ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2525817117 <...> rocess permissive=1 [ 15.860128][ T24] audit: type=1400 audit(1789055804.829:63): avc: denied { siginh } for pid=231 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.0.40' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2525817117", ["ci2-android-5-10/syz-executor2525817117"], 0x7ffd0d839580 /* 10 vars */) = 0 brk(NULL) = 0x5555891e8000 brk(0x5555891e8d40) = 0x5555891e8d40 arch_prctl(ARCH_SET_FS, 0x5555891e83c0) = 0 set_tid_address(0x5555891e8690) = 297 set_robust_list(0x5555891e86a0, 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-executor2525817117", 4096) = 45 getrandom("\x6d\xe1\x13\xb0\x32\xe7\x44\x77", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555891e8d40 brk(0x555589209d40) = 0x555589209d40 brk(0x55558920a000) = 0x55558920a000 mprotect(0x7f75f73bc000, 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 close(3) = -1 EBADF (Bad file descriptor) socket(AF_PPPOX, SOCK_STREAM, 1) = 3 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\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 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) exit_group(0) = ? +++ exited with 0 +++ [ 24.949039][ T24] audit: type=1400 audit(1789055813.939:64): avc: denied { execmem } for pid=297 comm="syz-executor252" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.968723][ T24] audit: type=1400 audit(1789055813.949:65): avc: denied { create } for pid=297 comm="syz-executor252" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.988774][ T24] audit: type=1400 audit(1789055813.949:66): avc: denied { connect } for pid=297 comm="syz-executor252" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.008758][ T24] audit: type=1400 audit(1789055813.959:67): avc: denied { ioctl } for pid=297 comm="syz-executor252" path="socket:[14421]" dev="sockfs" ino=14421 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.139414][ T298] ================================================================== [ 25.147509][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.155559][ T298] Read of size 4 at addr ffff888102db4400 by task syz-executor252/298 [ 25.163683][ T298] [ 25.166002][ T298] CPU: 1 PID: 298 Comm: syz-executor252 Not tainted syzkaller #0 [ 25.173686][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.183715][ T298] Call Trace: [ 25.186981][ T298] __dump_stack+0x21/0x24 [ 25.191280][ T298] dump_stack_lvl+0x1a7/0x208 [ 25.195927][ T298] ? show_regs_print_info+0x18/0x18 [ 25.201092][ T298] ? thaw_kernel_threads+0x220/0x220 [ 25.206351][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 25.211865][ T298] print_address_description+0x7f/0x2c0 [ 25.217385][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.223073][ T298] kasan_report+0x100/0x140 [ 25.227551][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.233243][ T298] __asan_report_load4_noabort+0x14/0x20 [ 25.238847][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.244379][ T298] pppol2tp_release+0x150/0x2b0 [ 25.249208][ T298] sock_close+0xb8/0x200 [ 25.253426][ T298] ? sock_mmap+0xa0/0xa0 [ 25.257648][ T298] __fput+0x2dc/0x730 [ 25.261604][ T298] ____fput+0x15/0x20 [ 25.265558][ T298] task_work_run+0x127/0x190 [ 25.270136][ T298] do_exit+0xa7c/0x24e0 [ 25.274266][ T298] ? __kasan_check_write+0x14/0x20 [ 25.279354][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.284439][ T298] ? put_task_struct+0x90/0x90 [ 25.289173][ T298] ? fpu__clear_all+0x20/0x20 [ 25.293822][ T298] ? __kasan_check_read+0x11/0x20 [ 25.298815][ T298] __x64_sys_exit+0x40/0x40 [ 25.303306][ T298] do_syscall_64+0x31/0x40 [ 25.307712][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.313588][ T298] RIP: 0033:0x7f75f732bd79 [ 25.317987][ T298] Code: Unable to access opcode bytes at RIP 0x7f75f732bd4f. [ 25.325329][ T298] RSP: 002b:00007fff00e61848 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.333719][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f75f732bd79 [ 25.341664][ T298] RDX: 00007f75f733d557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.349627][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.357581][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff00e61a68 [ 25.365534][ T298] R13: 0000000000000002 R14: 00007f75f73bcca0 R15: 0000000000000002 [ 25.373485][ T298] [ 25.375796][ T298] Allocated by task 297: [ 25.380138][ T298] __kasan_kmalloc+0xd4/0x100 [ 25.384808][ T298] __kmalloc+0x19f/0x330 [ 25.389032][ T298] l2tp_session_create+0x39/0xb60 [ 25.394039][ T298] pppol2tp_connect+0xbf5/0x1640 [ 25.398963][ T298] __sys_connect+0x3ce/0x450 [ 25.403529][ T298] __x64_sys_connect+0x7a/0x90 [ 25.408269][ T298] do_syscall_64+0x31/0x40 [ 25.412668][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.418529][ T298] [ 25.420833][ T298] Freed by task 7: [ 25.424532][ T298] kasan_set_track+0x4a/0x70 [ 25.429096][ T298] kasan_set_free_info+0x23/0x40 [ 25.434009][ T298] ____kasan_slab_free+0x125/0x160 [ 25.439098][ T298] __kasan_slab_free+0x11/0x20 [ 25.443839][ T298] slab_free_freelist_hook+0xc5/0x190 [ 25.449964][ T298] kfree+0xc0/0x270 [ 25.453747][ T298] l2tp_session_put+0xb2/0x1a0 [ 25.458481][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 25.463566][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 25.468734][ T298] process_one_work+0x6fd/0xbc0 [ 25.473559][ T298] worker_thread+0xa8e/0x13c0 [ 25.478213][ T298] kthread+0x324/0x3b0 [ 25.482255][ T298] ret_from_fork+0x1f/0x30 [ 25.486639][ T298] [ 25.488943][ T298] The buggy address belongs to the object at ffff888102db4400 [ 25.488943][ T298] which belongs to the cache kmalloc-512 of size 512 [ 25.502970][ T298] The buggy address is located 0 bytes inside of [ 25.502970][ T298] 512-byte region [ffff888102db4400, ffff888102db4600) [ 25.516039][ T298] The buggy address belongs to the page: [ 25.521662][ T298] page:ffffea00040b6d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102db4 [ 25.531871][ T298] head:ffffea00040b6d00 order:2 compound_mapcount:0 compound_pincount:0 [ 25.540176][ T298] flags: 0x4000000000010200(slab|head) [ 25.545617][ T298] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 25.554173][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.562728][ T298] page dumped because: kasan: bad access detected [ 25.569119][ T298] page_owner tracks the page as allocated [ 25.574825][ 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 297, ts 24943363235, free_ts 19087208940 [ 25.593806][ T298] prep_new_page+0x176/0x190 [ 25.598371][ T298] get_page_from_freelist+0x225f/0x23f0 [ 25.603888][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 25.609233][ T298] new_slab+0x84/0x3f0 [ 25.613278][ T298] ___slab_alloc+0x2f8/0x4c0 [ 25.617841][ T298] __slab_alloc+0x63/0xa0 [ 25.622145][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 25.627489][ T298] alloc_bprm+0x59/0x630 [ 25.631704][ T298] do_execveat_common+0x1b1/0xab0 [ 25.636704][ T298] __x64_sys_execve+0x92/0xb0 [ 25.641353][ T298] do_syscall_64+0x31/0x40 [ 25.645747][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.651614][ T298] page last free stack trace: [ 25.656269][ T298] __free_pages_ok+0x80b/0x830 [ 25.661008][ T298] __free_pages+0xd8/0x390 [ 25.665415][ T298] __free_slab+0xcf/0x190 [ 25.669724][ T298] unfreeze_partials+0x150/0x180 [ 25.674635][ T298] put_cpu_partial+0xc1/0x180 [ 25.679283][ T298] __slab_free+0x2c9/0x3a0 [ 25.683673][ T298] ___cache_free+0x10e/0x130 [ 25.688237][ T298] qlink_free+0x50/0x90 [ 25.692367][ T298] qlist_free_all+0x5f/0xb0 [ 25.696849][ T298] kasan_quarantine_reduce+0x14a/0x160 [ 25.702280][ T298] __kasan_slab_alloc+0x2f/0xe0 [ 25.707106][ T298] slab_post_alloc_hook+0x5d/0x2f0 [ 25.712195][ T298] kmem_cache_alloc+0x15a/0x2d0 [ 25.717032][ T298] vm_area_alloc+0x24/0x160 [ 25.721528][ T298] mmap_region+0xa5e/0x19c0 [ 25.726015][ T298] do_mmap+0x85f/0xf50 [ 25.730059][ T298] [ 25.732371][ T298] Memory state around the buggy address: [ 25.738001][ T298] ffff888102db4300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.746042][ T298] ffff888102db4380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.754079][ T298] >ffff888102db4400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.762117][ T298] ^ [ 25.766157][ T298] ffff888102db4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.774191][ T298] ffff888102db4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.782319][ T298] ================================================================== [ 25.790350][ T298] Disabling lock debugging due to kernel taint [ 25.799117][ T298] ------------[ cut here ]------------ [ 25.800745][ T24] audit: type=1400 audit(1789055814.789:68): 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 [ 25.804684][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 25.827671][ T24] audit: type=1400 audit(1789055814.789:69): 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 [ 25.853561][ T298] Modules linked in: [ 25.858040][ T24] audit: type=1400 audit(1789055814.789:70): 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 [ 25.861321][ T298] CPU: 0 PID: 298 Comm: syz-executor252 Tainted: G B syzkaller #0 [ 25.861327][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.861344][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 25.861352][ T298] Code: 5d c3 e8 2c 5a 35 fd be 02 00 00 00 eb 0a e8 20 5a 35 fd be 01 00 00 00 4c 89 f7 e8 63 ca 0e fe e9 0f ff ff ff e8 09 5a 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 f8 59 35 fd 4c 89 f7 be 03 [ 25.861365][ T298] RSP: 0018:ffffc90000b47c40 EFLAGS: 00010293 [ 25.883129][ T24] audit: type=1400 audit(1789055814.789:71): 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 [ 25.938437][ T298] [ 25.956294][ T24] audit: type=1400 audit(1789055814.789:72): 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 [ 25.958638][ T298] RAX: ffffffff842f5aa7 RBX: ffff88810acf5800 RCX: ffff88811befbc00 [ 25.978945][ T24] audit: type=1400 audit(1789055814.789:73): 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 [ 25.990567][ T298] RDX: 0000000000000000 RSI: 000000001036bf00 RDI: 000000000c04eb7d [ 26.017603][ T298] RBP: ffffc90000b47c60 R08: 0000000000000003 R09: 0000000000000004 [ 26.025642][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 26.033695][ T298] R13: dffffc0000000000 R14: 000000001036bf00 R15: ffff888102db4400 [ 26.041714][ T298] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 26.050759][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.057383][ T298] CR2: 00007f75f733d4f0 CR3: 000000000640f000 CR4: 00000000003506a0 [ 26.065458][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.073483][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.081524][ T298] Call Trace: [ 26.084855][ T298] pppol2tp_release+0x150/0x2b0 [ 26.089747][ T298] sock_close+0xb8/0x200 [ 26.094054][ T298] ? sock_mmap+0xa0/0xa0 [ 26.098351][ T298] __fput+0x2dc/0x730 [ 26.102379][ T298] ____fput+0x15/0x20 [ 26.106391][ T298] task_work_run+0x127/0x190 [ 26.110970][ T298] do_exit+0xa7c/0x24e0 [ 26.115137][ T298] ? __kasan_check_write+0x14/0x20 [ 26.120234][ T298] ? switch_fpu_return+0x19c/0x330 [ 26.125342][ T298] ? put_task_struct+0x90/0x90 [ 26.130085][ T298] ? fpu__clear_all+0x20/0x20 [ 26.134762][ T298] ? __kasan_check_read+0x11/0x20 [ 26.139783][ T298] __x64_sys_exit+0x40/0x40 [ 26.144290][ T298] do_syscall_64+0x31/0x40 [ 26.148690][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.154580][ T298] RIP: 0033:0x7f75f732bd79 [ 26.158973][ T298] Code: Unable to access opcode bytes at RIP 0x7f75f732bd4f. [ 26.166352][ T298] RSP: 002b:00007fff00e61848 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.174777][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f75f732bd79 [ 26.182739][ T298] RDX: 00007f75f733d557 RSI: 0000000000000000 RDI: 0000000000000000 [ 26.190705][ T298] RBP: 00000000