[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.335649] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.329480] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.007893] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 29.732417] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 29.896184] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 35.474068] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 35.562554] BUG: unable to handle kernel paging request at ffffeafffd438008 [ 35.570074] IP: [] page_remove_rmap+0x2e/0x260 [ 35.576347] PGD 0 [ 35.578594] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.583597] Dumping ftrace buffer: [ 35.587110] (ftrace buffer empty) [ 35.590797] Modules linked in: [ 35.594077] CPU: 0 PID: 3860 Comm: syz-executor925 Not tainted 4.4.150-g5541782 #19 [ 35.601851] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.611197] task: ffff8801d94bc800 task.stack: ffff8800b5520000 [ 35.617228] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.625908] RSP: 0018:ffff8800b5527948 EFLAGS: 00010246 [ 35.631330] RAX: dffffc0000000000 RBX: ffffeafffd438000 RCX: 0000000000000000 [ 35.638572] RDX: 1ffffd5fffa87001 RSI: ffffffff814bceaf RDI: ffffeafffd438008 [ 35.645815] RBP: ffff8800b5527958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.653056] R10: 0000000000000001 R11: ffff8801d94bc800 R12: 0000000000000001 [ 35.660297] R13: 1ffff10016aa4f2f R14: ffff8800af575800 R15: ffffeafffd438000 [ 35.667540] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.675738] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 35.681588] CR2: ffffeafffd438008 CR3: 00000000af7e1000 CR4: 00000000001606f0 [ 35.688831] Stack: [ 35.690949] ffff8800b5527bd8 0000000000000001 ffff8800b5527a00 ffffffff8150ad13 [ 35.698924] 00003fff50e001e0 00003fff50e001e0 0000000041b58ab3 ffffffff841ef837 [ 35.706906] ffffffff8150ab10 00000000000004f0 ffff8800b2a29cb8 ffff8800b55279c8 [ 35.714888] Call Trace: [ 35.717463] [] zap_huge_pmd+0x203/0x510 [ 35.723059] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.729608] [] unmap_single_vma+0xea3/0x1240 [ 35.735645] [] ? vm_normal_page+0x280/0x280 [ 35.741600] [] ? __put_single_page+0x60/0x60 [ 35.747647] [] unmap_vmas+0x81/0xd0 [ 35.752902] [] exit_mmap+0x1c9/0x3a0 [ 35.758236] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.764721] [] ? up_write+0x1a/0x60 [ 35.769984] [] mmput+0xf8/0x2d0 [ 35.774886] [] do_exit+0x8d8/0x26b0 [ 35.780140] [] ? file_map_prot_check+0x193/0x310 [ 35.786517] [] ? release_task.part.17+0x1200/0x1200 [ 35.793156] [] ? SyS_mprotect+0x41e/0x640 [ 35.798939] [] ? up_write+0x1a/0x60 [ 35.804203] [] ? SyS_mprotect+0x423/0x640 [ 35.809983] [] do_group_exit+0x111/0x330 [ 35.815664] [] ? do_group_exit+0x330/0x330 [ 35.821520] [] SyS_exit_group+0x1d/0x20 [ 35.827119] [] do_fast_syscall_32+0x324/0x8b0 [ 35.833249] [] sysenter_flags_fixed+0xd/0x1a [ 35.839290] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 35.866373] RIP [] page_remove_rmap+0x2e/0x260 [ 35.872704] RSP [ 35.876312] CR2: ffffeafffd438008 [ 35.879743] ---[ end trace 873a8a13546d7f13 ]--- [ 35.884492] Kernel panic - not syncing: Fatal exception [ 35.890135] Dumping ftrace buffer: [ 35.893655] (ftrace buffer empty) [ 35.897348] Kernel Offset: disabled [ 35.900950] Rebooting in 86400 seconds..