[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.519264] 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: [ 29.858657] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 30.313082] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.006036] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 31.170902] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. [ 36.952558] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) executing program [ 37.042105] BUG: unable to handle kernel paging request at ffffeafffd348008 [ 37.049470] IP: [] page_remove_rmap+0x2e/0x260 [ 37.055716] PGD 0 [ 37.057964] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.062962] Dumping ftrace buffer: [ 37.066477] (ftrace buffer empty) [ 37.070170] Modules linked in: [ 37.073460] CPU: 1 PID: 3781 Comm: syz-executor451 Not tainted 4.4.149-gf76bdbd #18 [ 37.081229] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.090562] task: ffff8800afb0e000 task.stack: ffff8800af5c8000 [ 37.096591] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 37.105328] RSP: 0018:ffff8800af5cf948 EFLAGS: 00010246 [ 37.110753] RAX: dffffc0000000000 RBX: ffffeafffd348000 RCX: 0000000000000000 [ 37.118055] RDX: 1ffffd5fffa69001 RSI: ffffffff814bc8bf RDI: ffffeafffd348008 [ 37.125310] RBP: ffff8800af5cf958 R08: ffffffff85333170 R09: 0000000000000000 [ 37.132562] R10: 0000000000000001 R11: ffff8800afb0e000 R12: 0000000000000001 [ 37.139812] R13: 1ffff10015eb9f2f R14: ffff8800b16cc800 R15: ffffeafffd348000 [ 37.147120] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.155329] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 37.161192] CR2: ffffeafffd348008 CR3: 00000000b387a000 CR4: 00000000001606f0 [ 37.168441] Stack: [ 37.170569] ffff8800af5cfbd8 0000000000000001 ffff8800af5cfa00 ffffffff8150a443 [ 37.178559] 00003fff4d2001e0 00003fff4d2001e0 0000000041b58ab3 ffffffff841ef837 [ 37.186548] ffffffff8150a240 00000000000004f0 ffff8800af9a0bb0 ffff8800af5cf9c8 [ 37.194549] Call Trace: [ 37.197129] [] zap_huge_pmd+0x203/0x510 [ 37.202737] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 37.209297] [] unmap_single_vma+0xea3/0x1240 [ 37.215380] [] ? vm_normal_page+0x230/0x230 [ 37.221338] [] ? __put_single_page+0x60/0x60 [ 37.227374] [] unmap_vmas+0x81/0xd0 [ 37.232630] [] exit_mmap+0x1c9/0x3a0 [ 37.238023] [] ? SyS_remap_file_pages+0x870/0x870 [ 37.244504] [] ? up_write+0x1a/0x60 [ 37.249763] [] mmput+0xf8/0x2d0 [ 37.254667] [] do_exit+0x8d8/0x26b0 [ 37.259995] [] ? file_map_prot_check+0x193/0x310 [ 37.266383] [] ? release_task.part.17+0x1200/0x1200 [ 37.273030] [] ? SyS_mprotect+0x41e/0x640 [ 37.278810] [] ? up_write+0x1a/0x60 [ 37.284068] [] ? SyS_mprotect+0x423/0x640 [ 37.289843] [] do_group_exit+0x111/0x330 [ 37.295527] [] ? do_group_exit+0x330/0x330 [ 37.301443] [] SyS_exit_group+0x1d/0x20 [ 37.307055] [] do_fast_syscall_32+0x324/0x8b0 [ 37.313181] [] sysenter_flags_fixed+0xd/0x1a [ 37.319212] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 37.346449] RIP [] page_remove_rmap+0x2e/0x260 [ 37.352792] RSP [ 37.356396] CR2: ffffeafffd348008 [ 37.359826] ---[ end trace 85de67947bd68836 ]--- [ 37.364601] Kernel panic - not syncing: Fatal exception [ 37.370275] Dumping ftrace buffer: [ 37.373799] (ftrace buffer empty) [ 37.377488] Kernel Offset: disabled [ 37.381093] Rebooting in 86400 seconds..