[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.428691] 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: [ 24.835210] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.264704] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.991541] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 26.174424] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 31.716220] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 31.805996] BUG: unable to handle kernel paging request at ffffeafff8c90008 [ 31.813345] IP: [] page_remove_rmap+0x2e/0x260 [ 31.819589] PGD 0 [ 31.821831] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.826772] Dumping ftrace buffer: [ 31.830289] (ftrace buffer empty) [ 31.833981] Modules linked in: [ 31.837271] CPU: 0 PID: 3834 Comm: syz-executor230 Not tainted 4.4.150-g5541782 #19 [ 31.845038] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.854371] task: ffff8800ac494800 task.stack: ffff8801d2d10000 [ 31.860424] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.869108] RSP: 0018:ffff8801d2d17948 EFLAGS: 00010246 [ 31.874536] RAX: dffffc0000000000 RBX: ffffeafff8c90000 RCX: 0000000000000000 [ 31.881780] RDX: 1ffffd5fff192001 RSI: ffffffff814bceaf RDI: ffffeafff8c90008 [ 31.889023] RBP: ffff8801d2d17958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.896373] R10: 0000000000000001 R11: ffff8800ac494800 R12: 0000000000000001 [ 31.903663] R13: 1ffff1003a5a2f2f R14: ffff8801d18d0800 R15: ffffeafff8c90000 [ 31.910915] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.919114] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.924968] CR2: ffffeafff8c90008 CR3: 00000001d189b000 CR4: 00000000001606f0 [ 31.932260] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.939518] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.946773] Stack: [ 31.948965] ffff8801d2d17bd8 0000000000000001 ffff8801d2d17a00 ffffffff8150ad13 [ 31.957169] 00003ffe324001e0 00003ffe324001e0 0000000041b58ab3 ffffffff841ef837 [ 31.965162] ffffffff8150ab10 00000000000004f0 ffff8801d2397210 ffff8801d2d179c8 [ 31.973209] Call Trace: [ 31.975776] [] zap_huge_pmd+0x203/0x510 [ 31.981379] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.988006] [] unmap_single_vma+0xea3/0x1240 [ 31.994139] [] ? vm_normal_page+0x280/0x280 [ 32.000100] [] ? __put_single_page+0x60/0x60 [ 32.006141] [] unmap_vmas+0x81/0xd0 [ 32.011396] [] exit_mmap+0x1c9/0x3a0 [ 32.016733] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.023318] [] ? up_write+0x1a/0x60 [ 32.028571] [] mmput+0xf8/0x2d0 [ 32.033476] [] do_exit+0x8d8/0x26b0 [ 32.038731] [] ? file_map_prot_check+0x193/0x310 [ 32.045175] [] ? release_task.part.17+0x1200/0x1200 [ 32.051825] [] ? SyS_mprotect+0x41e/0x640 [ 32.057598] [] ? up_write+0x1a/0x60 [ 32.062852] [] ? SyS_mprotect+0x423/0x640 [ 32.068623] [] do_group_exit+0x111/0x330 [ 32.074310] [] ? do_group_exit+0x330/0x330 [ 32.080273] [] SyS_exit_group+0x1d/0x20 [ 32.085879] [] do_fast_syscall_32+0x324/0x8b0 [ 32.092084] [] sysenter_flags_fixed+0xd/0x1a [ 32.098136] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 32.125076] RIP [] page_remove_rmap+0x2e/0x260 [ 32.131430] RSP [ 32.135031] CR2: ffffeafff8c90008 [ 32.138463] ---[ end trace ee9c1f07bdb23211 ]--- [ 32.143194] Kernel panic - not syncing: Fatal exception [ 32.148947] Dumping ftrace buffer: [ 32.152465] (ftrace buffer empty) [ 32.156149] Kernel Offset: disabled [ 32.159748] Rebooting in 86400 seconds..