[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.560443] 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: [ 30.117824] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 30.538786] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.300614] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 31.473249] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 37.029989] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 37.117921] BUG: unable to handle kernel paging request at ffffeafffd440008 [ 37.125270] IP: [] page_remove_rmap+0x2e/0x260 [ 37.131522] PGD 0 [ 37.133771] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.138751] Dumping ftrace buffer: [ 37.142264] (ftrace buffer empty) [ 37.146083] Modules linked in: [ 37.149384] CPU: 0 PID: 3802 Comm: syz-executor124 Not tainted 4.4.148-gf057ff9 #81 [ 37.157151] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.166488] task: ffff8800ae958000 task.stack: ffff8800bbb70000 [ 37.172525] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 37.181235] RSP: 0018:ffff8800bbb779c0 EFLAGS: 00010246 [ 37.186674] RAX: dffffc0000000000 RBX: ffffeafffd440000 RCX: 0000000000000000 [ 37.193920] RDX: 1ffffd5fffa88001 RSI: ffffffff814bc75f RDI: ffffeafffd440008 [ 37.201168] RBP: ffff8800bbb779d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 37.208418] R10: 0000000000000001 R11: ffff8800ae958000 R12: 0000000000000001 [ 37.215678] R13: 1ffff1001776ef3e R14: ffff8800b1ddc800 R15: ffffeafffd440000 [ 37.222921] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.231118] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.236979] CR2: ffffeafffd440008 CR3: 00000000af1ff000 CR4: 00000000001606f0 [ 37.244253] Stack: [ 37.246588] ffff8800bbb77c50 0000000000000001 ffff8800bbb77a78 ffffffff8150a1f3 [ 37.254566] 00003fff510001e0 00003fff510001e0 0000000041b58ab3 ffffffff841ef82f [ 37.262590] ffffffff81509ff0 00000000000004f0 ffff8800b53f2580 ffff8800bbb77a40 [ 37.270599] Call Trace: [ 37.273168] [] zap_huge_pmd+0x203/0x510 [ 37.278776] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 37.285330] [] unmap_single_vma+0xea3/0x1240 [ 37.291363] [] ? vm_normal_page+0x230/0x230 [ 37.297307] [] ? __put_single_page+0x60/0x60 [ 37.303338] [] unmap_vmas+0x81/0xd0 [ 37.308594] [] exit_mmap+0x1c9/0x3a0 [ 37.313947] [] ? SyS_remap_file_pages+0x870/0x870 [ 37.320416] [] ? up_write+0x1a/0x60 [ 37.325679] [] mmput+0xf8/0x2d0 [ 37.330581] [] do_exit+0x8d8/0x26b0 [ 37.335833] [] ? file_map_prot_check+0x193/0x310 [ 37.342217] [] ? release_task.part.17+0x1200/0x1200 [ 37.348859] [] ? SyS_mprotect+0x41e/0x640 [ 37.354635] [] ? up_write+0x1a/0x60 [ 37.359906] [] ? SyS_mprotect+0x423/0x640 [ 37.365693] [] do_group_exit+0x111/0x330 [ 37.371399] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 37.377865] [] SyS_exit_group+0x1d/0x20 [ 37.383480] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 37.390056] 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 [ 37.417023] RIP [] page_remove_rmap+0x2e/0x260 [ 37.423382] RSP [ 37.427001] CR2: ffffeafffd440008 [ 37.430431] ---[ end trace cf7b05cdb698dd14 ]--- [ 37.435183] Kernel panic - not syncing: Fatal exception [ 37.440820] Dumping ftrace buffer: [ 37.444338] (ftrace buffer empty) [ 37.448025] Kernel Offset: disabled [ 37.451627] Rebooting in 86400 seconds..