[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.430341] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.839938] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 21.083397] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.746468] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 21.916751] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 27.516554] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 27.602339] BUG: unable to handle kernel paging request at ffffeafffd3c0008 [ 27.609677] IP: [] page_remove_rmap+0x2e/0x260 [ 27.615920] PGD 0 [ 27.618160] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.623102] Dumping ftrace buffer: [ 27.626616] (ftrace buffer empty) [ 27.630298] Modules linked in: [ 27.633585] CPU: 1 PID: 3688 Comm: syz-executor104 Not tainted 4.4.149-gf76bdbd #18 [ 27.641352] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.650680] task: ffff8800b28a0000 task.stack: ffff8800b2cd8000 [ 27.656709] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.665393] RSP: 0018:ffff8800b2cdf948 EFLAGS: 00010246 [ 27.670817] RAX: dffffc0000000000 RBX: ffffeafffd3c0000 RCX: 0000000000000000 [ 27.678173] RDX: 1ffffd5fffa78001 RSI: ffffffff814bc8bf RDI: ffffeafffd3c0008 [ 27.685421] RBP: ffff8800b2cdf958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.692665] R10: 0000000000000001 R11: ffff8800b28a0000 R12: 0000000000000001 [ 27.699911] R13: 1ffff1001659bf2f R14: ffff8800b4b0b800 R15: ffffeafffd3c0000 [ 27.707156] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.715369] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.721242] CR2: ffffeafffd3c0008 CR3: 00000000b42ea000 CR4: 00000000001606f0 [ 27.728489] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.735733] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.742989] Stack: [ 27.745112] ffff8800b2cdfbd8 0000000000000001 ffff8800b2cdfa00 ffffffff8150a443 [ 27.753105] 00003fff4f0001e0 00003fff4f0001e0 0000000041b58ab3 ffffffff841ef837 [ 27.761092] ffffffff8150a240 00000000000004f0 ffff8801d083df78 ffff8800b2cdf9c8 [ 27.769077] Call Trace: [ 27.771643] [] zap_huge_pmd+0x203/0x510 [ 27.777255] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.783809] [] unmap_single_vma+0xea3/0x1240 [ 27.789838] [] ? vm_normal_page+0x230/0x230 [ 27.795822] [] ? __put_single_page+0x60/0x60 [ 27.801891] [] unmap_vmas+0x81/0xd0 [ 27.807159] [] exit_mmap+0x1c9/0x3a0 [ 27.812518] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.818989] [] ? up_write+0x1a/0x60 [ 27.824240] [] mmput+0xf8/0x2d0 [ 27.829143] [] do_exit+0x8d8/0x26b0 [ 27.834396] [] ? file_map_prot_check+0x193/0x310 [ 27.840778] [] ? release_task.part.17+0x1200/0x1200 [ 27.847454] [] ? SyS_mprotect+0x41e/0x640 [ 27.853231] [] ? up_write+0x1a/0x60 [ 27.858485] [] ? SyS_mprotect+0x423/0x640 [ 27.864257] [] do_group_exit+0x111/0x330 [ 27.869940] [] ? do_group_exit+0x330/0x330 [ 27.875796] [] SyS_exit_group+0x1d/0x20 [ 27.881395] [] do_fast_syscall_32+0x324/0x8b0 [ 27.887511] [] sysenter_flags_fixed+0xd/0x1a [ 27.893537] 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 [ 27.920662] RIP [] page_remove_rmap+0x2e/0x260 [ 27.926992] RSP [ 27.930593] CR2: ffffeafffd3c0008 [ 27.934040] ---[ end trace 43db387ab248e1f6 ]--- [ 27.938785] Kernel panic - not syncing: Fatal exception [ 27.944188] Dumping ftrace buffer: [ 27.947701] (ftrace buffer empty) [ 27.951382] Kernel Offset: disabled [ 27.954980] Rebooting in 86400 seconds..