ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1509986271 <...> Warning: Permanently added '10.128.0.185' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1509986271", ["ci2-android-5-10/syz-executor1509986271"], 0x7ffd5bb5dec0 /* 10 vars */) = 0 brk(NULL) = 0x55555ea67000 brk(0x55555ea67d40) = 0x55555ea67d40 arch_prctl(ARCH_SET_FS, 0x55555ea673c0) = 0 set_tid_address(0x55555ea67690) = 297 set_robust_list(0x55555ea676a0, 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-executor1509986271", 4096) = 45 getrandom("\xc1\x2c\xb7\x69\x6f\xa5\xb6\xe3", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555ea67d40 brk(0x55555ea88d40) = 0x55555ea88d40 brk(0x55555ea89000) = 0x55555ea89000 mprotect(0x7f515a8f5000, 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 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 +++ [ 24.033960][ T24] audit: type=1400 audit(1794394298.020:64): avc: denied { execmem } for pid=297 comm="syz-executor150" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.053421][ T24] audit: type=1400 audit(1794394298.030:65): avc: denied { create } for pid=297 comm="syz-executor150" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.073506][ T24] audit: type=1400 audit(1794394298.030:66): avc: denied { connect } for pid=297 comm="syz-executor150" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.093467][ T24] audit: type=1400 audit(1794394298.040:67): avc: denied { ioctl } for pid=297 comm="syz-executor150" path="socket:[14174]" dev="sockfs" ino=14174 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.224094][ T298] ================================================================== [ 24.232212][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.240247][ T298] Read of size 4 at addr ffff888101d92800 by task syz-executor150/298 [ 24.248362][ T298] [ 24.250692][ T298] CPU: 1 PID: 298 Comm: syz-executor150 Not tainted syzkaller #0 [ 24.258379][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 [ 24.268411][ T298] Call Trace: [ 24.271678][ T298] __dump_stack+0x21/0x24 [ 24.275978][ T298] dump_stack_lvl+0x1a7/0x208 [ 24.280625][ T298] ? show_regs_print_info+0x18/0x18 [ 24.285820][ T298] ? thaw_kernel_threads+0x220/0x220 [ 24.291110][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 24.296285][ T298] print_address_description+0x7f/0x2c0 [ 24.301808][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.307497][ T298] kasan_report+0x100/0x140 [ 24.311974][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.317669][ T298] __asan_report_load4_noabort+0x14/0x20 [ 24.323275][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.328793][ T298] pppol2tp_release+0x150/0x2b0 [ 24.333616][ T298] sock_close+0xb8/0x200 [ 24.337829][ T298] ? sock_mmap+0xa0/0xa0 [ 24.342045][ T298] __fput+0x2dc/0x730 [ 24.346001][ T298] ____fput+0x15/0x20 [ 24.349972][ T298] task_work_run+0x127/0x190 [ 24.354534][ T298] do_exit+0xa7c/0x24e0 [ 24.358662][ T298] ? __kasan_check_write+0x14/0x20 [ 24.363745][ T298] ? switch_fpu_return+0x19c/0x330 [ 24.368827][ T298] ? put_task_struct+0x90/0x90 [ 24.373561][ T298] ? fpu__clear_all+0x20/0x20 [ 24.378210][ T298] ? __kasan_check_read+0x11/0x20 [ 24.383210][ T298] __x64_sys_exit+0x40/0x40 [ 24.387687][ T298] do_syscall_64+0x31/0x40 [ 24.392079][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.397963][ T298] RIP: 0033:0x7f515a864d79 [ 24.402350][ T298] Code: Unable to access opcode bytes at RIP 0x7f515a864d4f. [ 24.409689][ T298] RSP: 002b:00007ffd8c2f44c8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 24.418074][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f515a864d79 [ 24.426032][ T298] RDX: 00007f515a876557 RSI: 0000000000000000 RDI: 0000000000000000 [ 24.433992][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 24.441950][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd8c2f46e8 [ 24.449898][ T298] R13: 0000000000000002 R14: 00007f515a8f5ca0 R15: 0000000000000002 [ 24.457849][ T298] [ 24.460154][ T298] Allocated by task 297: [ 24.464375][ T298] __kasan_kmalloc+0xd4/0x100 [ 24.469027][ T298] __kmalloc+0x19f/0x330 [ 24.473250][ T298] l2tp_session_create+0x39/0xb60 [ 24.478253][ T298] pppol2tp_connect+0xbf5/0x1640 [ 24.483167][ T298] __sys_connect+0x3ce/0x450 [ 24.487731][ T298] __x64_sys_connect+0x7a/0x90 [ 24.492468][ T298] do_syscall_64+0x31/0x40 [ 24.496871][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.502732][ T298] [ 24.505037][ T298] Freed by task 7: [ 24.508734][ T298] kasan_set_track+0x4a/0x70 [ 24.513310][ T298] kasan_set_free_info+0x23/0x40 [ 24.518227][ T298] ____kasan_slab_free+0x125/0x160 [ 24.523312][ T298] __kasan_slab_free+0x11/0x20 [ 24.528048][ T298] slab_free_freelist_hook+0xc5/0x190 [ 24.533392][ T298] kfree+0xc0/0x270 [ 24.537175][ T298] l2tp_session_put+0xb2/0x1a0 [ 24.541914][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 24.546997][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 24.552170][ T298] process_one_work+0x6fd/0xbc0 [ 24.556993][ T298] worker_thread+0xa8e/0x13c0 [ 24.561647][ T298] kthread+0x324/0x3b0 [ 24.565687][ T298] ret_from_fork+0x1f/0x30 [ 24.570069][ T298] [ 24.572377][ T298] The buggy address belongs to the object at ffff888101d92800 [ 24.572377][ T298] which belongs to the cache kmalloc-512 of size 512 [ 24.586404][ T298] The buggy address is located 0 bytes inside of [ 24.586404][ T298] 512-byte region [ffff888101d92800, ffff888101d92a00) [ 24.599473][ T298] The buggy address belongs to the page: [ 24.605099][ T298] page:ffffea0004076400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101d90 [ 24.615310][ T298] head:ffffea0004076400 order:2 compound_mapcount:0 compound_pincount:0 [ 24.623618][ T298] flags: 0x4000000000010200(slab|head) [ 24.629056][ T298] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 24.637618][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.646170][ T298] page dumped because: kasan: bad access detected [ 24.652554][ T298] page_owner tracks the page as allocated [ 24.658251][ 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 293, ts 23962645533, free_ts 23889027379 [ 24.677237][ T298] prep_new_page+0x176/0x190 [ 24.681801][ T298] get_page_from_freelist+0x225f/0x23f0 [ 24.687326][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 24.692670][ T298] new_slab+0x84/0x3f0 [ 24.696725][ T298] ___slab_alloc+0x2f8/0x4c0 [ 24.701302][ T298] __slab_alloc+0x63/0xa0 [ 24.705605][ T298] __kmalloc_track_caller+0x1e4/0x310 [ 24.710951][ T298] __alloc_skb+0xdc/0x520 [ 24.715254][ T298] alloc_skb_with_frags+0xa3/0x560 [ 24.720337][ T298] sock_alloc_send_pskb+0x87f/0x9a0 [ 24.725508][ T298] unix_stream_sendmsg+0x4c9/0xbe0 [ 24.730590][ T298] sock_write_iter+0x2a6/0x3a0 [ 24.735353][ T298] vfs_write+0x770/0xd70 [ 24.739569][ T298] ksys_write+0x14a/0x260 [ 24.743871][ T298] __x64_sys_write+0x7b/0x90 [ 24.748433][ T298] do_syscall_64+0x31/0x40 [ 24.752822][ T298] page last free stack trace: [ 24.757474][ T298] free_unref_page_prepare+0x2b7/0x2d0 [ 24.762906][ T298] __free_pages+0x146/0x390 [ 24.767382][ T298] __free_slab+0xcf/0x190 [ 24.771703][ T298] unfreeze_partials+0x150/0x180 [ 24.776616][ T298] put_cpu_partial+0xc1/0x180 [ 24.781263][ T298] __slab_free+0x2c9/0x3a0 [ 24.785653][ T298] ___cache_free+0x10e/0x130 [ 24.790215][ T298] qlink_free+0x50/0x90 [ 24.794364][ T298] qlist_free_all+0x5f/0xb0 [ 24.798839][ T298] kasan_quarantine_reduce+0x14a/0x160 [ 24.804273][ T298] __kasan_slab_alloc+0x2f/0xe0 [ 24.809098][ T298] slab_post_alloc_hook+0x5d/0x2f0 [ 24.814184][ T298] kmem_cache_alloc+0x15a/0x2d0 [ 24.819010][ T298] getname_flags+0xba/0x510 [ 24.823484][ T298] getname+0x19/0x20 [ 24.827357][ T298] __x64_sys_execve+0x78/0xb0 [ 24.832014][ T298] [ 24.834315][ T298] Memory state around the buggy address: [ 24.839923][ T298] ffff888101d92700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.847958][ T298] ffff888101d92780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.855994][ T298] >ffff888101d92800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.864026][ T298] ^ [ 24.868072][ T298] ffff888101d92880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.876109][ T298] ffff888101d92900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.884139][ T298] ================================================================== [ 24.892170][ T298] Disabling lock debugging due to kernel taint [ 24.898516][ T298] ------------[ cut here ]------------ [ 24.904258][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 24.907220][ T24] audit: type=1400 audit(1794394298.900:68): 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 [ 24.914263][ T298] Modules linked in: [ 24.939757][ T298] CPU: 0 PID: 298 Comm: syz-executor150 Tainted: G B syzkaller #0 [ 24.939793][ T24] audit: type=1400 audit(1794394298.900:69): 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 [ 24.948872][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 [ 24.970229][ T24] audit: type=1400 audit(1794394298.900:70): 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 [ 24.980131][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 25.001341][ T24] audit: type=1400 audit(1794394298.900:71): 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 [ 25.007537][ T298] Code: 5d c3 e8 7c b3 34 fd be 02 00 00 00 eb 0a e8 70 b3 34 fd be 01 00 00 00 4c 89 f7 e8 f3 31 0e fe e9 0f ff ff ff e8 59 b3 34 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 48 b3 34 fd 4c 89 f7 be 03 [ 25.028102][ T24] audit: type=1400 audit(1794394298.900:72): 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 [ 25.047551][ T298] RSP: 0018:ffffc9000092fc40 EFLAGS: 00010293 [ 25.068077][ T24] audit: type=1400 audit(1794394298.900:73): 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 [ 25.073897][ T298] RAX: ffffffff843003c7 RBX: ffff88811d3a3800 RCX: ffff8881055ad000 [ 25.073909][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 25.112582][ T298] RBP: ffffc9000092fc60 R08: 0000000000000003 R09: 0000000000000004 [ 25.120545][ T298] R10: dffffc0000000000 R11: fffffbfff0dcfa48 R12: dffffc0000000000 [ 25.128523][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888101d92800 [ 25.136511][ T298] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 25.145444][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.152022][ T298] CR2: 00000000006a9ee0 CR3: 000000010d4da000 CR4: 00000000003506b0 [ 25.159986][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.167967][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.175939][ T298] Call Trace: [ 25.179206][ T298] pppol2tp_release+0x150/0x2b0 [ 25.184058][ T298] sock_close+0xb8/0x200 [ 25.188284][ T298] ? sock_mmap+0xa0/0xa0 [ 25.192531][ T298] __fput+0x2dc/0x730 [ 25.196497][ T298] ____fput+0x15/0x20 [ 25.200455][ T298] task_work_run+0x127/0x190 [ 25.205046][ T298] do_exit+0xa7c/0x24e0 [ 25.209185][ T298] ? __kasan_check_write+0x14/0x20 [ 25.214299][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.219398][ T298] ? put_task_struct+0x90/0x90 [ 25.224199][ T298] ? fpu__clear_all+0x20/0x20 [ 25.228871][ T298] ? __kasan_check_read+0x11/0x20 [ 25.233920][ T298] __x64_sys_exit+0x40/0x40 [ 25.238406][ T298] do_syscall_64+0x31/0x40 [ 25.242824][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.248704][ T298] RIP: 0033:0x7f515a864d79 [ 25.253114][ T298] Code: Unable to access opcode bytes at RIP 0x7f515a864d4f. [ 25.260472][ T298] RSP: 002b:00007ffd8c2f44c8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.268902][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f515a864d79 [ 25.276889][ T298] RDX