[ 16.481957] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.397175] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.673895] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 22.485860] random: sshd: uninitialized urandom read (32 bytes read, 99 bits of entropy available) [ 22.658468] random: sshd: uninitialized urandom read (32 bytes read, 105 bits of entropy available) Warning: Permanently added '10.128.15.238' (ECDSA) to the list of known hosts. [ 28.042935] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) executing program executing program [ 28.150233] kasan: CONFIG_KASAN_INLINE enabled [ 28.154656] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.168074] Dumping ftrace buffer: [ 28.171583] (ftrace buffer empty) [ 28.175260] Modules linked in: [ 28.178529] CPU: 1 PID: 3323 Comm: syzkaller188611 Not tainted 4.4.107-g610c835 #12 [ 28.186291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.195632] task: ffff8801d23317c0 task.stack: ffff8800b45f0000 [ 28.201650] RIP: 0010:[] [] sg_read+0xd1d/0x1490 [ 28.209715] RSP: 0018:ffff8800b45f7b00 EFLAGS: 00010246 [ 28.215131] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff825bb194 [ 28.222367] RDX: 0000000000000000 RSI: 0000000020692f5a RDI: ffff8801d10da270 [ 28.229607] RBP: ffff8800b45f7c08 R08: 0000000000000000 R09: 0000000000000001 [ 28.236844] R10: 0000000000000000 R11: 1ffff100168bef26 R12: 00000000000000a6 [ 28.244086] R13: 0000000000000000 R14: ffff8801d101da20 R15: ffff8801d10da240 [ 28.251323] FS: 00007f50e82c6700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.259515] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.265362] CR2: 0000000020692f36 CR3: 00000001d085c000 CR4: 00000000001406e0 [ 28.272604] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.279845] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.287081] Stack: [ 28.289194] 0000000000000000 000077ff80000000 ffff8800b45f7b60 ffff8801d10da258 [ 28.297137] 0000000000000008 ffff8801d10da268 00000000000000ca 0000000000000002 [ 28.305079] ffff8800b7f4d400 0000000000001000 1ffff100168bef6c 0000000020692f5a [ 28.313028] Call Trace: [ 28.315581] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.322213] [] ? fsnotify+0xee0/0xee0 [ 28.327631] [] ? iov_iter_advance+0x164/0x4f0 [ 28.333743] [] do_loop_readv_writev+0x141/0x1e0 [ 28.340030] [] ? security_file_permission+0x89/0x1e0 [ 28.346748] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.353379] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.360131] [] do_readv_writev+0x5dd/0x6e0 [ 28.366243] [] ? vfs_write+0x530/0x530 [ 28.372354] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.378289] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.385268] [] ? __fget+0x20b/0x3b0 [ 28.390517] [] ? __fget+0x232/0x3b0 [ 28.395766] [] ? __fget+0x47/0x3b0 [ 28.401184] [] vfs_readv+0x78/0xb0 [ 28.406353] [] SyS_readv+0xd9/0x240 [ 28.411616] [] ? rw_copy_check_uvector+0x2d0/0x2d0 [ 28.418189] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 28.424761] [] entry_SYSCALL_64_fastpath+0x16/0x76 executing program [ 28.431327] Code: 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 97 06 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 5f 28 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 6b 06 00 00 48 8b 1b 48 85 db 0f 84 3b 03 00 [ 28.459672] RIP [] sg_read+0xd1d/0x1490 [ 28.465379] RSP [ 28.469537] ---[ end trace f3f64dac24e86660 ]--- [ 28.474283] Kernel panic - not syncing: Fatal exception [ 28.480446] Dumping ftrace buffer: [ 28.483953] (ftrace buffer empty) [ 28.487627] Kernel Offset: disabled [ 28.491218] Rebooting in 86400 seconds..