ci2-android-5-15/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-15/syz-executor3077656880
<...>
Warning: Permanently added '10.128.0.108' (ED25519) to the list of known hosts.
execve("ci2-android-5-15/syz-executor3077656880", ["ci2-android-5-15/syz-executor3077656880"], 0x7fffabd21ab0 /* 10 vars */) = 0
brk(NULL) = 0x5555889db000
brk(0x5555889dbd40) = 0x5555889dbd40
arch_prctl(ARCH_SET_FS, 0x5555889db3c0) = 0
set_tid_address(0x5555889db690) = 303
set_robust_list(0x5555889db6a0, 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-executor3077656880", 4096) = 45
getrandom("\xb4\x95\xbc\xbe\xbc\xb5\xf1\x82", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x5555889dbd40
brk(0x5555889fcd40) = 0x5555889fcd40
brk(0x5555889fd000) = 0x5555889fd000
mprotect(0x7fba7f484000, 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
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, PPPIOCGMRU, 0) = -1 ENOSYS (Function not implemented)
exit_group(0) = ?
+++ exited with 0 +++
[ 24.436578][ T30] audit: type=1400 audit(1785793798.942:64): avc: denied { execmem } for pid=303 comm="syz-executor307" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 24.459823][ T30] audit: type=1400 audit(1785793798.952:65): avc: denied { create } for pid=303 comm="syz-executor307" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.481673][ T30] audit: type=1400 audit(1785793798.952:66): avc: denied { connect } for pid=303 comm="syz-executor307" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.503467][ T30] audit: type=1400 audit(1785793798.972:67): avc: denied { ioctl } for pid=303 comm="syz-executor307" path="socket:[14600]" dev="sockfs" ino=14600 ioctlcmd=0x7453 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.632450][ T304] ==================================================================
[ 24.640919][ T304] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.649112][ T304] Read of size 4 at addr ffff888123af6400 by task syz-executor307/304
[ 24.658364][ T304]
[ 24.660699][ T304] CPU: 1 PID: 304 Comm: syz-executor307 Not tainted syzkaller #0
[ 24.668863][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 24.679209][ T304] Call Trace:
[ 24.682520][ T304]
[ 24.685630][ T304] __dump_stack+0x21/0x30
[ 24.690450][ T304] dump_stack_lvl+0x110/0x170
[ 24.695134][ T304] ? show_regs_print_info+0x20/0x20
[ 24.700416][ T304] ? load_image+0x3f0/0x3f0
[ 24.705156][ T304] ? __local_bh_enable_ip+0x58/0x80
[ 24.710529][ T304] print_address_description+0x7f/0x2c0
[ 24.716583][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.723247][ T304] kasan_report+0x10f/0x150
[ 24.728418][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.734436][ T304] __asan_report_load4_noabort+0x14/0x20
[ 24.740758][ T304] pppol2tp_sock_to_session+0x1a0/0x1b0
[ 24.746669][ T304] pppol2tp_release+0x150/0x2b0
[ 24.753537][ T304] sock_close+0xb8/0x200
[ 24.759381][ T304] ? sock_mmap+0xa0/0xa0
[ 24.763841][ T304] __fput+0x22b/0x900
[ 24.767848][ T304] ____fput+0x15/0x20
[ 24.771836][ T304] task_work_run+0x127/0x190
[ 24.776778][ T304] do_exit+0xb70/0x29a0
[ 24.780989][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 24.789102][ T304] ? put_task_struct+0x90/0x90
[ 24.794064][ T304] ? __kasan_check_write+0x14/0x20
[ 24.799290][ T304] __x64_sys_exit+0x40/0x40
[ 24.803824][ T304] x64_sys_call+0x44/0x9a0
[ 24.808332][ T304] do_syscall_64+0x4c/0xa0
[ 24.812782][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.817740][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.822510][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 24.828526][ T304] RIP: 0033:0x7fba7f3f3d79
[ 24.832965][ T304] Code: Unable to access opcode bytes at RIP 0x7fba7f3f3d4f.
[ 24.841369][ T304] RSP: 002b:00007fff4fbc6718 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 24.849988][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fba7f3f3d79
[ 24.858983][ T304] RDX: 00007fba7f405557 RSI: 0000000000000000 RDI: 0000000000000000
[ 24.867106][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 24.875107][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff4fbc6938
[ 24.883927][ T304] R13: 0000000000000002 R14: 00007fba7f484ca0 R15: 0000000000000002
[ 24.892401][ T304]
[ 24.895631][ T304]
[ 24.898073][ T304] Allocated by task 303:
[ 24.902339][ T304] __kasan_kmalloc+0xd4/0x100
[ 24.907041][ T304] __kmalloc+0x13d/0x2c0
[ 24.911325][ T304] l2tp_session_create+0x39/0xb60
[ 24.916423][ T304] pppol2tp_connect+0xbf5/0x1640
[ 24.921933][ T304] __sys_connect+0x3cb/0x450
[ 24.926791][ T304] __x64_sys_connect+0x7a/0x90
[ 24.931923][ T304] x64_sys_call+0x7c/0x9a0
[ 24.936340][ T304] do_syscall_64+0x4c/0xa0
[ 24.940840][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 24.946741][ T304]
[ 24.949260][ T304] Freed by task 45:
[ 24.953377][ T304] kasan_set_track+0x4a/0x70
[ 24.958000][ T304] kasan_set_free_info+0x23/0x40
[ 24.962953][ T304] ____kasan_slab_free+0x125/0x160
[ 24.968151][ T304] __kasan_slab_free+0x11/0x20
[ 24.972913][ T304] slab_free_freelist_hook+0xc2/0x190
[ 24.978308][ T304] kfree+0xc4/0x270
[ 24.982418][ T304] l2tp_session_put+0xaf/0x1a0
[ 24.987546][ T304] l2tp_session_delete+0x3a9/0x4a0
[ 24.992972][ T304] l2tp_tunnel_del_work+0x180/0x3d0
[ 24.998802][ T304] process_one_work+0x6c8/0xbb0
[ 25.003793][ T304] worker_thread+0xaa0/0x1250
[ 25.008507][ T304] kthread+0x3f5/0x4f0
[ 25.012609][ T304] ret_from_fork+0x1f/0x30
[ 25.018635][ T304]
[ 25.021330][ T304] The buggy address belongs to the object at ffff888123af6400
[ 25.021330][ T304] which belongs to the cache kmalloc-512 of size 512
[ 25.035507][ T304] The buggy address is located 0 bytes inside of
[ 25.035507][ T304] 512-byte region [ffff888123af6400, ffff888123af6600)
[ 25.048951][ T304] The buggy address belongs to the page:
[ 25.056435][ T304] page:ffffea00048ebd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123af4
[ 25.067163][ T304] head:ffffea00048ebd00 order:2 compound_mapcount:0 compound_pincount:0
[ 25.075685][ T304] flags: 0x4000000000010200(slab|head|zone=1)
[ 25.081885][ T304] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00
[ 25.092721][ T304] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 25.101946][ T304] page dumped because: kasan: bad access detected
[ 25.109543][ T304] page_owner tracks the page as allocated
[ 25.115437][ 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 193, ts 24287489194, free_ts 0
[ 25.136974][ T304] post_alloc_hook+0x192/0x1b0
[ 25.141847][ T304] prep_new_page+0x1c/0x110
[ 25.146963][ T304] get_page_from_freelist+0x2c3a/0x2cd0
[ 25.154327][ T304] __alloc_pages+0x1a2/0x460
[ 25.160772][ T304] new_slab+0xa0/0x4d0
[ 25.165049][ T304] ___slab_alloc+0x3ac/0x840
[ 25.170119][ T304] __slab_alloc+0x49/0x90
[ 25.175008][ T304] __kmalloc_track_caller+0x169/0x2c0
[ 25.180429][ T304] __alloc_skb+0x210/0x730
[ 25.185271][ T304] alloc_skb_with_frags+0xa8/0x620
[ 25.191790][ T304] sock_alloc_send_pskb+0x87f/0x9a0
[ 25.197471][ T304] unix_stream_sendmsg+0x428/0xc90
[ 25.202713][ T304] sock_write_iter+0x2a6/0x3a0
[ 25.207824][ T304] vfs_write+0x831/0xfd0
[ 25.212298][ T304] ksys_write+0x14a/0x260
[ 25.217488][ T304] __x64_sys_write+0x7b/0x90
[ 25.223381][ T304] page_owner free stack trace missing
[ 25.229352][ T304]
[ 25.231715][ T304] Memory state around the buggy address:
[ 25.237463][ T304] ffff888123af6300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 25.246041][ T304] ffff888123af6380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 25.256289][ T304] >ffff888123af6400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 25.264914][ T304] ^
[ 25.269000][ T304] ffff888123af6480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 25.277610][ T304] ffff888123af6500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 25.286401][ T304] ==================================================================
[ 25.295312][ T304] Disabling lock debugging due to kernel taint
[ 25.305958][ T304] ------------[ cut here ]------------
[ 25.314800][ T30] audit: type=1400 audit(1785793799.822:68): 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
[ 25.314859][ T304] WARNING: CPU: 0 PID: 304 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0
[ 25.342384][ T304] Modules linked in:
[ 25.363617][ T304] CPU: 0 PID: 304 Comm: syz-executor307 Tainted: G B syzkaller #0
[ 25.376213][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 25.400268][ T304] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0
[ 25.411309][ T304] Code: 5d c3 e8 9c 83 0b fd be 02 00 00 00 eb 0a e8 90 83 0b fd be 01 00 00 00 4c 89 f7 e8 33 02 f2 fd e9 0f ff ff ff e8 79 83 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 68 83 0b fd 4c 89 f7 be 03
[ 25.411604][ T30] audit: type=1400 audit(1785793799.822:69): 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
[ 25.447333][ T304] RSP: 0018:ffffc90000997bf0 EFLAGS: 00010293
[ 25.447362][ T304] RAX: ffffffff845e3367 RBX: ffff888107fdc000 RCX: ffff8881213ee2c0
[ 25.521346][ T30] audit: type=1400 audit(1785793799.822:70): 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
[ 25.525315][ T304] RDX: 0000000000000000 RSI: 000000000b040000 RDI: 000000000c04eb7d
[ 25.548302][ T30] audit: type=1400 audit(1785793799.822:71): 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
[ 25.564151][ T304] RBP: ffffc90000997c10 R08: 0000000000000003 R09: 0000000000000004
[ 25.581114][ T30] audit: type=1400 audit(1785793799.822:72): 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
[ 25.589429][ T304] R10: dffffc0000000000 R11: fffffbfff0e18e4c R12: dffffc0000000000
[ 25.611751][ T30] audit: type=1400 audit(1785793799.822:73): 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
[ 25.627323][ T304] R13: dffffc0000000000 R14: 000000000b040000 R15: ffff888123af6400
[ 25.656890][ T304] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
[ 25.667768][ T304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 25.675762][ T304] CR2: 00000000006aa5b0 CR3: 000000010cb86000 CR4: 00000000003506b0
[ 25.685114][ T304] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 25.694684][ T304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 25.703135][ T304] Call Trace:
[ 25.706666][ T304]
[ 25.710511][ T304] pppol2tp_release+0x150/0x2b0
[ 25.718009][ T304] sock_close+0xb8/0x200
[ 25.724772][ T304] ? sock_mmap+0xa0/0xa0
[ 25.729566][ T304] __fput+0x22b/0x900
[ 25.733992][ T304] ____fput+0x15/0x20
[ 25.738388][ T304] task_work_run+0x127/0x190
[ 25.744505][ T304] do_exit+0xb70/0x29a0
[ 25.749441][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 25.757317][ T304] ? put_task_struct+0x90/0x90
[ 25.762177][ T304] ? __kasan_check_write+0x14/0x20
[ 25.767837][ T304] __x64_sys_exit+0x40/0x40
[ 25.772503][ T304] x64_sys_call+0x44/0x9a0
[ 25.777172][ T304] do_syscall_64+0x4c/0xa0
[ 25.782144][ T304] ? clear_bhb_loop+0x50/0xa0
[ 25.788623][ T304] ? clear_bhb_loop+0x50/0xa0
[ 25.794345][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 25.800763][ T304] RIP: 0033:0x7fba7f3f3d79
[ 25.805559][ T304] Code: Unable to access opcode bytes at RIP 0x7fba7f3f3d4f.
[ 25.813607][ T304] RSP: 002b:00007fff4fbc6718 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 25.825420][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fba7f3f3d79
[ 25.834533][ T304] RDX: 00007fba7f405557 RSI: