ci2-android-5-15/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-15/syz-executor3711453445
<...>
t tclass=process permissive=1
[ 14.474270][ T30] audit: type=1400 audit(1786184183.794:63): avc: denied { siginh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 16.655287][ T230] sshd-session (230) used greatest stack depth: 22824 bytes left
Warning: Permanently added '10.128.0.56' (ED25519) to the list of known hosts.
execve("ci2-android-5-15/syz-executor3711453445", ["ci2-android-5-15/syz-executor3711453445"], 0x7ffc7c125a60 /* 10 vars */) = 0
brk(NULL) = 0x55559353d000
brk(0x55559353dd40) = 0x55559353dd40
arch_prctl(ARCH_SET_FS, 0x55559353d3c0) = 0
set_tid_address(0x55559353d690) = 303
set_robust_list(0x55559353d6a0, 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-5-15/syz-executor3711453445", 4096) = 45
getrandom("\x40\x71\x8a\xb4\xd2\x75\x79\xf2", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55559353dd40
brk(0x55559355ed40) = 0x55559355ed40
brk(0x55559355f000) = 0x55559355f000
mprotect(0x7facbbe1f000, 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
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) = 304
ioctl(3, PPPIOCSFLAGS, 0) = -1 ENOSYS (Function not implemented)
exit_group(0) = ?
+++ exited with 0 +++
[ 24.241543][ T30] audit: type=1400 audit(1786184193.604:64): avc: denied { execmem } for pid=303 comm="syz-executor371" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 24.261411][ T30] audit: type=1400 audit(1786184193.604:65): avc: denied { create } for pid=303 comm="syz-executor371" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.282045][ T30] audit: type=1400 audit(1786184193.604:66): avc: denied { connect } for pid=303 comm="syz-executor371" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.301944][ T30] audit: type=1400 audit(1786184193.624:67): avc: denied { ioctl } for pid=303 comm="syz-executor371" path="socket:[15116]" dev="sockfs" ino=15116 ioctlcmd=0x7459 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.432318][ T304] ==================================================================
[ 24.440398][ T304] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.448460][ T304] Read of size 4 at addr ffff888124b48400 by task syz-executor371/304
[ 24.456602][ T304]
[ 24.458915][ T304] CPU: 1 PID: 304 Comm: syz-executor371 Not tainted syzkaller #0
[ 24.466622][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 24.476676][ T304] Call Trace:
[ 24.479944][ T304]
[ 24.482888][ T304] __dump_stack+0x21/0x30
[ 24.487219][ T304] dump_stack_lvl+0x110/0x170
[ 24.491884][ T304] ? show_regs_print_info+0x20/0x20
[ 24.497422][ T304] ? load_image+0x3f0/0x3f0
[ 24.502043][ T304] ? __local_bh_enable_ip+0x58/0x80
[ 24.507243][ T304] print_address_description+0x7f/0x2c0
[ 24.512785][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.518506][ T304] kasan_report+0x10f/0x150
[ 24.523017][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.528745][ T304] __asan_report_load4_noabort+0x14/0x20
[ 24.534367][ T304] pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.539900][ T304] pppol2tp_release+0x150/0x2b0
[ 24.544737][ T304] sock_close+0xb8/0x200
[ 24.548967][ T304] ? sock_mmap+0xa0/0xa0
[ 24.553199][ T304] __fput+0x22b/0x900
[ 24.557172][ T304] ____fput+0x15/0x20
[ 24.561136][ T304] task_work_run+0x127/0x190
[ 24.565735][ T304] do_exit+0xb70/0x29a0
[ 24.569905][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 24.575609][ T304] ? put_task_struct+0x90/0x90
[ 24.580357][ T304] ? __kasan_check_write+0x14/0x20
[ 24.585453][ T304] __x64_sys_exit+0x40/0x40
[ 24.590121][ T304] x64_sys_call+0x44/0x9a0
[ 24.594538][ T304] do_syscall_64+0x4c/0xa0
[ 24.598945][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.603623][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.608304][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 24.614198][ T304] RIP: 0033:0x7facbbd8ed79
[ 24.618614][ T304] Code: Unable to access opcode bytes at RIP 0x7facbbd8ed4f.
[ 24.625974][ T304] RSP: 002b:00007ffd5f1891f8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 24.634394][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007facbbd8ed79
[ 24.642366][ T304] RDX: 00007facbbda0557 RSI: 0000000000000000 RDI: 0000000000000000
[ 24.650333][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 24.658304][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd5f189418
[ 24.666362][ T304] R13: 0000000000000002 R14: 00007facbbe1fca0 R15: 0000000000000002
[ 24.674332][ T304]
[ 24.677349][ T304]
[ 24.679671][ T304] Allocated by task 303:
[ 24.683914][ T304] __kasan_kmalloc+0xd4/0x100
[ 24.688595][ T304] __kmalloc+0x13d/0x2c0
[ 24.692844][ T304] l2tp_session_create+0x39/0xb60
[ 24.697868][ T304] pppol2tp_connect+0xbf5/0x1640
[ 24.702810][ T304] __sys_connect+0x3cb/0x450
[ 24.707395][ T304] __x64_sys_connect+0x7a/0x90
[ 24.712152][ T304] x64_sys_call+0x7c/0x9a0
[ 24.716676][ T304] do_syscall_64+0x4c/0xa0
[ 24.721099][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 24.726987][ T304]
[ 24.729306][ T304] Freed by task 45:
[ 24.733120][ T304] kasan_set_track+0x4a/0x70
[ 24.737707][ T304] kasan_set_free_info+0x23/0x40
[ 24.742639][ T304] ____kasan_slab_free+0x125/0x160
[ 24.747745][ T304] __kasan_slab_free+0x11/0x20
[ 24.752502][ T304] slab_free_freelist_hook+0xc2/0x190
[ 24.758057][ T304] kfree+0xc4/0x270
[ 24.761874][ T304] l2tp_session_put+0xaf/0x1a0
[ 24.767074][ T304] l2tp_session_delete+0x3a9/0x4a0
[ 24.772355][ T304] l2tp_tunnel_del_work+0x180/0x3d0
[ 24.778000][ T304] process_one_work+0x6c8/0xbb0
[ 24.782860][ T304] worker_thread+0xaa0/0x1250
[ 24.787541][ T304] kthread+0x3f5/0x4f0
[ 24.791783][ T304] ret_from_fork+0x1f/0x30
[ 24.796206][ T304]
[ 24.798523][ T304] The buggy address belongs to the object at ffff888124b48400
[ 24.798523][ T304] which belongs to the cache kmalloc-512 of size 512
[ 24.812664][ T304] The buggy address is located 0 bytes inside of
[ 24.812664][ T304] 512-byte region [ffff888124b48400, ffff888124b48600)
[ 24.825760][ T304] The buggy address belongs to the page:
[ 24.831381][ T304] page:ffffea000492d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x124b48
[ 24.841613][ T304] head:ffffea000492d200 order:2 compound_mapcount:0 compound_pincount:0
[ 24.850030][ T304] flags: 0x4000000000010200(slab|head|zone=1)
[ 24.856101][ T304] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00
[ 24.864842][ T304] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 24.873430][ T304] page dumped because: kasan: bad access detected
[ 24.879855][ T304] page_owner tracks the page as allocated
[ 24.885576][ T304] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 299, ts 24171461563, free_ts 19190652959
[ 24.905110][ T304] post_alloc_hook+0x192/0x1b0
[ 24.909876][ T304] prep_new_page+0x1c/0x110
[ 24.914384][ T304] get_page_from_freelist+0x2c3a/0x2cd0
[ 24.919923][ T304] __alloc_pages+0x1a2/0x460
[ 24.924529][ T304] new_slab+0xa0/0x4d0
[ 24.928625][ T304] ___slab_alloc+0x3ac/0x840
[ 24.933314][ T304] __slab_alloc+0x49/0x90
[ 24.937646][ T304] __kmalloc_track_caller+0x169/0x2c0
[ 24.943106][ T304] __alloc_skb+0x210/0x730
[ 24.947514][ T304] alloc_skb_with_frags+0xa8/0x620
[ 24.952620][ T304] sock_alloc_send_pskb+0x87f/0x9a0
[ 24.957818][ T304] unix_stream_sendmsg+0x428/0xc90
[ 24.962947][ T304] sock_write_iter+0x2a6/0x3a0
[ 24.967712][ T304] vfs_write+0x831/0xfd0
[ 24.971950][ T304] ksys_write+0x14a/0x260
[ 24.976271][ T304] __x64_sys_write+0x7b/0x90
[ 24.980950][ T304] page last free stack trace:
[ 24.985612][ T304] free_unref_page_prepare+0x5fa/0x600
[ 24.991075][ T304] free_unref_page+0xae/0x540
[ 24.995766][ T304] __free_pages+0x6c/0x100
[ 25.000179][ T304] free_pages+0x82/0x90
[ 25.004351][ T304] __stack_depot_save+0x453/0x480
[ 25.009391][ T304] __kasan_slab_alloc+0xc9/0xe0
[ 25.014253][ T304] slab_post_alloc_hook+0x4f/0x2b0
[ 25.019368][ T304] kmem_cache_alloc+0xf7/0x260
[ 25.024131][ T304] __alloc_skb+0xe4/0x730
[ 25.028461][ T304] __neigh_notify+0x84/0x130
[ 25.033049][ T304] neigh_timer_handler+0xa5a/0xe80
[ 25.038155][ T304] call_timer_fn+0x38/0x290
[ 25.042658][ T304] __run_timers+0x637/0x9a0
[ 25.047248][ T304] run_timer_softirq+0x6a/0xf0
[ 25.052011][ T304] handle_softirqs+0x250/0x560
[ 25.056767][ T304] __irq_exit_rcu+0x52/0xf0
[ 25.061267][ T304]
[ 25.063584][ T304] Memory state around the buggy address:
[ 25.069208][ T304] ffff888124b48300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 25.077260][ T304] ffff888124b48380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 25.085313][ T304] >ffff888124b48400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 25.093366][ T304] ^
[ 25.097424][ T304] ffff888124b48480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 25.105485][ T304] ffff888124b48500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 25.113535][ T304] ==================================================================
[ 25.121731][ T304] Disabling lock debugging due to kernel taint
[ 25.128203][ T304] ------------[ cut here ]------------
[ 25.133742][ T30] audit: type=1400 audit(1786184194.484:68): avc: denied { read } for pid=83 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
[ 25.134032][ T304] WARNING: CPU: 1 PID: 304 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0
[ 25.155426][ T30] audit: type=1400 audit(1786184194.484:69): avc: denied { search } for pid=83 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
[ 25.165688][ T304] Modules linked in:
[ 25.186982][ T30] audit: type=1400 audit(1786184194.484:70): avc: denied { write } for pid=83 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
[ 25.191198][ T304] CPU: 1 PID: 304 Comm: syz-executor371 Tainted: G B syzkaller #0
[ 25.212032][ T30] audit: type=1400 audit(1786184194.484:71): avc: denied { add_name } for pid=83 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1
[ 25.221315][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 25.241640][ T30] audit: type=1400 audit(1786184194.484:72): avc: denied { create } for pid=83 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1
[ 25.251911][ T304] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0
[ 25.272459][ T30] audit: type=1400 audit(1786184194.484:73): avc: denied { append open } for pid=83 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
[ 25.279033][ T304] Code: 5d c3 e8 2c 83 0b fd be 02 00 00 00 eb 0a e8 20 83 0b fd be 01 00 00 00 4c 89 f7 e8 33 02 f2 fd e9 0f ff ff ff e8 09 83 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 f8 82 0b fd 4c 89 f7 be 03
[ 25.321525][ T304] RSP: 0018:ffffc900009a7bf0 EFLAGS: 00010293
[ 25.327601][ T304] RAX: ffffffff845e33d7 RBX: ffff888107fb9000 RCX: ffff88811f47cf00
[ 25.335656][ T304] RDX: 0000000000000000 RSI: 00000000249e9b40 RDI: 000000000c04eb7d
[ 25.343673][ T304] RBP: ffffc900009a7c10 R08: 0000000000000003 R09: 0000000000000004
[ 25.351686][ T304] R10: dffffc0000000000 R11: fffffbfff0e18e4c R12: dffffc0000000000
[ 25.359684][ T304] R13: dffffc0000000000 R14: 00000000249e9b40 R15: ffff888124b48400
[ 25.367673][ T304] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
[ 25.376630][ T304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 25.383241][ T304] CR2: 00007facbbddce20 CR3: 000000010c8bb000 CR4: 00000000003506a0
[ 25.391260][ T304] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 25.399218][ T304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 25.407283][ T304] Call Trace:
[ 25.410615][ T304]
[ 25.413555][ T304] pppol2tp_release+0x150/0x2b0
[ 25.418409][ T304] sock_close+0xb8/0x200
[ 25.422663][ T304] ? sock_mmap+0xa0/0xa0
[ 25.426914][ T304] __fput+0x22b/0x900
[ 25.430913][ T304] ____fput+0x15/0x20
[ 25.434936][ T304] task_work_run+0x127/0x190
[ 25.439524][ T304] do_exit+0xb70/0x29a0
[ 25.443777][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 25.449530][ T304] ? put_task_struct+0x90/0x90
[ 25.454344][ T304] ? __kasan_check_write+0x14/0x20
[ 25.459469][ T304] __x64_sys_exit+0x40/0x40
[ 25.464008][ T304] x64_sys_call+0x44/0x9a0
[ 25.468443][ T304] do_syscall_64+0x4c/0xa0
[ 25.472963][ T304] ? clear_bhb_loop+0x50/0xa0
[ 25.477647][ T304] ? clear_bhb_loop+0x50/0xa0
[ 25.482368][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 25.488271][ T304] RIP: 0033:0x7facbbd8ed79
[ 25.493046][ T304] Code: Unable to access opcode bytes at RIP 0x7facbbd8ed4f.
[ 25.500445][ T304] RSP: 002b:00007ffd5f1891f8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 25.509863][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007facbbd8ed79
[ 25.518138][ T304] RDX: 00007facbbda0557 RSI: 0000000000000000 RDI: 0000000000000000
[ 25.526239][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 25.534237][ T304] R10: 0000000