[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.248965] 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: [ 25.999319] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.307690] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.014338] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 27.183475] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 32.711049] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 32.807434] BUG: unable to handle kernel paging request at ffffeafff8da0008 [ 32.814791] IP: [] page_remove_rmap+0x2e/0x260 [ 32.821041] PGD 0 [ 32.823284] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.828249] Dumping ftrace buffer: [ 32.831765] (ftrace buffer empty) [ 32.835454] Modules linked in: [ 32.838747] CPU: 1 PID: 3797 Comm: syz-executor333 Not tainted 4.4.148-gf057ff9 #81 [ 32.846521] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.855861] task: ffff8800bb8b9800 task.stack: ffff8801ca2e0000 [ 32.861898] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.870580] RSP: 0018:ffff8801ca2e79c0 EFLAGS: 00010246 [ 32.876003] RAX: dffffc0000000000 RBX: ffffeafff8da0000 RCX: ffffea0007268000 [ 32.883252] RDX: 1ffffd5fff1b4001 RSI: ffffffff814bc75f RDI: ffffeafff8da0008 [ 32.890495] RBP: ffff8801ca2e79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.897742] R10: 0000000000000001 R11: ffff8800bb8b9800 R12: 0000000000000001 [ 32.904990] R13: 1ffff1003945cf3e R14: ffff8801d0d0b800 R15: ffffeafff8da0000 [ 32.912241] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.920451] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.926319] CR2: ffffeafff8da0008 CR3: 00000001d0d0e000 CR4: 00000000001606f0 [ 32.933564] Stack: [ 32.935726] ffff8801ca2e7c50 0000000000000001 ffff8801ca2e7a78 ffffffff8150a1f3 [ 32.943730] 00003ffe368001e0 00003ffe368001e0 0000000041b58ab3 ffffffff841ef82f [ 32.951711] ffffffff81509ff0 00000000000004f0 ffff8801ca8b89a0 ffff8801ca2e7a40 [ 32.959713] Call Trace: [ 32.962285] [] zap_huge_pmd+0x203/0x510 [ 32.967901] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.974463] [] unmap_single_vma+0xea3/0x1240 [ 32.980505] [] ? vm_normal_page+0x230/0x230 [ 32.986459] [] ? __put_single_page+0x60/0x60 [ 32.992596] [] unmap_vmas+0x81/0xd0 [ 32.997855] [] exit_mmap+0x1c9/0x3a0 [ 33.003207] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.009688] [] ? up_write+0x1a/0x60 [ 33.014947] [] mmput+0xf8/0x2d0 [ 33.019852] [] do_exit+0x8d8/0x26b0 [ 33.025128] [] ? file_map_prot_check+0x193/0x310 [ 33.031521] [] ? release_task.part.17+0x1200/0x1200 [ 33.038171] [] ? SyS_mprotect+0x41e/0x640 [ 33.043952] [] ? up_write+0x1a/0x60 [ 33.049262] [] ? SyS_mprotect+0x423/0x640 [ 33.055048] [] do_group_exit+0x111/0x330 [ 33.060747] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.067278] [] SyS_exit_group+0x1d/0x20 [ 33.072916] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.079514] 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 [ 33.106483] RIP [] page_remove_rmap+0x2e/0x260 [ 33.112825] RSP [ 33.116425] CR2: ffffeafff8da0008 [ 33.119895] ---[ end trace 5f2888d1487afd27 ]--- [ 33.124629] Kernel panic - not syncing: Fatal exception [ 33.130409] Dumping ftrace buffer: [ 33.133934] (ftrace buffer empty) [ 33.137659] Kernel Offset: disabled [ 33.141268] Rebooting in 86400 seconds..