[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.722684] 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: [ 26.252516] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.694006] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.380447] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 27.561365] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.10.17' (ECDSA) to the list of known hosts. [ 33.013004] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) executing program [ 33.098357] BUG: unable to handle kernel paging request at ffffeafff8d50008 [ 33.105917] IP: [] page_remove_rmap+0x2e/0x260 [ 33.112361] PGD 0 [ 33.114628] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.119719] Dumping ftrace buffer: [ 33.123319] (ftrace buffer empty) [ 33.127018] Modules linked in: [ 33.130336] CPU: 1 PID: 3848 Comm: syz-executor112 Not tainted 4.4.148-gf057ff9 #81 [ 33.138204] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.147678] task: ffff8801c758e000 task.stack: ffff8801d2e48000 [ 33.153719] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.162512] RSP: 0018:ffff8801d2e4f9c0 EFLAGS: 00010246 [ 33.168147] RAX: dffffc0000000000 RBX: ffffeafff8d50000 RCX: 0000000000000000 [ 33.175408] RDX: 1ffffd5fff1aa001 RSI: ffffffff814bc75f RDI: ffffeafff8d50008 [ 33.182667] RBP: ffff8801d2e4f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.189943] R10: 0000000000000001 R11: ffff8801c758e000 R12: 0000000000000001 [ 33.197203] R13: 1ffff1003a5c9f3e R14: ffff8801cd8f9800 R15: ffffeafff8d50000 [ 33.204466] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.212684] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.218692] CR2: ffffeafff8d50008 CR3: 00000001d0de2000 CR4: 00000000001606f0 [ 33.225967] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.233235] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.240497] Stack: [ 33.242636] ffff8801d2e4fc50 0000000000000001 ffff8801d2e4fa78 ffffffff8150a1f3 [ 33.250692] 00003ffe354001e0 00003ffe354001e0 0000000041b58ab3 ffffffff841ef82f [ 33.258823] ffffffff81509ff0 00000000000004f0 ffff8801cdb92e70 ffff8801d2e4fa40 [ 33.266933] Call Trace: [ 33.269515] [] zap_huge_pmd+0x203/0x510 [ 33.275257] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.281911] [] unmap_single_vma+0xea3/0x1240 [ 33.287967] [] ? vm_normal_page+0x230/0x230 [ 33.294023] [] ? __put_single_page+0x60/0x60 [ 33.300075] [] unmap_vmas+0x81/0xd0 [ 33.305466] [] exit_mmap+0x1c9/0x3a0 [ 33.310834] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.317329] [] ? up_write+0x1a/0x60 [ 33.322600] [] mmput+0xf8/0x2d0 [ 33.327526] [] do_exit+0x8d8/0x26b0 [ 33.332799] [] ? file_map_prot_check+0x193/0x310 [ 33.339201] [] ? release_task.part.17+0x1200/0x1200 [ 33.345862] [] ? SyS_mprotect+0x41e/0x640 [ 33.351657] [] ? up_write+0x1a/0x60 [ 33.356928] [] ? SyS_mprotect+0x423/0x640 [ 33.362720] [] do_group_exit+0x111/0x330 [ 33.368681] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.375177] [] SyS_exit_group+0x1d/0x20 [ 33.380806] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.387374] 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 [ 33.415489] RIP [] page_remove_rmap+0x2e/0x260 [ 33.421878] RSP [ 33.425491] CR2: ffffeafff8d50008 [ 33.428932] ---[ end trace fb218617b834f5c7 ]--- [ 33.433674] Kernel panic - not syncing: Fatal exception [ 33.439577] Dumping ftrace buffer: [ 33.443116] (ftrace buffer empty) [ 33.446814] Kernel Offset: disabled [ 33.450516] Rebooting in 86400 seconds..