[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.798367] 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: [ 30.855406] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.283078] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.949714] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 32.136203] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 37.775566] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 37.862082] BUG: unable to handle kernel paging request at ffffeafff8d88008 [ 37.869436] IP: [] page_remove_rmap+0x2e/0x260 [ 37.875715] PGD 0 [ 37.877959] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.882900] Dumping ftrace buffer: [ 37.886431] (ftrace buffer empty) [ 37.890119] Modules linked in: [ 37.893406] CPU: 1 PID: 3862 Comm: syz-executor057 Not tainted 4.4.150-g5541782 #19 [ 37.901171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.910509] task: ffff8800b2bf4800 task.stack: ffff8801d9508000 [ 37.916541] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 37.925220] RSP: 0018:ffff8801d950f948 EFLAGS: 00010246 [ 37.930644] RAX: dffffc0000000000 RBX: ffffeafff8d88000 RCX: 0000000000000000 [ 37.937886] RDX: 1ffffd5fff1b1001 RSI: ffffffff814bceaf RDI: ffffeafff8d88008 [ 37.945180] RBP: ffff8801d950f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 37.952436] R10: 0000000000000001 R11: ffff8800b2bf4800 R12: 0000000000000001 [ 37.959680] R13: 1ffff1003b2a1f2f R14: ffff8801d3046800 R15: ffffeafff8d88000 [ 37.966923] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.975121] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 37.981102] CR2: ffffeafff8d88008 CR3: 00000001d9541000 CR4: 00000000001606f0 [ 37.988545] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.995794] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.003040] Stack: [ 38.005370] ffff8801d950fbd8 0000000000000001 ffff8801d950fa00 ffffffff8150ad13 [ 38.013375] 00003ffe362001e0 00003ffe362001e0 0000000041b58ab3 ffffffff841ef837 [ 38.021366] ffffffff8150ab10 00000000000004f0 ffff8801c995d738 ffff8801d950f9c8 [ 38.029403] Call Trace: [ 38.031987] [] zap_huge_pmd+0x203/0x510 [ 38.037590] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 38.044379] [] unmap_single_vma+0xea3/0x1240 [ 38.050413] [] ? vm_normal_page+0x280/0x280 [ 38.056359] [] ? __put_single_page+0x60/0x60 [ 38.062395] [] unmap_vmas+0x81/0xd0 [ 38.067648] [] exit_mmap+0x1c9/0x3a0 [ 38.072986] [] ? SyS_remap_file_pages+0x870/0x870 [ 38.079458] [] ? up_write+0x1a/0x60 [ 38.084711] [] mmput+0xf8/0x2d0 [ 38.089617] [] do_exit+0x8d8/0x26b0 [ 38.094874] [] ? file_map_prot_check+0x193/0x310 [ 38.101255] [] ? release_task.part.17+0x1200/0x1200 [ 38.107898] [] ? SyS_mprotect+0x41e/0x640 [ 38.113676] [] ? up_write+0x1a/0x60 [ 38.118932] [] ? SyS_mprotect+0x423/0x640 [ 38.124706] [] do_group_exit+0x111/0x330 [ 38.130401] [] ? do_group_exit+0x330/0x330 [ 38.136273] [] SyS_exit_group+0x1d/0x20 [ 38.141876] [] do_fast_syscall_32+0x324/0x8b0 [ 38.147999] [] sysenter_flags_fixed+0xd/0x1a [ 38.154033] 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 [ 38.180917] RIP [] page_remove_rmap+0x2e/0x260 [ 38.187257] RSP [ 38.190856] CR2: ffffeafff8d88008 [ 38.194288] ---[ end trace 9332335e0166257f ]--- [ 38.199021] Kernel panic - not syncing: Fatal exception [ 38.204788] Dumping ftrace buffer: [ 38.208314] (ftrace buffer empty) [ 38.212006] Kernel Offset: disabled [ 38.215611] Rebooting in 86400 seconds..