ci2-android-5-15/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-15/syz-executor2570320199
<...>
cess permissive=1
[ 14.683085][ T30] audit: type=1400 audit(1785908910.714:63): avc: denied { siginh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 20.037715][ T238] scp (238) used greatest stack depth: 20704 bytes left
Warning: Permanently added '10.128.0.4' (ED25519) to the list of known hosts.
execve("ci2-android-5-15/syz-executor2570320199", ["ci2-android-5-15/syz-executor2570320199"], 0x7ffd8355d4f0 /* 10 vars */) = 0
brk(NULL) = 0x55556f115000
brk(0x55556f115d40) = 0x55556f115d40
arch_prctl(ARCH_SET_FS, 0x55556f1153c0) = 0
set_tid_address(0x55556f115690) = 303
set_robust_list(0x55556f1156a0, 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-executor2570320199", 4096) = 45
getrandom("\x7d\xc9\x5c\x5a\xae\xc6\x0c\xad", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55556f115d40
brk(0x55556f136d40) = 0x55556f136d40
brk(0x55556f137000) = 0x55556f137000
mprotect(0x7fdc9303e000, 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) = 304
ioctl(3, EXT4_IOC_GETFSUUID, 0) = -1 ENOTTY (Inappropriate ioctl for device)
exit_group(0) = ?
+++ exited with 0 +++
[ 28.107126][ T30] audit: type=1400 audit(1785908924.184:64): avc: denied { execmem } for pid=303 comm="syz-executor257" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 28.126907][ T30] audit: type=1400 audit(1785908924.194:65): avc: denied { create } for pid=303 comm="syz-executor257" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 28.147940][ T30] audit: type=1400 audit(1785908924.194:66): avc: denied { connect } for pid=303 comm="syz-executor257" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 28.167869][ T30] audit: type=1400 audit(1785908924.214:67): avc: denied { ioctl } for pid=303 comm="syz-executor257" path="socket:[15001]" dev="sockfs" ino=15001 ioctlcmd=0x662c scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 28.298888][ T304] ==================================================================
[ 28.306987][ T304] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0
[ 28.315087][ T304] Read of size 4 at addr ffff88810ae1dc00 by task syz-executor257/304
[ 28.323246][ T304]
[ 28.325611][ T304] CPU: 0 PID: 304 Comm: syz-executor257 Not tainted syzkaller #0
[ 28.333343][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 28.343565][ T304] Call Trace:
[ 28.346844][ T304]
[ 28.349795][ T304] __dump_stack+0x21/0x30
[ 28.354130][ T304] dump_stack_lvl+0x110/0x170
[ 28.358818][ T304] ? show_regs_print_info+0x20/0x20
[ 28.364017][ T304] ? load_image+0x3f0/0x3f0
[ 28.368523][ T304] ? __local_bh_enable_ip+0x58/0x80
[ 28.373720][ T304] print_address_description+0x7f/0x2c0
[ 28.379267][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 28.384998][ T304] kasan_report+0x10f/0x150
[ 28.389499][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 28.395216][ T304] __asan_report_load4_noabort+0x14/0x20
[ 28.400870][ T304] pppol2tp_sock_to_session+0x1a0/0x1b0
[ 28.406430][ T304] pppol2tp_release+0x150/0x2b0
[ 28.411280][ T304] sock_close+0xb8/0x200
[ 28.415520][ T304] ? sock_mmap+0xa0/0xa0
[ 28.419785][ T304] __fput+0x22b/0x900
[ 28.423765][ T304] ____fput+0x15/0x20
[ 28.427759][ T304] task_work_run+0x127/0x190
[ 28.432376][ T304] do_exit+0xb70/0x29a0
[ 28.436539][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 28.442260][ T304] ? put_task_struct+0x90/0x90
[ 28.447025][ T304] ? __kasan_check_write+0x14/0x20
[ 28.452137][ T304] __x64_sys_exit+0x40/0x40
[ 28.456648][ T304] x64_sys_call+0x44/0x9a0
[ 28.461065][ T304] do_syscall_64+0x4c/0xa0
[ 28.465482][ T304] ? clear_bhb_loop+0x50/0xa0
[ 28.470156][ T304] ? clear_bhb_loop+0x50/0xa0
[ 28.474847][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 28.480738][ T304] RIP: 0033:0x7fdc92fadd79
[ 28.485150][ T304] Code: Unable to access opcode bytes at RIP 0x7fdc92fadd4f.
[ 28.492525][ T304] RSP: 002b:00007ffe71e52958 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 28.500944][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fdc92fadd79
[ 28.508912][ T304] RDX: 00007fdc92fbf557 RSI: 0000000000000000 RDI: 0000000000000000
[ 28.516899][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 28.524992][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe71e52b78
[ 28.532971][ T304] R13: 0000000000000002 R14: 00007fdc9303eca0 R15: 0000000000000002
[ 28.540964][ T304]
[ 28.543995][ T304]
[ 28.546314][ T304] Allocated by task 303:
[ 28.550547][ T304] __kasan_kmalloc+0xd4/0x100
[ 28.555226][ T304] __kmalloc+0x13d/0x2c0
[ 28.559471][ T304] l2tp_session_create+0x39/0xb60
[ 28.564668][ T304] pppol2tp_connect+0xbf5/0x1640
[ 28.569613][ T304] __sys_connect+0x3cb/0x450
[ 28.574201][ T304] __x64_sys_connect+0x7a/0x90
[ 28.578977][ T304] x64_sys_call+0x7c/0x9a0
[ 28.583391][ T304] do_syscall_64+0x4c/0xa0
[ 28.587801][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 28.593692][ T304]
[ 28.596011][ T304] Freed by task 8:
[ 28.599722][ T304] kasan_set_track+0x4a/0x70
[ 28.604311][ T304] kasan_set_free_info+0x23/0x40
[ 28.609245][ T304] ____kasan_slab_free+0x125/0x160
[ 28.614351][ T304] __kasan_slab_free+0x11/0x20
[ 28.619113][ T304] slab_free_freelist_hook+0xc2/0x190
[ 28.624478][ T304] kfree+0xc4/0x270
[ 28.628290][ T304] l2tp_session_put+0xaf/0x1a0
[ 28.633054][ T304] l2tp_session_delete+0x3a9/0x4a0
[ 28.638162][ T304] l2tp_tunnel_del_work+0x180/0x3d0
[ 28.643359][ T304] process_one_work+0x6c8/0xbb0
[ 28.648217][ T304] worker_thread+0xaa0/0x1250
[ 28.652913][ T304] kthread+0x3f5/0x4f0
[ 28.656976][ T304] ret_from_fork+0x1f/0x30
[ 28.661391][ T304]
[ 28.663714][ T304] Last potentially related work creation:
[ 28.669426][ T304] kasan_save_stack+0x3a/0x60
[ 28.674106][ T304] __kasan_record_aux_stack+0xd2/0x100
[ 28.679561][ T304] kasan_record_aux_stack_noalloc+0xb/0x10
[ 28.685378][ T304] call_rcu+0x10b/0xf60
[ 28.689531][ T304] blkg_release+0x23/0x30
[ 28.693856][ T304] percpu_ref_switch_to_atomic_rcu+0x611/0x620
[ 28.700010][ T304] rcu_do_batch+0x4c1/0xbf0
[ 28.704510][ T304] rcu_core+0x4a3/0xef0
[ 28.708659][ T304] rcu_core_si+0x9/0x10
[ 28.712825][ T304] handle_softirqs+0x250/0x560
[ 28.717602][ T304] run_ksoftirqd+0x28/0x40
[ 28.722013][ T304] smpboot_thread_fn+0x446/0x880
[ 28.726951][ T304] kthread+0x3f5/0x4f0
[ 28.731020][ T304] ret_from_fork+0x1f/0x30
[ 28.735433][ T304]
[ 28.737881][ T304] The buggy address belongs to the object at ffff88810ae1dc00
[ 28.737881][ T304] which belongs to the cache kmalloc-512 of size 512
[ 28.751940][ T304] The buggy address is located 0 bytes inside of
[ 28.751940][ T304] 512-byte region [ffff88810ae1dc00, ffff88810ae1de00)
[ 28.765200][ T304] The buggy address belongs to the page:
[ 28.770845][ T304] page:ffffea00042b8700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ae1c
[ 28.781255][ T304] head:ffffea00042b8700 order:2 compound_mapcount:0 compound_pincount:0
[ 28.789580][ T304] flags: 0x4000000000010200(slab|head|zone=1)
[ 28.795676][ T304] raw: 4000000000010200 ffffea0004047100 0000000300000003 ffff888100042f00
[ 28.804391][ T304] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 28.812981][ T304] page dumped because: kasan: bad access detected
[ 28.819506][ T304] page_owner tracks the page as allocated
[ 28.825242][ 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 2586010151, free_ts 0
[ 28.843120][ T304] post_alloc_hook+0x192/0x1b0
[ 28.847891][ T304] prep_new_page+0x1c/0x110
[ 28.852392][ T304] get_page_from_freelist+0x2c3a/0x2cd0
[ 28.857941][ T304] __alloc_pages+0x1a2/0x460
[ 28.862556][ T304] new_slab+0xa0/0x4d0
[ 28.866620][ T304] ___slab_alloc+0x3ac/0x840
[ 28.871204][ T304] __slab_alloc+0x49/0x90
[ 28.875548][ T304] kmem_cache_alloc_trace+0x146/0x270
[ 28.880926][ T304] blkg_alloc+0x82/0x5d0
[ 28.885169][ T304] blkcg_init_queue+0x29/0x210
[ 28.889928][ T304] blk_alloc_queue+0x3be/0x550
[ 28.894693][ T304] blk_mq_init_queue+0x37/0xd0
[ 28.899473][ T304] scsi_alloc_sdev+0x66c/0x9c0
[ 28.904238][ T304] scsi_probe_and_add_lun+0x180/0x35d0
[ 28.909690][ T304] __scsi_scan_target+0x1d2/0xb70
[ 28.914714][ T304] scsi_scan_host_selected+0x34e/0x600
[ 28.920185][ T304] page_owner free stack trace missing
[ 28.925553][ T304]
[ 28.927866][ T304] Memory state around the buggy address:
[ 28.933485][ T304] ffff88810ae1db00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 28.941565][ T304] ffff88810ae1db80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 28.949620][ T304] >ffff88810ae1dc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.957668][ T304] ^
[ 28.961729][ T304] ffff88810ae1dc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.969783][ T304] ffff88810ae1dd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 28.977851][ T304] ==================================================================
[ 28.985901][ T304] Disabling lock debugging due to kernel taint
[ 28.992368][ T304] ------------[ cut here ]------------
[ 28.997857][ T304] WARNING: CPU: 0 PID: 304 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0
[ 29.007921][ T304] Modules linked in:
[ 29.011857][ T304] CPU: 0 PID: 304 Comm: syz-executor257 Tainted: G B syzkaller #0
[ 29.019122][ T30] audit: type=1400 audit(1785908925.094:68): 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
[ 29.021025][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 29.043228][ T30] audit: type=1400 audit(1785908925.094:69): 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
[ 29.052738][ T304] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0
[ 29.074404][ T30] audit: type=1400 audit(1785908925.094:70): 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
[ 29.080389][ T304] Code: 5d c3 e8 9c 83 0b fd be 02 00 00 00 eb 0a e8 90 83 0b fd be 01 00 00 00 4c 89 f7 e8 33 02 f2 fd e9 0f ff ff ff e8 79 83 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 68 83 0b fd 4c 89 f7 be 03
[ 29.102196][ T30] audit: type=1400 audit(1785908925.094:71): 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
[ 29.121522][ T304] RSP: 0018:ffffc90000967bf0 EFLAGS: 00010293
[ 29.141769][ T30] audit: type=1400 audit(1785908925.094:72): 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
[ 29.147691][ T304] RAX: ffffffff845e3367 RBX: ffff8881065b1000 RCX: ffff88810b250000
[ 29.168197][ T30] audit: type=1400 audit(1785908925.094:73): 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
[ 29.176604][ T304] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d
[ 29.206806][ T304] RBP: ffffc90000967c10 R08: 0000000000000003 R09: 0000000000000004
[ 29.214821][ T304] R10: dffffc0000000000 R11: fffffbfff0e18e4c R12: dffffc0000000000
[ 29.222830][ T304] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810ae1dc00
[ 29.230890][ T304] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
[ 29.239866][ T304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 29.246455][ T304] CR2: 00007fdc92fbf4f0 CR3: 000000010d7cd000 CR4: 00000000003506b0
[ 29.254490][ T304] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 29.262503][ T304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 29.270531][ T304] Call Trace:
[ 29.273919][ T304]
[ 29.276856][ T304] pppol2tp_release+0x150/0x2b0
[ 29.281757][ T304] sock_close+0xb8/0x200
[ 29.286016][ T304] ? sock_mmap+0xa0/0xa0
[ 29.290392][ T304] __fput+0x22b/0x900
[ 29.294394][ T304] ____fput+0x15/0x20
[ 29.298423][ T304] task_work_run+0x127/0x190
[ 29.303051][ T304] do_exit+0xb70/0x29a0
[ 29.307209][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 29.312976][ T304] ? put_task_struct+0x90/0x90
[ 29.317801][ T304] ? __kasan_check_write+0x14/0x20
[ 29.322963][ T304] __x64_sys_exit+0x40/0x40
[ 29.327489][ T304] x64_sys_call+0x44/0x9a0
[ 29.331944][ T304] do_syscall_64+0x4c/0xa0
[ 29.336377][ T304] ? clear_bhb_loop+0x50/0xa0
[ 29.341095][ T304] ? clear_bhb_loop+0x50/0xa0
[ 29.345790][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 29.351744][ T304] RIP: 0033:0x7fdc92fadd79
[ 29.356177][ T304] Code: Unable to access opcode bytes at RIP 0x7fdc92fadd4f.
[ 29.363597][ T304] RSP: 002b:00007ffe71e52958 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 29.372063][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fdc92fadd79
[ 29.380078][ T304] RDX: 00007fdc92fbf557 RSI: 0000000000000000 RDI: 0000000000000000
[ 29.388095][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 29.396065][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe71e52b7