[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.926615] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.247843] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.547321] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.207239] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 26.393398] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.10.16' (ECDSA) to the list of known hosts. [ 32.301100] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) executing program [ 32.391760] BUG: unable to handle kernel paging request at ffffeafffd378008 [ 32.399094] IP: [] page_remove_rmap+0x2e/0x260 [ 32.405340] PGD 0 [ 32.407580] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.412529] Dumping ftrace buffer: [ 32.416043] (ftrace buffer empty) [ 32.419725] Modules linked in: [ 32.423052] CPU: 1 PID: 3850 Comm: syz-executor856 Not tainted 4.4.150-g5541782 #83 [ 32.430825] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.440154] task: ffff8801c8723000 task.stack: ffff8800bbaa0000 [ 32.446184] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.454864] RSP: 0018:ffff8800bbaa79c0 EFLAGS: 00010246 [ 32.460282] RAX: dffffc0000000000 RBX: ffffeafffd378000 RCX: 0000000000000000 [ 32.467528] RDX: 1ffffd5fffa6f001 RSI: ffffffff814bceaf RDI: ffffeafffd378008 [ 32.474799] RBP: ffff8800bbaa79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.482039] R10: 0000000000000001 R11: ffff8801c8723000 R12: 0000000000000001 [ 32.489279] R13: 1ffff10017754f3e R14: ffff8800b5576800 R15: ffffeafffd378000 [ 32.496528] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.504728] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.510582] CR2: ffffeafffd378008 CR3: 00000000b589d000 CR4: 00000000001606f0 [ 32.517833] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.525078] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.532320] Stack: [ 32.534441] ffff8800bbaa7c50 0000000000000001 ffff8800bbaa7a78 ffffffff8150ad13 [ 32.542420] 00003fff4de001e0 00003fff4de001e0 0000000041b58ab3 ffffffff841ef837 [ 32.550401] ffffffff8150ab10 00000000000004f0 ffff8801c85c9948 ffff8800bbaa7a40 [ 32.558370] Call Trace: [ 32.560937] [] zap_huge_pmd+0x203/0x510 [ 32.566540] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.573088] [] unmap_single_vma+0xea3/0x1240 [ 32.579117] [] ? vm_normal_page+0x280/0x280 [ 32.585059] [] ? __put_single_page+0x60/0x60 [ 32.591087] [] unmap_vmas+0x81/0xd0 [ 32.596334] [] exit_mmap+0x1c9/0x3a0 [ 32.601806] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.608374] [] ? up_write+0x1a/0x60 [ 32.613637] [] mmput+0xf8/0x2d0 [ 32.618659] [] do_exit+0x8d8/0x26b0 [ 32.623912] [] ? file_map_prot_check+0x193/0x310 [ 32.630288] [] ? release_task.part.17+0x1200/0x1200 [ 32.636931] [] ? SyS_mprotect+0x41e/0x640 [ 32.642705] [] ? up_write+0x1a/0x60 [ 32.647952] [] ? SyS_mprotect+0x423/0x640 [ 32.653723] [] do_group_exit+0x111/0x330 [ 32.659404] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.665867] [] SyS_exit_group+0x1d/0x20 [ 32.671464] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.678008] 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 [ 32.704798] RIP [] page_remove_rmap+0x2e/0x260 [ 32.711262] RSP [ 32.714865] CR2: ffffeafffd378008 [ 32.718290] ---[ end trace 023ab8f811cc4530 ]--- [ 32.723018] Kernel panic - not syncing: Fatal exception [ 32.728707] Dumping ftrace buffer: [ 32.732220] (ftrace buffer empty) [ 32.736003] Kernel Offset: disabled [ 32.739605] Rebooting in 86400 seconds..