[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.966987] 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: [ 28.027054] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.506971] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 29.212883] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 29.396877] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 35.092428] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 35.192177] BUG: unable to handle kernel paging request at ffffeafff8cb8008 [ 35.199606] IP: [] page_remove_rmap+0x2e/0x260 [ 35.205864] PGD 0 [ 35.208113] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.213080] Dumping ftrace buffer: [ 35.216594] (ftrace buffer empty) [ 35.220280] Modules linked in: [ 35.223743] CPU: 1 PID: 3839 Comm: syz-executor729 Not tainted 4.4.148-gf057ff9 #81 [ 35.231507] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.240838] task: ffff8800ad69b000 task.stack: ffff8801d9130000 [ 35.246873] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.255659] RSP: 0018:ffff8801d91379c0 EFLAGS: 00010246 [ 35.261092] RAX: dffffc0000000000 RBX: ffffeafff8cb8000 RCX: 0000000000000000 [ 35.268403] RDX: 1ffffd5fff197001 RSI: ffffffff814bc75f RDI: ffffeafff8cb8008 [ 35.275666] RBP: ffff8801d91379d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.282936] R10: 0000000000000001 R11: ffff8800ad69b000 R12: 0000000000000001 [ 35.290187] R13: 1ffff1003b226f3e R14: ffff8801d90f4800 R15: ffffeafff8cb8000 [ 35.297439] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.305644] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.311500] CR2: ffffeafff8cb8008 CR3: 00000001d9785000 CR4: 00000000001606f0 [ 35.318745] Stack: [ 35.320870] ffff8801d9137c50 0000000000000001 ffff8801d9137a78 ffffffff8150a1f3 [ 35.328861] 00003ffe32e001e0 00003ffe32e001e0 0000000041b58ab3 ffffffff841ef82f [ 35.336844] ffffffff81509ff0 00000000000004f0 ffff8801c85d46e0 ffff8801d9137a40 [ 35.344848] Call Trace: [ 35.347411] [] zap_huge_pmd+0x203/0x510 [ 35.353013] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.359571] [] unmap_single_vma+0xea3/0x1240 [ 35.365604] [] ? vm_normal_page+0x230/0x230 [ 35.371552] [] ? __put_single_page+0x60/0x60 [ 35.377583] [] unmap_vmas+0x81/0xd0 [ 35.382838] [] exit_mmap+0x1c9/0x3a0 [ 35.388178] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.394727] [] ? up_write+0x1a/0x60 [ 35.400058] [] mmput+0xf8/0x2d0 [ 35.404993] [] do_exit+0x8d8/0x26b0 [ 35.410262] [] ? file_map_prot_check+0x193/0x310 [ 35.416654] [] ? release_task.part.17+0x1200/0x1200 [ 35.423478] [] ? SyS_mprotect+0x41e/0x640 [ 35.429261] [] ? up_write+0x1a/0x60 [ 35.434521] [] ? SyS_mprotect+0x423/0x640 [ 35.440298] [] do_group_exit+0x111/0x330 [ 35.445986] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.452462] [] SyS_exit_group+0x1d/0x20 [ 35.458075] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.464635] 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 [ 35.491844] RIP [] page_remove_rmap+0x2e/0x260 [ 35.498174] RSP [ 35.501777] CR2: ffffeafff8cb8008 [ 35.505221] ---[ end trace 11eebb264ee58c6a ]--- [ 35.509966] Kernel panic - not syncing: Fatal exception [ 35.515659] Dumping ftrace buffer: [ 35.519183] (ftrace buffer empty) [ 35.522877] Kernel Offset: disabled [ 35.526575] Rebooting in 86400 seconds..