[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.046427] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.580026] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [ 21.905396] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.559039] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 22.726732] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 28.462952] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 28.554636] BUG: unable to handle kernel paging request at ffffeafffd2f8008 [ 28.562034] IP: [] page_remove_rmap+0x2e/0x260 [ 28.568285] PGD 0 [ 28.570531] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.575503] Dumping ftrace buffer: [ 28.579014] (ftrace buffer empty) [ 28.582833] Modules linked in: [ 28.586123] CPU: 1 PID: 3812 Comm: syz-executor027 Not tainted 4.4.149-gf76bdbd #82 [ 28.593888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.603216] task: ffff8800ae3d0000 task.stack: ffff8800bbb68000 [ 28.609244] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.617924] RSP: 0018:ffff8800bbb6f9c0 EFLAGS: 00010246 [ 28.623347] RAX: dffffc0000000000 RBX: ffffeafffd2f8000 RCX: 0000000000000000 [ 28.630630] RDX: 1ffffd5fffa5f001 RSI: ffffffff814bc8bf RDI: ffffeafffd2f8008 [ 28.637876] RBP: ffff8800bbb6f9d0 R08: ffffffff85302320 R09: 0000000000000000 [ 28.645124] R10: 0000000000000001 R11: ffff8800ae3d0000 R12: 0000000000000001 [ 28.652371] R13: 1ffff1001776df3e R14: ffff8800b39b4800 R15: ffffeafffd2f8000 [ 28.659703] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.667905] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.673776] CR2: ffffeafffd2f8008 CR3: 00000000b55fc000 CR4: 00000000001606f0 [ 28.681030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.688273] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.695517] Stack: [ 28.697639] ffff8800bbb6fc50 0000000000000001 ffff8800bbb6fa78 ffffffff8150a443 [ 28.705626] 00003fff4be001e0 00003fff4be001e0 0000000041b58ab3 ffffffff841ef837 [ 28.713654] ffffffff8150a240 00000000000004f0 ffff8800b56e6bb0 ffff8800bbb6fa40 [ 28.721665] Call Trace: [ 28.724258] [] zap_huge_pmd+0x203/0x510 [ 28.729960] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.736545] [] unmap_single_vma+0xea3/0x1240 [ 28.742582] [] ? vm_normal_page+0x230/0x230 [ 28.748530] [] ? __put_single_page+0x60/0x60 [ 28.754561] [] unmap_vmas+0x81/0xd0 [ 28.759818] [] exit_mmap+0x1c9/0x3a0 [ 28.765163] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.771630] [] ? up_write+0x1a/0x60 [ 28.776881] [] mmput+0xf8/0x2d0 [ 28.781787] [] do_exit+0x8d8/0x26b0 [ 28.787038] [] ? file_map_prot_check+0x193/0x310 [ 28.793417] [] ? release_task.part.17+0x1200/0x1200 [ 28.800084] [] ? SyS_mprotect+0x41e/0x640 [ 28.805859] [] ? up_write+0x1a/0x60 [ 28.811113] [] ? SyS_mprotect+0x423/0x640 [ 28.816890] [] do_group_exit+0x111/0x330 [ 28.822584] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.829069] [] SyS_exit_group+0x1d/0x20 [ 28.834675] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.841225] 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 [ 28.868601] RIP [] page_remove_rmap+0x2e/0x260 [ 28.874932] RSP [ 28.878533] CR2: ffffeafffd2f8008 [ 28.881973] ---[ end trace 7592e2536acc1c8d ]--- [ 28.886712] Kernel panic - not syncing: Fatal exception [ 28.892702] Dumping ftrace buffer: [ 28.896223] (ftrace buffer empty) [ 28.899915] Kernel Offset: disabled [ 28.903524] Rebooting in 86400 seconds..