[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.761487] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.040992] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.547954] random: sshd: uninitialized urandom read (32 bytes read, 44 bits of entropy available) [ 28.120843] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) [ 28.308349] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 33.800845] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 33.892603] BUG: unable to handle kernel paging request at ffffeafff8be8008 [ 33.900025] IP: [] page_remove_rmap+0x2e/0x260 [ 33.906284] PGD 0 [ 33.908541] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.913489] Dumping ftrace buffer: [ 33.917003] (ftrace buffer empty) [ 33.920904] Modules linked in: [ 33.924192] CPU: 1 PID: 3843 Comm: syz-executor283 Not tainted 4.4.148-gf057ff9 #81 [ 33.931961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.941291] task: ffff8801d93fb000 task.stack: ffff8801d24a0000 [ 33.947323] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.955998] RSP: 0018:ffff8801d24a79c0 EFLAGS: 00010246 [ 33.961436] RAX: dffffc0000000000 RBX: ffffeafff8be8000 RCX: 0000000000000000 [ 33.968681] RDX: 1ffffd5fff17d001 RSI: ffffffff814bc75f RDI: ffffeafff8be8008 [ 33.975929] RBP: ffff8801d24a79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.983200] R10: 0000000000000001 R11: ffff8801d93fb000 R12: 0000000000000001 [ 33.990450] R13: 1ffff1003a494f3e R14: ffff8801cc824800 R15: ffffeafff8be8000 [ 33.997700] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.005912] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.011782] CR2: ffffeafff8be8008 CR3: 00000001cdd8e000 CR4: 00000000001606f0 [ 34.019032] Stack: [ 34.021157] ffff8801d24a7c50 0000000000000001 ffff8801d24a7a78 ffffffff8150a1f3 [ 34.029300] 00003ffe2fa001e0 00003ffe2fa001e0 0000000041b58ab3 ffffffff841ef82f [ 34.037293] ffffffff81509ff0 00000000000004f0 ffff8801cdcbe210 ffff8801d24a7a40 [ 34.045369] Call Trace: [ 34.047938] [] zap_huge_pmd+0x203/0x510 [ 34.053539] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.060322] [] unmap_single_vma+0xea3/0x1240 [ 34.066360] [] ? vm_normal_page+0x230/0x230 [ 34.072308] [] ? __put_single_page+0x60/0x60 [ 34.078346] [] unmap_vmas+0x81/0xd0 [ 34.083602] [] exit_mmap+0x1c9/0x3a0 [ 34.088946] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.095425] [] ? up_write+0x1a/0x60 [ 34.100682] [] mmput+0xf8/0x2d0 [ 34.105591] [] do_exit+0x8d8/0x26b0 [ 34.110843] [] ? file_map_prot_check+0x193/0x310 [ 34.117227] [] ? release_task.part.17+0x1200/0x1200 [ 34.123870] [] ? SyS_mprotect+0x41e/0x640 [ 34.129642] [] ? up_write+0x1a/0x60 [ 34.134893] [] ? SyS_mprotect+0x423/0x640 [ 34.140669] [] do_group_exit+0x111/0x330 [ 34.146360] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.152970] [] SyS_exit_group+0x1d/0x20 [ 34.158573] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.165122] Code: e5 41 54 53 48 89 fb e8 e1 77 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 b3 77 e9 ff f0 83 43 18 ff 78 [ 34.192403] RIP [] page_remove_rmap+0x2e/0x260 [ 34.198744] RSP [ 34.202348] CR2: ffffeafff8be8008 [ 34.205847] ---[ end trace 10e8ae9304d3ffa0 ]--- [ 34.210584] Kernel panic - not syncing: Fatal exception [ 34.216220] Dumping ftrace buffer: [ 34.219743] (ftrace buffer empty) [ 34.223430] Kernel Offset: disabled [ 34.227092] Rebooting in 86400 seconds..