[ 35.769021] audit: type=1800 audit(1584781943.122:33): pid=7338 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 35.795588] audit: type=1800 audit(1584781943.132:34): pid=7338 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 37.627255] random: sshd: uninitialized urandom read (32 bytes read) [ 37.863880] audit: type=1400 audit(1584781945.222:35): avc: denied { map } for pid=7511 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 37.915896] random: sshd: uninitialized urandom read (32 bytes read) [ 38.674173] random: sshd: uninitialized urandom read (32 bytes read) [ 38.876857] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.109' (ECDSA) to the list of known hosts. [ 44.452453] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 44.575716] audit: type=1400 audit(1584781951.932:36): avc: denied { map } for pid=7523 comm="syz-executor775" path="/root/syz-executor775765992" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 44.650297] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 44.658832] IP: l2tp_session_free+0x113/0x200 [ 44.663311] PGD 0 P4D 0 [ 44.665964] Oops: 0002 [#1] PREEMPT SMP KASAN [ 44.670455] Modules linked in: [ 44.673633] CPU: 0 PID: 7525 Comm: syz-executor775 Not tainted 4.14.174-syzkaller #0 [ 44.681491] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.690858] task: ffff8880a946c180 task.stack: ffff888088d88000 [ 44.697014] RIP: 0010:l2tp_session_free+0x113/0x200 [ 44.702014] RSP: 0018:ffff888088d8fbc0 EFLAGS: 00010246 [ 44.707361] RAX: dffffc0000000000 RBX: ffff8880a67842c0 RCX: 0000000000000000 [ 44.714625] RDX: 1ffff11014cf0889 RSI: ffff8880a946ca00 RDI: ffff8880a6784448 [ 44.721875] RBP: ffff88809903dac0 R08: 0000000000000001 R09: 0000000000000000 [ 44.729140] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809903dad0 [ 44.736392] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88809b4a4290 [ 44.743655] FS: 00000000017a9880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 [ 44.751859] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.757733] CR2: 0000000000000080 CR3: 0000000007c6a000 CR4: 00000000001406f0 [ 44.765008] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.772272] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.782917] Call Trace: [ 44.785526] pppol2tp_session_destruct+0xcd/0x110 [ 44.790364] ? pppol2tp_seq_start+0x4e0/0x4e0 [ 44.794864] __sk_destruct+0x49/0x640 [ 44.798688] sk_destruct+0x97/0xc0 [ 44.802247] __sk_free+0x4c/0x220 [ 44.806492] sk_free+0x2b/0x40 [ 44.809845] pppol2tp_release+0x247/0x2f0 [ 44.813985] __sock_release+0xcd/0x2b0 [ 44.817859] ? __sock_release+0x2b0/0x2b0 [ 44.822002] sock_close+0x15/0x20 [ 44.825442] __fput+0x25f/0x790 [ 44.828710] task_work_run+0x113/0x190 [ 44.832589] do_exit+0x9f2/0x2b00 [ 44.836027] ? __do_page_fault+0x4e4/0xb40 [ 44.840257] ? mm_update_next_owner+0x5b0/0x5b0 [ 44.844923] ? lock_downgrade+0x6e0/0x6e0 [ 44.849054] do_group_exit+0x100/0x310 [ 44.852932] SyS_exit_group+0x19/0x20 [ 44.856772] ? do_group_exit+0x310/0x310 [ 44.860857] do_syscall_64+0x1d5/0x640 [ 44.864731] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 44.870030] RIP: 0033:0x43ff48 [ 44.873239] RSP: 002b:00007fff68d6a498 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 44.880930] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ff48 [ 44.888184] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 44.895434] RBP: 00000000004bf7d0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 44.902693] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 44.910013] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 44.917325] Code: 97 fb 48 8d bb 88 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d2 00 00 00 4c 8b ab 88 01 00 00 41 ff 8d 80 00 00 00 0f 88 24 80 7b 00 74 70 e8 b8 d9 97 fb [ 44.936431] RIP: l2tp_session_free+0x113/0x200 RSP: ffff888088d8fbc0 [ 44.942916] CR2: 0000000000000080 [ 44.946368] ---[ end trace d8b0b59e1be263bf ]--- [ 44.951103] Kernel panic - not syncing: Fatal exception [ 44.957615] Kernel Offset: disabled [ 44.961249] Rebooting in 86400 seconds..