[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.772528] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.329036] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.845974] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 27.541593] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 27.711674] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 33.373164] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 33.462644] BUG: unable to handle kernel paging request at ffffeafff8d40008 [ 33.470100] IP: [] page_remove_rmap+0x2e/0x260 [ 33.476574] PGD 0 [ 33.478874] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.483825] Dumping ftrace buffer: [ 33.487400] (ftrace buffer empty) [ 33.491099] Modules linked in: [ 33.494383] CPU: 1 PID: 3849 Comm: syz-executor246 Not tainted 4.4.150-g5541782 #83 [ 33.502155] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.511497] task: ffff8801d8e01800 task.stack: ffff8801cd8a8000 [ 33.517537] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.526275] RSP: 0018:ffff8801cd8af9c0 EFLAGS: 00010246 [ 33.531713] RAX: dffffc0000000000 RBX: ffffeafff8d40000 RCX: 0000000000000000 [ 33.539070] RDX: 1ffffd5fff1a8001 RSI: ffffffff814bceaf RDI: ffffeafff8d40008 [ 33.546321] RBP: ffff8801cd8af9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.553572] R10: 0000000000000001 R11: ffff8801d8e01800 R12: 0000000000000001 [ 33.561026] R13: 1ffff10039b15f3e R14: ffff8801c7ac6800 R15: ffffeafff8d40000 [ 33.568319] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.576573] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.582447] CR2: ffffeafff8d40008 CR3: 00000001c7154000 CR4: 00000000001606f0 [ 33.589701] Stack: [ 33.591829] ffff8801cd8afc50 0000000000000001 ffff8801cd8afa78 ffffffff8150ad13 [ 33.599895] 00003ffe350001e0 00003ffe350001e0 0000000041b58ab3 ffffffff841ef837 [ 33.607897] ffffffff8150ab10 00000000000004f0 ffff8801cfee4e18 ffff8801cd8afa40 [ 33.616028] Call Trace: [ 33.618698] [] zap_huge_pmd+0x203/0x510 [ 33.624420] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.630985] [] unmap_single_vma+0xea3/0x1240 [ 33.637107] [] ? vm_normal_page+0x280/0x280 [ 33.643065] [] ? __put_single_page+0x60/0x60 [ 33.649255] [] unmap_vmas+0x81/0xd0 [ 33.654531] [] exit_mmap+0x1c9/0x3a0 [ 33.659878] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.666470] [] ? up_write+0x1a/0x60 [ 33.671749] [] mmput+0xf8/0x2d0 [ 33.676675] [] do_exit+0x8d8/0x26b0 [ 33.682372] [] ? file_map_prot_check+0x193/0x310 [ 33.688763] [] ? release_task.part.17+0x1200/0x1200 [ 33.695409] [] ? SyS_mprotect+0x41e/0x640 [ 33.701184] [] ? up_write+0x1a/0x60 [ 33.706441] [] ? SyS_mprotect+0x423/0x640 [ 33.712216] [] do_group_exit+0x111/0x330 [ 33.717910] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.724385] [] SyS_exit_group+0x1d/0x20 [ 33.729991] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.736697] 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 [ 33.764379] RIP [] page_remove_rmap+0x2e/0x260 [ 33.770734] RSP [ 33.774347] CR2: ffffeafff8d40008 [ 33.777815] ---[ end trace 33a6fcb905f0499e ]--- [ 33.782556] Kernel panic - not syncing: Fatal exception [ 33.788310] Dumping ftrace buffer: [ 33.791899] (ftrace buffer empty) [ 33.795598] Kernel Offset: disabled [ 33.799206] Rebooting in 86400 seconds..