[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.091336] random: sshd: uninitialized urandom read (32 bytes read) [ 34.395968] kauditd_printk_skb: 9 callbacks suppressed [ 34.395976] audit: type=1400 audit(1567429149.708:35): avc: denied { map } for pid=6854 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 [ 34.446745] random: sshd: uninitialized urandom read (32 bytes read) [ 35.011332] random: sshd: uninitialized urandom read (32 bytes read) [ 35.199748] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.1.59' (ECDSA) to the list of known hosts. [ 40.725302] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.854570] audit: type=1400 audit(1567429156.168:36): avc: denied { map } for pid=6867 comm="syz-executor924" path="/root/syz-executor924321400" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 40.893104] kasan: CONFIG_KASAN_INLINE enabled [ 40.898167] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.905998] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.912478] Modules linked in: [ 40.915656] CPU: 1 PID: 6867 Comm: syz-executor924 Not tainted 4.14.141 #37 [ 40.922733] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.932271] task: ffff8880a6342600 task.stack: ffff88809ef60000 [ 40.938316] RIP: 0010:scatterwalk_copychunks+0x4d6/0x6b0 [ 40.943895] RSP: 0018:ffff88809ef67648 EFLAGS: 00010202 [ 40.949326] RAX: dffffc0000000000 RBX: 0000000000001000 RCX: ffff88808f2431f4 [ 40.956702] RDX: 0000000000000002 RSI: ffff8880a890c000 RDI: ffff88808f2431e8 [ 40.964658] RBP: ffff88809ef676b8 R08: ffffed1010d7a36a R09: 0000000000000002 [ 40.972078] R10: ffffed1010d7a369 R11: ffff888086bd1b4c R12: 0000000000001000 [ 40.979328] R13: 0000000000000000 R14: ffff88809ef67710 R15: 0000000000003000 [ 40.986579] FS: 0000000000f3a880(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 [ 40.994854] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.000722] CR2: 00007ffe8d453ab0 CR3: 000000008fc78000 CR4: 00000000001406e0 [ 41.007970] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.015219] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.022465] Call Trace: [ 41.025035] scatterwalk_map_and_copy+0x12f/0x1d0 [ 41.029942] ? scatterwalk_copychunks+0x6b0/0x6b0 [ 41.034845] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 41.040271] ? rcu_read_lock_sched_held+0x110/0x130 [ 41.045350] ? __kmalloc+0x376/0x7a0 [ 41.049405] ? gcmaes_encrypt.constprop.0+0x143/0xb90 [ 41.055259] gcmaes_encrypt.constprop.0+0x1d2/0xb90 [ 41.060460] ? __lock_is_held+0xb6/0x140 [ 41.064498] ? check_preemption_disabled+0x3c/0x250 [ 41.069505] generic_gcmaes_encrypt+0xf4/0x130 [ 41.074081] ? helper_rfc4106_encrypt+0x320/0x320 [ 41.078931] ? __kmalloc+0x376/0x7a0 [ 41.082645] gcmaes_wrapper_encrypt+0xef/0x150 [ 41.087216] tls_push_record+0x906/0x1210 [ 41.091545] tls_sw_sendpage+0x434/0xb50 [ 41.095597] ? tls_sw_sendmsg+0x1020/0x1020 [ 41.099895] inet_sendpage+0x157/0x580 [ 41.103782] ? tls_sw_sendmsg+0x1020/0x1020 [ 41.108108] kernel_sendpage+0x92/0xf0 [ 41.111978] ? inet_sendmsg+0x500/0x500 [ 41.116023] sock_sendpage+0x8b/0xc0 [ 41.119713] ? kernel_sendpage+0xf0/0xf0 [ 41.123752] pipe_to_sendpage+0x242/0x340 [ 41.127876] ? direct_splice_actor+0x190/0x190 [ 41.132454] ? anon_pipe_buf_release+0x157/0x220 [ 41.137185] __splice_from_pipe+0x348/0x780 [ 41.141481] ? direct_splice_actor+0x190/0x190 [ 41.146036] ? direct_splice_actor+0x190/0x190 [ 41.150592] splice_from_pipe+0xf0/0x150 [ 41.154645] ? splice_shrink_spd+0xb0/0xb0 [ 41.158868] ? security_file_permission+0x89/0x1f0 [ 41.163773] generic_splice_sendpage+0x3c/0x50 [ 41.168336] ? splice_from_pipe+0x150/0x150 [ 41.172733] SyS_splice+0xd92/0x1430 [ 41.176432] ? compat_SyS_vmsplice+0x250/0x250 [ 41.180992] ? do_syscall_64+0x53/0x640 [ 41.184943] ? compat_SyS_vmsplice+0x250/0x250 [ 41.189506] do_syscall_64+0x1e8/0x640 [ 41.193383] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.198353] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 41.203517] RIP: 0033:0x440379 [ 41.206708] RSP: 002b:00007ffc91aa9098 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 41.214389] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440379 [ 41.221657] RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 [ 41.228912] RBP: 00000000006ca018 R08: 0000000100000000 R09: 0000000000000000 [ 41.236174] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401c00 [ 41.243436] R13: 0000000000401c90 R14: 0000000000000000 R15: 0000000000000000 [ 41.252115] Code: 00 00 fc ff df 80 3c 02 00 0f 85 37 01 00 00 49 8d 45 10 4d 89 2e 48 89 c2 48 89 45 c0 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 7d 01 00 00 48 b8 00 00 00 [ 41.271298] RIP: scatterwalk_copychunks+0x4d6/0x6b0 RSP: ffff88809ef67648 [ 41.278836] ---[ end trace 0503b9ef08c715bc ]--- [ 41.283742] Kernel panic - not syncing: Fatal exception [ 41.290444] Kernel Offset: disabled [ 41.294211] Rebooting in 86400 seconds..