ci2-android-5-15/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-15/syz-executor2381245624
<...>
syzkaller
syzkaller login: [ 11.214107][ T30] kauditd_printk_skb: 48 callbacks suppressed
[ 11.214120][ T30] audit: type=1400 audit(1789258299.483:59): avc: denied { transition } for pid=221 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
[ 11.219037][ T30] audit: type=1400 audit(1789258299.483:60): avc: denied { noatsecure } for pid=221 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 11.222549][ T30] audit: type=1400 audit(1789258299.483:61): avc: denied { write } for pid=221 comm="sh" path="pipe:[1434]" dev="pipefs" ino=1434 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1
[ 11.227170][ T30] audit: type=1400 audit(1789258299.483:62): avc: denied { rlimitinh } for pid=221 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 11.231132][ T30] audit: type=1400 audit(1789258299.483:63): avc: denied { siginh } for pid=221 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
Warning: Permanently added '10.128.0.193' (ED25519) to the list of known hosts.
execve("ci2-android-5-15/syz-executor2381245624", ["ci2-android-5-15/syz-executor2381245624"], 0x7ffcb79d8e00 /* 10 vars */) = 0
brk(NULL) = 0x555567ea3000
brk(0x555567ea3d40) = 0x555567ea3d40
arch_prctl(ARCH_SET_FS, 0x555567ea33c0) = 0
set_tid_address(0x555567ea3690) = 303
set_robust_list(0x555567ea36a0, 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-5-15/syz-executor2381245624", 4096) = 45
getrandom("\xcb\x51\x17\x6f\x0e\xc3\x4b\x24", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x555567ea3d40
brk(0x555567ec4d40) = 0x555567ec4d40
brk(0x555567ec5000) = 0x555567ec5000
mprotect(0x7fa722c9a000, 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) = 304
ioctl(3, PPPIOCGFLAGS, 0) = -1 ENOSYS (Function not implemented)
exit_group(0) = ?
+++ exited with 0 +++
[ 20.356007][ T30] audit: type=1400 audit(1789258308.623:64): avc: denied { execmem } for pid=303 comm="syz-executor238" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 20.360322][ T30] audit: type=1400 audit(1789258308.633:65): avc: denied { create } for pid=303 comm="syz-executor238" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 20.363966][ T30] audit: type=1400 audit(1789258308.633:66): avc: denied { connect } for pid=303 comm="syz-executor238" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 20.368491][ T30] audit: type=1400 audit(1789258308.633:67): avc: denied { ioctl } for pid=303 comm="syz-executor238" path="socket:[14967]" dev="sockfs" ino=14967 ioctlcmd=0x745a scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 20.518796][ T304] ==================================================================
[ 20.526880][ T304] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0
[ 20.534937][ T304] Read of size 4 at addr ffff888100ba1400 by task syz-executor238/304
[ 20.543059][ T304]
[ 20.545365][ T304] CPU: 1 PID: 304 Comm: syz-executor238 Not tainted syzkaller #0
[ 20.553054][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 20.563093][ T304] Call Trace:
[ 20.566347][ T304]
[ 20.569251][ T304] __dump_stack+0x21/0x30
[ 20.573556][ T304] dump_stack_lvl+0x110/0x170
[ 20.578207][ T304] ? show_regs_print_info+0x20/0x20
[ 20.583379][ T304] ? load_image+0x3f0/0x3f0
[ 20.587856][ T304] ? __local_bh_enable_ip+0x58/0x80
[ 20.593048][ T304] print_address_description+0x7f/0x2c0
[ 20.598568][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 20.604258][ T304] kasan_report+0x10f/0x150
[ 20.608734][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 20.614424][ T304] __asan_report_load4_noabort+0x14/0x20
[ 20.620033][ T304] pppol2tp_sock_to_session+0x1a0/0x1b0
[ 20.625571][ T304] pppol2tp_release+0x150/0x2b0
[ 20.630395][ T304] sock_close+0xb8/0x200
[ 20.634613][ T304] ? sock_mmap+0xa0/0xa0
[ 20.638827][ T304] __fput+0x22b/0x900
[ 20.642802][ T304] ____fput+0x15/0x20
[ 20.646756][ T304] task_work_run+0x127/0x190
[ 20.651316][ T304] do_exit+0xb70/0x29a0
[ 20.655449][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 20.661146][ T304] ? put_task_struct+0x90/0x90
[ 20.665882][ T304] ? __kasan_check_write+0x14/0x20
[ 20.670965][ T304] __x64_sys_exit+0x40/0x40
[ 20.675444][ T304] x64_sys_call+0x44/0x9a0
[ 20.679832][ T304] do_syscall_64+0x4c/0xa0
[ 20.684221][ T304] ? clear_bhb_loop+0x50/0xa0
[ 20.688869][ T304] ? clear_bhb_loop+0x50/0xa0
[ 20.693517][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 20.699399][ T304] RIP: 0033:0x7fa722c09d79
[ 20.703788][ T304] Code: Unable to access opcode bytes at RIP 0x7fa722c09d4f.
[ 20.711122][ T304] RSP: 002b:00007ffd6767a158 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 20.719512][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fa722c09d79
[ 20.727455][ T304] RDX: 00007fa722c1b557 RSI: 0000000000000000 RDI: 0000000000000000
[ 20.735401][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 20.743348][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd6767a378
[ 20.751299][ T304] R13: 0000000000000002 R14: 00007fa722c9aca0 R15: 0000000000000002
[ 20.759246][ T304]
[ 20.762241][ T304]
[ 20.764539][ T304] Allocated by task 303:
[ 20.768751][ T304] __kasan_kmalloc+0xd4/0x100
[ 20.773404][ T304] __kmalloc+0x13d/0x2c0
[ 20.777619][ T304] l2tp_session_create+0x39/0xb60
[ 20.782613][ T304] pppol2tp_connect+0xbf5/0x1640
[ 20.787522][ T304] __sys_connect+0x3cb/0x450
[ 20.792082][ T304] __x64_sys_connect+0x7a/0x90
[ 20.796835][ T304] x64_sys_call+0x7c/0x9a0
[ 20.801223][ T304] do_syscall_64+0x4c/0xa0
[ 20.805610][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 20.811489][ T304]
[ 20.813785][ T304] Freed by task 8:
[ 20.817471][ T304] kasan_set_track+0x4a/0x70
[ 20.822031][ T304] kasan_set_free_info+0x23/0x40
[ 20.826941][ T304] ____kasan_slab_free+0x125/0x160
[ 20.832023][ T304] __kasan_slab_free+0x11/0x20
[ 20.836755][ T304] slab_free_freelist_hook+0xc2/0x190
[ 20.842096][ T304] kfree+0xc4/0x270
[ 20.845875][ T304] l2tp_session_put+0xaf/0x1a0
[ 20.850610][ T304] l2tp_session_delete+0x3a9/0x4a0
[ 20.855696][ T304] l2tp_tunnel_del_work+0x180/0x3d0
[ 20.860864][ T304] process_one_work+0x6c8/0xbb0
[ 20.865690][ T304] worker_thread+0xaa0/0x1250
[ 20.870340][ T304] kthread+0x3f5/0x4f0
[ 20.874383][ T304] ret_from_fork+0x1f/0x30
[ 20.878770][ T304]
[ 20.881066][ T304] Last potentially related work creation:
[ 20.886751][ T304] kasan_save_stack+0x3a/0x60
[ 20.891400][ T304] __kasan_record_aux_stack+0xd2/0x100
[ 20.896828][ T304] kasan_record_aux_stack_noalloc+0xb/0x10
[ 20.902605][ T304] call_rcu+0x10b/0xf60
[ 20.906733][ T304] blkg_release+0x23/0x30
[ 20.911032][ T304] percpu_ref_switch_to_atomic_rcu+0x611/0x620
[ 20.917158][ T304] rcu_do_batch+0x4c1/0xbf0
[ 20.921630][ T304] rcu_core+0x4a3/0xef0
[ 20.925760][ T304] rcu_core_si+0x9/0x10
[ 20.929898][ T304] handle_softirqs+0x250/0x560
[ 20.934637][ T304] run_ksoftirqd+0x28/0x40
[ 20.939025][ T304] smpboot_thread_fn+0x446/0x880
[ 20.943932][ T304] kthread+0x3f5/0x4f0
[ 20.947973][ T304] ret_from_fork+0x1f/0x30
[ 20.952370][ T304]
[ 20.954666][ T304] The buggy address belongs to the object at ffff888100ba1400
[ 20.954666][ T304] which belongs to the cache kmalloc-512 of size 512
[ 20.968704][ T304] The buggy address is located 0 bytes inside of
[ 20.968704][ T304] 512-byte region [ffff888100ba1400, ffff888100ba1600)
[ 20.981778][ T304] The buggy address belongs to the page:
[ 20.987391][ T304] page:ffffea000402e800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x100ba0
[ 20.997619][ T304] head:ffffea000402e800 order:2 compound_mapcount:0 compound_pincount:0
[ 21.005916][ T304] flags: 0x4000000000010200(slab|head|zone=1)
[ 21.011972][ T304] raw: 4000000000010200 ffffea000402e700 0000000400000004 ffff888100042f00
[ 21.020530][ T304] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 21.029081][ T304] page dumped because: kasan: bad access detected
[ 21.035464][ T304] page_owner tracks the page as allocated
[ 21.041158][ T304] 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 1864700276, free_ts 0
[ 21.059014][ T304] post_alloc_hook+0x192/0x1b0
[ 21.063757][ T304] prep_new_page+0x1c/0x110
[ 21.068237][ T304] get_page_from_freelist+0x2c3a/0x2cd0
[ 21.073758][ T304] __alloc_pages+0x1a2/0x460
[ 21.078320][ T304] new_slab+0xa0/0x4d0
[ 21.082356][ T304] ___slab_alloc+0x3ac/0x840
[ 21.086939][ T304] __slab_alloc+0x49/0x90
[ 21.091252][ T304] kmem_cache_alloc_trace+0x146/0x270
[ 21.096603][ T304] blkg_alloc+0x82/0x5d0
[ 21.100832][ T304] blkcg_init_queue+0x29/0x210
[ 21.105566][ T304] blk_alloc_queue+0x3be/0x550
[ 21.110303][ T304] blk_mq_init_queue+0x37/0xd0
[ 21.115042][ T304] scsi_alloc_sdev+0x66c/0x9c0
[ 21.119779][ T304] scsi_probe_and_add_lun+0x180/0x35d0
[ 21.125209][ T304] __scsi_scan_target+0x1d2/0xb70
[ 21.130205][ T304] scsi_scan_host_selected+0x34e/0x600
[ 21.135637][ T304] page_owner free stack trace missing
[ 21.140980][ T304]
[ 21.143288][ T304] Memory state around the buggy address:
[ 21.148900][ T304] ffff888100ba1300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 21.156937][ T304] ffff888100ba1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 21.164973][ T304] >ffff888100ba1400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.173030][ T304] ^
[ 21.177094][ T304] ffff888100ba1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.185127][ T304] ffff888100ba1500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 21.193164][ T304] ==================================================================
[ 21.201196][ T304] Disabling lock debugging due to kernel taint
[ 21.207796][ T304] ------------[ cut here ]------------
[ 21.213757][ T304] WARNING: CPU: 1 PID: 304 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0
[ 21.224011][ T304] Modules linked in:
[ 21.225939][ T30] audit: type=1400 audit(1789258309.493:68): avc: denied { read } for pid=83 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
[ 21.227928][ T304] CPU: 1 PID: 304 Comm: syz-executor238 Tainted: G B syzkaller #0
[ 21.250782][ T30] audit: type=1400 audit(1789258309.493:69): avc: denied { search } for pid=83 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
[ 21.258745][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 21.279978][ T30] audit: type=1400 audit(1789258309.493:70): avc: denied { write } for pid=83 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
[ 21.289869][ T304] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0
[ 21.311016][ T30] audit: type=1400 audit(1789258309.493:71): avc: denied { add_name } for pid=83 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1
[ 21.317421][ T304] Code: 5d c3 e8 0c f9 0a fd be 02 00 00 00 eb 0a e8 00 f9 0a fd be 01 00 00 00 4c 89 f7 e8 03 69 f1 fd e9 0f ff ff ff e8 e9 f8 0a fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 d8 f8 0a fd 4c 89 f7 be 03
[ 21.337775][ T30] audit: type=1400 audit(1789258309.493:72): avc: denied { create } for pid=83 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1
[ 21.357375][ T304] RSP: 0018:ffffc90000967bf0 EFLAGS: 00010293
[ 21.377690][ T30] audit: type=1400 audit(1789258309.493:73): avc: denied { append open } for pid=83 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
[ 21.383779][ T304] RAX: ffffffff845eceb7 RBX: ffff888104d9d000 RCX: ffff888124a313c0
[ 21.414396][ T304] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d
[ 21.422391][ T304] RBP: ffffc90000967c10 R08: 0000000000000003 R09: 0000000000000004
[ 21.430367][ T304] R10: dffffc0000000000 R11: fffffbfff0e18e4c R12: dffffc0000000000
[ 21.438317][ T304] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888100ba1400
[ 21.446287][ T304] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
[ 21.455243][ T304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 21.461840][ T304] CR2: 000000000062b5d8 CR3: 000000010d70d000 CR4: 00000000003506a0
[ 21.469838][ T304] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 21.477787][ T304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 21.485765][ T304] Call Trace:
[ 21.489031][ T304]
[ 21.491961][ T304] pppol2tp_release+0x150/0x2b0
[ 21.496808][ T304] sock_close+0xb8/0x200
[ 21.501050][ T304] ? sock_mmap+0xa0/0xa0
[ 21.505296][ T304] __fput+0x22b/0x900
[ 21.509254][ T304] ____fput+0x15/0x20
[ 21.513231][ T304] task_work_run+0x127/0x190
[ 21.517812][ T304] do_exit+0xb70/0x29a0
[ 21.521967][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 21.527679][ T304] ? put_task_struct+0x90/0x90
[ 21.532446][ T304] ? __kasan_check_write+0x14/0x20
[ 21.537565][ T304] __x64_sys_exit+0x40/0x40
[ 21.542072][ T304] x64_sys_call+0x44/0x9a0
[ 21.546478][ T304] do_syscall_64+0x4c/0xa0
[ 21.550891][ T304] ? clear_bhb_loop+0x50/0xa0
[ 21.555559][ T304] ? clear_bhb_loop+0x50/0xa0
[ 21.560236][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 21.566124][ T304] RIP: 0033:0x7fa722c09d79
[ 21.570536][ T304] Code: Unable to access opcode bytes at RIP 0x7fa722c09d4f.
[ 21.577884][ T304] RSP: 002b:00007ffd6767a158 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 21.586295][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fa722c09d79
[ 21.594275][ T304] RDX: 00007fa722c1b557 RSI: 0000000000000000 RDI: 0000000000000000
[ 21.602238][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 21.610229][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd6767a378
[ 21.618174][ T304] R13: 0000000000000002 R14: 00007fa722c9aca