ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2982051281 <...> Warning: Permanently added '10.128.1.37' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2982051281", ["ci2-android-5-10/syz-executor2982051281"], 0x7fff9a4a41e0 /* 10 vars */) = 0 brk(NULL) = 0x55555cfba000 brk(0x55555cfbad40) = 0x55555cfbad40 arch_prctl(ARCH_SET_FS, 0x55555cfba3c0) = 0 set_tid_address(0x55555cfba690) = 297 set_robust_list(0x55555cfba6a0, 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-executor2982051281", 4096) = 45 getrandom("\x3e\xa4\x2c\x6f\x66\xae\xd3\x5b", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555cfbad40 brk(0x55555cfdbd40) = 0x55555cfdbd40 brk(0x55555cfdc000) = 0x55555cfdc000 mprotect(0x7f416605d000, 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 +++ [ 25.092376][ T24] audit: type=1400 audit(1790327167.060:64): avc: denied { execmem } for pid=297 comm="syz-executor298" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.112147][ T24] audit: type=1400 audit(1790327167.070:65): avc: denied { create } for pid=297 comm="syz-executor298" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.132770][ T24] audit: type=1400 audit(1790327167.070:66): avc: denied { connect } for pid=297 comm="syz-executor298" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.152798][ T24] audit: type=1400 audit(1790327167.090:67): avc: denied { ioctl } for pid=297 comm="syz-executor298" path="socket:[14580]" dev="sockfs" ino=14580 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.283591][ T298] ================================================================== [ 25.291701][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.299763][ T298] Read of size 4 at addr ffff88810acfac00 by task syz-executor298/298 [ 25.307905][ T298] [ 25.310265][ T298] CPU: 1 PID: 298 Comm: syz-executor298 Not tainted syzkaller #0 [ 25.317970][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.328045][ T298] Call Trace: [ 25.331329][ T298] __dump_stack+0x21/0x24 [ 25.335740][ T298] dump_stack_lvl+0x1a7/0x208 [ 25.340409][ T298] ? show_regs_print_info+0x18/0x18 [ 25.345618][ T298] ? thaw_kernel_threads+0x220/0x220 [ 25.350896][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 25.356089][ T298] print_address_description+0x7f/0x2c0 [ 25.361628][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.367344][ T298] kasan_report+0x100/0x140 [ 25.371840][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.377553][ T298] __asan_report_load4_noabort+0x14/0x20 [ 25.383204][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.388757][ T298] pppol2tp_release+0x150/0x2b0 [ 25.393617][ T298] sock_close+0xb8/0x200 [ 25.397847][ T298] ? sock_mmap+0xa0/0xa0 [ 25.402074][ T298] __fput+0x2dc/0x730 [ 25.406050][ T298] ____fput+0x15/0x20 [ 25.410042][ T298] task_work_run+0x127/0x190 [ 25.414623][ T298] do_exit+0xa7c/0x24e0 [ 25.418776][ T298] ? __kasan_check_write+0x14/0x20 [ 25.423880][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.428987][ T298] ? put_task_struct+0x90/0x90 [ 25.433775][ T298] ? fpu__clear_all+0x20/0x20 [ 25.438466][ T298] ? __kasan_check_read+0x11/0x20 [ 25.443502][ T298] __x64_sys_exit+0x40/0x40 [ 25.448011][ T298] do_syscall_64+0x31/0x40 [ 25.452435][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.458332][ T298] RIP: 0033:0x7f4165fccd79 [ 25.462774][ T298] Code: Unable to access opcode bytes at RIP 0x7f4165fccd4f. [ 25.470152][ T298] RSP: 002b:00007fff090884a8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.478571][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f4165fccd79 [ 25.486549][ T298] RDX: 00007f4165fde557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.494524][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.502513][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff090886c8 [ 25.510496][ T298] R13: 0000000000000002 R14: 00007f416605dca0 R15: 0000000000000002 [ 25.518478][ T298] [ 25.520812][ T298] Allocated by task 297: [ 25.525078][ T298] __kasan_kmalloc+0xd4/0x100 [ 25.529765][ T298] __kmalloc+0x19f/0x330 [ 25.534010][ T298] l2tp_session_create+0x39/0xb60 [ 25.539042][ T298] pppol2tp_connect+0xbf5/0x1640 [ 25.543986][ T298] __sys_connect+0x3ce/0x450 [ 25.548581][ T298] __x64_sys_connect+0x7a/0x90 [ 25.553347][ T298] do_syscall_64+0x31/0x40 [ 25.557771][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.563662][ T298] [ 25.565995][ T298] Freed by task 49: [ 25.569805][ T298] kasan_set_track+0x4a/0x70 [ 25.574401][ T298] kasan_set_free_info+0x23/0x40 [ 25.579341][ T298] ____kasan_slab_free+0x125/0x160 [ 25.584500][ T298] __kasan_slab_free+0x11/0x20 [ 25.589291][ T298] slab_free_freelist_hook+0xc5/0x190 [ 25.594692][ T298] kfree+0xc0/0x270 [ 25.598505][ T298] l2tp_session_put+0xb2/0x1a0 [ 25.603272][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 25.608396][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 25.613598][ T298] process_one_work+0x6fd/0xbc0 [ 25.618456][ T298] worker_thread+0xa8e/0x13c0 [ 25.623137][ T298] kthread+0x324/0x3b0 [ 25.627208][ T298] ret_from_fork+0x1f/0x30 [ 25.631620][ T298] [ 25.633953][ T298] Last potentially related work creation: [ 25.639680][ T298] kasan_save_stack+0x3a/0x60 [ 25.644369][ T298] __kasan_record_aux_stack+0xd2/0x100 [ 25.649837][ T298] kasan_record_aux_stack_noalloc+0xb/0x10 [ 25.655645][ T298] call_rcu+0x11a/0x1090 [ 25.659888][ T298] blkg_release+0x23/0x30 [ 25.664220][ T298] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 25.670371][ T298] rcu_do_batch+0x488/0xaf0 [ 25.674872][ T298] rcu_core+0x50a/0xca0 [ 25.679033][ T298] rcu_core_si+0x9/0x10 [ 25.683189][ T298] __do_softirq+0x255/0x563 [ 25.687706][ T298] [ 25.690041][ T298] The buggy address belongs to the object at ffff88810acfac00 [ 25.690041][ T298] which belongs to the cache kmalloc-512 of size 512 [ 25.704093][ T298] The buggy address is located 0 bytes inside of [ 25.704093][ T298] 512-byte region [ffff88810acfac00, ffff88810acfae00) [ 25.717187][ T298] The buggy address belongs to the page: [ 25.722856][ T298] page:ffffea00042b3e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10acf8 [ 25.733099][ T298] head:ffffea00042b3e00 order:2 compound_mapcount:0 compound_pincount:0 [ 25.741422][ T298] flags: 0x4000000000010200(slab|head) [ 25.746885][ T298] raw: 4000000000010200 ffffea00042b2000 0000000600000006 ffff888100043080 [ 25.755561][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.764168][ T298] page dumped because: kasan: bad access detected [ 25.770580][ T298] page_owner tracks the page as allocated [ 25.776464][ 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 2285352331, free_ts 0 [ 25.794356][ T298] prep_new_page+0x176/0x190 [ 25.798961][ T298] get_page_from_freelist+0x225f/0x23f0 [ 25.804507][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 25.809888][ T298] new_slab+0x84/0x3f0 [ 25.813960][ T298] ___slab_alloc+0x2f8/0x4c0 [ 25.818564][ T298] __slab_alloc+0x63/0xa0 [ 25.822901][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 25.828454][ T298] blkg_alloc+0x6d/0x570 [ 25.832696][ T298] blkcg_init_queue+0x2d/0x330 [ 25.837465][ T298] blk_alloc_queue+0x444/0x5f0 [ 25.842235][ T298] blk_mq_init_queue+0x37/0xd0 [ 25.847001][ T298] scsi_mq_alloc_queue+0x42/0x140 [ 25.852033][ T298] scsi_alloc_sdev+0x611/0x920 [ 25.856807][ T298] scsi_probe_and_add_lun+0x17d/0x3370 [ 25.862311][ T298] __scsi_scan_target+0x1d2/0xbf0 [ 25.867353][ T298] scsi_scan_host_selected+0x34e/0x600 [ 25.872817][ T298] page_owner free stack trace missing [ 25.878186][ T298] [ 25.880512][ T298] Memory state around the buggy address: [ 25.886148][ T298] ffff88810acfab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.894211][ T298] ffff88810acfab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.902295][ T298] >ffff88810acfac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.910353][ T298] ^ [ 25.914430][ T298] ffff88810acfac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.922514][ T298] ffff88810acfad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.930604][ T298] ================================================================== [ 25.938663][ T298] Disabling lock debugging due to kernel taint [ 25.945145][ T298] ------------[ cut here ]------------ [ 25.950949][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 25.960992][ T298] Modules linked in: [ 25.964974][ T24] audit: type=1400 audit(1790327167.940:68): 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 [ 25.967574][ T298] CPU: 1 PID: 298 Comm: syz-executor298 Tainted: G B syzkaller #0 [ 25.986826][ T24] audit: type=1400 audit(1790327167.940:69): 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 [ 25.996333][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 26.017154][ T24] audit: type=1400 audit(1790327167.940:70): 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 [ 26.027660][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 26.048396][ T24] audit: type=1400 audit(1790327167.940:71): 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 [ 26.055491][ 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 [ 26.075159][ T24] audit: type=1400 audit(1790327167.940:72): 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 [ 26.095160][ T298] RSP: 0018:ffffc90000b47c40 EFLAGS: 00010293 [ 26.115123][ T24] audit: type=1400 audit(1790327167.940:73): 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 [ 26.115127][ T298] [ 26.115161][ T298] RAX: ffffffff842f5aa7 RBX: ffff88810b169800 RCX: ffff88810b0b3c00 [ 26.154364][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 26.162378][ T298] RBP: ffffc90000b47c60 R08: 0000000000000003 R09: 0000000000000004 [ 26.170358][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 26.178399][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810acfac00 [ 26.186415][ T298] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 26.195418][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.202016][ T298] CR2: 00007f4165fde4f0 CR3: 000000010d655000 CR4: 00000000003506a0 [ 26.210026][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.218021][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.226034][ T298] Call Trace: [ 26.229336][ T298] pppol2tp_release+0x150/0x2b0 [ 26.234231][ T298] sock_close+0xb8/0x200 [ 26.238484][ T298] ? sock_mmap+0xa0/0xa0 [ 26.242779][ T298] __fput+0x2dc/0x730 [ 26.246769][ T298] ____fput+0x15/0x20 [ 26.250850][ T298] task_work_run+0x127/0x190 [ 26.255481][ T298] do_exit+0xa7c/0x24e0 [ 26.259673][ T298] ? __kasan_check_write+0x14/0x20 [ 26.264813][ T298] ? switch_fpu_return+0x19c/0x330 [ 26.269938][ T298] ? put_task_struct+0x90/0x90 [ 26.274727][ T298] ? fpu__clear_all+0x20/0x20 [ 26.279434][ T298] ? __kasan_check_read+0x11/0x20 [ 26.284488][ T298] __x64_sys_exit+0x40/0x40 [ 26.289140][ T298] do_syscall_64+0x31/0x40 [ 26.293644][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.299542][ T298] RIP: 0033:0x7f4165fccd79 [ 26.303980][ T298] Code: Unable to access opcode bytes at RIP 0x7f4165fccd4f. [ 26.311348][ T298] RSP: 002b:00007fff090884a8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.319832][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f4165fccd79 [ 26.327836][ T298] RDX: 00007f4165fde557 RSI: 0000000000000000 RDI: 0000000000000000 [ 26.335842][ T298] RBP: