[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.254275] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.737023] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.186228] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.789951] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 25.953498] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 31.627880] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 31.714540] BUG: unable to handle kernel paging request at ffffeafff8dc0008 [ 31.721913] IP: [] page_remove_rmap+0x2e/0x260 [ 31.728159] PGD 0 [ 31.730400] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.735347] Dumping ftrace buffer: [ 31.738859] (ftrace buffer empty) [ 31.742545] Modules linked in: [ 31.745831] CPU: 0 PID: 3806 Comm: syz-executor411 Not tainted 4.4.149-gf76bdbd #18 [ 31.753595] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.762942] task: ffff8801d9979800 task.stack: ffff8801da3f8000 [ 31.768982] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.777658] RSP: 0018:ffff8801da3ff948 EFLAGS: 00010246 [ 31.783080] RAX: dffffc0000000000 RBX: ffffeafff8dc0000 RCX: 0000000000000000 [ 31.790326] RDX: 1ffffd5fff1b8001 RSI: ffffffff814bc8bf RDI: ffffeafff8dc0008 [ 31.797569] RBP: ffff8801da3ff958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.804842] R10: 0000000000000001 R11: ffff8801d9979800 R12: 0000000000000001 [ 31.812097] R13: 1ffff1003b47ff2f R14: ffff8801ce9b0800 R15: ffffeafff8dc0000 [ 31.819372] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.827576] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.833432] CR2: ffffeafff8dc0008 CR3: 00000001d0315000 CR4: 00000000001606f0 [ 31.840701] Stack: [ 31.842830] ffff8801da3ffbd8 0000000000000001 ffff8801da3ffa00 ffffffff8150a443 [ 31.850834] 00003ffe370001e0 00003ffe370001e0 0000000041b58ab3 ffffffff841ef837 [ 31.858838] ffffffff8150a240 00000000000004f0 ffff8801cd8192c0 ffff8801da3ff9c8 [ 31.866830] Call Trace: [ 31.869411] [] zap_huge_pmd+0x203/0x510 [ 31.875011] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.881566] [] unmap_single_vma+0xea3/0x1240 [ 31.887598] [] ? vm_normal_page+0x230/0x230 [ 31.893545] [] ? __put_single_page+0x60/0x60 [ 31.899598] [] unmap_vmas+0x81/0xd0 [ 31.904854] [] exit_mmap+0x1c9/0x3a0 [ 31.910195] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.916665] [] ? up_write+0x1a/0x60 [ 31.921935] [] mmput+0xf8/0x2d0 [ 31.926859] [] do_exit+0x8d8/0x26b0 [ 31.932121] [] ? handle_mm_fault+0x1a49/0x31e0 [ 31.938335] [] ? release_task.part.17+0x1200/0x1200 [ 31.944974] [] do_group_exit+0x111/0x330 [ 31.950658] [] ? do_group_exit+0x330/0x330 [ 31.956518] [] SyS_exit_group+0x1d/0x20 [ 31.962127] [] do_fast_syscall_32+0x324/0x8b0 [ 31.968262] [] sysenter_flags_fixed+0xd/0x1a [ 31.974293] 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 [ 32.001228] RIP [] page_remove_rmap+0x2e/0x260 [ 32.007562] RSP [ 32.011158] CR2: ffffeafff8dc0008 [ 32.014592] ---[ end trace 83234cbd5a404346 ]--- [ 32.019321] Kernel panic - not syncing: Fatal exception [ 32.024978] Dumping ftrace buffer: [ 32.028501] (ftrace buffer empty) [ 32.032192] Kernel Offset: disabled [ 32.035799] Rebooting in 86400 seconds..