[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.045584] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.111132] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.460563] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.331573] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) [ 41.595587] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) Warning: Permanently added '10.128.15.202' (ECDSA) to the list of known hosts. [ 47.002488] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) executing program [ 47.112232] kasan: CONFIG_KASAN_INLINE enabled [ 47.116701] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.130323] Dumping ftrace buffer: [ 47.133826] (ftrace buffer empty) [ 47.137503] Modules linked in: [ 47.140788] CPU: 1 PID: 3327 Comm: syzkaller852359 Not tainted 4.4.107-g610c835 #4 [ 47.148462] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.157795] task: ffff8801d10aaf80 task.stack: ffff8800b38f0000 [ 47.163816] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 47.172043] RSP: 0018:ffff8800b38f7a40 EFLAGS: 00010a07 [ 47.177457] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 47.184693] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 47.191950] RBP: ffff8800b38f7a50 R08: 0000000000000001 R09: 0000000000000000 [ 47.199188] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 47.206425] R13: 0000000000000020 R14: ffff8800b3890000 R15: dffffc0000000000 [ 47.213664] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000088a8840 [ 47.221856] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 47.227794] CR2: 0000000020001000 CR3: 00000000b4241000 CR4: 00000000001406e0 [ 47.235035] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.242272] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.249510] Stack: [ 47.251623] 0000000000000000 ffff8800b3890158 ffff8800b38f7ab0 ffffffff825b8cf1 [ 47.259581] ffff8800b3890170 ffffed001671202b ffffed001671202e ffff8800b3890168 [ 47.267530] dead4ead00000000 ffff8800b3890140 0000000000000000 0000000000000000 [ 47.275485] Call Trace: [ 47.278041] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 47.284511] [] sg_finish_rem_req+0x2b5/0x340 [ 47.290535] [] sg_new_read.isra.18+0x39/0x3c0 [ 47.296645] [] ? sg_get_rq_mark+0x142/0x190 [ 47.302582] [] sg_read+0x8c2/0x1490 [ 47.307826] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 47.314982] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 47.321613] [] ? __lock_is_held+0xa1/0xf0 [ 47.327379] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 47.334013] [] __vfs_read+0x103/0x440 [ 47.339432] [] ? vfs_iter_write+0x2d0/0x2d0 [ 47.345380] [] ? fsnotify+0x5ad/0xee0 [ 47.350795] [] ? fsnotify+0xee0/0xee0 [ 47.356210] [] ? _raw_spin_unlock+0x2c/0x50 [ 47.362147] [] ? avc_policy_seqno+0x9/0x20 [ 47.367997] [] ? selinux_file_permission+0x348/0x460 [ 47.374727] [] ? security_file_permission+0x89/0x1e0 [ 47.381447] [] ? rw_verify_area+0x100/0x2f0 [ 47.387388] [] vfs_read+0x123/0x3a0 [ 47.393171] [] SyS_read+0xd9/0x1b0 [ 47.398331] [] ? do_sendfile+0xd30/0xd30 [ 47.404008] [] ? do_fast_syscall_32+0xd7/0x890 [ 47.410207] [] ? do_sendfile+0xd30/0xd30 [ 47.415885] [] do_fast_syscall_32+0x314/0x890 [ 47.422000] [] sysenter_flags_fixed+0xd/0x17 [ 47.428026] Code: 76 ae 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 47.454360] RIP [] __free_pages+0x21/0x90 [ 47.460239] RSP [ 47.464222] ---[ end trace f6cc107ac514ce52 ]--- [ 47.468954] Kernel panic - not syncing: Fatal exception [ 47.474613] Dumping ftrace buffer: [ 47.478123] (ftrace buffer empty) [ 47.481802] Kernel Offset: disabled [ 47.485395] Rebooting in 86400 seconds..