[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.184363] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.800588] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.276257] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.984944] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 27.175114] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 32.694631] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 32.777517] BUG: unable to handle kernel paging request at ffffeafffd3c0008 [ 32.784866] IP: [] page_remove_rmap+0x2e/0x260 [ 32.791115] PGD 0 [ 32.793350] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.798294] Dumping ftrace buffer: [ 32.801805] (ftrace buffer empty) [ 32.805496] Modules linked in: [ 32.808787] CPU: 1 PID: 3843 Comm: syz-executor027 Not tainted 4.4.150-g5541782 #83 [ 32.816586] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.825915] task: ffff8801d906c800 task.stack: ffff8800bb158000 [ 32.831946] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.840633] RSP: 0018:ffff8800bb15f9c0 EFLAGS: 00010246 [ 32.846059] RAX: dffffc0000000000 RBX: ffffeafffd3c0000 RCX: 0000000000000000 [ 32.853309] RDX: 1ffffd5fffa78001 RSI: ffffffff814bceaf RDI: ffffeafffd3c0008 [ 32.860557] RBP: ffff8800bb15f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.867800] R10: 0000000000000001 R11: ffff8801d906c800 R12: 0000000000000001 [ 32.875080] R13: 1ffff1001762bf3e R14: ffff8800b39a1800 R15: ffffeafffd3c0000 [ 32.882325] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.890527] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.896386] CR2: ffffeafffd3c0008 CR3: 00000000b2b43000 CR4: 00000000001606f0 [ 32.903636] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.910883] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.918126] Stack: [ 32.920246] ffff8800bb15fc50 0000000000000001 ffff8800bb15fa78 ffffffff8150ad13 [ 32.928231] 00003fff4f0001e0 00003fff4f0001e0 0000000041b58ab3 ffffffff841ef837 [ 32.936216] ffffffff8150ab10 00000000000004f0 ffff8800ada77318 ffff8800bb15fa40 [ 32.944206] Call Trace: [ 32.946774] [] zap_huge_pmd+0x203/0x510 [ 32.952373] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.958927] [] unmap_single_vma+0xea3/0x1240 [ 32.964977] [] ? vm_normal_page+0x280/0x280 [ 32.970926] [] ? __put_single_page+0x60/0x60 [ 32.976972] [] unmap_vmas+0x81/0xd0 [ 32.982238] [] exit_mmap+0x1c9/0x3a0 [ 32.987577] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.994048] [] ? up_write+0x1a/0x60 [ 32.999317] [] mmput+0xf8/0x2d0 [ 33.004220] [] do_exit+0x8d8/0x26b0 [ 33.009474] [] ? file_map_prot_check+0x193/0x310 [ 33.015861] [] ? release_task.part.17+0x1200/0x1200 [ 33.022503] [] ? SyS_mprotect+0x41e/0x640 [ 33.028278] [] ? up_write+0x1a/0x60 [ 33.033529] [] ? SyS_mprotect+0x423/0x640 [ 33.039302] [] do_group_exit+0x111/0x330 [ 33.044985] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.051452] [] SyS_exit_group+0x1d/0x20 [ 33.057057] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.063607] 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 [ 33.090570] RIP [] page_remove_rmap+0x2e/0x260 [ 33.096900] RSP [ 33.100516] CR2: ffffeafffd3c0008 [ 33.103959] ---[ end trace 800366b024b4d809 ]--- [ 33.108686] Kernel panic - not syncing: Fatal exception [ 33.114367] Dumping ftrace buffer: [ 33.117893] (ftrace buffer empty) [ 33.121575] Kernel Offset: disabled [ 33.125175] Rebooting in 86400 seconds..