[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.982244] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.036325] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.717927] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.459138] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 25.626642] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 31.169080] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 31.253977] BUG: unable to handle kernel paging request at ffffeafffd3c8008 [ 31.261327] IP: [] page_remove_rmap+0x2e/0x260 [ 31.267571] PGD 0 [ 31.269806] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.274750] Dumping ftrace buffer: [ 31.278262] (ftrace buffer empty) [ 31.281945] Modules linked in: [ 31.285238] CPU: 0 PID: 3833 Comm: syz-executor564 Not tainted 4.4.150-g5541782 #19 [ 31.293023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.302372] task: ffff8801d8c30000 task.stack: ffff8801d93f0000 [ 31.308402] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.317078] RSP: 0018:ffff8801d93f7948 EFLAGS: 00010246 [ 31.322510] RAX: dffffc0000000000 RBX: ffffeafffd3c8000 RCX: 0000000000000000 [ 31.329760] RDX: 1ffffd5fffa79001 RSI: ffffffff814bceaf RDI: ffffeafffd3c8008 [ 31.337005] RBP: ffff8801d93f7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.344248] R10: 0000000000000001 R11: ffff8801d8c30000 R12: 0000000000000001 [ 31.351497] R13: 1ffff1003b27ef2f R14: ffff8800afe84800 R15: ffffeafffd3c8000 [ 31.358745] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.366948] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.372850] CR2: ffffeafffd3c8008 CR3: 00000000afcd1000 CR4: 00000000001606f0 [ 31.380106] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.387369] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.394613] Stack: [ 31.396736] ffff8801d93f7bd8 0000000000000001 ffff8801d93f7a00 ffffffff8150ad13 [ 31.404717] 00003fff4f2001e0 00003fff4f2001e0 0000000041b58ab3 ffffffff841ef837 [ 31.412698] ffffffff8150ab10 00000000000004f0 ffff8800ad53cbb0 ffff8801d93f79c8 [ 31.420679] Call Trace: [ 31.423242] [] zap_huge_pmd+0x203/0x510 [ 31.428840] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.435396] [] unmap_single_vma+0xea3/0x1240 [ 31.441430] [] ? vm_normal_page+0x280/0x280 [ 31.447376] [] ? __put_single_page+0x60/0x60 [ 31.453409] [] unmap_vmas+0x81/0xd0 [ 31.458663] [] exit_mmap+0x1c9/0x3a0 [ 31.464002] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.470473] [] ? up_write+0x1a/0x60 [ 31.475726] [] mmput+0xf8/0x2d0 [ 31.480629] [] do_exit+0x8d8/0x26b0 [ 31.485884] [] ? file_map_prot_check+0x193/0x310 [ 31.492265] [] ? release_task.part.17+0x1200/0x1200 [ 31.498909] [] ? SyS_mprotect+0x41e/0x640 [ 31.504911] [] ? up_write+0x1a/0x60 [ 31.510165] [] ? SyS_mprotect+0x423/0x640 [ 31.515939] [] do_group_exit+0x111/0x330 [ 31.521626] [] ? do_group_exit+0x330/0x330 [ 31.527506] [] SyS_exit_group+0x1d/0x20 [ 31.533118] [] do_fast_syscall_32+0x324/0x8b0 [ 31.539241] [] sysenter_flags_fixed+0xd/0x1a [ 31.545271] 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 [ 31.571987] RIP [] page_remove_rmap+0x2e/0x260 [ 31.578326] RSP [ 31.581927] CR2: ffffeafffd3c8008 [ 31.585353] ---[ end trace 8999f7b82fb8f0de ]--- [ 31.590087] Kernel panic - not syncing: Fatal exception [ 31.595872] Dumping ftrace buffer: [ 31.599392] (ftrace buffer empty) [ 31.603078] Kernel Offset: disabled [ 31.606689] Rebooting in 86400 seconds..