[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.678323] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.024735] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.348715] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.957399] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 44.134869] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.15.201' (ECDSA) to the list of known hosts. [ 49.584849] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 49.672192] BUG: unable to handle kernel paging request at ffffeafff8d68008 [ 49.679715] IP: [] page_remove_rmap+0x2e/0x260 [ 49.686249] PGD 0 [ 49.688598] Oops: 0000 [#1] PREEMPT SMP KASAN [ 49.693550] Dumping ftrace buffer: [ 49.697079] (ftrace buffer empty) [ 49.700766] Modules linked in: [ 49.704059] CPU: 1 PID: 3776 Comm: syz-executor596 Not tainted 4.4.148-gf057ff9 #81 [ 49.711968] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.721298] task: ffff8800b3ed6000 task.stack: ffff8801d9878000 [ 49.727389] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 49.736116] RSP: 0018:ffff8801d987f9c0 EFLAGS: 00010246 [ 49.741539] RAX: dffffc0000000000 RBX: ffffeafff8d68000 RCX: ffffea0007290000 [ 49.748784] RDX: 1ffffd5fff1ad001 RSI: ffffffff814bc75f RDI: ffffeafff8d68008 [ 49.756028] RBP: ffff8801d987f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 49.763278] R10: 0000000000000001 R11: ffff8800b3ed6000 R12: 0000000000000001 [ 49.770524] R13: 1ffff1003b30ff3e R14: ffff8801ccad7808 R15: ffffeafff8d68000 [ 49.777774] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 49.786098] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.791958] CR2: ffffeafff8d68008 CR3: 00000001cb681000 CR4: 00000000001606f0 [ 49.799222] Stack: [ 49.801358] ffff8801d987fc50 0000000000000001 ffff8801d987fa78 ffffffff8150a1f3 [ 49.809460] 00003ffe35a001a0 00003ffe35a001a0 0000000041b58ab3 ffffffff841ef82f [ 49.817527] ffffffff81509ff0 00000000000004f0 ffff8801cbf32478 ffff8801d987fa40 [ 49.825571] Call Trace: [ 49.828137] [] zap_huge_pmd+0x203/0x510 [ 49.833742] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 49.840302] [] unmap_single_vma+0xea3/0x1240 [ 49.846341] [] ? vm_normal_page+0x230/0x230 [ 49.852291] [] ? __put_single_page+0x60/0x60 [ 49.858329] [] unmap_vmas+0x81/0xd0 [ 49.863587] [] exit_mmap+0x1c9/0x3a0 [ 49.869159] [] ? SyS_remap_file_pages+0x870/0x870 [ 49.875638] [] ? up_write+0x1a/0x60 [ 49.880898] [] mmput+0xf8/0x2d0 [ 49.885810] [] do_exit+0x8d8/0x26b0 [ 49.891076] [] ? file_map_prot_check+0x193/0x310 [ 49.897461] [] ? release_task.part.17+0x1200/0x1200 [ 49.904270] [] ? SyS_mprotect+0x41e/0x640 [ 49.910092] [] ? up_write+0x1a/0x60 [ 49.915507] [] ? SyS_mprotect+0x423/0x640 [ 49.921282] [] do_group_exit+0x111/0x330 [ 49.927069] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 49.933640] [] SyS_exit_group+0x1d/0x20 [ 49.939247] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 49.945837] 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 [ 49.973167] RIP [] page_remove_rmap+0x2e/0x260 [ 49.979625] RSP [ 49.983223] CR2: ffffeafff8d68008 [ 49.986660] ---[ end trace 0962ae4cdb6f83af ]--- [ 49.991391] Kernel panic - not syncing: Fatal exception [ 49.997192] Dumping ftrace buffer: [ 50.000717] (ftrace buffer empty) [ 50.004405] Kernel Offset: disabled [ 50.008014] Rebooting in 86400 seconds..