[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.689809] 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: [ 26.922353] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.232645] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.025249] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) [ 28.200551] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) Warning: Permanently added '10.128.0.6' (ECDSA) to the list of known hosts. [ 33.871654] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) executing program [ 33.958370] BUG: unable to handle kernel paging request at ffffeafff8c58008 [ 33.965760] IP: [] page_remove_rmap+0x2e/0x260 [ 33.972011] PGD 0 [ 33.974253] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.979221] Dumping ftrace buffer: [ 33.982736] (ftrace buffer empty) [ 33.986421] Modules linked in: [ 33.989720] CPU: 0 PID: 3849 Comm: syz-executor211 Not tainted 4.4.148-gf057ff9 #81 [ 33.997485] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.006846] task: ffff8800abc73000 task.stack: ffff8801d95f0000 [ 34.012879] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.021618] RSP: 0018:ffff8801d95f79c0 EFLAGS: 00010246 [ 34.027050] RAX: dffffc0000000000 RBX: ffffeafff8c58000 RCX: 0000000000000000 [ 34.034295] RDX: 1ffffd5fff18b001 RSI: ffffffff814bc75f RDI: ffffeafff8c58008 [ 34.041540] RBP: ffff8801d95f79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.048785] R10: 0000000000000001 R11: ffff8800abc73000 R12: 0000000000000001 [ 34.056031] R13: 1ffff1003b2bef3e R14: ffff8801c90b6800 R15: ffffeafff8c58000 [ 34.063302] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.071501] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.077357] CR2: ffffeafff8c58008 CR3: 00000001ccd69000 CR4: 00000000001606f0 [ 34.084605] Stack: [ 34.086743] ffff8801d95f7c50 0000000000000001 ffff8801d95f7a78 ffffffff8150a1f3 [ 34.094775] 00003ffe316001e0 00003ffe316001e0 0000000041b58ab3 ffffffff841ef82f [ 34.102764] ffffffff81509ff0 00000000000004f0 ffff8801c71ab210 ffff8801d95f7a40 [ 34.110759] Call Trace: [ 34.113337] [] zap_huge_pmd+0x203/0x510 [ 34.118937] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.125491] [] unmap_single_vma+0xea3/0x1240 [ 34.131533] [] ? vm_normal_page+0x230/0x230 [ 34.137479] [] ? __put_single_page+0x60/0x60 [ 34.143516] [] unmap_vmas+0x81/0xd0 [ 34.148787] [] exit_mmap+0x1c9/0x3a0 [ 34.154127] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.160596] [] ? up_write+0x1a/0x60 [ 34.165852] [] mmput+0xf8/0x2d0 [ 34.170755] [] do_exit+0x8d8/0x26b0 [ 34.176009] [] ? file_map_prot_check+0x193/0x310 [ 34.182400] [] ? release_task.part.17+0x1200/0x1200 [ 34.189043] [] ? SyS_mprotect+0x41e/0x640 [ 34.194837] [] ? up_write+0x1a/0x60 [ 34.200090] [] ? SyS_mprotect+0x423/0x640 [ 34.205880] [] do_group_exit+0x111/0x330 [ 34.211566] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.218034] [] SyS_exit_group+0x1d/0x20 [ 34.223652] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.230205] 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 [ 34.257197] RIP [] page_remove_rmap+0x2e/0x260 [ 34.263529] RSP [ 34.267127] CR2: ffffeafff8c58008 [ 34.270579] ---[ end trace cc7494c0a45a7235 ]--- [ 34.275307] Kernel panic - not syncing: Fatal exception [ 34.281054] Dumping ftrace buffer: [ 34.284582] (ftrace buffer empty) [ 34.288267] Kernel Offset: disabled [ 34.291867] Rebooting in 86400 seconds..