ci2-android-5-15/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-15/syz-executor309866843
<...>
Warning: Permanently added '10.128.1.161' (ED25519) to the list of known hosts.
execve("ci2-android-5-15/syz-executor309866843", ["ci2-android-5-15/syz-executor309866843"], 0x7ffefd6e7060 /* 10 vars */) = 0
brk(NULL) = 0x55558c462000
brk(0x55558c462d40) = 0x55558c462d40
arch_prctl(ARCH_SET_FS, 0x55558c4623c0) = 0
set_tid_address(0x55558c462690) = 303
set_robust_list(0x55558c4626a0, 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-executor309866843", 4096) = 44
getrandom("\x64\x58\x6d\xa5\x0d\xd7\x31\xc9", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55558c462d40
brk(0x55558c483d40) = 0x55558c483d40
brk(0x55558c484000) = 0x55558c484000
mprotect(0x7f0eec0d6000, 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\x04\x00\x00\x00\x00\x20\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\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 +++
[ 22.872866][ T30] audit: type=1400 audit(1786701214.565:64): avc: denied { execmem } for pid=303 comm="syz-executor309" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 22.892966][ T30] audit: type=1400 audit(1786701214.565:65): avc: denied { create } for pid=303 comm="syz-executor309" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 22.913913][ T30] audit: type=1400 audit(1786701214.565:66): avc: denied { connect } for pid=303 comm="syz-executor309" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 22.935808][ T30] audit: type=1400 audit(1786701214.585:67): avc: denied { ioctl } for pid=303 comm="syz-executor309" path="socket:[14701]" dev="sockfs" ino=14701 ioctlcmd=0x7453 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 23.064322][ T304] ==================================================================
[ 23.072437][ T304] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.080966][ T304] Read of size 4 at addr ffff88810abde000 by task syz-executor309/304
[ 23.089119][ T304]
[ 23.091452][ T304] CPU: 0 PID: 304 Comm: syz-executor309 Not tainted syzkaller #0
[ 23.099555][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 23.109707][ T304] Call Trace:
[ 23.113046][ T304]
[ 23.116108][ T304] __dump_stack+0x21/0x30
[ 23.120992][ T304] dump_stack_lvl+0x110/0x170
[ 23.125653][ T304] ? show_regs_print_info+0x20/0x20
[ 23.130836][ T304] ? load_image+0x3f0/0x3f0
[ 23.135327][ T304] ? __local_bh_enable_ip+0x58/0x80
[ 23.140497][ T304] print_address_description+0x7f/0x2c0
[ 23.146040][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.151753][ T304] kasan_report+0x10f/0x150
[ 23.156838][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.162572][ T304] __asan_report_load4_noabort+0x14/0x20
[ 23.168284][ T304] pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.173899][ T304] pppol2tp_release+0x150/0x2b0
[ 23.179309][ T304] sock_close+0xb8/0x200
[ 23.183741][ T304] ? sock_mmap+0xa0/0xa0
[ 23.187993][ T304] __fput+0x22b/0x900
[ 23.191971][ T304] ____fput+0x15/0x20
[ 23.195965][ T304] task_work_run+0x127/0x190
[ 23.200725][ T304] do_exit+0xb70/0x29a0
[ 23.204872][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 23.210964][ T304] ? put_task_struct+0x90/0x90
[ 23.215846][ T304] ? __kasan_check_write+0x14/0x20
[ 23.220979][ T304] __x64_sys_exit+0x40/0x40
[ 23.225473][ T304] x64_sys_call+0x44/0x9a0
[ 23.229966][ T304] do_syscall_64+0x4c/0xa0
[ 23.234907][ T304] ? clear_bhb_loop+0x50/0xa0
[ 23.239844][ T304] ? clear_bhb_loop+0x50/0xa0
[ 23.244543][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 23.250827][ T304] RIP: 0033:0x7f0eec045d79
[ 23.255760][ T304] Code: Unable to access opcode bytes at RIP 0x7f0eec045d4f.
[ 23.263776][ T304] RSP: 002b:00007fffa5b7bed8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 23.272489][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f0eec045d79
[ 23.280977][ T304] RDX: 00007f0eec057557 RSI: 0000000000000000 RDI: 0000000000000000
[ 23.288945][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 23.297003][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa5b7c0f8
[ 23.305167][ T304] R13: 0000000000000002 R14: 00007f0eec0d6ca0 R15: 0000000000000002
[ 23.313944][ T304]
[ 23.316983][ T304]
[ 23.319321][ T304] Allocated by task 303:
[ 23.323807][ T304] __kasan_kmalloc+0xd4/0x100
[ 23.328718][ T304] __kmalloc+0x13d/0x2c0
[ 23.333182][ T304] l2tp_session_create+0x39/0xb60
[ 23.338205][ T304] pppol2tp_connect+0xbf5/0x1640
[ 23.343215][ T304] __sys_connect+0x3cb/0x450
[ 23.347795][ T304] __x64_sys_connect+0x7a/0x90
[ 23.352608][ T304] x64_sys_call+0x7c/0x9a0
[ 23.357022][ T304] do_syscall_64+0x4c/0xa0
[ 23.361428][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 23.367311][ T304]
[ 23.369624][ T304] Freed by task 45:
[ 23.373418][ T304] kasan_set_track+0x4a/0x70
[ 23.377996][ T304] kasan_set_free_info+0x23/0x40
[ 23.383020][ T304] ____kasan_slab_free+0x125/0x160
[ 23.388115][ T304] __kasan_slab_free+0x11/0x20
[ 23.393231][ T304] slab_free_freelist_hook+0xc2/0x190
[ 23.398582][ T304] kfree+0xc4/0x270
[ 23.402630][ T304] l2tp_session_put+0xaf/0x1a0
[ 23.407634][ T304] l2tp_session_delete+0x3a9/0x4a0
[ 23.412741][ T304] l2tp_tunnel_del_work+0x180/0x3d0
[ 23.417940][ T304] process_one_work+0x6c8/0xbb0
[ 23.422976][ T304] worker_thread+0xaa0/0x1250
[ 23.427849][ T304] kthread+0x3f5/0x4f0
[ 23.432080][ T304] ret_from_fork+0x1f/0x30
[ 23.436507][ T304]
[ 23.438828][ T304] Last potentially related work creation:
[ 23.444525][ T304] kasan_save_stack+0x3a/0x60
[ 23.449211][ T304] __kasan_record_aux_stack+0xd2/0x100
[ 23.454690][ T304] kasan_record_aux_stack_noalloc+0xb/0x10
[ 23.460491][ T304] call_rcu+0x10b/0xf60
[ 23.464647][ T304] blkg_release+0x23/0x30
[ 23.469008][ T304] percpu_ref_switch_to_atomic_rcu+0x611/0x620
[ 23.475262][ T304] rcu_do_batch+0x4c1/0xbf0
[ 23.479787][ T304] rcu_core+0x4a3/0xef0
[ 23.483932][ T304] rcu_core_si+0x9/0x10
[ 23.488066][ T304] handle_softirqs+0x250/0x560
[ 23.492807][ T304] run_ksoftirqd+0x28/0x40
[ 23.497215][ T304] smpboot_thread_fn+0x446/0x880
[ 23.502339][ T304] kthread+0x3f5/0x4f0
[ 23.506535][ T304] ret_from_fork+0x1f/0x30
[ 23.511067][ T304]
[ 23.513530][ T304] The buggy address belongs to the object at ffff88810abde000
[ 23.513530][ T304] which belongs to the cache kmalloc-512 of size 512
[ 23.529385][ T304] The buggy address is located 0 bytes inside of
[ 23.529385][ T304] 512-byte region [ffff88810abde000, ffff88810abde200)
[ 23.543609][ T304] The buggy address belongs to the page:
[ 23.549229][ T304] page:ffffea00042af700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10abdc
[ 23.559451][ T304] head:ffffea00042af700 order:2 compound_mapcount:0 compound_pincount:0
[ 23.567985][ T304] flags: 0x4000000000010200(slab|head|zone=1)
[ 23.574204][ T304] raw: 4000000000010200 ffffea00042af600 0000000200000002 ffff888100042f00
[ 23.582859][ T304] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 23.591782][ T304] page dumped because: kasan: bad access detected
[ 23.598631][ T304] page_owner tracks the page as allocated
[ 23.604556][ 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 1, ts 2154777212, free_ts 0
[ 23.622617][ T304] post_alloc_hook+0x192/0x1b0
[ 23.627466][ T304] prep_new_page+0x1c/0x110
[ 23.631966][ T304] get_page_from_freelist+0x2c3a/0x2cd0
[ 23.637623][ T304] __alloc_pages+0x1a2/0x460
[ 23.642234][ T304] new_slab+0xa0/0x4d0
[ 23.646668][ T304] ___slab_alloc+0x3ac/0x840
[ 23.651602][ T304] __slab_alloc+0x49/0x90
[ 23.656307][ T304] kmem_cache_alloc_trace+0x146/0x270
[ 23.662186][ T304] blkg_alloc+0x82/0x5d0
[ 23.666706][ T304] blkcg_init_queue+0x29/0x210
[ 23.671465][ T304] blk_alloc_queue+0x3be/0x550
[ 23.676326][ T304] blk_mq_init_queue+0x37/0xd0
[ 23.681435][ T304] scsi_alloc_sdev+0x66c/0x9c0
[ 23.686902][ T304] scsi_probe_and_add_lun+0x180/0x35d0
[ 23.692371][ T304] __scsi_scan_target+0x1d2/0xb70
[ 23.697885][ T304] scsi_scan_host_selected+0x34e/0x600
[ 23.703433][ T304] page_owner free stack trace missing
[ 23.708799][ T304]
[ 23.711114][ T304] Memory state around the buggy address:
[ 23.716730][ T304] ffff88810abddf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 23.725001][ T304] ffff88810abddf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 23.733129][ T304] >ffff88810abde000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.741566][ T304] ^
[ 23.745750][ T304] ffff88810abde080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.754606][ T304] ffff88810abde100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.762973][ T304] ==================================================================
[ 23.771583][ T304] Disabling lock debugging due to kernel taint
[ 23.778453][ T304] ------------[ cut here ]------------
[ 23.784546][ T304] WARNING: CPU: 0 PID: 304 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0
[ 23.788162][ T30] audit: type=1400 audit(1786701215.475:68): 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
[ 23.794579][ T304] Modules linked in:
[ 23.794592][ T304] CPU: 0 PID: 304 Comm: syz-executor309 Tainted: G B syzkaller #0
[ 23.817805][ T30] audit: type=1400 audit(1786701215.475:69): 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
[ 23.820592][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 23.829769][ T30] audit: type=1400 audit(1786701215.475:70): 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
[ 23.850813][ T304] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0
[ 23.861634][ T30] audit: type=1400 audit(1786701215.475:71): 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
[ 23.882429][ 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
[ 23.888960][ T30] audit: type=1400 audit(1786701215.475:72): 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
[ 23.909177][ T304] RSP: 0018:ffffc900007cfbf0 EFLAGS: 00010293
[ 23.909201][ T304] RAX: ffffffff845e33d7 RBX: ffff888107fbc000 RCX: ffff88810af993c0
[ 23.929306][ T30] audit: type=1400 audit(1786701215.475:73): 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
[ 23.949904][ T304] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d
[ 23.995436][ T304] RBP: ffffc900007cfc10 R08: 0000000000000003 R09: 0000000000000004
[ 24.003557][ T304] R10: dffffc0000000000 R11: fffffbfff0e18e4c R12: dffffc0000000000
[ 24.011665][ T304] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810abde000
[ 24.019710][ T304] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
[ 24.029231][ T304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 24.035847][ T304] CR2: 00007f0eec0574f0 CR3: 000000010d6e8000 CR4: 00000000003506b0
[ 24.043826][ T304] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 24.051925][ T304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 24.059889][ T304] Call Trace:
[ 24.063313][ T304]
[ 24.066242][ T304] pppol2tp_release+0x150/0x2b0
[ 24.071202][ T304] sock_close+0xb8/0x200
[ 24.075444][ T304] ? sock_mmap+0xa0/0xa0
[ 24.079671][ T304] __fput+0x22b/0x900
[ 24.083670][ T304] ____fput+0x15/0x20
[ 24.087646][ T304] task_work_run+0x127/0x190
[ 24.092254][ T304] do_exit+0xb70/0x29a0
[ 24.096403][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 24.102138][ T304] ? put_task_struct+0x90/0x90
[ 24.107047][ T304] ? __kasan_check_write+0x14/0x20
[ 24.112209][ T304] __x64_sys_exit+0x40/0x40
[ 24.116712][ T304] x64_sys_call+0x44/0x9a0
[ 24.121177][ T304] do_syscall_64+0x4c/0xa0
[ 24.125730][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.130477][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.135184][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 24.141094][ T304] RIP: 0033:0x7f0eec045d79
[ 24.145522][ T304] Code: Unable to access opcode bytes at RIP 0x7f0eec045d4f.
[ 24.153032][ T304] RSP: 002b:00007fffa5b7bed8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 24.161501][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f0ee