[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.612567] 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: [ 26.861682] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.176888] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.857434] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 28.023649] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.10.42' (ECDSA) to the list of known hosts. [ 33.559721] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 33.658552] BUG: unable to handle kernel paging request at ffffeafffd360008 [ 33.666003] IP: [] page_remove_rmap+0x2e/0x260 [ 33.672310] PGD 0 [ 33.674555] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.679494] Dumping ftrace buffer: [ 33.683005] (ftrace buffer empty) [ 33.686690] Modules linked in: [ 33.689974] CPU: 0 PID: 3724 Comm: syz-executor649 Not tainted 4.4.149-gf76bdbd #18 [ 33.698210] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.707551] task: ffff8800b1d20000 task.stack: ffff8800b1028000 [ 33.713578] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.722256] RSP: 0018:ffff8800b102f948 EFLAGS: 00010246 [ 33.727676] RAX: dffffc0000000000 RBX: ffffeafffd360000 RCX: 0000000000000000 [ 33.734925] RDX: 1ffffd5fffa6c001 RSI: ffffffff814bc8bf RDI: ffffeafffd360008 [ 33.742166] RBP: ffff8800b102f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.749409] R10: 0000000000000001 R11: ffff8800b1d20000 R12: 0000000000000001 [ 33.756651] R13: 1ffff10016205f2f R14: ffff8800b4b17800 R15: ffffeafffd360000 [ 33.764109] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.772318] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.778372] CR2: ffffeafffd360008 CR3: 00000000b1d02000 CR4: 00000000001606f0 [ 33.785621] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.792865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.800107] Stack: [ 33.802226] ffff8800b102fbd8 0000000000000001 ffff8800b102fa00 ffffffff8150a443 [ 33.810212] 00003fff4d8001e0 00003fff4d8001e0 0000000041b58ab3 ffffffff841ef837 [ 33.818310] ffffffff8150a240 00000000000004f0 ffff8800b16762c0 ffff8800b102f9c8 [ 33.826296] Call Trace: [ 33.828861] [] zap_huge_pmd+0x203/0x510 [ 33.834563] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.841118] [] unmap_single_vma+0xea3/0x1240 [ 33.847149] [] ? vm_normal_page+0x230/0x230 [ 33.853095] [] ? __put_single_page+0x60/0x60 [ 33.859128] [] unmap_vmas+0x81/0xd0 [ 33.864379] [] exit_mmap+0x1c9/0x3a0 [ 33.869718] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.876187] [] ? up_write+0x1a/0x60 [ 33.881446] [] mmput+0xf8/0x2d0 [ 33.886390] [] do_exit+0x8d8/0x26b0 [ 33.891648] [] ? file_map_prot_check+0x193/0x310 [ 33.898027] [] ? release_task.part.17+0x1200/0x1200 [ 33.904730] [] ? SyS_mprotect+0x41e/0x640 [ 33.910510] [] ? up_write+0x1a/0x60 [ 33.915762] [] ? SyS_mprotect+0x423/0x640 [ 33.921827] [] do_group_exit+0x111/0x330 [ 33.927517] [] ? do_group_exit+0x330/0x330 [ 33.933448] [] SyS_exit_group+0x1d/0x20 [ 33.939058] [] do_fast_syscall_32+0x324/0x8b0 [ 33.945182] [] sysenter_flags_fixed+0xd/0x1a [ 33.951208] 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 [ 33.978169] RIP [] page_remove_rmap+0x2e/0x260 [ 33.984502] RSP [ 33.988101] CR2: ffffeafffd360008 [ 33.991530] ---[ end trace 82571978578f465d ]--- [ 33.996262] Kernel panic - not syncing: Fatal exception [ 34.001934] Dumping ftrace buffer: [ 34.005451] (ftrace buffer empty) [ 34.009136] Kernel Offset: disabled [ 34.012736] Rebooting in 86400 seconds..