[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.542102] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.338189] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.803346] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.547204] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) [ 25.733862] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 31.254806] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) executing program [ 31.340777] BUG: unable to handle kernel paging request at ffffeafffd438008 [ 31.348136] IP: [] page_remove_rmap+0x2e/0x260 [ 31.354384] PGD 0 [ 31.356627] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.361581] Dumping ftrace buffer: [ 31.365113] (ftrace buffer empty) [ 31.368802] Modules linked in: [ 31.372089] CPU: 0 PID: 3840 Comm: syz-executor092 Not tainted 4.4.149-gf76bdbd #82 [ 31.379867] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.389199] task: ffff8800bb2ac800 task.stack: ffff8800ac5b8000 [ 31.395230] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.403924] RSP: 0018:ffff8800ac5bf9c0 EFLAGS: 00010246 [ 31.409350] RAX: dffffc0000000000 RBX: ffffeafffd438000 RCX: 0000000000000000 [ 31.416602] RDX: 1ffffd5fffa87001 RSI: ffffffff814bc8bf RDI: ffffeafffd438008 [ 31.423847] RBP: ffff8800ac5bf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.431095] R10: 0000000000000001 R11: ffff8800bb2ac800 R12: 0000000000000001 [ 31.438341] R13: 1ffff100158b7f3e R14: ffff8800aec69800 R15: ffffeafffd438000 [ 31.445592] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.453793] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.459651] CR2: ffffeafffd438008 CR3: 00000000ac432000 CR4: 00000000001606f0 [ 31.466897] Stack: [ 31.469023] ffff8800ac5bfc50 0000000000000001 ffff8800ac5bfa78 ffffffff8150a443 [ 31.477039] 00003fff50e001e0 00003fff50e001e0 0000000041b58ab3 ffffffff841ef837 [ 31.485040] ffffffff8150a240 00000000000004f0 ffff8801cadd5f20 ffff8800ac5bfa40 [ 31.493054] Call Trace: [ 31.495619] [] zap_huge_pmd+0x203/0x510 [ 31.501233] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.507789] [] unmap_single_vma+0xea3/0x1240 [ 31.513821] [] ? vm_normal_page+0x230/0x230 [ 31.519770] [] ? __put_single_page+0x60/0x60 [ 31.525802] [] unmap_vmas+0x81/0xd0 [ 31.531053] [] exit_mmap+0x1c9/0x3a0 [ 31.536420] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.542889] [] ? up_write+0x1a/0x60 [ 31.548146] [] mmput+0xf8/0x2d0 [ 31.553049] [] do_exit+0x8d8/0x26b0 [ 31.558302] [] ? file_map_prot_check+0x193/0x310 [ 31.564686] [] ? release_task.part.17+0x1200/0x1200 [ 31.571328] [] ? SyS_mprotect+0x41e/0x640 [ 31.577109] [] ? up_write+0x1a/0x60 [ 31.582398] [] ? SyS_mprotect+0x423/0x640 [ 31.588171] [] do_group_exit+0x111/0x330 [ 31.593872] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.600344] [] SyS_exit_group+0x1d/0x20 [ 31.605957] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.612508] 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 [ 31.639569] RIP [] page_remove_rmap+0x2e/0x260 [ 31.645907] RSP [ 31.649524] CR2: ffffeafffd438008 [ 31.652954] ---[ end trace abf567c0157f5af2 ]--- [ 31.657685] Kernel panic - not syncing: Fatal exception [ 31.663341] Dumping ftrace buffer: [ 31.666884] (ftrace buffer empty) [ 31.670573] Kernel Offset: disabled [ 31.674193] Rebooting in 86400 seconds..