[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.849757] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 22.618133] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.909024] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.645845] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 23.821036] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 29.450946] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 29.536450] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 29.543806] IP: [] page_remove_rmap+0x2e/0x260 [ 29.550054] PGD 0 [ 29.552337] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.557274] Dumping ftrace buffer: [ 29.560787] (ftrace buffer empty) [ 29.564470] Modules linked in: [ 29.567759] CPU: 1 PID: 3833 Comm: syz-executor497 Not tainted 4.4.148-gf057ff9 #81 [ 29.575539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.584871] task: ffff8800acdd4800 task.stack: ffff8800bb9b8000 [ 29.590901] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.599590] RSP: 0018:ffff8800bb9bf9c0 EFLAGS: 00010246 [ 29.605013] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 29.612264] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc75f RDI: ffffeafffd408008 [ 29.619508] RBP: ffff8800bb9bf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.626751] R10: 0000000000000001 R11: ffff8800acdd4800 R12: 0000000000000001 [ 29.633992] R13: 1ffff10017737f3e R14: ffff8800af705800 R15: ffffeafffd408000 [ 29.641239] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.649439] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.655294] CR2: ffffeafffd408008 CR3: 00000000bb01c000 CR4: 00000000001606f0 [ 29.662540] Stack: [ 29.664659] ffff8800bb9bfc50 0000000000000001 ffff8800bb9bfa78 ffffffff8150a1f3 [ 29.672689] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef82f [ 29.680671] ffffffff81509ff0 00000000000004f0 ffff8800b09ff2c0 ffff8800bb9bfa40 [ 29.688653] Call Trace: [ 29.691221] [] zap_huge_pmd+0x203/0x510 [ 29.696823] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.703379] [] unmap_single_vma+0xea3/0x1240 [ 29.709412] [] ? vm_normal_page+0x230/0x230 [ 29.715358] [] ? __put_single_page+0x60/0x60 [ 29.721389] [] unmap_vmas+0x81/0xd0 [ 29.726643] [] exit_mmap+0x1c9/0x3a0 [ 29.731981] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.738465] [] ? up_write+0x1a/0x60 [ 29.743722] [] mmput+0xf8/0x2d0 [ 29.748632] [] do_exit+0x8d8/0x26b0 [ 29.753892] [] ? file_map_prot_check+0x193/0x310 [ 29.760272] [] ? release_task.part.17+0x1200/0x1200 [ 29.766915] [] ? SyS_mprotect+0x41e/0x640 [ 29.772686] [] ? up_write+0x1a/0x60 [ 29.777935] [] ? SyS_mprotect+0x423/0x640 [ 29.783707] [] do_group_exit+0x111/0x330 [ 29.789394] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.795862] [] SyS_exit_group+0x1d/0x20 [ 29.801463] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.808014] 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 [ 29.834718] RIP [] page_remove_rmap+0x2e/0x260 [ 29.841066] RSP [ 29.844661] CR2: ffffeafffd408008 [ 29.848095] ---[ end trace 5b37672fac59d00e ]--- [ 29.852820] Kernel panic - not syncing: Fatal exception [ 29.858460] Dumping ftrace buffer: [ 29.861988] (ftrace buffer empty) [ 29.865669] Kernel Offset: disabled [ 29.869270] Rebooting in 86400 seconds..