ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1548852368 <...> Warning: Permanently added '10.128.0.75' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1548852368", ["ci2-android-5-10/syz-executor1548852368"], 0x7fff3e3b45b0 /* 10 vars */) = 0 brk(NULL) = 0x555556516000 brk(0x555556516d40) = 0x555556516d40 arch_prctl(ARCH_SET_FS, 0x5555565163c0) = 0 set_tid_address(0x555556516690) = 297 set_robust_list(0x5555565166a0, 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-5-10/syz-executor1548852368", 4096) = 45 getrandom("\x49\xbb\x52\x94\x02\x15\xad\x1c", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555556516d40 brk(0x555556537d40) = 0x555556537d40 brk(0x555556538000) = 0x555556538000 mprotect(0x7fe90677c000, 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 write(1, "executing program\n", 18) = 18 executing program futex(0x7fe906782b4c, FUTEX_WAKE_PRIVATE, 1000000) = 0 rt_sigaction(SIGRT_1, {sa_handler=0x7fe9066e60d0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7fe9066d89e0}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fe906695000 mprotect(0x7fe906696000, 131072, PROT_READ|PROT_WRITE) = 0 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fe9066b5990, parent_tid=0x7fe9066b5990, exit_signal=0, stack=0x7fe906695000, stack_size=0x20300, tls=0x7fe9066b56c0} => {parent_tid=[298]}, 88) = 298 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 futex(0x7fe906782b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 futex(0x7fe906782b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}ci2-android-5-10/strace-static-x86_64: Process 298 attached [pid 298] set_robust_list(0x7fe9066b59a0, 24) = 0 [pid 298] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 298] socket(AF_PPPOX, SOCK_STREAM, 1) = 3 [pid 298] futex(0x7fe906782b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7fe906782b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7fe906782b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] <... futex resumed>) = 1 [pid 298] socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 4 [pid 298] futex(0x7fe906782b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7fe906782b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7fe906782b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] <... futex resumed>) = 1 [ 25.297048][ T24] audit: type=1400 audit(1785702136.950:64): avc: denied { execmem } for pid=297 comm="syz-executor154" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.322790][ T24] audit: type=1400 audit(1785702136.980:65): avc: denied { create } for pid=297 comm="syz-executor154" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [pid 298] connect(3, {sa_family=AF_PPPOX, sa_data="\x01\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x20\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00"}, 50) = 0 [pid 298] futex(0x7fe906782b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 298] <... futex resumed>) = 1 [pid 297] futex(0x7fe906782b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7fe906782b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] sendfile(-1, -1, [3], 2757) = -1 EBADF (Bad file descriptor) [pid 298] futex(0x7fe906782b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 298] <... futex resumed>) = 1 [pid 297] futex(0x7fe906782b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7fe906782b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] clone3({flags=CLONE_UNTRACED|CLONE_CHILD_SETTID|CLONE_NEWCGROUP|CLONE_NEWPID, child_tid=NULL, exit_signal=SIGRT_7, stack=NULL, stack_size=0, cgroup=4294967295}, 88) = 299 [pid 298] futex(0x7fe906782b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 298] <... futex resumed>) = 1 [pid 297] futex(0x7fe906782b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7fe906782b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] ioctl(3, PPPIOCGL2TPSTATS, 0) = -1 EFAULT (Bad address) [pid 298] futex(0x7fe906782b4c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 298] futex(0x7fe906782b48, FUTEX_WAIT_PRIVATE, 0, NULL [pid 297] <... futex resumed>) = 0 [pid 297] exit_group(0) = ? [pid 298] <... futex resumed>) = ? [pid 298] +++ exited with 0 +++ +++ exited with 0 +++ [ 25.345230][ T24] audit: type=1400 audit(1785702136.980:66): avc: denied { connect } for pid=297 comm="syz-executor154" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.372112][ T24] audit: type=1400 audit(1785702137.030:67): avc: denied { ioctl } for pid=297 comm="syz-executor154" path="socket:[1735]" dev="sockfs" ino=1735 ioctlcmd=0x7436 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.521971][ T299] ================================================================== [ 25.530471][ T299] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.538661][ T299] Read of size 4 at addr ffff8881095bb000 by task syz-executor154/299 [ 25.547158][ T299] [ 25.549752][ T299] CPU: 1 PID: 299 Comm: syz-executor154 Not tainted syzkaller #0 [ 25.557827][ T299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.568536][ T299] Call Trace: [ 25.572540][ T299] __dump_stack+0x21/0x24 [ 25.577576][ T299] dump_stack_lvl+0x1a7/0x208 [ 25.582264][ T299] ? show_regs_print_info+0x18/0x18 [ 25.588236][ T299] ? thaw_kernel_threads+0x220/0x220 [ 25.594447][ T299] ? __local_bh_enable_ip+0x53/0x80 [ 25.599786][ T299] print_address_description+0x7f/0x2c0 [ 25.605340][ T299] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.611470][ T299] kasan_report+0x100/0x140 [ 25.617400][ T299] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.623458][ T299] __asan_report_load4_noabort+0x14/0x20 [ 25.629461][ T299] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.635086][ T299] pppol2tp_release+0x150/0x2b0 [ 25.640335][ T299] sock_close+0xb8/0x200 [ 25.644917][ T299] ? sock_mmap+0xa0/0xa0 [ 25.649352][ T299] __fput+0x2dc/0x730 [ 25.653581][ T299] ____fput+0x15/0x20 [ 25.657760][ T299] task_work_run+0x127/0x190 [ 25.662809][ T299] do_exit+0xa7c/0x24e0 [ 25.667310][ T299] ? __kasan_check_write+0x14/0x20 [ 25.672706][ T299] ? switch_fpu_return+0x19c/0x330 [ 25.677997][ T299] ? put_task_struct+0x90/0x90 [ 25.682837][ T299] ? fpu__clear_all+0x20/0x20 [ 25.687560][ T299] ? __kasan_check_read+0x11/0x20 [ 25.693489][ T299] __x64_sys_exit+0x40/0x40 [ 25.698211][ T299] do_syscall_64+0x31/0x40 [ 25.703100][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.709644][ T299] RIP: 0033:0x7fe9066d3859 [ 25.714546][ T299] Code: Unable to access opcode bytes at RIP 0x7fe9066d382f. [ 25.723557][ T299] RSP: 002b:00007fe9066b5118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.732918][ T299] RAX: ffffffffffffffda RBX: 00007fe906782b48 RCX: 00007fe9066d3859 [ 25.741893][ T299] RDX: 00007fe9066b59c8 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.752129][ T299] RBP: 00007fe906782b40 R08: 0000000000000000 R09: 0000000023800000 [ 25.763578][ T299] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe90674e028 [ 25.773745][ T299] R13: 0000200000000040 R14: 0000200000000908 R15: 0000200000000900 [ 25.783743][ T299] [ 25.786143][ T299] Allocated by task 298: [ 25.790757][ T299] __kasan_kmalloc+0xd4/0x100 [ 25.796023][ T299] __kmalloc+0x19f/0x330 [ 25.802002][ T299] l2tp_session_create+0x39/0xb60 [ 25.808658][ T299] pppol2tp_connect+0xbf5/0x1640 [ 25.815033][ T299] __sys_connect+0x3ce/0x450 [ 25.820830][ T299] __x64_sys_connect+0x7a/0x90 [ 25.828748][ T299] do_syscall_64+0x31/0x40 [ 25.833343][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.839664][ T299] [ 25.842314][ T299] Freed by task 7: [ 25.846375][ T299] kasan_set_track+0x4a/0x70 [ 25.851472][ T299] kasan_set_free_info+0x23/0x40 [ 25.856848][ T299] ____kasan_slab_free+0x125/0x160 [ 25.863109][ T299] __kasan_slab_free+0x11/0x20 [ 25.868693][ T299] slab_free_freelist_hook+0xc5/0x190 [ 25.874338][ T299] kfree+0xc0/0x270 [ 25.878598][ T299] l2tp_session_put+0xb2/0x1a0 [ 25.883367][ T299] l2tp_session_delete+0x3a9/0x4a0 [ 25.888904][ T299] l2tp_tunnel_del_work+0x180/0x3d0 [ 25.894762][ T299] process_one_work+0x6fd/0xbc0 [ 25.899953][ T299] worker_thread+0xa8e/0x13c0 [ 25.904802][ T299] kthread+0x324/0x3b0 [ 25.909545][ T299] ret_from_fork+0x1f/0x30 [ 25.915608][ T299] [ 25.918205][ T299] The buggy address belongs to the object at ffff8881095bb000 [ 25.918205][ T299] which belongs to the cache kmalloc-512 of size 512 [ 25.933842][ T299] The buggy address is located 0 bytes inside of [ 25.933842][ T299] 512-byte region [ffff8881095bb000, ffff8881095bb200) [ 25.948617][ T299] The buggy address belongs to the page: [ 25.954512][ T299] page:ffffea0004256e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1095b8 [ 25.966882][ T299] head:ffffea0004256e00 order:2 compound_mapcount:0 compound_pincount:0 [ 25.980607][ T299] flags: 0x4000000000010200(slab|head) [ 25.987444][ T299] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 26.000670][ T299] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.013501][ T299] page dumped because: kasan: bad access detected [ 26.024555][ T299] page_owner tracks the page as allocated [ 26.032399][ T299] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 293, ts 25169051102, free_ts 19709106277 [ 26.058388][ T299] prep_new_page+0x176/0x190 [ 26.065145][ T299] get_page_from_freelist+0x225f/0x23f0 [ 26.075848][ T299] __alloc_pages_nodemask+0x29a/0x640 [ 26.085786][ T299] new_slab+0x84/0x3f0 [ 26.092026][ T299] ___slab_alloc+0x2f8/0x4c0 [ 26.097537][ T299] __slab_alloc+0x63/0xa0 [ 26.103033][ T299] __kmalloc_track_caller+0x1e4/0x310 [ 26.110262][ T299] __alloc_skb+0xdc/0x520 [ 26.115134][ T299] alloc_skb_with_frags+0xa3/0x560 [ 26.120691][ T299] sock_alloc_send_pskb+0x87f/0x9a0 [ 26.128161][ T299] unix_stream_sendmsg+0x4c9/0xbe0 [ 26.135733][ T299] sock_write_iter+0x2a6/0x3a0 [ 26.141800][ T299] vfs_write+0x770/0xd70 [ 26.146657][ T299] ksys_write+0x14a/0x260 [ 26.152287][ T299] __x64_sys_write+0x7b/0x90 [ 26.157628][ T299] do_syscall_64+0x31/0x40 [ 26.163607][ T299] page last free stack trace: [ 26.171975][ T299] free_unref_page_prepare+0x2b7/0x2d0 [ 26.182809][ T299] free_unref_page_list+0x129/0x9c0 [ 26.191796][ T299] release_pages+0xe41/0xe90 [ 26.200180][ T299] free_pages_and_swap_cache+0x86/0xa0 [ 26.210019][ T299] tlb_finish_mmu+0x17e/0x310 [ 26.218217][ T299] exit_mmap+0x329/0x590 [ 26.224579][ T299] __mmput+0x92/0x2d0 [ 26.229946][ T299] mmput+0x4e/0x150 [ 26.235032][ T299] do_exit+0x9d8/0x24e0 [ 26.240701][ T299] do_group_exit+0x149/0x310 [ 26.248148][ T299] __x64_sys_exit_group+0x3f/0x40 [ 26.255950][ T299] do_syscall_64+0x31/0x40 [ 26.262244][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.270340][ T299] [ 26.277161][ T299] Memory state around the buggy address: [ 26.289888][ T299] ffff8881095baf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.306363][ T299] ffff8881095baf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.321069][ T299] >ffff8881095bb000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.334850][ T299] ^ [ 26.343504][ T299] ffff8881095bb080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.359035][ T299] ffff8881095bb100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.371324][ T299] ================================================================== [ 26.384304][ T299] Disabling lock debugging due to kernel taint [ 26.394149][ T299] ------------[ cut here ]------------ [ 26.402431][ T299] WARNING: CPU: 1 PID: 299 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 26.417281][ T299] Modules linked in: [ 26.418590][ T24] audit: type=1400 audit(1785702138.070:68): avc: denied { read } for pid=77 comm="syslogd" name="log" dev="sda1" ino=2010 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:var_t tclass=lnk_file permissive=1 [ 26.422041][ T299] CPU: 0 PID: 299 Comm: syz-executor154 Tainted: G B syzkaller #0 [ 26.453466][ T24] audit: type=1400 audit(1785702138.070:69): avc: denied { search } for pid=77 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 26.466069][ T299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 26.495528][ T24] audit: type=1400 audit(1785702138.070:70): avc: denied { write } for pid=77 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 26.510671][ T299] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 26.545452][ T24] audit: type=1400 audit(1785702138.070:71): avc: denied { add_name } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 26.555188][ T299] Code: 5d c3 e8 dc df 35 fd be 02 00 00 00 eb 0a e8 d0 df 35 fd be 01 00 00 00 4c 89 f7 e8 43 55 0f fe e9 0f ff ff ff e8 b9 df 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 a8 df 35 fd 4c 89 f7 be 03 [ 26.585571][ T24] audit: type=1400 audit(1785702138.070:72): avc: denied { create } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 26.610695][ T299] RSP: 0018:ffffc90000ba7c40 EFLAGS: 00010293 [ 26.636685][ T24] audit: type=1400 audit(1785702138.070:73): avc: denied { append open } for pid=77 comm="syslogd" path="/tmp/messages" dev="tmpfs" ino=5 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 26.636689][ T299] [ 26.636709][ T299] RAX: ffffffff842ec3a7 RBX: ffff88810af6b000 RCX: ffff88810af94f00 [ 26.683170][ T299] RDX: 0000000000000000 RSI: 000000000b102000 RDI: 000000000c04eb7d [ 26.692548][ T299] RBP: ffffc90000ba7c60 R08: 0000000000000003 R09: 0000000000000004 [ 26.701508][ T299] R10: dffffc0000000000 R11: fffffbfff0dcf648 R12: dffffc0000000000 [ 26.711455][ T299] R13: dffffc0000000000 R14: 000000000b102000 R15: ffff8881095bb000 [ 26.720955][ T299] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 26.733422][ T299] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.741294][ T299] CR2: 000000000062b5d8 CR3: 000000010d713000 CR4: 00000000003506b0 [ 26.750910][ T299] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.759570][ T299] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.767965][ T299] Call Trace: [ 26.771729][ T299] pppol2tp_release+0x150/0x2b0 [ 26.776741][ T299] sock_close+0xb8/0x200 [ 26.781010][ T299] ? sock_mmap+0xa0/0xa0 [ 26.785436][ T299] __fput+0x2dc/0x730 [ 26.789697][ T299] ____fput+0x15/0x20 [ 26.793791][ T299] task_work_run+0x127/0x190 [ 26.800636][ T299] do_exit+0xa7c/0x24e0 [ 26.806301][ T299] ? __kasan_check_write+0x14/0x20 [ 26.813353][ T299] ? switch_fpu_return+0x19c/0x330 [ 26.821154][ T299] ? put_task_struct+0x90/0x90 [ 26.827221][ T299] ? fpu__clear_all+0x20/0x20 [ 26.832355][ T299] ? __kasan_check_read+0x11/0x20 [ 26.838424][ T299] __x64_sys_exit+0x40/0x40 [ 26.843462][ T299] do_syscall_64+0x31/0x40 [ 26.848662][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.855764][ T299] RIP: 0033:0x7fe9066d3859 [ 26.860811][ T299] Code: Unable to access opcode bytes at RIP 0x7fe9066d382f. [ 26.868926][ T299] RSP: 002b:00007fe9066b5118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.877979][ T299] RAX: ffffffffffff