[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.347794] 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: [ 25.854570] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.342640] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.141672] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 27.329589] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 32.972350] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 33.060602] BUG: unable to handle kernel paging request at ffffeafff8cf8008 [ 33.068009] IP: [] page_remove_rmap+0x2e/0x260 [ 33.074299] PGD 0 [ 33.076563] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.081566] Dumping ftrace buffer: [ 33.085139] (ftrace buffer empty) [ 33.088899] Modules linked in: [ 33.092211] CPU: 1 PID: 3717 Comm: syz-executor615 Not tainted 4.4.148-gf057ff9 #81 [ 33.099987] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.109332] task: ffff8800b1a18000 task.stack: ffff8801cd6f0000 [ 33.115421] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.124177] RSP: 0018:ffff8801cd6f79c0 EFLAGS: 00010246 [ 33.129612] RAX: dffffc0000000000 RBX: ffffeafff8cf8000 RCX: 0000000000000000 [ 33.136874] RDX: 1ffffd5fff19f001 RSI: ffffffff814bc75f RDI: ffffeafff8cf8008 [ 33.144139] RBP: ffff8801cd6f79d0 R08: ffffffff85333170 R09: 0000000000000000 [ 33.151409] R10: 0000000000000001 R11: ffff8800b1a18000 R12: 0000000000000001 [ 33.158744] R13: 1ffff10039adef3e R14: ffff8801ce043800 R15: ffffeafff8cf8000 [ 33.166183] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.174395] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.180261] CR2: ffffeafff8cf8008 CR3: 00000001d1022000 CR4: 00000000001606f0 [ 33.187522] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.194780] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.202165] Stack: [ 33.204389] ffff8801cd6f7c50 0000000000000001 ffff8801cd6f7a78 ffffffff8150a1f3 [ 33.212450] 00003ffe33e001e0 00003ffe33e001e0 0000000041b58ab3 ffffffff841ef82f [ 33.220565] ffffffff81509ff0 00000000000004f0 ffff8801cdb961b8 ffff8801cd6f7a40 [ 33.228643] Call Trace: [ 33.231225] [] zap_huge_pmd+0x203/0x510 [ 33.236844] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.243465] [] unmap_single_vma+0xea3/0x1240 [ 33.249511] [] ? vm_normal_page+0x230/0x230 [ 33.255472] [] ? __put_single_page+0x60/0x60 [ 33.261521] [] unmap_vmas+0x81/0xd0 [ 33.266877] [] exit_mmap+0x1c9/0x3a0 [ 33.272230] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.278740] [] ? up_write+0x1a/0x60 [ 33.284014] [] mmput+0xf8/0x2d0 [ 33.288932] [] do_exit+0x8d8/0x26b0 [ 33.294198] [] ? file_map_prot_check+0x193/0x310 [ 33.300591] [] ? release_task.part.17+0x1200/0x1200 [ 33.307307] [] ? SyS_mprotect+0x41e/0x640 [ 33.313094] [] ? up_write+0x1a/0x60 [ 33.318362] [] ? SyS_mprotect+0x423/0x640 [ 33.324147] [] do_group_exit+0x111/0x330 [ 33.329848] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.336329] [] SyS_exit_group+0x1d/0x20 [ 33.341944] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.348505] 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 [ 33.376252] RIP [] page_remove_rmap+0x2e/0x260 [ 33.382611] RSP [ 33.386223] CR2: ffffeafff8cf8008 [ 33.389671] ---[ end trace e68fa7274db75e4e ]--- [ 33.394409] Kernel panic - not syncing: Fatal exception [ 33.399854] Dumping ftrace buffer: [ 33.403386] (ftrace buffer empty) [ 33.407083] Kernel Offset: disabled [ 33.410697] Rebooting in 86400 seconds..