ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor301890393 <...> cess permissive=1 [ 15.190742][ T24] audit: type=1400 audit(1785823708.269:63): avc: denied { siginh } for pid=217 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.72' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor301890393", ["ci2-android-5-10/syz-executor301890393"], 0x7ffe682dfac0 /* 10 vars */) = 0 brk(NULL) = 0x5555605f0000 brk(0x5555605f0d40) = 0x5555605f0d40 arch_prctl(ARCH_SET_FS, 0x5555605f03c0) = 0 set_tid_address(0x5555605f0690) = 297 set_robust_list(0x5555605f06a0, 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-executor301890393", 4096) = 44 getrandom("\xd2\xef\xe5\xc2\xba\xc4\x9d\x64", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555605f0d40 brk(0x555560611d40) = 0x555560611d40 brk(0x555560612000) = 0x555560612000 mprotect(0x7f85f2434000, 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, PPPIOCSFLAGS, 0) = -1 ENOSYS (Function not implemented) exit_group(0) = ? +++ exited with 0 +++ [ 24.298206][ T24] audit: type=1400 audit(1785823717.389:64): avc: denied { execmem } for pid=297 comm="syz-executor301" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.317880][ T24] audit: type=1400 audit(1785823717.399:65): avc: denied { create } for pid=297 comm="syz-executor301" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.338023][ T24] audit: type=1400 audit(1785823717.399:66): avc: denied { connect } for pid=297 comm="syz-executor301" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.358015][ T24] audit: type=1400 audit(1785823717.419:67): avc: denied { ioctl } for pid=297 comm="syz-executor301" path="socket:[1489]" dev="sockfs" ino=1489 ioctlcmd=0x7459 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.488633][ T298] ================================================================== [ 24.496719][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.504756][ T298] Read of size 4 at addr ffff88810afd0000 by task syz-executor301/298 [ 24.512874][ T298] [ 24.515183][ T298] CPU: 0 PID: 298 Comm: syz-executor301 Not tainted syzkaller #0 [ 24.522861][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.532900][ T298] Call Trace: [ 24.536182][ T298] __dump_stack+0x21/0x24 [ 24.540485][ T298] dump_stack_lvl+0x1a7/0x208 [ 24.545133][ T298] ? show_regs_print_info+0x18/0x18 [ 24.550303][ T298] ? thaw_kernel_threads+0x220/0x220 [ 24.555578][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 24.560753][ T298] print_address_description+0x7f/0x2c0 [ 24.566530][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.572221][ T298] kasan_report+0x100/0x140 [ 24.576694][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.582645][ T298] __asan_report_load4_noabort+0x14/0x20 [ 24.588250][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.593770][ T298] pppol2tp_release+0x150/0x2b0 [ 24.598590][ T298] sock_close+0xb8/0x200 [ 24.602799][ T298] ? sock_mmap+0xa0/0xa0 [ 24.607012][ T298] __fput+0x2dc/0x730 [ 24.610972][ T298] ____fput+0x15/0x20 [ 24.614928][ T298] task_work_run+0x127/0x190 [ 24.619506][ T298] do_exit+0xa7c/0x24e0 [ 24.623632][ T298] ? __kasan_check_write+0x14/0x20 [ 24.628727][ T298] ? switch_fpu_return+0x19c/0x330 [ 24.633817][ T298] ? put_task_struct+0x90/0x90 [ 24.638546][ T298] ? fpu__clear_all+0x20/0x20 [ 24.643200][ T298] ? __kasan_check_read+0x11/0x20 [ 24.648195][ T298] __x64_sys_exit+0x40/0x40 [ 24.652690][ T298] do_syscall_64+0x31/0x40 [ 24.657074][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.662963][ T298] RIP: 0033:0x7f85f23a3d79 [ 24.667358][ T298] Code: Unable to access opcode bytes at RIP 0x7f85f23a3d4f. [ 24.674705][ T298] RSP: 002b:00007ffe84ebe9e8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 24.683097][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f85f23a3d79 [ 24.691050][ T298] RDX: 00007f85f23b5557 RSI: 0000000000000000 RDI: 0000000000000000 [ 24.698996][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 24.706945][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe84ebec08 [ 24.714890][ T298] R13: 0000000000000002 R14: 00007f85f2434ca0 R15: 0000000000000002 [ 24.722859][ T298] [ 24.725165][ T298] Allocated by task 297: [ 24.729386][ T298] __kasan_kmalloc+0xd4/0x100 [ 24.734035][ T298] __kmalloc+0x19f/0x330 [ 24.738257][ T298] l2tp_session_create+0x39/0xb60 [ 24.743253][ T298] pppol2tp_connect+0xbf5/0x1640 [ 24.748162][ T298] __sys_connect+0x3ce/0x450 [ 24.752722][ T298] __x64_sys_connect+0x7a/0x90 [ 24.757460][ T298] do_syscall_64+0x31/0x40 [ 24.761856][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.767717][ T298] [ 24.770018][ T298] Freed by task 7: [ 24.773712][ T298] kasan_set_track+0x4a/0x70 [ 24.778271][ T298] kasan_set_free_info+0x23/0x40 [ 24.783178][ T298] ____kasan_slab_free+0x125/0x160 [ 24.788258][ T298] __kasan_slab_free+0x11/0x20 [ 24.792992][ T298] slab_free_freelist_hook+0xc5/0x190 [ 24.798334][ T298] kfree+0xc0/0x270 [ 24.802118][ T298] l2tp_session_put+0xb2/0x1a0 [ 24.806856][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 24.811939][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 24.817112][ T298] process_one_work+0x6fd/0xbc0 [ 24.821937][ T298] worker_thread+0xa8e/0x13c0 [ 24.826587][ T298] kthread+0x324/0x3b0 [ 24.830635][ T298] ret_from_fork+0x1f/0x30 [ 24.835029][ T298] [ 24.837336][ T298] Last potentially related work creation: [ 24.843035][ T298] kasan_save_stack+0x3a/0x60 [ 24.847691][ T298] __kasan_record_aux_stack+0xd2/0x100 [ 24.853124][ T298] kasan_record_aux_stack_noalloc+0xb/0x10 [ 24.858907][ T298] call_rcu+0x11a/0x1090 [ 24.863124][ T298] blkg_release+0x23/0x30 [ 24.867428][ T298] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 24.873557][ T298] rcu_do_batch+0x488/0xaf0 [ 24.878033][ T298] rcu_core+0x50a/0xca0 [ 24.882159][ T298] rcu_core_si+0x9/0x10 [ 24.886288][ T298] __do_softirq+0x255/0x563 [ 24.890759][ T298] [ 24.893065][ T298] The buggy address belongs to the object at ffff88810afd0000 [ 24.893065][ T298] which belongs to the cache kmalloc-512 of size 512 [ 24.907089][ T298] The buggy address is located 0 bytes inside of [ 24.907089][ T298] 512-byte region [ffff88810afd0000, ffff88810afd0200) [ 24.920153][ T298] The buggy address belongs to the page: [ 24.925774][ T298] page:ffffea00042bf400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10afd0 [ 24.935989][ T298] head:ffffea00042bf400 order:2 compound_mapcount:0 compound_pincount:0 [ 24.944286][ T298] flags: 0x4000000000010200(slab|head) [ 24.949720][ T298] raw: 4000000000010200 ffffea00042bc200 0000000600000006 ffff888100043080 [ 24.958276][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.966831][ T298] page dumped because: kasan: bad access detected [ 24.973222][ T298] page_owner tracks the page as allocated [ 24.978923][ 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 1809738498, free_ts 0 [ 24.996774][ T298] prep_new_page+0x176/0x190 [ 25.001338][ T298] get_page_from_freelist+0x225f/0x23f0 [ 25.006879][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 25.012222][ T298] new_slab+0x84/0x3f0 [ 25.016273][ T298] ___slab_alloc+0x2f8/0x4c0 [ 25.020835][ T298] __slab_alloc+0x63/0xa0 [ 25.025140][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 25.030484][ T298] blkg_alloc+0x6d/0x570 [ 25.034809][ T298] blkcg_init_queue+0x2d/0x330 [ 25.039562][ T298] blk_alloc_queue+0x444/0x5f0 [ 25.044298][ T298] blk_mq_init_queue+0x37/0xd0 [ 25.049038][ T298] scsi_mq_alloc_queue+0x42/0x140 [ 25.054034][ T298] scsi_alloc_sdev+0x611/0x920 [ 25.058796][ T298] scsi_probe_and_add_lun+0x17d/0x3370 [ 25.064229][ T298] __scsi_scan_target+0x1d2/0xbf0 [ 25.069321][ T298] scsi_scan_host_selected+0x34e/0x600 [ 25.074748][ T298] page_owner free stack trace missing [ 25.080092][ T298] [ 25.082398][ T298] Memory state around the buggy address: [ 25.088004][ T298] ffff88810afcff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.096040][ T298] ffff88810afcff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.104074][ T298] >ffff88810afd0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.112193][ T298] ^ [ 25.116234][ T298] ffff88810afd0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.124271][ T298] ffff88810afd0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.132303][ T298] ================================================================== [ 25.140357][ T298] Disabling lock debugging due to kernel taint [ 25.146784][ T298] ------------[ cut here ]------------ [ 25.151039][ T24] audit: type=1400 audit(1785823718.239:68): 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 [ 25.152310][ T298] WARNING: CPU: 1 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 25.174762][ T24] audit: type=1400 audit(1785823718.239:69): 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 [ 25.183858][ T298] Modules linked in: [ 25.183874][ T298] CPU: 1 PID: 298 Comm: syz-executor301 Tainted: G B syzkaller #0 [ 25.183879][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.183900][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 25.205501][ T24] audit: type=1400 audit(1785823718.239:70): 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 [ 25.209082][ T298] Code: 5d c3 e8 3c dd 35 fd be 02 00 00 00 eb 0a e8 30 dd 35 fd be 01 00 00 00 4c 89 f7 e8 a3 52 0f fe e9 0f ff ff ff e8 19 dd 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 08 dd 35 fd 4c 89 f7 be 03 [ 25.218327][ T24] audit: type=1400 audit(1785823718.239:71): 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 [ 25.228209][ T298] RSP: 0018:ffffc90000b27c40 EFLAGS: 00010293 [ 25.228221][ T298] RAX: ffffffff842ec667 RBX: ffff88811afd4800 RCX: ffff88810b223b40 [ 25.228227][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 25.228233][ T298] RBP: ffffc90000b27c60 R08: 0000000000000003 R09: 0000000000000004 [ 25.228240][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf648 R12: dffffc0000000000 [ 25.228246][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810afd0000 [ 25.228265][ T298] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 25.234975][ T24] audit: type=1400 audit(1785823718.239:72): 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 [ 25.255688][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.255705][ T298] CR2: 00000000006aa5b0 CR3: 000000000640f000 CR4: 00000000003506a0 [ 25.275537][ T24] audit: type=1400 audit(1785823718.239:73): 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 [ 25.295809][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.295822][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.424635][ T298] Call Trace: [ 25.427902][ T298] pppol2tp_release+0x150/0x2b0 [ 25.432795][ T298] sock_close+0xb8/0x200 [ 25.437022][ T298] ? sock_mmap+0xa0/0xa0 [ 25.441264][ T298] __fput+0x2dc/0x730 [ 25.445227][ T298] ____fput+0x15/0x20 [ 25.449208][ T298] task_work_run+0x127/0x190 [ 25.453783][ T298] do_exit+0xa7c/0x24e0 [ 25.457913][ T298] ? __kasan_check_write+0x14/0x20 [ 25.463029][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.468122][ T298] ? put_task_struct+0x90/0x90 [ 25.472883][ T298] ? fpu__clear_all+0x20/0x20 [ 25.477540][ T298] ? __kasan_check_read+0x11/0x20 [ 25.482560][ T298] __x64_sys_exit+0x40/0x40 [ 25.487048][ T298] do_syscall_64+0x31/0x40 [ 25.491484][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.497357][ T298] RIP: 0033:0x7f85f23a3d79 [ 25.502202][ T298] Code: Unable to access opcode bytes at RIP 0x7f85f23a3d4f. [ 25.509564][ T298] RSP: 002b:00007ffe84ebe9e8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.517965][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f85f23a3d79 [ 25.525950][ T298] RDX: 00007f85f23b5557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.534007][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.541974][