[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.561111] 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: [ 26.472096] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.795275] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.468121] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 27.630116] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. [ 33.181260] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 33.274170] BUG: unable to handle kernel paging request at ffffeafff8db0008 [ 33.281526] IP: [] page_remove_rmap+0x2e/0x260 [ 33.287780] PGD 0 [ 33.290025] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.294984] Dumping ftrace buffer: [ 33.298499] (ftrace buffer empty) [ 33.302184] Modules linked in: [ 33.305534] CPU: 0 PID: 3803 Comm: syz-executor200 Not tainted 4.4.150-g5541782 #19 [ 33.313303] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.322635] task: ffff8800af278000 task.stack: ffff8801d20a8000 [ 33.328668] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.337350] RSP: 0018:ffff8801d20af948 EFLAGS: 00010246 [ 33.342771] RAX: dffffc0000000000 RBX: ffffeafff8db0000 RCX: ffffea0007248000 [ 33.350016] RDX: 1ffffd5fff1b6001 RSI: ffffffff814bceaf RDI: ffffeafff8db0008 [ 33.357260] RBP: ffff8801d20af958 R08: ffffffff85302320 R09: 0000000000000000 [ 33.364504] R10: 0000000000000001 R11: ffff8800af278000 R12: 0000000000000001 [ 33.371779] R13: 1ffff1003a415f2f R14: ffff8801d0af1808 R15: ffffeafff8db0000 [ 33.379027] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.387229] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.393083] CR2: ffffeafff8db0008 CR3: 00000001c9f42000 CR4: 00000000001606f0 [ 33.400330] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.407572] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.414811] Stack: [ 33.416932] ffff8801d20afbd8 0000000000000001 ffff8801d20afa00 ffffffff8150ad13 [ 33.424925] 00003ffe36c001a0 00003ffe36c001a0 0000000041b58ab3 ffffffff841ef837 [ 33.432960] ffffffff8150ab10 00000000000004f0 ffff8801c9a42210 ffff8801d20af9c8 [ 33.440937] Call Trace: [ 33.443508] [] zap_huge_pmd+0x203/0x510 [ 33.449108] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.455670] [] unmap_single_vma+0xea3/0x1240 [ 33.461731] [] ? vm_normal_page+0x280/0x280 [ 33.467681] [] ? __put_single_page+0x60/0x60 [ 33.473715] [] unmap_vmas+0x81/0xd0 [ 33.478967] [] exit_mmap+0x1c9/0x3a0 [ 33.484304] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.490771] [] ? up_write+0x1a/0x60 [ 33.496025] [] mmput+0xf8/0x2d0 [ 33.500924] [] do_exit+0x8d8/0x26b0 [ 33.506176] [] ? file_map_prot_check+0x193/0x310 [ 33.512559] [] ? release_task.part.17+0x1200/0x1200 [ 33.519207] [] ? SyS_mprotect+0x41e/0x640 [ 33.524983] [] ? up_write+0x1a/0x60 [ 33.530256] [] ? SyS_mprotect+0x423/0x640 [ 33.536050] [] do_group_exit+0x111/0x330 [ 33.541739] [] ? do_group_exit+0x330/0x330 [ 33.547596] [] SyS_exit_group+0x1d/0x20 [ 33.553205] [] do_fast_syscall_32+0x324/0x8b0 [ 33.559324] [] sysenter_flags_fixed+0xd/0x1a [ 33.565368] 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 [ 33.592184] RIP [] page_remove_rmap+0x2e/0x260 [ 33.598516] RSP [ 33.602127] CR2: ffffeafff8db0008 [ 33.605562] ---[ end trace 8f3881479f7ecd0e ]--- [ 33.610291] Kernel panic - not syncing: Fatal exception [ 33.616015] Dumping ftrace buffer: [ 33.619535] (ftrace buffer empty) [ 33.623222] Kernel Offset: disabled [ 33.626824] Rebooting in 86400 seconds..