[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.999241] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.647493] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.133133] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.837276] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 27.002143] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 32.768981] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 32.859633] BUG: unable to handle kernel paging request at ffffeafff8c50008 [ 32.867168] IP: [] page_remove_rmap+0x2e/0x260 [ 32.873412] PGD 0 [ 32.875653] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.880596] Dumping ftrace buffer: [ 32.884107] (ftrace buffer empty) [ 32.887797] Modules linked in: [ 32.891087] CPU: 0 PID: 3847 Comm: syz-executor438 Not tainted 4.4.150-g5541782 #19 [ 32.898850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.908234] task: ffff8801c7950000 task.stack: ffff8801c84f8000 [ 32.914268] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.922944] RSP: 0018:ffff8801c84ff948 EFLAGS: 00010246 [ 32.928363] RAX: dffffc0000000000 RBX: ffffeafff8c50000 RCX: 0000000000000000 [ 32.935607] RDX: 1ffffd5fff18a001 RSI: ffffffff814bceaf RDI: ffffeafff8c50008 [ 32.942852] RBP: ffff8801c84ff958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.950097] R10: 0000000000000001 R11: ffff8801c7950000 R12: 0000000000000001 [ 32.957404] R13: 1ffff1003909ff2f R14: ffff8801da3dc800 R15: ffffeafff8c50000 [ 32.964657] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.972862] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.978717] CR2: ffffeafff8c50008 CR3: 00000001ca6f0000 CR4: 00000000001606f0 [ 32.985963] Stack: [ 32.988085] ffff8801c84ffbd8 0000000000000001 ffff8801c84ffa00 ffffffff8150ad13 [ 32.996067] 00003ffe314001e0 00003ffe314001e0 0000000041b58ab3 ffffffff841ef837 [ 33.004044] ffffffff8150ab10 00000000000004f0 ffff8801d0fa3688 ffff8801c84ff9c8 [ 33.012027] Call Trace: [ 33.014590] [] zap_huge_pmd+0x203/0x510 [ 33.020187] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.026737] [] unmap_single_vma+0xea3/0x1240 [ 33.032767] [] ? vm_normal_page+0x280/0x280 [ 33.038716] [] ? __put_single_page+0x60/0x60 [ 33.044855] [] unmap_vmas+0x81/0xd0 [ 33.050115] [] exit_mmap+0x1c9/0x3a0 [ 33.055459] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.061928] [] ? up_write+0x1a/0x60 [ 33.067178] [] mmput+0xf8/0x2d0 [ 33.072080] [] do_exit+0x8d8/0x26b0 [ 33.077333] [] ? file_map_prot_check+0x193/0x310 [ 33.083714] [] ? release_task.part.17+0x1200/0x1200 [ 33.090453] [] ? SyS_mprotect+0x41e/0x640 [ 33.096280] [] ? up_write+0x1a/0x60 [ 33.101539] [] ? SyS_mprotect+0x423/0x640 [ 33.107315] [] do_group_exit+0x111/0x330 [ 33.113001] [] ? do_group_exit+0x330/0x330 [ 33.118859] [] SyS_exit_group+0x1d/0x20 [ 33.124456] [] do_fast_syscall_32+0x324/0x8b0 [ 33.130626] [] sysenter_flags_fixed+0xd/0x1a [ 33.136664] 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 [ 33.163587] RIP [] page_remove_rmap+0x2e/0x260 [ 33.169951] RSP [ 33.173550] CR2: ffffeafff8c50008 [ 33.177846] ---[ end trace b8e3c16a4454966d ]--- [ 33.182577] Kernel panic - not syncing: Fatal exception [ 33.188200] Dumping ftrace buffer: [ 33.191723] (ftrace buffer empty) [ 33.195405] Kernel Offset: disabled [ 33.199002] Rebooting in 86400 seconds..