[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.076888] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.910982] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.119781] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.703259] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 40.662803] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 46.160748] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 46.251269] BUG: unable to handle kernel paging request at ffffeafffd400008 [ 46.258679] IP: [] page_remove_rmap+0x2e/0x260 [ 46.264962] PGD 0 [ 46.267225] Oops: 0000 [#1] PREEMPT SMP KASAN [ 46.272212] Dumping ftrace buffer: [ 46.275824] (ftrace buffer empty) [ 46.279595] Modules linked in: [ 46.282914] CPU: 0 PID: 3849 Comm: syz-executor612 Not tainted 4.4.150-g5541782 #83 [ 46.290696] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.300124] task: ffff8800bb0e0000 task.stack: ffff8800bb250000 [ 46.306338] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 46.315052] RSP: 0018:ffff8800bb2579c0 EFLAGS: 00010246 [ 46.320521] RAX: dffffc0000000000 RBX: ffffeafffd400000 RCX: 0000000000000000 [ 46.327791] RDX: 1ffffd5fffa80001 RSI: ffffffff814bceaf RDI: ffffeafffd400008 [ 46.335143] RBP: ffff8800bb2579d0 R08: ffffffff85314df0 R09: 0000000000000000 [ 46.342506] R10: 0000000000000001 R11: ffff8800bb0e0000 R12: 0000000000000001 [ 46.349768] R13: 1ffff1001764af3e R14: ffff8800b3898800 R15: ffffeafffd400000 [ 46.357177] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 46.365431] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.371387] CR2: ffffeafffd400008 CR3: 00000000b3849000 CR4: 00000000001606f0 [ 46.378696] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.386018] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.393365] Stack: [ 46.395643] ffff8800bb257c50 0000000000000001 ffff8800bb257a78 ffffffff8150ad13 [ 46.403815] 00003fff500001e0 00003fff500001e0 0000000041b58ab3 ffffffff841ef837 [ 46.412061] ffffffff8150ab10 00000000000004f0 ffff8801c830ec60 ffff8800bb257a40 [ 46.420199] Call Trace: [ 46.422784] [] zap_huge_pmd+0x203/0x510 [ 46.428402] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 46.435405] [] unmap_single_vma+0xea3/0x1240 [ 46.441445] [] ? vm_normal_page+0x280/0x280 [ 46.447507] [] ? __put_single_page+0x60/0x60 [ 46.453645] [] unmap_vmas+0x81/0xd0 [ 46.458910] [] exit_mmap+0x1c9/0x3a0 [ 46.464264] [] ? SyS_remap_file_pages+0x870/0x870 [ 46.470863] [] ? up_write+0x1a/0x60 [ 46.476123] [] mmput+0xf8/0x2d0 [ 46.481040] [] do_exit+0x8d8/0x26b0 [ 46.486365] [] ? file_map_prot_check+0x193/0x310 [ 46.492889] [] ? release_task.part.17+0x1200/0x1200 [ 46.499586] [] ? SyS_mprotect+0x41e/0x640 [ 46.505419] [] ? up_write+0x1a/0x60 [ 46.510814] [] ? SyS_mprotect+0x423/0x640 [ 46.516654] [] do_group_exit+0x111/0x330 [ 46.522405] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 46.528895] [] SyS_exit_group+0x1d/0x20 [ 46.534514] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 46.541075] 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 [ 46.569023] RIP [] page_remove_rmap+0x2e/0x260 [ 46.575388] RSP [ 46.578994] CR2: ffffeafffd400008 [ 46.582494] ---[ end trace 27f96b7c6f1fad5f ]--- [ 46.587251] Kernel panic - not syncing: Fatal exception [ 46.592655] Dumping ftrace buffer: [ 46.596262] (ftrace buffer empty) [ 46.600031] Kernel Offset: disabled [ 46.603757] Rebooting in 86400 seconds..