ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor3336789279 <...> Warning: Permanently added '10.128.1.8' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor3336789279", ["ci2-android-5-10/syz-executor3336789279"], 0x7ffed38c3480 /* 10 vars */) = 0 brk(NULL) = 0x55555b76f000 brk(0x55555b76fd40) = 0x55555b76fd40 arch_prctl(ARCH_SET_FS, 0x55555b76f3c0) = 0 set_tid_address(0x55555b76f690) = 297 set_robust_list(0x55555b76f6a0, 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-executor3336789279", 4096) = 45 getrandom("\xef\x3c\x56\x07\x96\xc7\x1f\x18", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555b76fd40 brk(0x55555b790d40) = 0x55555b790d40 brk(0x55555b791000) = 0x55555b791000 mprotect(0x7fe571864000, 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 socket(AF_PPPOX, SOCK_STREAM, 1) = 3 executing program socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 4 connect(3, {sa_family=AF_PPPOX, sa_data="\x01\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x4e\x24\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 sendfile(-1, -1, [3], 2757) = -1 EBADF (Bad file descriptor) 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) = 298 ioctl(3, PPPIOCSMRU, 0) = -1 ENOSYS (Function not implemented) write(-1, NULL, 21) = -1 EBADF (Bad file descriptor) exit_group(0) = ? +++ exited with 0 +++ [ 23.799503][ T24] audit: type=1400 audit(1790417536.989:64): avc: denied { execmem } for pid=297 comm="syz-executor333" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 23.818926][ T24] audit: type=1400 audit(1790417536.989:65): avc: denied { create } for pid=297 comm="syz-executor333" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.838841][ T24] audit: type=1400 audit(1790417536.989:66): avc: denied { connect } for pid=297 comm="syz-executor333" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.858635][ T24] audit: type=1400 audit(1790417537.009:67): avc: denied { ioctl } for pid=297 comm="syz-executor333" path="socket:[14501]" dev="sockfs" ino=14501 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.989663][ T298] ================================================================== [ 23.997740][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.005776][ T298] Read of size 4 at addr ffff88811df38c00 by task syz-executor333/298 [ 24.013895][ T298] [ 24.016229][ T298] CPU: 0 PID: 298 Comm: syz-executor333 Not tainted syzkaller #0 [ 24.023926][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.033951][ T298] Call Trace: [ 24.037212][ T298] __dump_stack+0x21/0x24 [ 24.041512][ T298] dump_stack_lvl+0x1a7/0x208 [ 24.046158][ T298] ? show_regs_print_info+0x18/0x18 [ 24.051327][ T298] ? thaw_kernel_threads+0x220/0x220 [ 24.056582][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 24.061752][ T298] print_address_description+0x7f/0x2c0 [ 24.067267][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.072954][ T298] kasan_report+0x100/0x140 [ 24.077427][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.083116][ T298] __asan_report_load4_noabort+0x14/0x20 [ 24.088718][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.094259][ T298] pppol2tp_release+0x150/0x2b0 [ 24.099085][ T298] sock_close+0xb8/0x200 [ 24.103318][ T298] ? sock_mmap+0xa0/0xa0 [ 24.107537][ T298] __fput+0x2dc/0x730 [ 24.111492][ T298] ____fput+0x15/0x20 [ 24.115463][ T298] task_work_run+0x127/0x190 [ 24.120023][ T298] do_exit+0xa7c/0x24e0 [ 24.124148][ T298] ? __kasan_check_write+0x14/0x20 [ 24.129227][ T298] ? switch_fpu_return+0x19c/0x330 [ 24.134306][ T298] ? put_task_struct+0x90/0x90 [ 24.139039][ T298] ? fpu__clear_all+0x20/0x20 [ 24.143685][ T298] ? __kasan_check_read+0x11/0x20 [ 24.148680][ T298] __x64_sys_exit+0x40/0x40 [ 24.153153][ T298] do_syscall_64+0x31/0x40 [ 24.157565][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.163451][ T298] RIP: 0033:0x7fe5717d3d79 [ 24.167833][ T298] Code: Unable to access opcode bytes at RIP 0x7fe5717d3d4f. [ 24.175194][ T298] RSP: 002b:00007fffb69d6fc8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 24.183580][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fe5717d3d79 [ 24.191527][ T298] RDX: 00007fe5717e5557 RSI: 0000000000000000 RDI: 0000000000000000 [ 24.199474][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 24.207418][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffb69d71e8 [ 24.215364][ T298] R13: 0000000000000002 R14: 00007fe571864ca0 R15: 0000000000000002 [ 24.223306][ T298] [ 24.225608][ T298] Allocated by task 297: [ 24.229837][ T298] __kasan_kmalloc+0xd4/0x100 [ 24.234484][ T298] __kmalloc+0x19f/0x330 [ 24.238699][ T298] l2tp_session_create+0x39/0xb60 [ 24.243713][ T298] pppol2tp_connect+0xbf5/0x1640 [ 24.248623][ T298] __sys_connect+0x3ce/0x450 [ 24.253182][ T298] __x64_sys_connect+0x7a/0x90 [ 24.257913][ T298] do_syscall_64+0x31/0x40 [ 24.262299][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.268154][ T298] [ 24.270451][ T298] Freed by task 112: [ 24.274316][ T298] kasan_set_track+0x4a/0x70 [ 24.278893][ T298] kasan_set_free_info+0x23/0x40 [ 24.283798][ T298] ____kasan_slab_free+0x125/0x160 [ 24.289049][ T298] __kasan_slab_free+0x11/0x20 [ 24.293786][ T298] slab_free_freelist_hook+0xc5/0x190 [ 24.299128][ T298] kfree+0xc0/0x270 [ 24.302928][ T298] l2tp_session_put+0xb2/0x1a0 [ 24.307661][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 24.312758][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 24.317927][ T298] process_one_work+0x6fd/0xbc0 [ 24.322747][ T298] worker_thread+0xa8e/0x13c0 [ 24.327393][ T298] kthread+0x324/0x3b0 [ 24.331431][ T298] ret_from_fork+0x1f/0x30 [ 24.335813][ T298] [ 24.338121][ T298] The buggy address belongs to the object at ffff88811df38c00 [ 24.338121][ T298] which belongs to the cache kmalloc-512 of size 512 [ 24.352152][ T298] The buggy address is located 0 bytes inside of [ 24.352152][ T298] 512-byte region [ffff88811df38c00, ffff88811df38e00) [ 24.365220][ T298] The buggy address belongs to the page: [ 24.370839][ T298] page:ffffea000477ce00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11df38 [ 24.381041][ T298] head:ffffea000477ce00 order:2 compound_mapcount:0 compound_pincount:0 [ 24.389340][ T298] flags: 0x4000000000010200(slab|head) [ 24.394773][ T298] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 24.403325][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.411873][ T298] page dumped because: kasan: bad access detected [ 24.418253][ T298] page_owner tracks the page as allocated [ 24.423970][ T298] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 294, ts 23736746420, free_ts 18319298055 [ 24.442945][ T298] prep_new_page+0x176/0x190 [ 24.447504][ T298] get_page_from_freelist+0x225f/0x23f0 [ 24.453020][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 24.458362][ T298] new_slab+0x84/0x3f0 [ 24.462407][ T298] ___slab_alloc+0x2f8/0x4c0 [ 24.466969][ T298] __slab_alloc+0x63/0xa0 [ 24.471271][ T298] __kmalloc_track_caller+0x1e4/0x310 [ 24.476612][ T298] __alloc_skb+0xdc/0x520 [ 24.480911][ T298] sock_wmalloc+0xb5/0x130 [ 24.485298][ T298] unix_stream_connect+0x2f8/0xf90 [ 24.490378][ T298] __sys_connect+0x3ce/0x450 [ 24.494937][ T298] __x64_sys_connect+0x7a/0x90 [ 24.499689][ T298] do_syscall_64+0x31/0x40 [ 24.504078][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.509954][ T298] page last free stack trace: [ 24.514601][ T298] free_unref_page_prepare+0x2b7/0x2d0 [ 24.520047][ T298] free_unref_page+0x7f/0x190 [ 24.524696][ T298] __put_page+0xae/0xe0 [ 24.528822][ T298] anon_pipe_buf_release+0x165/0x1f0 [ 24.534072][ T298] pipe_read+0x563/0x1050 [ 24.538386][ T298] vfs_read+0x62a/0xa50 [ 24.542510][ T298] ksys_read+0x14a/0x260 [ 24.546723][ T298] __x64_sys_read+0x7b/0x90 [ 24.551196][ T298] do_syscall_64+0x31/0x40 [ 24.555600][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.561457][ T298] [ 24.563755][ T298] Memory state around the buggy address: [ 24.569355][ T298] ffff88811df38b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.577384][ T298] ffff88811df38b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.585414][ T298] >ffff88811df38c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.593461][ T298] ^ [ 24.597500][ T298] ffff88811df38c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.605532][ T298] ffff88811df38d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.613561][ T298] ================================================================== [ 24.621588][ T298] Disabling lock debugging due to kernel taint [ 24.627942][ T298] ------------[ cut here ]------------ [ 24.633446][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 24.637547][ T24] audit: type=1400 audit(1790417537.819:68): avc: denied { read } for pid=76 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 [ 24.643418][ T298] Modules linked in: [ 24.643437][ T298] CPU: 0 PID: 298 Comm: syz-executor333 Tainted: G B syzkaller #0 [ 24.665195][ T24] audit: type=1400 audit(1790417537.819:69): avc: denied { search } for pid=76 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 [ 24.668942][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.668964][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 24.678126][ T24] audit: type=1400 audit(1790417537.819:70): avc: denied { write } for pid=76 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 [ 24.699208][ T298] Code: 5d c3 e8 1c 5f 35 fd be 02 00 00 00 eb 0a e8 10 5f 35 fd be 01 00 00 00 4c 89 f7 e8 63 ca 0e fe e9 0f ff ff ff e8 f9 5e 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 e8 5e 35 fd 4c 89 f7 be 03 [ 24.709469][ T24] audit: type=1400 audit(1790417537.819:71): avc: denied { add_name } for pid=76 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 24.715552][ T298] RSP: 0018:ffffc90000b27c40 EFLAGS: 00010293 [ 24.736753][ T24] audit: type=1400 audit(1790417537.819:72): avc: denied { create } for pid=76 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 24.756302][ T298] [ 24.777301][ T24] audit: type=1400 audit(1790417537.819:73): avc: denied { append open } for pid=76 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 [ 24.782852][ T298] RAX: ffffffff842f55b7 RBX: ffff88811d488000 RCX: ffff888109b06400 [ 24.782859][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 24.782872][ T298] RBP: ffffc90000b27c60 R08: 0000000000000003 R09: 0000000000000004 [ 24.852150][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 24.860132][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88811df38c00 [ 24.868110][ T298] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 24.877020][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.883643][ T298] CR2: 00000000006a9ee0 CR3: 000000010d50d000 CR4: 00000000003506a0 [ 24.891613][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.899576][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.907529][ T298] Call Trace: [ 24.910817][ T298] pppol2tp_release+0x150/0x2b0 [ 24.915654][ T298] sock_close+0xb8/0x200 [ 24.919893][ T298] ? sock_mmap+0xa0/0xa0 [ 24.924120][ T298] __fput+0x2dc/0x730 [ 24.928069][ T298] ____fput+0x15/0x20 [ 24.932057][ T298] task_work_run+0x127/0x190 [ 24.936617][ T298] do_exit+0xa7c/0x24e0 [ 24.940766][ T298] ? __kasan_check_write+0x14/0x20 [ 24.945859][ T298] ? switch_fpu_return+0x19c/0x330 [ 24.950961][ T298] ? put_task_struct+0x90/0x90 [ 24.955709][ T298] ? fpu__clear_all+0x20/0x20 [ 24.960379][ T298] ? __kasan_check_read+0x11/0x20 [ 24.965382][ T298] __x64_sys_exit+0x40/0x40 [ 24.969883][ T298] do_syscall_64+0x31/0x40 [ 24.974282][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.980166][ T298] RIP: 0033:0x7fe5717d3d79 [ 24.984558][ T298] Code: Unable to access opcode bytes at RIP 0x7fe5717d3d4f. [ 24.991915][ T298] RSP: 002b:00007fffb69d6fc8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.000319][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fe5717d3d79 [ 25.008283][ T298] RDX: 00007fe5717e5557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.016235][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.024201][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffb69d71e8 [ 25.032168][ T298] R13: 0000000000000002 R14: 00007fe571864ca0 R15: 0000000000000002 [ 25.040154][ T298] ---[ end trace 248aa05eb