ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor3029686126 <...> rocess permissive=1 [ 14.312359][ T24] audit: type=1400 audit(1787525632.030:63): avc: denied { siginh } for pid=216 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.125' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor3029686126", ["ci2-android-5-10/syz-executor3029686126"], 0x7ffe8a21bc60 /* 10 vars */) = 0 brk(NULL) = 0x55557a777000 brk(0x55557a777d40) = 0x55557a777d40 arch_prctl(ARCH_SET_FS, 0x55557a7773c0) = 0 set_tid_address(0x55557a777690) = 297 set_robust_list(0x55557a7776a0, 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-executor3029686126", 4096) = 45 getrandom("\x78\x8c\x78\x55\x18\x11\xe8\xd2", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557a777d40 brk(0x55557a798d40) = 0x55557a798d40 brk(0x55557a799000) = 0x55557a799000 mprotect(0x7f39b90cd000, 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 executing program write(1, "executing program\n", 18) = 18 futex(0x7f39b90d3b4c, FUTEX_WAKE_PRIVATE, 1000000) = 0 rt_sigaction(SIGRT_1, {sa_handler=0x7f39b90370d0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f39b90299e0}, 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) = 0x7f39b8fe6000 mprotect(0x7f39b8fe7000, 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=0x7f39b9006990, parent_tid=0x7f39b9006990, exit_signal=0, stack=0x7f39b8fe6000, stack_size=0x20300, tls=0x7f39b90066c0} => {parent_tid=[298]}, 88) = 298 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 futex(0x7f39b90d3b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 futex(0x7f39b90d3b4c, 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(0x7f39b90069a0, 24) = 0 [pid 298] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 298] socket(AF_PPPOX, SOCK_STREAM, 1) = 3 [pid 298] futex(0x7f39b90d3b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7f39b90d3b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f39b90d3b4c, 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(0x7f39b90d3b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7f39b90d3b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f39b90d3b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] <... futex resumed>) = 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(0x7f39b90d3b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7f39b90d3b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f39b90d3b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] <... futex resumed>) = 1 [pid 298] sendfile(-1, -1, [3], 2757) = -1 EBADF (Bad file descriptor) [pid 298] futex(0x7f39b90d3b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7f39b90d3b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f39b90d3b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] <... futex resumed>) = 1 [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(0x7f39b90d3b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7f39b90d3b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f39b90d3b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] <... futex resumed>) = 1 [pid 298] ioctl(3, PPPIOCGFLAGS, 0) = -1 ENOSYS (Function not implemented) [ 23.906966][ T24] audit: type=1400 audit(1787525641.680:64): avc: denied { execmem } for pid=297 comm="syz-executor302" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 23.926832][ T24] audit: type=1400 audit(1787525641.690:65): avc: denied { create } for pid=297 comm="syz-executor302" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [pid 298] futex(0x7f39b90d3b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] exit_group(0) = ? [pid 298] <... futex resumed>) = ? [pid 298] +++ exited with 0 +++ +++ exited with 0 +++ [ 23.947308][ T24] audit: type=1400 audit(1787525641.700:66): avc: denied { connect } for pid=297 comm="syz-executor302" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.967274][ T24] audit: type=1400 audit(1787525641.730:67): avc: denied { ioctl } for pid=297 comm="syz-executor302" path="socket:[13977]" dev="sockfs" ino=13977 ioctlcmd=0x745a scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.116447][ T299] ================================================================== [ 24.124589][ T299] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.132746][ T299] Read of size 4 at addr ffff888122065000 by task syz-executor302/299 [ 24.140894][ T299] [ 24.143361][ T299] CPU: 0 PID: 299 Comm: syz-executor302 Not tainted syzkaller #0 [ 24.151072][ T299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.161306][ T299] Call Trace: [ 24.164637][ T299] __dump_stack+0x21/0x24 [ 24.168969][ T299] dump_stack_lvl+0x1a7/0x208 [ 24.173640][ T299] ? show_regs_print_info+0x18/0x18 [ 24.178835][ T299] ? thaw_kernel_threads+0x220/0x220 [ 24.184110][ T299] ? __local_bh_enable_ip+0x53/0x80 [ 24.189299][ T299] print_address_description+0x7f/0x2c0 [ 24.194839][ T299] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.200548][ T299] kasan_report+0x100/0x140 [ 24.205039][ T299] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.210748][ T299] __asan_report_load4_noabort+0x14/0x20 [ 24.216412][ T299] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.222568][ T299] pppol2tp_release+0x150/0x2b0 [ 24.227419][ T299] sock_close+0xb8/0x200 [ 24.231658][ T299] ? sock_mmap+0xa0/0xa0 [ 24.235897][ T299] __fput+0x2dc/0x730 [ 24.239887][ T299] ____fput+0x15/0x20 [ 24.243869][ T299] task_work_run+0x127/0x190 [ 24.248487][ T299] do_exit+0xa7c/0x24e0 [ 24.252920][ T299] ? __kasan_check_write+0x14/0x20 [ 24.258043][ T299] ? switch_fpu_return+0x19c/0x330 [ 24.263175][ T299] ? put_task_struct+0x90/0x90 [ 24.267956][ T299] ? fpu__clear_all+0x20/0x20 [ 24.272643][ T299] ? __kasan_check_read+0x11/0x20 [ 24.277671][ T299] __x64_sys_exit+0x40/0x40 [ 24.282178][ T299] do_syscall_64+0x31/0x40 [ 24.286604][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.292532][ T299] RIP: 0033:0x7f39b9024859 [ 24.296956][ T299] Code: Unable to access opcode bytes at RIP 0x7f39b902482f. [ 24.304331][ T299] RSP: 002b:00007f39b9006118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 24.312756][ T299] RAX: ffffffffffffffda RBX: 00007f39b90d3b48 RCX: 00007f39b9024859 [ 24.320736][ T299] RDX: 00007f39b90069c8 RSI: 0000000000000000 RDI: 0000000000000000 [ 24.328716][ T299] RBP: 00007f39b90d3b40 R08: 0000000000000000 R09: 0000000023800000 [ 24.336693][ T299] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f39b909f028 [ 24.344685][ T299] R13: 0000200000000040 R14: 0000200000000908 R15: 0000200000000900 [ 24.352670][ T299] [ 24.355002][ T299] Allocated by task 298: [ 24.359252][ T299] __kasan_kmalloc+0xd4/0x100 [ 24.363929][ T299] __kmalloc+0x19f/0x330 [ 24.368172][ T299] l2tp_session_create+0x39/0xb60 [ 24.373202][ T299] pppol2tp_connect+0xbf5/0x1640 [ 24.378141][ T299] __sys_connect+0x3ce/0x450 [ 24.382735][ T299] __x64_sys_connect+0x7a/0x90 [ 24.387500][ T299] do_syscall_64+0x31/0x40 [ 24.391916][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.397801][ T299] [ 24.400137][ T299] Freed by task 9: [ 24.403867][ T299] kasan_set_track+0x4a/0x70 [ 24.408460][ T299] kasan_set_free_info+0x23/0x40 [ 24.413395][ T299] ____kasan_slab_free+0x125/0x160 [ 24.418519][ T299] __kasan_slab_free+0x11/0x20 [ 24.423286][ T299] slab_free_freelist_hook+0xc5/0x190 [ 24.428662][ T299] kfree+0xc0/0x270 [ 24.432483][ T299] l2tp_session_put+0xb2/0x1a0 [ 24.437243][ T299] l2tp_session_delete+0x3a9/0x4a0 [ 24.442374][ T299] l2tp_tunnel_del_work+0x180/0x3d0 [ 24.447574][ T299] process_one_work+0x6fd/0xbc0 [ 24.452419][ T299] worker_thread+0xa8e/0x13c0 [ 24.457095][ T299] kthread+0x324/0x3b0 [ 24.461163][ T299] ret_from_fork+0x1f/0x30 [ 24.465571][ T299] [ 24.467904][ T299] The buggy address belongs to the object at ffff888122065000 [ 24.467904][ T299] which belongs to the cache kmalloc-512 of size 512 [ 24.482063][ T299] The buggy address is located 0 bytes inside of [ 24.482063][ T299] 512-byte region [ffff888122065000, ffff888122065200) [ 24.495169][ T299] The buggy address belongs to the page: [ 24.500834][ T299] page:ffffea0004881900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x122064 [ 24.511100][ T299] head:ffffea0004881900 order:2 compound_mapcount:0 compound_pincount:0 [ 24.519466][ T299] flags: 0x4000000000010200(slab|head) [ 24.524937][ T299] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 24.533541][ T299] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.542136][ T299] page dumped because: kasan: bad access detected [ 24.548564][ T299] page_owner tracks the page as allocated [ 24.554289][ 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 292, ts 23827735799, free_ts 0 [ 24.572462][ T299] prep_new_page+0x176/0x190 [ 24.577057][ T299] get_page_from_freelist+0x225f/0x23f0 [ 24.582608][ T299] __alloc_pages_nodemask+0x29a/0x640 [ 24.587981][ T299] new_slab+0x84/0x3f0 [ 24.592052][ T299] ___slab_alloc+0x2f8/0x4c0 [ 24.596638][ T299] __slab_alloc+0x63/0xa0 [ 24.600968][ T299] __kmalloc_track_caller+0x1e4/0x310 [ 24.606345][ T299] __alloc_skb+0xdc/0x520 [ 24.610675][ T299] alloc_skb_with_frags+0xa3/0x560 [ 24.615800][ T299] sock_alloc_send_pskb+0x87f/0x9a0 [ 24.621001][ T299] unix_stream_sendmsg+0x4c9/0xbe0 [ 24.626112][ T299] sock_write_iter+0x2a6/0x3a0 [ 24.630895][ T299] vfs_write+0x770/0xd70 [ 24.635140][ T299] ksys_write+0x14a/0x260 [ 24.639469][ T299] __x64_sys_write+0x7b/0x90 [ 24.644058][ T299] do_syscall_64+0x31/0x40 [ 24.648479][ T299] page_owner free stack trace missing [ 24.653847][ T299] [ 24.656177][ T299] Memory state around the buggy address: [ 24.661904][ T299] ffff888122064f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.670082][ T299] ffff888122064f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.678158][ T299] >ffff888122065000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.686215][ T299] ^ [ 24.690283][ T299] ffff888122065080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.698360][ T299] ffff888122065100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.706417][ T299] ================================================================== [ 24.714581][ T299] Disabling lock debugging due to kernel taint [ 24.721117][ T299] ------------[ cut here ]------------ [ 24.726696][ T299] WARNING: CPU: 0 PID: 299 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 24.730237][ T24] audit: type=1400 audit(1787525642.500:68): 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 [ 24.736691][ T299] Modules linked in: [ 24.736739][ T299] CPU: 0 PID: 299 Comm: syz-executor302 Tainted: G B syzkaller #0 [ 24.771447][ T299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.773357][ T24] audit: type=1400 audit(1787525642.530:69): 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 [ 24.782229][ T299] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 24.803704][ T24] audit: type=1400 audit(1787525642.530:70): 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 [ 24.810229][ T299] Code: 5d c3 e8 9c bc 35 fd be 02 00 00 00 eb 0a e8 90 bc 35 fd be 01 00 00 00 4c 89 f7 e8 13 13 0f fe e9 0f ff ff ff e8 79 bc 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 68 bc 35 fd 4c 89 f7 be 03 [ 24.831120][ T24] audit: type=1400 audit(1787525642.530:71): 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 [ 24.850686][ T299] RSP: 0018:ffffc90000b57c40 EFLAGS: 00010293 [ 24.871271][ T24] audit: type=1400 audit(1787525642.530:72): 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 [ 24.877479][ T299] RAX: ffffffff842ef547 RBX: ffff88810aec6000 RCX: ffff88812205cf00 [ 24.897737][ T24] audit: type=1400 audit(1787525642.530:73): 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 [ 24.905818][ T299] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 24.936340][ T299] RBP: ffffc90000b57c60 R08: 0000000000000003 R09: 0000000000000004 [ 24.944314][ T299] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 24.952326][ T299] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888122065000 [ 24.960342][ T299] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 24.969327][ T299] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.975939][ T299] CR2: 00000000006a9ee0 CR3: 000000010d514000 CR4: 00000000003506b0 [ 24.984380][ T299] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.992459][ T299] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.000598][ T299] Call Trace: [ 25.003886][ T299] pppol2tp_release+0x150/0x2b0 [ 25.008806][ T299] sock_close+0xb8/0x200 [ 25.013064][ T299] ? sock_mmap+0xa0/0xa0 [ 25.017373][ T299] __fput+0x2dc/0x730 [ 25.021372][ T299] ____fput+0x15/0x20 [ 25.025398][ T299] task_work_run+0x127/0x190 [ 25.030344][ T299] do_exit+0xa7c/0x24e0 [ 25.034958][ T299] ? __kasan_check_write+0x14/0x20 [ 25.040141][ T299] ? switch_fpu_return+0x19c/0x330 [ 25.045319][ T299] ? put_task_struct+0x90/0x90 [ 25.050091][ T299] ? fpu__clear_all+0x20/0x20 [ 25.054769][ T299] ? __kasan_check_read+0x11/0x20 [ 25.059848][ T299] __x64_sys_exit+0x40/0x40 [ 25.064367][ T299] do_syscall_64+0x31/0x40 [ 25.068852][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.074763][ T299] RIP: 0033:0x7f39b9024859 [ 25.079223][ T299] Code: Unable to access opcode bytes at RIP 0x7f39b902482f. [ 25.086720][ T299] RSP: 002b:00007f39b9006118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.095143][ T299] RAX: ffffffffffffffda RBX: 00007f39b90d3b48 RCX: 00007f39b9024859 [ 25.103158][ T299] RDX: 00007f39b90069c8 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.111329][ T299] RBP: 00007f39b90d3b40 R08: 0000000000000000 R09: 0000000023800000 [ 25.119601][ T