[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.887579] 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: [ 25.082803] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.533274] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 26.246985] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) [ 26.427419] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 31.988453] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 32.076788] BUG: unable to handle kernel paging request at ffffeafffd230008 [ 32.084152] IP: [] page_remove_rmap+0x2e/0x260 [ 32.090398] PGD 0 [ 32.092641] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.097630] Dumping ftrace buffer: [ 32.101142] (ftrace buffer empty) [ 32.104826] Modules linked in: [ 32.108113] CPU: 0 PID: 3832 Comm: syz-executor490 Not tainted 4.4.149-gf76bdbd #82 [ 32.115887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.125224] task: ffff8800ad6fc800 task.stack: ffff8800bb2a8000 [ 32.131290] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.131295] RSP: 0018:ffff8800bb2af9c0 EFLAGS: 00010246 [ 32.131299] RAX: dffffc0000000000 RBX: ffffeafffd230000 RCX: ffffea0002dc8000 [ 32.131316] RDX: 1ffffd5fffa46001 RSI: ffffffff814bc8bf RDI: ffffeafffd230008 [ 32.131320] RBP: ffff8800bb2af9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.131324] R10: 0000000000000001 R11: ffff8800ad6fc800 R12: 0000000000000001 [ 32.131327] R13: 1ffff10017655f3e R14: ffff8800adb90810 R15: ffffeafffd230000 [ 32.131333] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.131337] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.131341] CR2: ffffeafffd230008 CR3: 00000000adb8f000 CR4: 00000000001606f0 [ 32.131347] Stack: [ 32.131356] ffff8800bb2afc50 0000000000000001 ffff8800bb2afa78 ffffffff8150a443 [ 32.131365] 00003fff48c001a0 00003fff48c001a0 0000000041b58ab3 ffffffff841ef837 [ 32.131374] ffffffff8150a240 00000000000004f0 ffff8800b0b49ec8 ffff8800bb2afa40 [ 32.131376] Call Trace: [ 32.131387] [] zap_huge_pmd+0x203/0x510 [ 32.131396] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.131403] [] unmap_single_vma+0xea3/0x1240 [ 32.131411] [] ? vm_normal_page+0x230/0x230 [ 32.131419] [] ? __put_single_page+0x60/0x60 [ 32.131426] [] unmap_vmas+0x81/0xd0 [ 32.131433] [] exit_mmap+0x1c9/0x3a0 [ 32.131441] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.131449] [] ? up_write+0x1a/0x60 [ 32.131457] [] mmput+0xf8/0x2d0 [ 32.131464] [] do_exit+0x8d8/0x26b0 [ 32.131474] [] ? file_map_prot_check+0x193/0x310 [ 32.131481] [] ? release_task.part.17+0x1200/0x1200 [ 32.131489] [] ? SyS_mprotect+0x41e/0x640 [ 32.131496] [] ? up_write+0x1a/0x60 [ 32.131503] [] ? SyS_mprotect+0x423/0x640 [ 32.131511] [] do_group_exit+0x111/0x330 [ 32.131518] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.131525] [] SyS_exit_group+0x1d/0x20 [ 32.131534] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.131645] 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 [ 32.131654] RIP [] page_remove_rmap+0x2e/0x260 [ 32.131656] RSP [ 32.131659] CR2: ffffeafffd230008 [ 32.131666] ---[ end trace 1c78e5ca19da92fd ]--- [ 32.131670] Kernel panic - not syncing: Fatal exception [ 32.140185] Dumping ftrace buffer: [ 32.140189] (ftrace buffer empty) [ 32.140192] Kernel Offset: disabled [ 32.400048] Rebooting in 86400 seconds..