ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor3810688011 <...> Warning: Permanently added '10.128.0.83' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor3810688011", ["ci2-android-5-10/syz-executor3810688011"], 0x7ffd3fc5df20 /* 10 vars */) = 0 brk(NULL) = 0x5555576a0000 brk(0x5555576a0d40) = 0x5555576a0d40 arch_prctl(ARCH_SET_FS, 0x5555576a03c0) = 0 set_tid_address(0x5555576a0690) = 297 set_robust_list(0x5555576a06a0, 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-executor3810688011", 4096) = 45 getrandom("\x75\x67\x42\xff\x17\x9f\xd3\xe3", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555576a0d40 brk(0x5555576c1d40) = 0x5555576c1d40 brk(0x5555576c2000) = 0x5555576c2000 mprotect(0x7fe0add75000, 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 +++ [ 21.915734][ T24] audit: type=1400 audit(1791971830.899:64): avc: denied { execmem } for pid=297 comm="syz-executor381" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 21.935200][ T24] audit: type=1400 audit(1791971830.909:65): avc: denied { create } for pid=297 comm="syz-executor381" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 21.955108][ T24] audit: type=1400 audit(1791971830.909:66): avc: denied { connect } for pid=297 comm="syz-executor381" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 21.974918][ T24] audit: type=1400 audit(1791971830.919:67): avc: denied { ioctl } for pid=297 comm="syz-executor381" path="socket:[546]" dev="sockfs" ino=546 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 22.106092][ T298] ================================================================== [ 22.114192][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 22.122229][ T298] Read of size 4 at addr ffff8881045fa800 by task syz-executor381/298 [ 22.130344][ T298] [ 22.132697][ T298] CPU: 0 PID: 298 Comm: syz-executor381 Not tainted syzkaller #0 [ 22.140388][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 22.150429][ T298] Call Trace: [ 22.153699][ T298] __dump_stack+0x21/0x24 [ 22.157998][ T298] dump_stack_lvl+0x1a7/0x208 [ 22.162654][ T298] ? show_regs_print_info+0x18/0x18 [ 22.167836][ T298] ? thaw_kernel_threads+0x220/0x220 [ 22.173099][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 22.178272][ T298] print_address_description+0x7f/0x2c0 [ 22.183790][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 22.189496][ T298] kasan_report+0x100/0x140 [ 22.193972][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 22.199664][ T298] __asan_report_load4_noabort+0x14/0x20 [ 22.205270][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 22.210785][ T298] pppol2tp_release+0x150/0x2b0 [ 22.215609][ T298] sock_close+0xb8/0x200 [ 22.219829][ T298] ? sock_mmap+0xa0/0xa0 [ 22.224046][ T298] __fput+0x2dc/0x730 [ 22.228005][ T298] ____fput+0x15/0x20 [ 22.231958][ T298] task_work_run+0x127/0x190 [ 22.236522][ T298] do_exit+0xa7c/0x24e0 [ 22.240654][ T298] ? __kasan_check_write+0x14/0x20 [ 22.245736][ T298] ? switch_fpu_return+0x19c/0x330 [ 22.250818][ T298] ? put_task_struct+0x90/0x90 [ 22.255579][ T298] ? fpu__clear_all+0x20/0x20 [ 22.260241][ T298] ? __kasan_check_read+0x11/0x20 [ 22.265255][ T298] __x64_sys_exit+0x40/0x40 [ 22.269731][ T298] do_syscall_64+0x31/0x40 [ 22.274138][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 22.280008][ T298] RIP: 0033:0x7fe0adce4d79 [ 22.284395][ T298] Code: Unable to access opcode bytes at RIP 0x7fe0adce4d4f. [ 22.291735][ T298] RSP: 002b:00007ffecf3f16b8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 22.300124][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fe0adce4d79 [ 22.308075][ T298] RDX: 00007fe0adcf6557 RSI: 0000000000000000 RDI: 0000000000000000 [ 22.316024][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 22.323985][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffecf3f18d8 [ 22.331949][ T298] R13: 0000000000000002 R14: 00007fe0add75ca0 R15: 0000000000000002 [ 22.339898][ T298] [ 22.342203][ T298] Allocated by task 297: [ 22.346427][ T298] __kasan_kmalloc+0xd4/0x100 [ 22.351081][ T298] __kmalloc+0x19f/0x330 [ 22.355305][ T298] l2tp_session_create+0x39/0xb60 [ 22.360307][ T298] pppol2tp_connect+0xbf5/0x1640 [ 22.365309][ T298] __sys_connect+0x3ce/0x450 [ 22.369874][ T298] __x64_sys_connect+0x7a/0x90 [ 22.374634][ T298] do_syscall_64+0x31/0x40 [ 22.379046][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 22.384905][ T298] [ 22.387209][ T298] Freed by task 112: [ 22.391099][ T298] kasan_set_track+0x4a/0x70 [ 22.395680][ T298] kasan_set_free_info+0x23/0x40 [ 22.400592][ T298] ____kasan_slab_free+0x125/0x160 [ 22.405679][ T298] __kasan_slab_free+0x11/0x20 [ 22.410415][ T298] slab_free_freelist_hook+0xc5/0x190 [ 22.415761][ T298] kfree+0xc0/0x270 [ 22.419544][ T298] l2tp_session_put+0xb2/0x1a0 [ 22.424281][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 22.429376][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 22.434549][ T298] process_one_work+0x6fd/0xbc0 [ 22.439373][ T298] worker_thread+0xa8e/0x13c0 [ 22.444027][ T298] kthread+0x324/0x3b0 [ 22.448079][ T298] ret_from_fork+0x1f/0x30 [ 22.452475][ T298] [ 22.454782][ T298] The buggy address belongs to the object at ffff8881045fa800 [ 22.454782][ T298] which belongs to the cache kmalloc-512 of size 512 [ 22.468811][ T298] The buggy address is located 0 bytes inside of [ 22.468811][ T298] 512-byte region [ffff8881045fa800, ffff8881045faa00) [ 22.481897][ T298] The buggy address belongs to the page: [ 22.487534][ T298] page:ffffea0004117e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1045f8 [ 22.497743][ T298] head:ffffea0004117e00 order:2 compound_mapcount:0 compound_pincount:0 [ 22.506076][ T298] flags: 0x4000000000010200(slab|head) [ 22.511512][ T298] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 22.520070][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 22.528646][ T298] page dumped because: kasan: bad access detected [ 22.535097][ T298] page_owner tracks the page as allocated [ 22.540796][ 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 21844724616, free_ts 17324295714 [ 22.559777][ T298] prep_new_page+0x176/0x190 [ 22.564340][ T298] get_page_from_freelist+0x225f/0x23f0 [ 22.569865][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 22.575212][ T298] new_slab+0x84/0x3f0 [ 22.579257][ T298] ___slab_alloc+0x2f8/0x4c0 [ 22.583830][ T298] __slab_alloc+0x63/0xa0 [ 22.588238][ T298] __kmalloc_track_caller+0x1e4/0x310 [ 22.593584][ T298] __alloc_skb+0xdc/0x520 [ 22.597889][ T298] alloc_skb_with_frags+0xa3/0x560 [ 22.602976][ T298] sock_alloc_send_pskb+0x87f/0x9a0 [ 22.608155][ T298] unix_stream_sendmsg+0x4c9/0xbe0 [ 22.613240][ T298] sock_write_iter+0x2a6/0x3a0 [ 22.617984][ T298] vfs_write+0x770/0xd70 [ 22.622201][ T298] ksys_write+0x14a/0x260 [ 22.626599][ T298] __x64_sys_write+0x7b/0x90 [ 22.631167][ T298] do_syscall_64+0x31/0x40 [ 22.635568][ T298] page last free stack trace: [ 22.640240][ T298] __free_pages_ok+0x80b/0x830 [ 22.644985][ T298] __free_pages+0xd8/0x390 [ 22.649379][ T298] __free_slab+0xcf/0x190 [ 22.653682][ T298] unfreeze_partials+0x150/0x180 [ 22.658599][ T298] put_cpu_partial+0xc1/0x180 [ 22.663265][ T298] __slab_free+0x2c9/0x3a0 [ 22.667660][ T298] ___cache_free+0x10e/0x130 [ 22.672221][ T298] qlink_free+0x50/0x90 [ 22.676357][ T298] qlist_free_all+0x5f/0xb0 [ 22.680839][ T298] kasan_quarantine_reduce+0x14a/0x160 [ 22.686275][ T298] __kasan_slab_alloc+0x2f/0xe0 [ 22.691100][ T298] slab_post_alloc_hook+0x5d/0x2f0 [ 22.696185][ T298] kmem_cache_alloc+0x15a/0x2d0 [ 22.701011][ T298] __alloc_skb+0x9e/0x520 [ 22.705314][ T298] alloc_skb_with_frags+0xa3/0x560 [ 22.710400][ T298] sock_alloc_send_pskb+0x87f/0x9a0 [ 22.715587][ T298] [ 22.717908][ T298] Memory state around the buggy address: [ 22.723514][ T298] ffff8881045fa700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.731548][ T298] ffff8881045fa780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.739583][ T298] >ffff8881045fa800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.747618][ T298] ^ [ 22.751659][ T298] ffff8881045fa880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.759695][ T298] ffff8881045fa900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.767730][ T298] ================================================================== [ 22.775773][ T298] Disabling lock debugging due to kernel taint [ 22.782255][ T298] ------------[ cut here ]------------ [ 22.785796][ T24] audit: type=1400 audit(1791971831.769:68): 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 [ 22.787770][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 22.819312][ T298] Modules linked in: [ 22.819340][ T24] audit: type=1400 audit(1791971831.769:69): 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 [ 22.823389][ T298] CPU: 0 PID: 298 Comm: syz-executor381 Tainted: G B syzkaller #0 [ 22.844489][ T24] audit: type=1400 audit(1791971831.769:70): 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 [ 22.853783][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 22.874754][ T24] audit: type=1400 audit(1791971831.769:71): 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 [ 22.874769][ T24] audit: type=1400 audit(1791971831.769:72): 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 [ 22.885020][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 22.905231][ T24] audit: type=1400 audit(1791971831.769:73): 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 [ 22.954607][ T298] Code: 5d c3 e8 dc 25 35 fd be 02 00 00 00 eb 0a e8 d0 25 35 fd be 01 00 00 00 4c 89 f7 e8 73 95 0e fe e9 0f ff ff ff e8 b9 25 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 a8 25 35 fd 4c 89 f7 be 03 [ 22.974227][ T298] RSP: 0018:ffffc90000b07c40 EFLAGS: 00010293 [ 22.980302][ T298] RAX: ffffffff842f9107 RBX: ffff888102bd7000 RCX: ffff88810479bc00 [ 22.988280][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 22.996253][ T298] RBP: ffffc90000b07c60 R08: 0000000000000003 R09: 0000000000000004 [ 23.004271][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 23.012229][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881045fa800 [ 23.020221][ T298] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 23.029147][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.035741][ T298] CR2: 00007fe0adcf64f0 CR3: 000000010d4ff000 CR4: 00000000003506b0 [ 23.043715][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.051665][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.059653][ T298] Call Trace: [ 23.062941][ T298] pppol2tp_release+0x150/0x2b0 [ 23.067767][ T298] sock_close+0xb8/0x200 [ 23.071977][ T298] ? sock_mmap+0xa0/0xa0 [ 23.076241][ T298] __fput+0x2dc/0x730 [ 23.080212][ T298] ____fput+0x15/0x20 [ 23.084203][ T298] task_work_run+0x127/0x190 [ 23.088779][ T298] do_exit+0xa7c/0x24e0 [ 23.092939][ T298] ? __kasan_check_write+0x14/0x20 [ 23.098052][ T298] ? switch_fpu_return+0x19c/0x330 [ 23.103193][ T298] ? put_task_struct+0x90/0x90 [ 23.107950][ T298] ? fpu__clear_all+0x20/0x20 [ 23.112600][ T298] ? __kasan_check_read+0x11/0x20 [ 23.117633][ T298] __x64_sys_exit+0x40/0x40 [ 23.122121][ T298] do_syscall_64+0x31/0x40 [ 23.126543][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 23.132429][ T298] RIP: 0033:0x7fe0adce4d79 [ 23.136862][ T298] Code: Unable to access opcode bytes at RIP 0x7fe0adce4d4f. [ 23.144243][ T298] RSP: 002b:00007ffecf3f16b8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 23.152630][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fe0adce4d79 [