[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.076730] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.198437] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.573411] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.296683] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 27.468230] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 33.242826] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 33.332599] BUG: unable to handle kernel paging request at ffffeafff8d50008 [ 33.339940] IP: [] page_remove_rmap+0x2e/0x260 [ 33.346184] PGD 0 [ 33.348475] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.353432] Dumping ftrace buffer: [ 33.356944] (ftrace buffer empty) [ 33.360628] Modules linked in: [ 33.363912] CPU: 0 PID: 3825 Comm: syz-executor249 Not tainted 4.4.149-gf76bdbd #18 [ 33.371676] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.381003] task: ffff8800aca23000 task.stack: ffff8801d8c58000 [ 33.387030] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.395698] RSP: 0018:ffff8801d8c5f948 EFLAGS: 00010246 [ 33.401118] RAX: dffffc0000000000 RBX: ffffeafff8d50000 RCX: 0000000000000000 [ 33.408361] RDX: 1ffffd5fff1aa001 RSI: ffffffff814bc8bf RDI: ffffeafff8d50008 [ 33.415607] RBP: ffff8801d8c5f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.422851] R10: 0000000000000001 R11: ffff8800aca23000 R12: 0000000000000001 [ 33.430098] R13: 1ffff1003b18bf2f R14: ffff8801c9740800 R15: ffffeafff8d50000 [ 33.437343] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.445539] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.451395] CR2: ffffeafff8d50008 CR3: 00000001da331000 CR4: 00000000001606f0 [ 33.458639] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.465888] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.473128] Stack: [ 33.475251] ffff8801d8c5fbd8 0000000000000001 ffff8801d8c5fa00 ffffffff8150a443 [ 33.483231] 00003ffe354001e0 00003ffe354001e0 0000000041b58ab3 ffffffff841ef837 [ 33.491206] ffffffff8150a240 00000000000004f0 ffff8801ce82c688 ffff8801d8c5f9c8 [ 33.499191] Call Trace: [ 33.501752] [] zap_huge_pmd+0x203/0x510 [ 33.507351] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.513917] [] unmap_single_vma+0xea3/0x1240 [ 33.519949] [] ? vm_normal_page+0x230/0x230 [ 33.525896] [] ? __put_single_page+0x60/0x60 [ 33.531925] [] unmap_vmas+0x81/0xd0 [ 33.537175] [] exit_mmap+0x1c9/0x3a0 [ 33.542517] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.548983] [] ? up_write+0x1a/0x60 [ 33.554233] [] mmput+0xf8/0x2d0 [ 33.559135] [] do_exit+0x8d8/0x26b0 [ 33.564388] [] ? handle_mm_fault+0x1a49/0x31e0 [ 33.570591] [] ? release_task.part.17+0x1200/0x1200 [ 33.577229] [] do_group_exit+0x111/0x330 [ 33.582912] [] ? do_group_exit+0x330/0x330 [ 33.588773] [] SyS_exit_group+0x1d/0x20 [ 33.594387] [] do_fast_syscall_32+0x324/0x8b0 [ 33.600509] [] sysenter_flags_fixed+0xd/0x1a [ 33.606534] 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 [ 33.633304] RIP [] page_remove_rmap+0x2e/0x260 [ 33.639630] RSP [ 33.643224] CR2: ffffeafff8d50008 [ 33.646665] ---[ end trace 0d4b1d29b03e1417 ]--- [ 33.651394] Kernel panic - not syncing: Fatal exception [ 33.657064] Dumping ftrace buffer: [ 33.660579] (ftrace buffer empty) [ 33.664260] Kernel Offset: disabled [ 33.667860] Rebooting in 86400 seconds..