[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.048511] 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: [ 24.314741] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.656645] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.436731] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 25.606370] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. [ 31.286482] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 31.377401] BUG: unable to handle kernel paging request at ffffeafffd360008 [ 31.384775] IP: [] page_remove_rmap+0x2e/0x260 [ 31.391018] PGD 0 [ 31.393256] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.398204] Dumping ftrace buffer: [ 31.401737] (ftrace buffer empty) [ 31.405423] Modules linked in: [ 31.408713] CPU: 1 PID: 3831 Comm: syz-executor792 Not tainted 4.4.150-g5541782 #19 [ 31.416494] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.425824] task: ffff8800bb016000 task.stack: ffff8800bb1f8000 [ 31.431856] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.440532] RSP: 0018:ffff8800bb1ff948 EFLAGS: 00010246 [ 31.445954] RAX: dffffc0000000000 RBX: ffffeafffd360000 RCX: 0000000000000000 [ 31.453197] RDX: 1ffffd5fffa6c001 RSI: ffffffff814bceaf RDI: ffffeafffd360008 [ 31.460442] RBP: ffff8800bb1ff958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.467686] R10: 0000000000000001 R11: ffff8800bb016000 R12: 0000000000000001 [ 31.474932] R13: 1ffff1001763ff2f R14: ffff8800b5f0f800 R15: ffffeafffd360000 [ 31.482179] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.490379] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.496239] CR2: ffffeafffd360008 CR3: 00000000ad481000 CR4: 00000000001606f0 [ 31.503486] Stack: [ 31.505607] ffff8800bb1ffbd8 0000000000000001 ffff8800bb1ffa00 ffffffff8150ad13 [ 31.513587] 00003fff4d8001e0 00003fff4d8001e0 0000000041b58ab3 ffffffff841ef837 [ 31.521575] ffffffff8150ab10 00000000000004f0 ffff8801d95d4bb0 ffff8800bb1ff9c8 [ 31.529562] Call Trace: [ 31.532125] [] zap_huge_pmd+0x203/0x510 [ 31.537723] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.544282] [] unmap_single_vma+0xea3/0x1240 [ 31.550316] [] ? vm_normal_page+0x280/0x280 [ 31.556267] [] ? __put_single_page+0x60/0x60 [ 31.562299] [] unmap_vmas+0x81/0xd0 [ 31.567554] [] exit_mmap+0x1c9/0x3a0 [ 31.572899] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.579368] [] ? up_write+0x1a/0x60 [ 31.584624] [] mmput+0xf8/0x2d0 [ 31.589527] [] do_exit+0x8d8/0x26b0 [ 31.594779] [] ? handle_mm_fault+0x19b9/0x3180 [ 31.600985] [] ? release_task.part.17+0x1200/0x1200 [ 31.607632] [] do_group_exit+0x111/0x330 [ 31.613316] [] ? do_group_exit+0x330/0x330 [ 31.619176] [] SyS_exit_group+0x1d/0x20 [ 31.624777] [] do_fast_syscall_32+0x324/0x8b0 [ 31.630900] [] sysenter_flags_fixed+0xd/0x1a [ 31.636930] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 31.663903] RIP [] page_remove_rmap+0x2e/0x260 [ 31.670238] RSP [ 31.673836] CR2: ffffeafffd360008 [ 31.677265] ---[ end trace e4e0eb2ba091b94b ]--- [ 31.681992] Kernel panic - not syncing: Fatal exception [ 31.687630] Dumping ftrace buffer: [ 31.691151] (ftrace buffer empty) [ 31.694833] Kernel Offset: disabled [ 31.698434] Rebooting in 86400 seconds..