[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.822185] 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: [ 26.295875] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.760363] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.509553] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 27.684379] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) Warning: Permanently added '10.128.10.60' (ECDSA) to the list of known hosts. [ 33.669458] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) executing program [ 33.764139] BUG: unable to handle kernel paging request at ffffeafff8cd0008 [ 33.771530] IP: [] page_remove_rmap+0x2e/0x260 [ 33.777778] PGD 0 [ 33.780024] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.784991] Dumping ftrace buffer: [ 33.788504] (ftrace buffer empty) [ 33.792192] Modules linked in: [ 33.795484] CPU: 1 PID: 3694 Comm: syz-executor253 Not tainted 4.4.149-gf76bdbd #18 [ 33.803271] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.812606] task: ffff8800b2d20000 task.stack: ffff8801d2400000 [ 33.818644] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.827353] RSP: 0018:ffff8801d2407948 EFLAGS: 00010246 [ 33.832778] RAX: dffffc0000000000 RBX: ffffeafff8cd0000 RCX: 0000000000000000 [ 33.840029] RDX: 1ffffd5fff19a001 RSI: ffffffff814bc8bf RDI: ffffeafff8cd0008 [ 33.847292] RBP: ffff8801d2407958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.854545] R10: 0000000000000001 R11: ffff8800b2d20000 R12: 0000000000000001 [ 33.861796] R13: 1ffff1003a480f2f R14: ffff8801d223d800 R15: ffffeafff8cd0000 [ 33.869058] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.877269] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.883152] CR2: ffffeafff8cd0008 CR3: 00000001d2239000 CR4: 00000000001606f0 [ 33.890412] Stack: [ 33.892539] ffff8801d2407bd8 0000000000000001 ffff8801d2407a00 ffffffff8150a443 [ 33.900540] 00003ffe334001e0 00003ffe334001e0 0000000041b58ab3 ffffffff841ef837 [ 33.908536] ffffffff8150a240 00000000000004f0 ffff8801d1b9bdc0 ffff8801d24079c8 [ 33.916549] Call Trace: [ 33.919121] [] zap_huge_pmd+0x203/0x510 [ 33.924740] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.931297] [] unmap_single_vma+0xea3/0x1240 [ 33.937359] [] ? vm_normal_page+0x230/0x230 [ 33.943307] [] ? __put_single_page+0x60/0x60 [ 33.949343] [] unmap_vmas+0x81/0xd0 [ 33.954595] [] exit_mmap+0x1c9/0x3a0 [ 33.959948] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.966420] [] ? up_write+0x1a/0x60 [ 33.971676] [] mmput+0xf8/0x2d0 [ 33.976582] [] do_exit+0x8d8/0x26b0 [ 33.981842] [] ? handle_mm_fault+0x1a49/0x31e0 [ 33.988069] [] ? release_task.part.17+0x1200/0x1200 [ 33.994715] [] do_group_exit+0x111/0x330 [ 34.000408] [] ? do_group_exit+0x330/0x330 [ 34.006266] [] SyS_exit_group+0x1d/0x20 [ 34.011900] [] do_fast_syscall_32+0x324/0x8b0 [ 34.018025] [] sysenter_flags_fixed+0xd/0x1a [ 34.024095] 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 [ 34.051001] RIP [] page_remove_rmap+0x2e/0x260 [ 34.057334] RSP [ 34.060931] CR2: ffffeafff8cd0008 [ 34.064363] ---[ end trace 4d65883b1893c0e4 ]--- [ 34.069101] Kernel panic - not syncing: Fatal exception [ 34.074787] Dumping ftrace buffer: [ 34.078317] (ftrace buffer empty) [ 34.082004] Kernel Offset: disabled [ 34.085610] Rebooting in 86400 seconds..