[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.537831] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.289912] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 29.799427] random: sshd: uninitialized urandom read (32 bytes read, 43 bits of entropy available) [ 30.493937] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 30.661342] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 36.205598] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) executing program [ 36.293787] BUG: unable to handle kernel paging request at ffffeafff8e10008 [ 36.301226] IP: [] page_remove_rmap+0x2e/0x260 [ 36.307613] PGD 0 [ 36.309934] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.314972] Dumping ftrace buffer: [ 36.318490] (ftrace buffer empty) [ 36.322182] Modules linked in: [ 36.325469] CPU: 0 PID: 3841 Comm: syz-executor545 Not tainted 4.4.149-gf76bdbd #18 [ 36.333237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.342578] task: ffff8801d921e000 task.stack: ffff8801c93a8000 [ 36.348611] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 36.357347] RSP: 0018:ffff8801c93af948 EFLAGS: 00010246 [ 36.362787] RAX: dffffc0000000000 RBX: ffffeafff8e10000 RCX: ffffea00071e8000 [ 36.370036] RDX: 1ffffd5fff1c2001 RSI: ffffffff814bc8bf RDI: ffffeafff8e10008 [ 36.377290] RBP: ffff8801c93af958 R08: ffffffff85333170 R09: 0000000000000000 [ 36.384544] R10: 0000000000000001 R11: ffff8801d921e000 R12: 0000000000000001 [ 36.391791] R13: 1ffff10039275f2f R14: ffff8801d1806810 R15: ffffeafff8e10000 [ 36.399083] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.407299] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.413270] CR2: ffffeafff8e10008 CR3: 00000001d21c7000 CR4: 00000000001606f0 [ 36.420520] Stack: [ 36.422646] ffff8801c93afbd8 0000000000000001 ffff8801c93afa00 ffffffff8150a443 [ 36.430642] 00003ffe384001a0 00003ffe384001a0 0000000041b58ab3 ffffffff841ef837 [ 36.438639] ffffffff8150a240 00000000000004f0 ffff8801d91f5528 ffff8801c93af9c8 [ 36.446638] Call Trace: [ 36.449276] [] zap_huge_pmd+0x203/0x510 [ 36.454889] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.461450] [] unmap_single_vma+0xea3/0x1240 [ 36.467482] [] ? vm_normal_page+0x230/0x230 [ 36.473434] [] ? __put_single_page+0x60/0x60 [ 36.479471] [] unmap_vmas+0x81/0xd0 [ 36.484727] [] exit_mmap+0x1c9/0x3a0 [ 36.490073] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.496559] [] ? up_write+0x1a/0x60 [ 36.501819] [] mmput+0xf8/0x2d0 [ 36.506725] [] do_exit+0x8d8/0x26b0 [ 36.511980] [] ? file_map_prot_check+0x193/0x310 [ 36.518415] [] ? release_task.part.17+0x1200/0x1200 [ 36.525064] [] ? SyS_mprotect+0x41e/0x640 [ 36.530841] [] ? up_write+0x1a/0x60 [ 36.536097] [] ? SyS_mprotect+0x423/0x640 [ 36.541871] [] do_group_exit+0x111/0x330 [ 36.547558] [] ? do_group_exit+0x330/0x330 [ 36.553417] [] SyS_exit_group+0x1d/0x20 [ 36.559082] [] do_fast_syscall_32+0x324/0x8b0 [ 36.565289] [] sysenter_flags_fixed+0xd/0x1a [ 36.571326] 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 [ 36.598512] RIP [] page_remove_rmap+0x2e/0x260 [ 36.604881] RSP [ 36.608488] CR2: ffffeafff8e10008 [ 36.611921] ---[ end trace 322609c3ab37f66d ]--- [ 36.616651] Kernel panic - not syncing: Fatal exception [ 36.622348] Dumping ftrace buffer: [ 36.625873] (ftrace buffer empty) [ 36.629603] Kernel Offset: disabled [ 36.633278] Rebooting in 86400 seconds..