ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1726115931 <...> Warning: Permanently added '10.128.0.29' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1726115931", ["ci2-android-5-10/syz-executor1726115931"], 0x7ffe0a72cc10 /* 10 vars */) = 0 brk(NULL) = 0x555571442000 brk(0x555571442d40) = 0x555571442d40 arch_prctl(ARCH_SET_FS, 0x5555714423c0) = 0 set_tid_address(0x555571442690) = 297 set_robust_list(0x5555714426a0, 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-executor1726115931", 4096) = 45 getrandom("\xc3\x94\x0c\xac\x23\xa6\x0b\x46", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555571442d40 brk(0x555571463d40) = 0x555571463d40 brk(0x555571464000) = 0x555571464000 mprotect(0x7f70b8e8d000, 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 +++ [ 26.601878][ T24] audit: type=1400 audit(1789462233.120:64): avc: denied { execmem } for pid=297 comm="syz-executor172" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 26.621540][ T24] audit: type=1400 audit(1789462233.130:65): avc: denied { create } for pid=297 comm="syz-executor172" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.641875][ T24] audit: type=1400 audit(1789462233.140:66): avc: denied { connect } for pid=297 comm="syz-executor172" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.661796][ T24] audit: type=1400 audit(1789462233.150:67): avc: denied { ioctl } for pid=297 comm="syz-executor172" path="socket:[14526]" dev="sockfs" ino=14526 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.792762][ T298] ================================================================== [ 26.801159][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.809228][ T298] Read of size 4 at addr ffff88810b2c3800 by task syz-executor172/298 [ 26.817558][ T298] [ 26.819923][ T298] CPU: 1 PID: 298 Comm: syz-executor172 Not tainted syzkaller #0 [ 26.827670][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026 [ 26.838151][ T298] Call Trace: [ 26.841470][ T298] __dump_stack+0x21/0x24 [ 26.845812][ T298] dump_stack_lvl+0x1a7/0x208 [ 26.850630][ T298] ? show_regs_print_info+0x18/0x18 [ 26.855836][ T298] ? thaw_kernel_threads+0x220/0x220 [ 26.861431][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 26.866647][ T298] print_address_description+0x7f/0x2c0 [ 26.872202][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.877951][ T298] kasan_report+0x100/0x140 [ 26.882480][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.888213][ T298] __asan_report_load4_noabort+0x14/0x20 [ 26.893856][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.899414][ T298] pppol2tp_release+0x150/0x2b0 [ 26.904280][ T298] sock_close+0xb8/0x200 [ 26.908543][ T298] ? sock_mmap+0xa0/0xa0 [ 26.912796][ T298] __fput+0x2dc/0x730 [ 26.917065][ T298] ____fput+0x15/0x20 [ 26.921204][ T298] task_work_run+0x127/0x190 [ 26.925844][ T298] do_exit+0xa7c/0x24e0 [ 26.930042][ T298] ? __kasan_check_write+0x14/0x20 [ 26.935164][ T298] ? switch_fpu_return+0x19c/0x330 [ 26.940309][ T298] ? put_task_struct+0x90/0x90 [ 26.945125][ T298] ? fpu__clear_all+0x20/0x20 [ 26.949810][ T298] ? __kasan_check_read+0x11/0x20 [ 26.954849][ T298] __x64_sys_exit+0x40/0x40 [ 26.959355][ T298] do_syscall_64+0x31/0x40 [ 26.963802][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.969701][ T298] RIP: 0033:0x7f70b8dfcd79 [ 26.974218][ T298] Code: Unable to access opcode bytes at RIP 0x7f70b8dfcd4f. [ 26.981602][ T298] RSP: 002b:00007ffe600f65f8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.990043][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f70b8dfcd79 [ 26.998021][ T298] RDX: 00007f70b8e0e557 RSI: 0000000000000000 RDI: 0000000000000000 [ 27.006087][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 27.014095][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe600f6818 [ 27.022074][ T298] R13: 0000000000000002 R14: 00007f70b8e8dca0 R15: 0000000000000002 [ 27.030055][ T298] [ 27.032388][ T298] Allocated by task 297: [ 27.036652][ T298] __kasan_kmalloc+0xd4/0x100 [ 27.041340][ T298] __kmalloc+0x19f/0x330 [ 27.045587][ T298] l2tp_session_create+0x39/0xb60 [ 27.050620][ T298] pppol2tp_connect+0xbf5/0x1640 [ 27.055570][ T298] __sys_connect+0x3ce/0x450 [ 27.060168][ T298] __x64_sys_connect+0x7a/0x90 [ 27.064960][ T298] do_syscall_64+0x31/0x40 [ 27.069388][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.075280][ T298] [ 27.077620][ T298] Freed by task 49: [ 27.081461][ T298] kasan_set_track+0x4a/0x70 [ 27.086262][ T298] kasan_set_free_info+0x23/0x40 [ 27.091208][ T298] ____kasan_slab_free+0x125/0x160 [ 27.096330][ T298] __kasan_slab_free+0x11/0x20 [ 27.101106][ T298] slab_free_freelist_hook+0xc5/0x190 [ 27.106489][ T298] kfree+0xc0/0x270 [ 27.110308][ T298] l2tp_session_put+0xb2/0x1a0 [ 27.115078][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 27.120214][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 27.125427][ T298] process_one_work+0x6fd/0xbc0 [ 27.130375][ T298] worker_thread+0xa8e/0x13c0 [ 27.135115][ T298] kthread+0x324/0x3b0 [ 27.139281][ T298] ret_from_fork+0x1f/0x30 [ 27.143839][ T298] [ 27.146171][ T298] Last potentially related work creation: [ 27.151896][ T298] kasan_save_stack+0x3a/0x60 [ 27.156580][ T298] __kasan_record_aux_stack+0xd2/0x100 [ 27.162047][ T298] kasan_record_aux_stack_noalloc+0xb/0x10 [ 27.167863][ T298] call_rcu+0x11a/0x1090 [ 27.172112][ T298] blkg_release+0x23/0x30 [ 27.176459][ T298] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 27.182623][ T298] rcu_do_batch+0x488/0xaf0 [ 27.187150][ T298] rcu_core+0x50a/0xca0 [ 27.191319][ T298] rcu_core_si+0x9/0x10 [ 27.195490][ T298] __do_softirq+0x255/0x563 [ 27.199997][ T298] [ 27.202343][ T298] The buggy address belongs to the object at ffff88810b2c3800 [ 27.202343][ T298] which belongs to the cache kmalloc-512 of size 512 [ 27.216410][ T298] The buggy address is located 0 bytes inside of [ 27.216410][ T298] 512-byte region [ffff88810b2c3800, ffff88810b2c3a00) [ 27.229513][ T298] The buggy address belongs to the page: [ 27.235179][ T298] page:ffffea00042cb000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b2c0 [ 27.245419][ T298] head:ffffea00042cb000 order:2 compound_mapcount:0 compound_pincount:0 [ 27.253786][ T298] flags: 0x4000000000010200(slab|head) [ 27.259262][ T298] raw: 4000000000010200 ffffea00042c6300 0000000400000004 ffff888100043080 [ 27.267854][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 27.276460][ T298] page dumped because: kasan: bad access detected [ 27.282876][ T298] page_owner tracks the page as allocated [ 27.288623][ 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 1, ts 2724791416, free_ts 0 [ 27.306595][ T298] prep_new_page+0x176/0x190 [ 27.311205][ T298] get_page_from_freelist+0x225f/0x23f0 [ 27.316763][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 27.322142][ T298] new_slab+0x84/0x3f0 [ 27.326349][ T298] ___slab_alloc+0x2f8/0x4c0 [ 27.330982][ T298] __slab_alloc+0x63/0xa0 [ 27.335334][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 27.340755][ T298] blkg_alloc+0x6d/0x570 [ 27.345045][ T298] blkcg_init_queue+0x2d/0x330 [ 27.349847][ T298] blk_alloc_queue+0x444/0x5f0 [ 27.354622][ T298] blk_mq_init_queue+0x37/0xd0 [ 27.359397][ T298] scsi_mq_alloc_queue+0x42/0x140 [ 27.364521][ T298] scsi_alloc_sdev+0x611/0x920 [ 27.369315][ T298] scsi_probe_and_add_lun+0x17d/0x3370 [ 27.374802][ T298] __scsi_scan_target+0x1d2/0xbf0 [ 27.379839][ T298] scsi_scan_host_selected+0x34e/0x600 [ 27.385296][ T298] page_owner free stack trace missing [ 27.390673][ T298] [ 27.393004][ T298] Memory state around the buggy address: [ 27.398642][ T298] ffff88810b2c3700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.406815][ T298] ffff88810b2c3780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.414888][ T298] >ffff88810b2c3800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.422953][ T298] ^ [ 27.427260][ T298] ffff88810b2c3880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.435335][ T298] ffff88810b2c3900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.443397][ T298] ================================================================== [ 27.451480][ T298] Disabling lock debugging due to kernel taint [ 27.457936][ T298] ------------[ cut here ]------------ [ 27.463474][ T298] WARNING: CPU: 1 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 27.473713][ T24] audit: type=1400 audit(1789462233.990:68): 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 [ 27.495558][ T298] Modules linked in: [ 27.495661][ T24] audit: type=1400 audit(1789462233.990:69): 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 [ 27.499517][ T298] CPU: 1 PID: 298 Comm: syz-executor172 Tainted: G B syzkaller #0 [ 27.521337][ T24] audit: type=1400 audit(1789462233.990:70): 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 [ 27.529880][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026 [ 27.529951][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 27.552102][ T24] audit: type=1400 audit(1789462233.990:71): 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 [ 27.561551][ T298] Code: 5d c3 e8 2c 5a 35 fd be 02 00 00 00 eb 0a e8 20 5a 35 fd be 01 00 00 00 4c 89 f7 e8 63 ca 0e fe e9 0f ff ff ff e8 09 5a 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 f8 59 35 fd 4c 89 f7 be 03 [ 27.568337][ T24] audit: type=1400 audit(1789462233.990:72): 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 [ 27.588531][ T298] RSP: 0018:ffffc90000b97c40 EFLAGS: 00010293 [ 27.608609][ T24] audit: type=1400 audit(1789462233.990:73): 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 [ 27.628870][ T298] [ 27.660078][ T298] RAX: ffffffff842f5aa7 RBX: ffff88811dcc5800 RCX: ffff88811edc1400 [ 27.668124][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 27.676303][ T298] RBP: ffffc90000b97c60 R08: 0000000000000003 R09: 0000000000000004 [ 27.684347][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 27.692443][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810b2c3800 [ 27.701171][ T298] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 27.710522][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.717278][ T298] CR2: 00007f70b8e0e4f0 CR3: 000000000640f000 CR4: 00000000003506a0 [ 27.725310][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.733290][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.741326][ T298] Call Trace: [ 27.744650][ T298] pppol2tp_release+0x150/0x2b0 [ 27.749508][ T298] sock_close+0xb8/0x200 [ 27.753757][ T298] ? sock_mmap+0xa0/0xa0 [ 27.758102][ T298] __fput+0x2dc/0x730 [ 27.762121][ T298] ____fput+0x15/0x20 [ 27.766179][ T298] task_work_run+0x127/0x190 [ 27.770942][ T298] do_exit+0xa7c/0x24e0 [ 27.775172][ T298] ? __kasan_check_write+0x14/0x20 [ 27.780316][ T298] ? switch_fpu_return+0x19c/0x330 [ 27.785491][ T298] ? put_task_struct+0x90/0x90 [ 27.790522][ T298] ? fpu__clear_all+0x20/0x20 [ 27.795285][ T298] ? __kasan_check_read+0x11/0x20 [ 27.800347][ T298] __x64_sys_exit+0x40/0x40 [ 27.804914][ T298] do_syscall_64+0x31/0x40 [ 27.809367][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.815319][ T298] RIP: 0033:0x7f70b8dfcd79 [ 27.819865][ T298] Code: Unable to access opcode bytes at RIP 0x7f70b8dfcd4f. [ 27.827494][ T298] RSP: 002b:00007ffe600f65f8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 27.836038][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f70b8dfcd79 [ 27.844030][ T298] RDX: 00007f70b8