[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.114768] 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: [ 27.001874] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.372873] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.123848] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) [ 28.304070] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 33.788236] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) executing program [ 33.877858] BUG: unable to handle kernel paging request at ffffeafff8cf0008 [ 33.885210] IP: [] page_remove_rmap+0x2e/0x260 [ 33.891452] PGD 0 [ 33.893688] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.898653] Dumping ftrace buffer: [ 33.902167] (ftrace buffer empty) [ 33.905852] Modules linked in: [ 33.909138] CPU: 0 PID: 3782 Comm: syz-executor966 Not tainted 4.4.148-gf057ff9 #81 [ 33.916902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.926229] task: ffff8800b5eec800 task.stack: ffff8801da358000 [ 33.932256] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.940964] RSP: 0018:ffff8801da35f9c0 EFLAGS: 00010246 [ 33.946385] RAX: dffffc0000000000 RBX: ffffeafff8cf0000 RCX: 0000000000000000 [ 33.953626] RDX: 1ffffd5fff19e001 RSI: ffffffff814bc75f RDI: ffffeafff8cf0008 [ 33.960873] RBP: ffff8801da35f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.968113] R10: 0000000000000001 R11: ffff8800b5eec800 R12: 0000000000000001 [ 33.975357] R13: 1ffff1003b46bf3e R14: ffff8801cf472800 R15: ffffeafff8cf0000 [ 33.982600] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.990797] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.996654] CR2: ffffeafff8cf0008 CR3: 00000001da3df000 CR4: 00000000001606f0 [ 34.003896] Stack: [ 34.006020] ffff8801da35fc50 0000000000000001 ffff8801da35fa78 ffffffff8150a1f3 [ 34.013996] 00003ffe33c001e0 00003ffe33c001e0 0000000041b58ab3 ffffffff841ef82f [ 34.021977] ffffffff81509ff0 00000000000004f0 ffff8801d195a478 ffff8801da35fa40 [ 34.029999] Call Trace: [ 34.032578] [] zap_huge_pmd+0x203/0x510 [ 34.038202] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.044754] [] unmap_single_vma+0xea3/0x1240 [ 34.050784] [] ? vm_normal_page+0x230/0x230 [ 34.056732] [] ? __put_single_page+0x60/0x60 [ 34.062764] [] unmap_vmas+0x81/0xd0 [ 34.068013] [] exit_mmap+0x1c9/0x3a0 [ 34.073348] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.079815] [] ? up_write+0x1a/0x60 [ 34.085092] [] mmput+0xf8/0x2d0 [ 34.089992] [] do_exit+0x8d8/0x26b0 [ 34.095243] [] ? file_map_prot_check+0x193/0x310 [ 34.101624] [] ? release_task.part.17+0x1200/0x1200 [ 34.108275] [] ? SyS_mprotect+0x41e/0x640 [ 34.114053] [] ? up_write+0x1a/0x60 [ 34.119307] [] ? SyS_mprotect+0x423/0x640 [ 34.125082] [] do_group_exit+0x111/0x330 [ 34.130766] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.137255] [] SyS_exit_group+0x1d/0x20 [ 34.142853] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.149418] 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 [ 34.176244] RIP [] page_remove_rmap+0x2e/0x260 [ 34.182569] RSP [ 34.186166] CR2: ffffeafff8cf0008 [ 34.189595] ---[ end trace 48879444fa1fb434 ]--- [ 34.194322] Kernel panic - not syncing: Fatal exception [ 34.199973] Dumping ftrace buffer: [ 34.203490] (ftrace buffer empty) [ 34.207190] Kernel Offset: disabled [ 34.210790] Rebooting in 86400 seconds..