ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1163809268 <...> Warning: Permanently added '10.128.0.157' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1163809268", ["ci2-android-5-10/syz-executor1163809268"], 0x7ffc8bf89b60 /* 10 vars */) = 0 brk(NULL) = 0x555583fef000 brk(0x555583fefd40) = 0x555583fefd40 arch_prctl(ARCH_SET_FS, 0x555583fef3c0) = 0 set_tid_address(0x555583fef690) = 297 set_robust_list(0x555583fef6a0, 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-executor1163809268", 4096) = 45 getrandom("\x42\x69\xad\x24\x24\x81\xc7\x8c", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555583fefd40 brk(0x555584010d40) = 0x555584010d40 brk(0x555584011000) = 0x555584011000 mprotect(0x7f5faa84c000, 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 futex(0x7f5faa852b4c, FUTEX_WAKE_PRIVATE, 1000000) = 0 executing program rt_sigaction(SIGRT_1, {sa_handler=0x7f5faa7b60d0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f5faa7a89e0}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f5faa765000 mprotect(0x7f5faa766000, 131072, PROT_READ|PROT_WRITE) = 0 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7f5faa785990, parent_tid=0x7f5faa785990, exit_signal=0, stack=0x7f5faa765000, stack_size=0x20300, tls=0x7f5faa7856c0}ci2-android-5-10/strace-static-x86_64: Process 298 attached => {parent_tid=[298]}, 88) = 298 [pid 297] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 297] futex(0x7f5faa852b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f5faa852b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] set_robust_list(0x7f5faa7859a0, 24) = 0 [pid 298] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 298] socket(AF_PPPOX, SOCK_STREAM, 1) = 3 [pid 298] futex(0x7f5faa852b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 298] <... futex resumed>) = 1 [pid 297] futex(0x7f5faa852b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f5faa852b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 4 [pid 298] futex(0x7f5faa852b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 298] <... futex resumed>) = 1 [pid 297] futex(0x7f5faa852b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f5faa852b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [ 26.512025][ T24] audit: type=1400 audit(1789653676.510:64): avc: denied { execmem } for pid=297 comm="syz-executor116" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 26.533519][ T24] audit: type=1400 audit(1789653676.530:65): avc: denied { create } for pid=297 comm="syz-executor116" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [pid 298] 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 [pid 298] futex(0x7f5faa852b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 297] futex(0x7f5faa852b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f5faa852b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] <... futex resumed>) = 1 [pid 298] sendfile(-1, -1, [3], 2757) = -1 EBADF (Bad file descriptor) [pid 298] futex(0x7f5faa852b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 298] <... futex resumed>) = 1 [pid 297] futex(0x7f5faa852b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f5faa852b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] 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) = 299 [pid 298] futex(0x7f5faa852b4c, FUTEX_WAKE_PRIVATE, 1000000 [pid 297] <... futex resumed>) = 0 [pid 298] <... futex resumed>) = 1 [pid 297] futex(0x7f5faa852b48, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 297] futex(0x7f5faa852b4c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 298] ioctl(3, PPPIOCSMRU, 0) = -1 ENOSYS (Function not implemented) [pid 298] futex(0x7f5faa852b4c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 298] futex(0x7f5faa852b48, FUTEX_WAIT_PRIVATE, 0, NULL [pid 297] <... futex resumed>) = 0 [pid 297] exit_group(0) = ? [pid 298] <... futex resumed>) = ? [pid 298] +++ exited with 0 +++ +++ exited with 0 +++ [ 26.556367][ T24] audit: type=1400 audit(1789653676.560:66): avc: denied { connect } for pid=297 comm="syz-executor116" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.580514][ T24] audit: type=1400 audit(1789653676.580:67): avc: denied { ioctl } for pid=297 comm="syz-executor116" path="socket:[1552]" dev="sockfs" ino=1552 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.730472][ T299] ================================================================== [ 26.738580][ T299] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.746646][ T299] Read of size 4 at addr ffff88810b459800 by task syz-executor116/299 [ 26.754785][ T299] [ 26.757149][ T299] CPU: 0 PID: 299 Comm: syz-executor116 Not tainted syzkaller #0 [ 26.764857][ T299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 26.774922][ T299] Call Trace: [ 26.778235][ T299] __dump_stack+0x21/0x24 [ 26.782557][ T299] dump_stack_lvl+0x1a7/0x208 [ 26.787226][ T299] ? show_regs_print_info+0x18/0x18 [ 26.792420][ T299] ? thaw_kernel_threads+0x220/0x220 [ 26.797701][ T299] ? __local_bh_enable_ip+0x53/0x80 [ 26.802893][ T299] print_address_description+0x7f/0x2c0 [ 26.808431][ T299] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.814145][ T299] kasan_report+0x100/0x140 [ 26.818641][ T299] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.824354][ T299] __asan_report_load4_noabort+0x14/0x20 [ 26.829981][ T299] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 26.835524][ T299] pppol2tp_release+0x150/0x2b0 [ 26.840398][ T299] sock_close+0xb8/0x200 [ 26.844636][ T299] ? sock_mmap+0xa0/0xa0 [ 26.849018][ T299] __fput+0x2dc/0x730 [ 26.853007][ T299] ____fput+0x15/0x20 [ 26.857004][ T299] task_work_run+0x127/0x190 [ 26.861614][ T299] do_exit+0xa7c/0x24e0 [ 26.865764][ T299] ? __kasan_check_write+0x14/0x20 [ 26.870868][ T299] ? switch_fpu_return+0x19c/0x330 [ 26.875974][ T299] ? put_task_struct+0x90/0x90 [ 26.880732][ T299] ? fpu__clear_all+0x20/0x20 [ 26.885402][ T299] ? __kasan_check_read+0x11/0x20 [ 26.890419][ T299] __x64_sys_exit+0x40/0x40 [ 26.894940][ T299] do_syscall_64+0x31/0x40 [ 26.899355][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.905238][ T299] RIP: 0033:0x7f5faa7a3859 [ 26.909645][ T299] Code: Unable to access opcode bytes at RIP 0x7f5faa7a382f. [ 26.917103][ T299] RSP: 002b:00007f5faa785118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.925524][ T299] RAX: ffffffffffffffda RBX: 00007f5faa852b48 RCX: 00007f5faa7a3859 [ 26.933508][ T299] RDX: 00007f5faa7859c8 RSI: 0000000000000000 RDI: 0000000000000000 [ 26.941477][ T299] RBP: 00007f5faa852b40 R08: 0000000000000000 R09: 0000000023800000 [ 26.949459][ T299] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5faa81e028 [ 26.957420][ T299] R13: 0000200000000040 R14: 0000200000000908 R15: 0000200000000900 [ 26.965400][ T299] [ 26.967715][ T299] Allocated by task 298: [ 26.971960][ T299] __kasan_kmalloc+0xd4/0x100 [ 26.976635][ T299] __kmalloc+0x19f/0x330 [ 26.980869][ T299] l2tp_session_create+0x39/0xb60 [ 26.985896][ T299] pppol2tp_connect+0xbf5/0x1640 [ 26.990823][ T299] __sys_connect+0x3ce/0x450 [ 26.995429][ T299] __x64_sys_connect+0x7a/0x90 [ 27.000189][ T299] do_syscall_64+0x31/0x40 [ 27.004604][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.010486][ T299] [ 27.012810][ T299] Freed by task 7: [ 27.016650][ T299] kasan_set_track+0x4a/0x70 [ 27.021249][ T299] kasan_set_free_info+0x23/0x40 [ 27.026185][ T299] ____kasan_slab_free+0x125/0x160 [ 27.031311][ T299] __kasan_slab_free+0x11/0x20 [ 27.036071][ T299] slab_free_freelist_hook+0xc5/0x190 [ 27.041435][ T299] kfree+0xc0/0x270 [ 27.045260][ T299] l2tp_session_put+0xb2/0x1a0 [ 27.050019][ T299] l2tp_session_delete+0x3a9/0x4a0 [ 27.055125][ T299] l2tp_tunnel_del_work+0x180/0x3d0 [ 27.060318][ T299] process_one_work+0x6fd/0xbc0 [ 27.065164][ T299] worker_thread+0xa8e/0x13c0 [ 27.069835][ T299] kthread+0x324/0x3b0 [ 27.073900][ T299] ret_from_fork+0x1f/0x30 [ 27.078306][ T299] [ 27.080635][ T299] The buggy address belongs to the object at ffff88810b459800 [ 27.080635][ T299] which belongs to the cache kmalloc-512 of size 512 [ 27.094984][ T299] The buggy address is located 0 bytes inside of [ 27.094984][ T299] 512-byte region [ffff88810b459800, ffff88810b459a00) [ 27.108070][ T299] The buggy address belongs to the page: [ 27.113713][ T299] page:ffffea00042d1600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b458 [ 27.123940][ T299] head:ffffea00042d1600 order:2 compound_mapcount:0 compound_pincount:0 [ 27.132267][ T299] flags: 0x4000000000010200(slab|head) [ 27.137725][ T299] raw: 4000000000010200 ffffea00042d0f00 0000000200000002 ffff888100043080 [ 27.146303][ T299] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 27.154871][ T299] page dumped because: kasan: bad access detected [ 27.161273][ T299] page_owner tracks the page as allocated [ 27.167000][ T299] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 7, ts 2461908837, free_ts 2461302669 [ 27.185657][ T299] prep_new_page+0x176/0x190 [ 27.190255][ T299] get_page_from_freelist+0x225f/0x23f0 [ 27.195802][ T299] __alloc_pages_nodemask+0x29a/0x640 [ 27.201170][ T299] new_slab+0x84/0x3f0 [ 27.205235][ T299] ___slab_alloc+0x2f8/0x4c0 [ 27.209828][ T299] __slab_alloc+0x63/0xa0 [ 27.214155][ T299] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 27.219523][ T299] sbitmap_queue_init_node+0x6af/0xf20 [ 27.224973][ T299] blk_mq_init_tags+0x1a2/0x380 [ 27.229813][ T299] blk_mq_alloc_rq_map+0x84/0x1b0 [ 27.234831][ T299] blk_mq_init_sched+0x20e/0xb70 [ 27.239766][ T299] elevator_init_mq+0x353/0x470 [ 27.244613][ T299] __device_add_disk+0x6d/0x1010 [ 27.249562][ T299] device_add_disk+0x2a/0x40 [ 27.254177][ T299] sd_probe+0xb7b/0x10e0 [ 27.258416][ T299] really_probe+0x3bf/0xa60 [ 27.262905][ T299] page last free stack trace: [ 27.267598][ T299] __free_pages_ok+0x80b/0x830 [ 27.272355][ T299] __free_pages+0xd8/0x390 [ 27.276766][ T299] free_pages+0x82/0x90 [ 27.280914][ T299] __stack_depot_save+0x492/0x4c0 [ 27.285950][ T299] __kasan_slab_alloc+0xc9/0xe0 [ 27.290812][ T299] slab_post_alloc_hook+0x5d/0x2f0 [ 27.295918][ T299] kmem_cache_alloc+0x15a/0x2d0 [ 27.300761][ T299] __kernfs_new_node+0xe1/0x670 [ 27.305621][ T299] kernfs_new_node+0x150/0x260 [ 27.310388][ T299] kernfs_create_link+0xa4/0x200 [ 27.315320][ T299] sysfs_do_create_link_sd+0x8a/0x110 [ 27.320683][ T299] sysfs_create_link+0x68/0x80 [ 27.325442][ T299] device_add_class_symlinks+0x155/0x2a0 [ 27.331063][ T299] device_add+0x4d2/0xc00 [ 27.335386][ T299] device_register+0x1d/0x20 [ 27.339986][ T299] __mdiobus_register+0x215/0x7d0 [ 27.344998][ T299] [ 27.347320][ T299] Memory state around the buggy address: [ 27.352958][ T299] ffff88810b459700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.361016][ T299] ffff88810b459780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.369070][ T299] >ffff88810b459800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.377124][ T299] ^ [ 27.381191][ T299] ffff88810b459880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.389245][ T299] ffff88810b459900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.397296][ T299] ================================================================== [ 27.405362][ T299] Disabling lock debugging due to kernel taint [ 27.411853][ T299] ------------[ cut here ]------------ [ 27.417450][ T299] WARNING: CPU: 1 PID: 299 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 27.427678][ T24] audit: type=1400 audit(1789653677.430:68): 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 [ 27.433514][ T299] Modules linked in: [ 27.449415][ T24] audit: type=1400 audit(1789653677.430:69): 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 [ 27.453318][ T299] CPU: 1 PID: 299 Comm: syz-executor116 Tainted: G B syzkaller #0 [ 27.474852][ T24] audit: type=1400 audit(1789653677.430:70): 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 [ 27.484495][ T299] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 27.505017][ T24] audit: type=1400 audit(1789653677.430:71): 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 [ 27.515527][ T299] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 27.535520][ T24] audit: type=1400 audit(1789653677.430:72): 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 [ 27.542636][ T299] 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 [ 27.562158][ T24] audit: type=1400 audit(1789653677.430:73): 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 [ 27.581759][ T299] RSP: 0018:ffffc9000098fc40 EFLAGS: 00010293 [ 27.610649][ T299] RAX: ffffffff842f5aa7 RBX: ffff88811e164000 RCX: ffff88811da76400 [ 27.618815][ T299] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 27.626827][ T299] RBP: ffffc9000098fc60 R08: 0000000000000003 R09: 0000000000000004 [ 27.634798][ T299] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 27.642851][ T299] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810b459800 [ 27.650856][ T299] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 27.659831][ T299] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.666439][ T299] CR2: 00000000006aa5b0 CR3: 000000010d488000 CR4: 00000000003506a0 [ 27.674425][ T299] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.682444][ T299] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.690448][ T299] Call Trace: [ 27.693753][ T299] pppol2tp_release+0x150/0x2b0 [ 27.698705][ T299] sock_close+0xb8/0x200 [ 27.702968][ T299] ? sock_mmap+0xa0/0xa0 [ 27.707267][ T299] __fput+0x2dc/0x730 [ 27.711284][ T299] ____fput+0x15/0x20 [ 27.715259][ T299] task_work_run+0x127/0x190 [ 27.719890][ T299] do_exit+0xa7c/0x24e0 [ 27.724063][ T299] ? __kasan_check_write+0x14/0x20 [ 27.729216][ T299] ? switch_fpu_return+0x19c/0x330 [ 27.734344][ T299] ? put_task_struct+0x90/0x90 [ 27.739149][ T299] ? fpu__clear_all+0x20/0x20 [ 27.743845][ T299] ? __kasan_check_read+0x11/0x20 [ 27.748923][ T299] __x64_sys_exit+0x40/0x40 [ 27.753446][ T299] do_syscall_64+0x31/0x40 [ 27.757923][ T299] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.763830][ T299] RIP: 0033:0x7f5faa7a3859 [ 27.768272][ T299] Code: Unable to access opcode bytes at RIP 0x7f5faa7a382f. [ 27.775683][ T299] RSP: 002b:00007f5faa785118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 27.784089