[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.191214] 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: [ 27.074374] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.533512] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 28.281047] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 28.445097] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 34.130457] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 34.217012] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 34.224363] IP: [] page_remove_rmap+0x2e/0x260 [ 34.230607] PGD 0 [ 34.232844] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.237783] Dumping ftrace buffer: [ 34.241297] (ftrace buffer empty) [ 34.244981] Modules linked in: [ 34.248264] CPU: 0 PID: 3740 Comm: syz-executor714 Not tainted 4.4.150-g5541782 #19 [ 34.256029] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.265375] task: ffff8800b11e9800 task.stack: ffff8800b0de0000 [ 34.271415] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.280108] RSP: 0018:ffff8800b0de7948 EFLAGS: 00010246 [ 34.285545] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 34.292790] RDX: 1ffffd5fffa81001 RSI: ffffffff814bceaf RDI: ffffeafffd408008 [ 34.300032] RBP: ffff8800b0de7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.307275] R10: 0000000000000001 R11: ffff8800b11e9800 R12: 0000000000000001 [ 34.314535] R13: 1ffff100161bcf2f R14: ffff8800b6aa8800 R15: ffffeafffd408000 [ 34.321779] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.329991] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.335860] CR2: ffffeafffd408008 CR3: 00000000b5aad000 CR4: 00000000001606f0 [ 34.343126] Stack: [ 34.345258] ffff8800b0de7bd8 0000000000000001 ffff8800b0de7a00 ffffffff8150ad13 [ 34.353243] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef837 [ 34.361224] ffffffff8150ab10 00000000000004f0 ffff8800b5b949f8 ffff8800b0de79c8 [ 34.369214] Call Trace: [ 34.371780] [] zap_huge_pmd+0x203/0x510 [ 34.377378] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.383946] [] unmap_single_vma+0xea3/0x1240 [ 34.389993] [] ? vm_normal_page+0x280/0x280 [ 34.395955] [] ? __put_single_page+0x60/0x60 [ 34.401990] [] unmap_vmas+0x81/0xd0 [ 34.407243] [] exit_mmap+0x1c9/0x3a0 [ 34.412579] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.419046] [] ? up_write+0x1a/0x60 [ 34.424299] [] mmput+0xf8/0x2d0 [ 34.429203] [] do_exit+0x8d8/0x26b0 [ 34.434469] [] ? handle_mm_fault+0x19b9/0x3180 [ 34.440675] [] ? release_task.part.17+0x1200/0x1200 [ 34.447314] [] do_group_exit+0x111/0x330 [ 34.453013] [] ? do_group_exit+0x330/0x330 [ 34.458874] [] SyS_exit_group+0x1d/0x20 [ 34.464476] [] do_fast_syscall_32+0x324/0x8b0 [ 34.470598] [] sysenter_flags_fixed+0xd/0x1a [ 34.476624] 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 [ 34.503464] RIP [] page_remove_rmap+0x2e/0x260 [ 34.509795] RSP [ 34.513401] CR2: ffffeafffd408008 [ 34.516837] ---[ end trace 902e2ec558b8e626 ]--- [ 34.521578] Kernel panic - not syncing: Fatal exception [ 34.527350] Dumping ftrace buffer: [ 34.530874] (ftrace buffer empty) [ 34.534556] Kernel Offset: disabled [ 34.538158] Rebooting in 86400 seconds..