ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2454433276 <...> syzkaller syzkaller login: [ 15.201688][ T24] kauditd_printk_skb: 26 callbacks suppressed [ 15.201701][ T24] audit: type=1400 audit(1788464709.980:59): avc: denied { transition } for pid=217 comm="sshd-session" path="/bin/sh" dev="sda1" ino=90 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 15.213007][ T24] audit: type=1400 audit(1788464709.980:60): avc: denied { noatsecure } for pid=217 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 15.220584][ T24] audit: type=1400 audit(1788464709.990:61): avc: denied { write } for pid=217 comm="sh" path="pipe:[1415]" dev="pipefs" ino=1415 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 15.240926][ T24] audit: type=1400 audit(1788464709.990:62): avc: denied { rlimitinh } for pid=217 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 15.259718][ T24] audit: type=1400 audit(1788464709.990:63): 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 '10.128.1.149' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2454433276", ["ci2-android-5-10/syz-executor2454433276"], 0x7fff65710b40 /* 10 vars */) = 0 brk(NULL) = 0x55555dc4b000 brk(0x55555dc4bd40) = 0x55555dc4bd40 arch_prctl(ARCH_SET_FS, 0x55555dc4b3c0) = 0 set_tid_address(0x55555dc4b690) = 297 set_robust_list(0x55555dc4b6a0, 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-executor2454433276", 4096) = 45 getrandom("\xc3\x24\xea\x34\xcb\xaa\x4e\x34", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555dc4bd40 brk(0x55555dc6cd40) = 0x55555dc6cd40 brk(0x55555dc6d000) = 0x55555dc6d000 mprotect(0x7f55bbe5b000, 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 +++ [ 25.664294][ T24] audit: type=1400 audit(1788464720.440:64): avc: denied { execmem } for pid=297 comm="syz-executor245" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.683950][ T24] audit: type=1400 audit(1788464720.440:65): avc: denied { create } for pid=297 comm="syz-executor245" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.704205][ T24] audit: type=1400 audit(1788464720.440:66): avc: denied { connect } for pid=297 comm="syz-executor245" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.724141][ T24] audit: type=1400 audit(1788464720.470:67): avc: denied { ioctl } for pid=297 comm="syz-executor245" path="socket:[14564]" dev="sockfs" ino=14564 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.855323][ T298] ================================================================== [ 25.863474][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.871552][ T298] Read of size 4 at addr ffff88810adfdc00 by task syz-executor245/298 [ 25.879710][ T298] [ 25.882057][ T298] CPU: 1 PID: 298 Comm: syz-executor245 Not tainted syzkaller #0 [ 25.889785][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.899991][ T298] Call Trace: [ 25.903327][ T298] __dump_stack+0x21/0x24 [ 25.907694][ T298] dump_stack_lvl+0x1a7/0x208 [ 25.912394][ T298] ? show_regs_print_info+0x18/0x18 [ 25.917604][ T298] ? thaw_kernel_threads+0x220/0x220 [ 25.922916][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 25.928138][ T298] print_address_description+0x7f/0x2c0 [ 25.933688][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.939499][ T298] kasan_report+0x100/0x140 [ 25.944008][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.949724][ T298] __asan_report_load4_noabort+0x14/0x20 [ 25.955615][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 25.961173][ T298] pppol2tp_release+0x150/0x2b0 [ 25.966050][ T298] sock_close+0xb8/0x200 [ 25.970298][ T298] ? sock_mmap+0xa0/0xa0 [ 25.974543][ T298] __fput+0x2dc/0x730 [ 25.978526][ T298] ____fput+0x15/0x20 [ 25.982547][ T298] task_work_run+0x127/0x190 [ 25.987141][ T298] do_exit+0xa7c/0x24e0 [ 25.991303][ T298] ? __kasan_check_write+0x14/0x20 [ 25.996427][ T298] ? switch_fpu_return+0x19c/0x330 [ 26.001677][ T298] ? put_task_struct+0x90/0x90 [ 26.006593][ T298] ? fpu__clear_all+0x20/0x20 [ 26.011282][ T298] ? __kasan_check_read+0x11/0x20 [ 26.016321][ T298] __x64_sys_exit+0x40/0x40 [ 26.020836][ T298] do_syscall_64+0x31/0x40 [ 26.025258][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.031159][ T298] RIP: 0033:0x7f55bbdcad79 [ 26.035575][ T298] Code: Unable to access opcode bytes at RIP 0x7f55bbdcad4f. [ 26.042950][ T298] RSP: 002b:00007fff352def78 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.051366][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f55bbdcad79 [ 26.059345][ T298] RDX: 00007f55bbddc557 RSI: 0000000000000000 RDI: 0000000000000000 [ 26.067326][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 26.075307][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff352df198 [ 26.083282][ T298] R13: 0000000000000002 R14: 00007f55bbe5bca0 R15: 0000000000000002 [ 26.091253][ T298] [ 26.093590][ T298] Allocated by task 297: [ 26.097848][ T298] __kasan_kmalloc+0xd4/0x100 [ 26.102525][ T298] __kmalloc+0x19f/0x330 [ 26.106773][ T298] l2tp_session_create+0x39/0xb60 [ 26.111828][ T298] pppol2tp_connect+0xbf5/0x1640 [ 26.116771][ T298] __sys_connect+0x3ce/0x450 [ 26.121361][ T298] __x64_sys_connect+0x7a/0x90 [ 26.126308][ T298] do_syscall_64+0x31/0x40 [ 26.130729][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.136620][ T298] [ 26.138954][ T298] Freed by task 48: [ 26.142772][ T298] kasan_set_track+0x4a/0x70 [ 26.147367][ T298] kasan_set_free_info+0x23/0x40 [ 26.152317][ T298] ____kasan_slab_free+0x125/0x160 [ 26.157437][ T298] __kasan_slab_free+0x11/0x20 [ 26.162207][ T298] slab_free_freelist_hook+0xc5/0x190 [ 26.167585][ T298] kfree+0xc0/0x270 [ 26.171396][ T298] l2tp_session_put+0xb2/0x1a0 [ 26.176158][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 26.181313][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 26.186611][ T298] process_one_work+0x6fd/0xbc0 [ 26.191468][ T298] worker_thread+0xa8e/0x13c0 [ 26.196157][ T298] kthread+0x324/0x3b0 [ 26.200250][ T298] ret_from_fork+0x1f/0x30 [ 26.204671][ T298] [ 26.207004][ T298] Last potentially related work creation: [ 26.212755][ T298] kasan_save_stack+0x3a/0x60 [ 26.217443][ T298] __kasan_record_aux_stack+0xd2/0x100 [ 26.222909][ T298] kasan_record_aux_stack_noalloc+0xb/0x10 [ 26.228807][ T298] call_rcu+0x11a/0x1090 [ 26.233056][ T298] blkg_release+0x23/0x30 [ 26.237392][ T298] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 26.243551][ T298] rcu_do_batch+0x488/0xaf0 [ 26.248057][ T298] rcu_core+0x50a/0xca0 [ 26.252221][ T298] rcu_core_si+0x9/0x10 [ 26.256389][ T298] __do_softirq+0x255/0x563 [ 26.260911][ T298] [ 26.263255][ T298] The buggy address belongs to the object at ffff88810adfdc00 [ 26.263255][ T298] which belongs to the cache kmalloc-512 of size 512 [ 26.277833][ T298] The buggy address is located 0 bytes inside of [ 26.277833][ T298] 512-byte region [ffff88810adfdc00, ffff88810adfde00) [ 26.290934][ T298] The buggy address belongs to the page: [ 26.296620][ T298] page:ffffea00042b7f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10adfc [ 26.306881][ T298] head:ffffea00042b7f00 order:2 compound_mapcount:0 compound_pincount:0 [ 26.315241][ T298] flags: 0x4000000000010200(slab|head) [ 26.320712][ T298] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 26.329305][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.337897][ T298] page dumped because: kasan: bad access detected [ 26.344342][ T298] page_owner tracks the page as allocated [ 26.350090][ 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 2477240454, free_ts 0 [ 26.367988][ T298] prep_new_page+0x176/0x190 [ 26.372593][ T298] get_page_from_freelist+0x225f/0x23f0 [ 26.378147][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 26.383526][ T298] new_slab+0x84/0x3f0 [ 26.387623][ T298] ___slab_alloc+0x2f8/0x4c0 [ 26.392227][ T298] __slab_alloc+0x63/0xa0 [ 26.396572][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 26.401972][ T298] blkg_alloc+0x6d/0x570 [ 26.406219][ T298] blkcg_init_queue+0x2d/0x330 [ 26.410996][ T298] blk_alloc_queue+0x444/0x5f0 [ 26.416058][ T298] blk_mq_init_queue+0x37/0xd0 [ 26.420833][ T298] scsi_mq_alloc_queue+0x42/0x140 [ 26.425860][ T298] scsi_alloc_sdev+0x611/0x920 [ 26.430651][ T298] scsi_probe_and_add_lun+0x17d/0x3370 [ 26.436119][ T298] __scsi_scan_target+0x1d2/0xbf0 [ 26.441418][ T298] scsi_scan_host_selected+0x34e/0x600 [ 26.446961][ T298] page_owner free stack trace missing [ 26.452337][ T298] [ 26.454670][ T298] Memory state around the buggy address: [ 26.460315][ T298] ffff88810adfdb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.468392][ T298] ffff88810adfdb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.476475][ T298] >ffff88810adfdc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.484554][ T298] ^ [ 26.488644][ T298] ffff88810adfdc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.496741][ T298] ffff88810adfdd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.504805][ T298] ================================================================== [ 26.512894][ T298] Disabling lock debugging due to kernel taint [ 26.519521][ T298] ------------[ cut here ]------------ [ 26.525084][ T298] WARNING: CPU: 1 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 26.535198][ T24] audit: type=1400 audit(1788464721.310:68): 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 [ 26.537541][ T298] Modules linked in: [ 26.556866][ T24] audit: type=1400 audit(1788464721.310:69): 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 [ 26.556879][ T298] [ 26.560809][ T24] audit: type=1400 audit(1788464721.310:70): 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 [ 26.560846][ T24] audit: type=1400 audit(1788464721.310:71): 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 [ 26.583007][ T298] CPU: 0 PID: 298 Comm: syz-executor245 Tainted: G B syzkaller #0 [ 26.584435][ T24] audit: type=1400 audit(1788464721.310:72): 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 [ 26.606257][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 26.626070][ T24] audit: type=1400 audit(1788464721.310:73): 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 [ 26.688852][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 26.695183][ T298] Code: 5d c3 e8 cc 72 35 fd be 02 00 00 00 eb 0a e8 c0 72 35 fd be 01 00 00 00 4c 89 f7 e8 33 df 0e fe e9 0f ff ff ff e8 a9 72 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 98 72 35 fd 4c 89 f7 be 03 [ 26.714850][ T298] RSP: 0018:ffffc90000ad7c40 EFLAGS: 00010293 [ 26.720998][ T298] RAX: ffffffff842f4207 RBX: ffff88810b338800 RCX: ffff88811b7ccf00 [ 26.729031][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 26.737020][ T298] RBP: ffffc90000ad7c60 R08: 0000000000000003 R09: 0000000000000004 [ 26.745066][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 26.753074][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810adfdc00 [ 26.761106][ T298] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 26.770062][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.776661][ T298] CR2: 00007f55bbddc4f0 CR3: 000000010cfbd000 CR4: 00000000003506a0 [ 26.784702][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.792705][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.800756][ T298] Call Trace: [ 26.804084][ T298] pppol2tp_release+0x150/0x2b0 [ 26.808984][ T298] sock_close+0xb8/0x200 [ 26.813251][ T298] ? sock_mmap+0xa0/0xa0 [ 26.817549][ T298] __fput+0x2dc/0x730 [ 26.821555][ T298] ____fput+0x15/0x20 [ 26.825555][ T298] task_work_run+0x127/0x190 [ 26.830200][ T298] do_exit+0xa7c/0x24e0 [ 26.834385][ T298] ? __kasan_check_write+0x14/0x20 [ 26.839566][ T298] ? switch_fpu_return+0x19c/0x330 [ 26.844703][ T298] ? put_task_struct+0x90/0x90 [ 26.849525][ T298] ? fpu__clear_all+0x20/0x20 [ 26.854226][ T298] ? __kasan_check_read+0x11/0x20 [ 26.859307][ T298] __x64_sys_exit+0x40/0x40 [ 26.863827][ T298] do_syscall_64+0x31/0x40 [ 26.868421][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.874342][ T298] RIP: 0033:0x7f55bbdcad79 [ 26.878805][ T298] Code: Unable to access opcode bytes at RIP 0x7f55bbdcad4f. [ 26.886192][ T298] RSP: 002b:00007fff352def78 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 26.894853][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f55bbdcad79 [ 26.902875][ T298] RDX: 00007f55bbddc557 RSI: 0000000000000000 RDI: 00000000000