[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.649527] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.237007] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [ 20.561351] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.187492] random: sshd: uninitialized urandom read (32 bytes read, 52 bits of entropy available) [ 21.369997] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 27.010815] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) executing program [ 27.108385] BUG: unable to handle kernel paging request at ffffeafffd3d0008 [ 27.115747] IP: [] page_remove_rmap+0x2e/0x260 [ 27.122000] PGD 0 [ 27.124243] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.129214] Dumping ftrace buffer: [ 27.132726] (ftrace buffer empty) [ 27.136440] Modules linked in: [ 27.139750] CPU: 1 PID: 3710 Comm: syz-executor638 Not tainted 4.4.150-g5541782 #83 [ 27.147535] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.156867] task: ffff8801ce13b000 task.stack: ffff8800b2708000 [ 27.162897] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.171575] RSP: 0018:ffff8800b270f9c0 EFLAGS: 00010246 [ 27.176999] RAX: dffffc0000000000 RBX: ffffeafffd3d0000 RCX: 0000000000000000 [ 27.184273] RDX: 1ffffd5fffa7a001 RSI: ffffffff814bceaf RDI: ffffeafffd3d0008 [ 27.191521] RBP: ffff8800b270f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.199042] R10: 0000000000000001 R11: ffff8801ce13b000 R12: 0000000000000001 [ 27.206286] R13: 1ffff100164e1f3e R14: ffff8800b4965800 R15: ffffeafffd3d0000 [ 27.213533] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.221732] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.227587] CR2: ffffeafffd3d0008 CR3: 00000000b2707000 CR4: 00000000001606f0 [ 27.234830] Stack: [ 27.236961] ffff8800b270fc50 0000000000000001 ffff8800b270fa78 ffffffff8150ad13 [ 27.244974] 00003fff4f4001e0 00003fff4f4001e0 0000000041b58ab3 ffffffff841ef837 [ 27.253003] ffffffff8150ab10 00000000000004f0 ffff8800b6b519a0 ffff8800b270fa40 [ 27.261012] Call Trace: [ 27.263579] [] zap_huge_pmd+0x203/0x510 [ 27.269180] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.275739] [] unmap_single_vma+0xea3/0x1240 [ 27.281786] [] ? vm_normal_page+0x280/0x280 [ 27.287735] [] ? __put_single_page+0x60/0x60 [ 27.293769] [] unmap_vmas+0x81/0xd0 [ 27.299021] [] exit_mmap+0x1c9/0x3a0 [ 27.304360] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.310829] [] ? up_write+0x1a/0x60 [ 27.316083] [] mmput+0xf8/0x2d0 [ 27.320988] [] do_exit+0x8d8/0x26b0 [ 27.326243] [] ? file_map_prot_check+0x193/0x310 [ 27.332641] [] ? release_task.part.17+0x1200/0x1200 [ 27.339287] [] ? SyS_mprotect+0x41e/0x640 [ 27.345077] [] ? up_write+0x1a/0x60 [ 27.350357] [] ? SyS_mprotect+0x423/0x640 [ 27.356159] [] do_group_exit+0x111/0x330 [ 27.361859] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 27.368327] [] SyS_exit_group+0x1d/0x20 [ 27.373941] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 27.380492] 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 [ 27.407535] RIP [] page_remove_rmap+0x2e/0x260 [ 27.413867] RSP [ 27.417476] CR2: ffffeafffd3d0008 [ 27.420904] ---[ end trace 4d0d65dd23934c7e ]--- [ 27.425650] Kernel panic - not syncing: Fatal exception [ 27.431335] Dumping ftrace buffer: [ 27.434860] (ftrace buffer empty) [ 27.438543] Kernel Offset: disabled [ 27.442145] Rebooting in 86400 seconds..