[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.897964] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.707880] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 20.895625] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.539101] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 36.925167] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts. [ 42.562976] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 42.659948] BUG: unable to handle kernel paging request at ffffeafff8d30008 [ 42.667387] IP: [] page_remove_rmap+0x2e/0x260 [ 42.673649] PGD 0 [ 42.675887] Oops: 0000 [#1] PREEMPT SMP KASAN [ 42.680935] Dumping ftrace buffer: [ 42.684458] (ftrace buffer empty) [ 42.688296] Modules linked in: [ 42.691597] CPU: 0 PID: 3847 Comm: syz-executor202 Not tainted 4.4.150-g5541782 #19 [ 42.699431] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.708768] task: ffff8800ac86e000 task.stack: ffff8801d9718000 [ 42.714795] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 42.723486] RSP: 0018:ffff8801d971f948 EFLAGS: 00010246 [ 42.728906] RAX: dffffc0000000000 RBX: ffffeafff8d30000 RCX: 0000000000000000 [ 42.736150] RDX: 1ffffd5fff1a6001 RSI: ffffffff814bceaf RDI: ffffeafff8d30008 [ 42.743398] RBP: ffff8801d971f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 42.750867] R10: 0000000000000001 R11: ffff8800ac86e000 R12: 0000000000000001 [ 42.758153] R13: 1ffff1003b2e3f2f R14: ffff8801cdd2b800 R15: ffffeafff8d30000 [ 42.765470] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 42.773693] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 42.779552] CR2: ffffeafff8d30008 CR3: 00000001ccc28000 CR4: 00000000001606f0 [ 42.786904] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.794195] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.801445] Stack: [ 42.803583] ffff8801d971fbd8 0000000000000001 ffff8801d971fa00 ffffffff8150ad13 [ 42.811721] 00003ffe34c001e0 00003ffe34c001e0 0000000041b58ab3 ffffffff841ef837 [ 42.819695] ffffffff8150ab10 00000000000004f0 ffff8801d91f3e70 ffff8801d971f9c8 [ 42.827841] Call Trace: [ 42.830408] [] zap_huge_pmd+0x203/0x510 [ 42.836084] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 42.842733] [] unmap_single_vma+0xea3/0x1240 [ 42.848817] [] ? vm_normal_page+0x280/0x280 [ 42.854772] [] ? __put_single_page+0x60/0x60 [ 42.860809] [] unmap_vmas+0x81/0xd0 [ 42.866139] [] exit_mmap+0x1c9/0x3a0 [ 42.871484] [] ? SyS_remap_file_pages+0x870/0x870 [ 42.877955] [] ? up_write+0x1a/0x60 [ 42.883216] [] mmput+0xf8/0x2d0 [ 42.888119] [] do_exit+0x8d8/0x26b0 [ 42.893371] [] ? file_map_prot_check+0x193/0x310 [ 42.899747] [] ? release_task.part.17+0x1200/0x1200 [ 42.906391] [] ? SyS_mprotect+0x41e/0x640 [ 42.912164] [] ? up_write+0x1a/0x60 [ 42.917412] [] ? SyS_mprotect+0x423/0x640 [ 42.923181] [] do_group_exit+0x111/0x330 [ 42.928974] [] ? do_group_exit+0x330/0x330 [ 42.934835] [] SyS_exit_group+0x1d/0x20 [ 42.940480] [] do_fast_syscall_32+0x324/0x8b0 [ 42.946691] [] sysenter_flags_fixed+0xd/0x1a [ 42.952838] 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 [ 42.979927] RIP [] page_remove_rmap+0x2e/0x260 [ 42.986264] RSP [ 42.989859] CR2: ffffeafff8d30008 [ 42.993284] ---[ end trace ad66a96978cc38ab ]--- [ 42.998011] Kernel panic - not syncing: Fatal exception [ 43.003728] Dumping ftrace buffer: [ 43.007245] (ftrace buffer empty) [ 43.010927] Kernel Offset: disabled [ 43.014524] Rebooting in 86400 seconds..