  ops_init+0x2ce/0x470
[   26.119000][  T305]  setup_net+0x4b4/0xcd0
[   26.123247][  T305]  copy_net_ns+0x355/0x5c0
[   26.127689][  T305]  create_new_namespaces+0x3a8/0x660
[   26.133076][  T305] page last free stack trace:
[   26.137753][  T305]  free_unref_page_prepare+0x80c/0x820
[   26.143221][  T305]  free_unref_page+0x93/0x530
[   26.147929][  T305]  __free_pages+0x67/0x100
[   26.152363][  T305]  __free_slab+0xc7/0x1a0
[   26.156697][  T305]  __unfreeze_partials+0x15a/0x190
[   26.161813][  T305]  put_cpu_partial+0xa9/0x100
[   26.166507][  T305]  __slab_free+0x1c4/0x280
[   26.170937][  T305]  ___cache_free+0xbf/0xd0
[   26.175456][  T305]  qlist_free_all+0xc6/0x140
[   26.180064][  T305]  kasan_quarantine_reduce+0x14a/0x170
[   26.185539][  T305]  __kasan_slab_alloc+0x24/0x80
[   26.190403][  T305]  slab_post_alloc_hook+0x4f/0x2d0
[   26.195522][  T305]  kmem_cache_alloc_node+0x179/0x330
[   26.200812][  T305]  __alloc_skb+0xe8/0x4a0
[   26.205144][  T305]  tcp_stream_alloc_skb+0x47/0x360
[   26.210265][  T305]  tcp_sendmsg_locked+0xcb7/0x39f0
[   26.215385][  T305] 
[   26.217717][  T305] Memory state around the buggy address:
[   26.223358][  T305]  ffff8881103cfc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   26.231425][  T305]  ffff8881103cfc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   26.239491][  T305] >ffff8881103cfd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   26.247551][  T305]                                                  ^
[pid   305] close(3)                    = 0
[pid   305] close(4)                    = 0
[pid   305] close(5)                    = -1 EBADF (Bad file descriptor)
[pid   305] close(6)                    = -1 EBADF (Bad file descriptor)
[pid   305] close(7)                    = -1 EBADF (Bad file descriptor)
[pid   305] close(8)                    = -1 EBADF (Bad file descriptor)
[pid   305] close(9)                    = -1 EBADF (Bad file descriptor)
[pid   305] close(10)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(11)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(12)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(13)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(14)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(15)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(16)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(17)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(18)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(19)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(20)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(21)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(22)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(23)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(24)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(25)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(26)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(27)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(28)                   = -1 EBADF (Bad file descriptor)
[pid   305] close(29)                   = -1 EBADF (Bad file descriptor)
[pid   305] exit_group(1)               = ?
[pid   305] +++ exited with 1 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=305, si_uid=0, si_status=1, si_utime=0, si_stime=9 /* 0.09 s */} ---
exit_group(0)                           = ?
+++ exited with 0 +++
[   26.254227][  T305]  ffff8881103cfd80: fb