[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.634974] 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: [ 23.409759] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.732132] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.472774] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 24.658653] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 30.349610] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 30.440426] BUG: unable to handle kernel paging request at ffffeafffd328008 [ 30.447772] IP: [] page_remove_rmap+0x2e/0x260 [ 30.454022] PGD 0 [ 30.456275] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.461220] Dumping ftrace buffer: [ 30.464730] (ftrace buffer empty) [ 30.468426] Modules linked in: [ 30.471715] CPU: 1 PID: 3820 Comm: syz-executor484 Not tainted 4.4.148-gf057ff9 #81 [ 30.479483] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.488820] task: ffff8801d374c800 task.stack: ffff8800adfc8000 [ 30.494852] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.503528] RSP: 0018:ffff8800adfcf9c0 EFLAGS: 00010246 [ 30.508952] RAX: dffffc0000000000 RBX: ffffeafffd328000 RCX: 0000000000000000 [ 30.516196] RDX: 1ffffd5fffa65001 RSI: ffffffff814bc75f RDI: ffffeafffd328008 [ 30.523441] RBP: ffff8800adfcf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.530696] R10: 0000000000000001 R11: ffff8801d374c800 R12: 0000000000000001 [ 30.537940] R13: 1ffff10015bf9f3e R14: ffff8800b1fbb800 R15: ffffeafffd328000 [ 30.545184] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.553383] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.559240] CR2: ffffeafffd328008 CR3: 00000000b4455000 CR4: 00000000001606f0 [ 30.566509] Stack: [ 30.568636] ffff8800adfcfc50 0000000000000001 ffff8800adfcfa78 ffffffff8150a1f3 [ 30.576620] 00003fff4ca001e0 00003fff4ca001e0 0000000041b58ab3 ffffffff841ef82f [ 30.584603] ffffffff81509ff0 00000000000004f0 ffff8800b0eb98f0 ffff8800adfcfa40 [ 30.592592] Call Trace: [ 30.595153] [] zap_huge_pmd+0x203/0x510 [ 30.600769] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.607323] [] unmap_single_vma+0xea3/0x1240 [ 30.613354] [] ? vm_normal_page+0x230/0x230 [ 30.619299] [] ? __put_single_page+0x60/0x60 [ 30.625344] [] unmap_vmas+0x81/0xd0 [ 30.630614] [] exit_mmap+0x1c9/0x3a0 [ 30.635974] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.642445] [] ? up_write+0x1a/0x60 [ 30.647698] [] mmput+0xf8/0x2d0 [ 30.652621] [] do_exit+0x8d8/0x26b0 [ 30.657891] [] ? file_map_prot_check+0x193/0x310 [ 30.664271] [] ? release_task.part.17+0x1200/0x1200 [ 30.670914] [] ? SyS_mprotect+0x41e/0x640 [ 30.676686] [] ? up_write+0x1a/0x60 [ 30.681938] [] ? SyS_mprotect+0x423/0x640 [ 30.687712] [] do_group_exit+0x111/0x330 [ 30.693395] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.699863] [] SyS_exit_group+0x1d/0x20 [ 30.705464] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.712013] 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 [ 30.738882] RIP [] page_remove_rmap+0x2e/0x260 [ 30.745210] RSP [ 30.748806] CR2: ffffeafffd328008 [ 30.752234] ---[ end trace bab24b5e4cf60ee7 ]--- [ 30.756959] Kernel panic - not syncing: Fatal exception [ 30.762608] Dumping ftrace buffer: [ 30.766133] (ftrace buffer empty) [ 30.769818] Kernel Offset: disabled [ 30.773421] Rebooting in 86400 seconds..