[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.506559] 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: [ 25.460753] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.950264] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.642417] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 26.815667] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 32.511575] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 32.601605] BUG: unable to handle kernel paging request at ffffeafffd390008 [ 32.608976] IP: [] page_remove_rmap+0x2e/0x260 [ 32.615225] PGD 0 [ 32.617468] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.622406] Dumping ftrace buffer: [ 32.625982] (ftrace buffer empty) [ 32.629675] Modules linked in: [ 32.632959] CPU: 1 PID: 3653 Comm: syz-executor800 Not tainted 4.4.150-g5541782 #83 [ 32.640727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.650158] task: ffff8800b398c800 task.stack: ffff8800b37c8000 [ 32.656193] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.664877] RSP: 0018:ffff8800b37cf9c0 EFLAGS: 00010246 [ 32.670306] RAX: dffffc0000000000 RBX: ffffeafffd390000 RCX: 0000000000000000 [ 32.677550] RDX: 1ffffd5fffa72001 RSI: ffffffff814bceaf RDI: ffffeafffd390008 [ 32.684799] RBP: ffff8800b37cf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.692050] R10: 0000000000000001 R11: ffff8800b398c800 R12: 0000000000000001 [ 32.699299] R13: 1ffff100166f9f3e R14: ffff8800b389b800 R15: ffffeafffd390000 [ 32.706555] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.714758] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.720619] CR2: ffffeafffd390008 CR3: 00000000b39a0000 CR4: 00000000001606f0 [ 32.727873] Stack: [ 32.729998] ffff8800b37cfc50 0000000000000001 ffff8800b37cfa78 ffffffff8150ad13 [ 32.737977] 00003fff4e4001e0 00003fff4e4001e0 0000000041b58ab3 ffffffff841ef837 [ 32.746071] ffffffff8150ab10 00000000000004f0 ffff8800b34151b8 ffff8800b37cfa40 [ 32.754122] Call Trace: [ 32.756696] [] zap_huge_pmd+0x203/0x510 [ 32.762299] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.768891] [] unmap_single_vma+0xea3/0x1240 [ 32.774933] [] ? vm_normal_page+0x280/0x280 [ 32.780889] [] ? __put_single_page+0x60/0x60 [ 32.786924] [] unmap_vmas+0x81/0xd0 [ 32.792183] [] exit_mmap+0x1c9/0x3a0 [ 32.797525] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.803995] [] ? up_write+0x1a/0x60 [ 32.809260] [] mmput+0xf8/0x2d0 [ 32.814175] [] do_exit+0x8d8/0x26b0 [ 32.819430] [] ? file_map_prot_check+0x193/0x310 [ 32.825814] [] ? release_task.part.17+0x1200/0x1200 [ 32.832455] [] ? SyS_mprotect+0x41e/0x640 [ 32.838231] [] ? up_write+0x1a/0x60 [ 32.843491] [] ? SyS_mprotect+0x423/0x640 [ 32.849267] [] do_group_exit+0x111/0x330 [ 32.854992] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.861469] [] SyS_exit_group+0x1d/0x20 [ 32.867073] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.873620] 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 [ 32.900575] RIP [] page_remove_rmap+0x2e/0x260 [ 32.906909] RSP [ 32.910507] CR2: ffffeafffd390008 [ 32.913930] ---[ end trace 50d2fb169a8e283e ]--- [ 32.918667] Kernel panic - not syncing: Fatal exception [ 32.924327] Dumping ftrace buffer: [ 32.927846] (ftrace buffer empty) [ 32.931528] Kernel Offset: disabled [ 32.935127] Rebooting in 86400 seconds..