ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2733239258 <...> Warning: Permanently added '10.128.0.224' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2733239258", ["ci2-android-5-10/syz-executor2733239258"], 0x7fff6220e850 /* 10 vars */) = 0 brk(NULL) = 0x555573b63000 brk(0x555573b63d40) = 0x555573b63d40 arch_prctl(ARCH_SET_FS, 0x555573b633c0) = 0 set_tid_address(0x555573b63690) = 297 set_robust_list(0x555573b636a0, 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-executor2733239258", 4096) = 45 getrandom("\x42\xcb\xef\xc7\x0e\xb8\x87\x0e", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555573b63d40 brk(0x555573b84d40) = 0x555573b84d40 brk(0x555573b85000) = 0x555573b85000 mprotect(0x7f17ee9ca000, 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) = 298 ioctl(3, PPPIOCSMRU, 0) = -1 ENOSYS (Function not implemented) exit_group(0) = ? +++ exited with 0 +++ [ 24.631193][ T24] audit: type=1400 audit(1792371454.300:64): avc: denied { execmem } for pid=297 comm="syz-executor273" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.651137][ T24] audit: type=1400 audit(1792371454.300:65): avc: denied { create } for pid=297 comm="syz-executor273" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.671962][ T24] audit: type=1400 audit(1792371454.300:66): avc: denied { connect } for pid=297 comm="syz-executor273" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.692001][ T24] audit: type=1400 audit(1792371454.330:67): avc: denied { ioctl } for pid=297 comm="syz-executor273" path="socket:[14452]" dev="sockfs" ino=14452 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.822947][ T298] ================================================================== [ 24.831083][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.839229][ T298] Read of size 4 at addr ffff8881095fe800 by task syz-executor273/298 [ 24.847376][ T298] [ 24.849712][ T298] CPU: 0 PID: 298 Comm: syz-executor273 Not tainted syzkaller #0 [ 24.857421][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 24.867683][ T298] Call Trace: [ 24.870991][ T298] __dump_stack+0x21/0x24 [ 24.875502][ T298] dump_stack_lvl+0x1a7/0x208 [ 24.880181][ T298] ? show_regs_print_info+0x18/0x18 [ 24.885553][ T298] ? thaw_kernel_threads+0x220/0x220 [ 24.890851][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 24.896054][ T298] print_address_description+0x7f/0x2c0 [ 24.901611][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.907326][ T298] kasan_report+0x100/0x140 [ 24.911827][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.919317][ T298] __asan_report_load4_noabort+0x14/0x20 [ 24.924978][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.930526][ T298] pppol2tp_release+0x150/0x2b0 [ 24.935385][ T298] sock_close+0xb8/0x200 [ 24.939638][ T298] ? sock_mmap+0xa0/0xa0 [ 24.943894][ T298] __fput+0x2dc/0x730 [ 24.948014][ T298] ____fput+0x15/0x20 [ 24.952000][ T298] task_work_run+0x127/0x190 [ 24.956596][ T298] do_exit+0xa7c/0x24e0 [ 24.960754][ T298] ? __kasan_check_write+0x14/0x20 [ 24.965886][ T298] ? switch_fpu_return+0x19c/0x330 [ 24.971006][ T298] ? put_task_struct+0x90/0x90 [ 24.975786][ T298] ? fpu__clear_all+0x20/0x20 [ 24.980479][ T298] ? __kasan_check_read+0x11/0x20 [ 24.985519][ T298] __x64_sys_exit+0x40/0x40 [ 24.990124][ T298] do_syscall_64+0x31/0x40 [ 24.994557][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.000456][ T298] RIP: 0033:0x7f17ee939d79 [ 25.004875][ T298] Code: Unable to access opcode bytes at RIP 0x7f17ee939d4f. [ 25.012252][ T298] RSP: 002b:00007ffd07c42a48 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.020783][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f17ee939d79 [ 25.029239][ T298] RDX: 00007f17ee94b557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.037267][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.045572][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd07c42c68 [ 25.053582][ T298] R13: 0000000000000002 R14: 00007f17ee9caca0 R15: 0000000000000002 [ 25.061570][ T298] [ 25.063930][ T298] Allocated by task 297: [ 25.068186][ T298] __kasan_kmalloc+0xd4/0x100 [ 25.072875][ T298] __kmalloc+0x19f/0x330 [ 25.077125][ T298] l2tp_session_create+0x39/0xb60 [ 25.082265][ T298] pppol2tp_connect+0xbf5/0x1640 [ 25.087344][ T298] __sys_connect+0x3ce/0x450 [ 25.091936][ T298] __x64_sys_connect+0x7a/0x90 [ 25.096705][ T298] do_syscall_64+0x31/0x40 [ 25.101127][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.107022][ T298] [ 25.109447][ T298] Freed by task 9: [ 25.113175][ T298] kasan_set_track+0x4a/0x70 [ 25.117779][ T298] kasan_set_free_info+0x23/0x40 [ 25.122749][ T298] ____kasan_slab_free+0x125/0x160 [ 25.127869][ T298] __kasan_slab_free+0x11/0x20 [ 25.132642][ T298] slab_free_freelist_hook+0xc5/0x190 [ 25.138063][ T298] kfree+0xc0/0x270 [ 25.141885][ T298] l2tp_session_put+0xb2/0x1a0 [ 25.146675][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 25.152050][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 25.157469][ T298] process_one_work+0x6fd/0xbc0 [ 25.162434][ T298] worker_thread+0xa8e/0x13c0 [ 25.167112][ T298] kthread+0x324/0x3b0 [ 25.171186][ T298] ret_from_fork+0x1f/0x30 [ 25.175602][ T298] [ 25.177939][ T298] The buggy address belongs to the object at ffff8881095fe800 [ 25.177939][ T298] which belongs to the cache kmalloc-512 of size 512 [ 25.192091][ T298] The buggy address is located 0 bytes inside of [ 25.192091][ T298] 512-byte region [ffff8881095fe800, ffff8881095fea00) [ 25.205287][ T298] The buggy address belongs to the page: [ 25.210955][ T298] page:ffffea0004257f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1095fc [ 25.221221][ T298] head:ffffea0004257f00 order:2 compound_mapcount:0 compound_pincount:0 [ 25.229554][ T298] flags: 0x4000000000010200(slab|head) [ 25.235112][ T298] raw: 4000000000010200 ffffea0004254900 0000000200000002 ffff888100043080 [ 25.243879][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.252515][ T298] page dumped because: kasan: bad access detected [ 25.259058][ T298] page_owner tracks the page as allocated [ 25.264803][ 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 2389475838, free_ts 0 [ 25.282688][ T298] prep_new_page+0x176/0x190 [ 25.287291][ T298] get_page_from_freelist+0x225f/0x23f0 [ 25.292840][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 25.298244][ T298] new_slab+0x84/0x3f0 [ 25.302320][ T298] ___slab_alloc+0x2f8/0x4c0 [ 25.306923][ T298] __slab_alloc+0x63/0xa0 [ 25.311255][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 25.316650][ T298] efi_partition+0x3dc/0x2f40 [ 25.321329][ T298] blk_add_partitions+0x45c/0x1150 [ 25.326445][ T298] bdev_disk_changed+0x3d5/0x4d0 [ 25.331924][ T298] __blkdev_get+0xa02/0x13c0 [ 25.336520][ T298] blkdev_get_by_dev+0x306/0x540 [ 25.341551][ T298] __device_add_disk+0x987/0x1010 [ 25.346575][ T298] device_add_disk+0x2a/0x40 [ 25.351165][ T298] brd_init+0x284/0x468 [ 25.355328][ T298] do_one_initcall+0x205/0x5e0 [ 25.360103][ T298] page_owner free stack trace missing [ 25.365497][ T298] [ 25.367903][ T298] Memory state around the buggy address: [ 25.373545][ T298] ffff8881095fe700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.381609][ T298] ffff8881095fe780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.389671][ T298] >ffff8881095fe800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.397738][ T298] ^ [ 25.401918][ T298] ffff8881095fe880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.409985][ T298] ffff8881095fe900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.418131][ T298] ================================================================== [ 25.426192][ T298] Disabling lock debugging due to kernel taint [ 25.432654][ T298] ------------[ cut here ]------------ [ 25.438195][ T298] WARNING: CPU: 1 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 25.448263][ T24] audit: type=1400 audit(1792371455.110:68): 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 [ 25.449774][ T298] Modules linked in: [ 25.471329][ T24] audit: type=1400 audit(1792371455.120:69): 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 [ 25.471366][ T24] audit: type=1400 audit(1792371455.120:70): 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 [ 25.476011][ T298] CPU: 0 PID: 298 Comm: syz-executor273 Tainted: G B syzkaller #0 [ 25.496701][ T24] audit: type=1400 audit(1792371455.120:71): 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 [ 25.518183][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 25.527551][ T24] audit: type=1400 audit(1792371455.120:72): 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 [ 25.548393][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 25.558233][ T24] audit: type=1400 audit(1792371455.120:73): 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 [ 25.578486][ T298] Code: 5d c3 e8 bc f7 34 fd be 02 00 00 00 eb 0a e8 b0 f7 34 fd be 01 00 00 00 4c 89 f7 e8 33 73 0e fe e9 0f ff ff ff e8 99 f7 34 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 88 f7 34 fd 4c 89 f7 be 03 [ 25.627697][ T298] RSP: 0018:ffffc9000096fc40 EFLAGS: 00010293 [ 25.633835][ T298] RAX: ffffffff842fbf27 RBX: ffff88811affa800 RCX: ffff88811f3c5000 [ 25.641851][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 25.650111][ T298] RBP: ffffc9000096fc60 R08: 0000000000000003 R09: 0000000000000004 [ 25.658281][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 25.666399][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881095fe800 [ 25.674410][ T298] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 25.683486][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.690349][ T298] CR2: 00007f17ee94b4f0 CR3: 000000010d554000 CR4: 00000000003506b0 [ 25.698558][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.706569][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.714595][ T298] Call Trace: [ 25.717900][ T298] pppol2tp_release+0x150/0x2b0 [ 25.722798][ T298] sock_close+0xb8/0x200 [ 25.727243][ T298] ? sock_mmap+0xa0/0xa0 [ 25.731490][ T298] __fput+0x2dc/0x730 [ 25.735524][ T298] ____fput+0x15/0x20 [ 25.739524][ T298] task_work_run+0x127/0x190 [ 25.744156][ T298] do_exit+0xa7c/0x24e0 [ 25.748334][ T298] ? __kasan_check_write+0x14/0x20 [ 25.753487][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.758886][ T298] ? put_task_struct+0x90/0x90 [ 25.763704][ T298] ? fpu__clear_all+0x20/0x20 [ 25.768409][ T298] ? __kasan_check_read+0x11/0x20 [ 25.773683][ T298] __x64_sys_exit+0x40/0x40 [ 25.778217][ T298] do_syscall_64+0x31/0x40 [ 25.782686][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.788601][ T298] RIP: 0033:0x7f17ee939d79 [ 25.793074][ T298] Code: Unable to access opcode bytes at RIP 0x7f17ee939d4f. [ 25.800450][ T298] RSP: 002b:00007ffd07c42a48 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.809022][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f17ee939d79 [ 25.817044][ T298] RDX: 00007f17ee94b557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.825071][ T298] RBP