[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.965892] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.400441] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.824624] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.576596] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 27.748779] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 33.302052] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 33.395674] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 33.403130] IP: [] page_remove_rmap+0x2e/0x260 [ 33.409406] PGD 0 [ 33.411676] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.416760] Dumping ftrace buffer: [ 33.420403] (ftrace buffer empty) [ 33.424112] Modules linked in: [ 33.427419] CPU: 0 PID: 3840 Comm: syz-executor475 Not tainted 4.4.148-gf057ff9 #81 [ 33.435192] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.444533] task: ffff8801d935c800 task.stack: ffff8800ad148000 [ 33.450719] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.459417] RSP: 0018:ffff8800ad14f9c0 EFLAGS: 00010246 [ 33.464850] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 33.472228] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc75f RDI: ffffeafffd408008 [ 33.479588] RBP: ffff8800ad14f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.486842] R10: 0000000000000001 R11: ffff8801d935c800 R12: 0000000000000001 [ 33.494163] R13: 1ffff10015a29f3e R14: ffff8800b19b5800 R15: ffffeafffd408000 [ 33.501484] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.509704] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.515659] CR2: ffffeafffd408008 CR3: 00000000bb120000 CR4: 00000000001606f0 [ 33.522916] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.530241] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.537628] Stack: [ 33.539912] ffff8800ad14fc50 0000000000000001 ffff8800ad14fa78 ffffffff8150a1f3 [ 33.548145] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef82f [ 33.556187] ffffffff81509ff0 00000000000004f0 ffff8800bb846630 ffff8800ad14fa40 [ 33.564339] Call Trace: [ 33.566967] [] zap_huge_pmd+0x203/0x510 [ 33.572593] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.579158] [] unmap_single_vma+0xea3/0x1240 [ 33.585448] [] ? vm_normal_page+0x230/0x230 [ 33.591455] [] ? __put_single_page+0x60/0x60 [ 33.597499] [] unmap_vmas+0x81/0xd0 [ 33.602764] [] exit_mmap+0x1c9/0x3a0 [ 33.608114] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.614646] [] ? up_write+0x1a/0x60 [ 33.619959] [] mmput+0xf8/0x2d0 [ 33.624874] [] do_exit+0x8d8/0x26b0 [ 33.630139] [] ? file_map_prot_check+0x193/0x310 [ 33.636530] [] ? release_task.part.17+0x1200/0x1200 [ 33.643206] [] ? SyS_mprotect+0x41e/0x640 [ 33.649000] [] ? up_write+0x1a/0x60 [ 33.654398] [] ? SyS_mprotect+0x423/0x640 [ 33.660182] [] do_group_exit+0x111/0x330 [ 33.665931] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.672495] [] SyS_exit_group+0x1d/0x20 [ 33.678107] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.684731] 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 [ 33.712766] RIP [] page_remove_rmap+0x2e/0x260 [ 33.719198] RSP [ 33.722806] CR2: ffffeafffd408008 [ 33.726250] ---[ end trace 1757f49bd20ce770 ]--- [ 33.730988] Kernel panic - not syncing: Fatal exception [ 33.736949] Dumping ftrace buffer: [ 33.740486] (ftrace buffer empty) [ 33.744181] Kernel Offset: disabled [ 33.747792] Rebooting in 86400 seconds..