[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.428134] 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: [ 25.402040] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.824386] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.473987] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 26.633971] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 32.214582] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 32.300992] BUG: unable to handle kernel paging request at ffffeafff8c88008 [ 32.308374] IP: [] page_remove_rmap+0x2e/0x260 [ 32.314651] PGD 0 [ 32.316891] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.321854] Dumping ftrace buffer: [ 32.325382] (ftrace buffer empty) [ 32.329069] Modules linked in: [ 32.332357] CPU: 1 PID: 3847 Comm: syz-executor037 Not tainted 4.4.150-g5541782 #19 [ 32.340248] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.349585] task: ffff8800bb06e000 task.stack: ffff8801c88c0000 [ 32.355619] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.364302] RSP: 0018:ffff8801c88c7948 EFLAGS: 00010246 [ 32.369837] RAX: dffffc0000000000 RBX: ffffeafff8c88000 RCX: 0000000000000000 [ 32.377086] RDX: 1ffffd5fff191001 RSI: ffffffff814bceaf RDI: ffffeafff8c88008 [ 32.384345] RBP: ffff8801c88c7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.391594] R10: 0000000000000001 R11: ffff8800bb06e000 R12: 0000000000000001 [ 32.398939] R13: 1ffff10039118f2f R14: ffff8801d0b68800 R15: ffffeafff8c88000 [ 32.406189] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.414391] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.420372] CR2: ffffeafff8c88008 CR3: 00000001ce7f5000 CR4: 00000000001606f0 [ 32.427628] Stack: [ 32.429763] ffff8801c88c7bd8 0000000000000001 ffff8801c88c7a00 ffffffff8150ad13 [ 32.437773] 00003ffe322001e0 00003ffe322001e0 0000000041b58ab3 ffffffff841ef837 [ 32.445778] ffffffff8150ab10 00000000000004f0 ffff8801d250fe70 ffff8801c88c79c8 [ 32.453823] Call Trace: [ 32.456390] [] zap_huge_pmd+0x203/0x510 [ 32.461995] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.468555] [] unmap_single_vma+0xea3/0x1240 [ 32.474594] [] ? vm_normal_page+0x280/0x280 [ 32.480559] [] ? __put_single_page+0x60/0x60 [ 32.486596] [] unmap_vmas+0x81/0xd0 [ 32.491849] [] exit_mmap+0x1c9/0x3a0 [ 32.497190] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.503661] [] ? up_write+0x1a/0x60 [ 32.508917] [] mmput+0xf8/0x2d0 [ 32.513828] [] do_exit+0x8d8/0x26b0 [ 32.519085] [] ? file_map_prot_check+0x193/0x310 [ 32.525471] [] ? release_task.part.17+0x1200/0x1200 [ 32.532117] [] ? SyS_mprotect+0x41e/0x640 [ 32.537996] [] ? up_write+0x1a/0x60 [ 32.543248] [] ? SyS_mprotect+0x423/0x640 [ 32.549112] [] do_group_exit+0x111/0x330 [ 32.554805] [] ? do_group_exit+0x330/0x330 [ 32.560671] [] SyS_exit_group+0x1d/0x20 [ 32.566274] [] do_fast_syscall_32+0x324/0x8b0 [ 32.572669] [] sysenter_flags_fixed+0xd/0x1a [ 32.578704] 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 [ 32.605816] RIP [] page_remove_rmap+0x2e/0x260 [ 32.612148] RSP [ 32.615744] CR2: ffffeafff8c88008 [ 32.619187] ---[ end trace 72d5f98fdafd578a ]--- [ 32.624045] Kernel panic - not syncing: Fatal exception [ 32.629700] Dumping ftrace buffer: [ 32.633221] (ftrace buffer empty) [ 32.636904] Kernel Offset: disabled [ 32.640506] Rebooting in 86400 seconds..