[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.386273] 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: [ 25.738050] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.306641] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 26.896373] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) [ 27.057735] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 32.932971] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 33.026335] BUG: unable to handle kernel paging request at ffffeafff8ce0008 [ 33.033818] IP: [] page_remove_rmap+0x2e/0x260 [ 33.040070] PGD 0 [ 33.042315] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.047378] Dumping ftrace buffer: [ 33.050892] (ftrace buffer empty) [ 33.054587] Modules linked in: [ 33.057877] CPU: 1 PID: 3827 Comm: syz-executor188 Not tainted 4.4.150-g5541782 #19 [ 33.065643] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.074979] task: ffff8801d97ec800 task.stack: ffff8800bb900000 [ 33.081014] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.089701] RSP: 0018:ffff8800bb907948 EFLAGS: 00010246 [ 33.095128] RAX: dffffc0000000000 RBX: ffffeafff8ce0000 RCX: 0000000000000000 [ 33.102379] RDX: 1ffffd5fff19c001 RSI: ffffffff814bceaf RDI: ffffeafff8ce0008 [ 33.109664] RBP: ffff8800bb907958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.117023] R10: 0000000000000001 R11: ffff8801d97ec800 R12: 0000000000000001 [ 33.124270] R13: 1ffff10017720f2f R14: ffff8801d19e6800 R15: ffffeafff8ce0000 [ 33.131521] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.139728] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.145587] CR2: ffffeafff8ce0008 CR3: 00000001cc246000 CR4: 00000000001606f0 [ 33.152874] Stack: [ 33.155021] ffff8800bb907bd8 0000000000000001 ffff8800bb907a00 ffffffff8150ad13 [ 33.163017] 00003ffe338001e0 00003ffe338001e0 0000000041b58ab3 ffffffff841ef837 [ 33.171080] ffffffff8150ab10 00000000000004f0 ffff8801cf142210 ffff8800bb9079c8 [ 33.179075] Call Trace: [ 33.181646] [] zap_huge_pmd+0x203/0x510 [ 33.187247] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.193803] [] unmap_single_vma+0xea3/0x1240 [ 33.199840] [] ? vm_normal_page+0x280/0x280 [ 33.205793] [] ? __put_single_page+0x60/0x60 [ 33.211827] [] unmap_vmas+0x81/0xd0 [ 33.217083] [] exit_mmap+0x1c9/0x3a0 [ 33.222425] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.228894] [] ? up_write+0x1a/0x60 [ 33.234207] [] mmput+0xf8/0x2d0 [ 33.239123] [] do_exit+0x8d8/0x26b0 [ 33.244382] [] ? file_map_prot_check+0x193/0x310 [ 33.250768] [] ? release_task.part.17+0x1200/0x1200 [ 33.257419] [] ? SyS_mprotect+0x41e/0x640 [ 33.263215] [] ? up_write+0x1a/0x60 [ 33.268478] [] ? SyS_mprotect+0x423/0x640 [ 33.274260] [] do_group_exit+0x111/0x330 [ 33.279952] [] ? do_group_exit+0x330/0x330 [ 33.285813] [] SyS_exit_group+0x1d/0x20 [ 33.291418] [] do_fast_syscall_32+0x324/0x8b0 [ 33.297588] [] sysenter_flags_fixed+0xd/0x1a [ 33.303664] 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 [ 33.330918] RIP [] page_remove_rmap+0x2e/0x260 [ 33.337252] RSP [ 33.340851] CR2: ffffeafff8ce0008 [ 33.344279] ---[ end trace 538a7a2b83e27667 ]--- [ 33.349008] Kernel panic - not syncing: Fatal exception [ 33.354642] Dumping ftrace buffer: [ 33.358162] (ftrace buffer empty) [ 33.361845] Kernel Offset: disabled [ 33.365446] Rebooting in 86400 seconds..