[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.377938] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.082665] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.448179] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.075924] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 26.252627] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 31.890073] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 31.977865] BUG: unable to handle kernel paging request at ffffeafffd2c8008 [ 31.985219] IP: [] page_remove_rmap+0x2e/0x260 [ 31.991463] PGD 0 [ 31.993703] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.998652] Dumping ftrace buffer: [ 32.002166] (ftrace buffer empty) [ 32.005850] Modules linked in: [ 32.009138] CPU: 0 PID: 3791 Comm: syz-executor403 Not tainted 4.4.149-gf76bdbd #82 [ 32.016903] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.026232] task: ffff8801caca6000 task.stack: ffff8800bba10000 [ 32.032261] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.040934] RSP: 0018:ffff8800bba179c0 EFLAGS: 00010246 [ 32.046352] RAX: dffffc0000000000 RBX: ffffeafffd2c8000 RCX: 0000000000000000 [ 32.053596] RDX: 1ffffd5fffa59001 RSI: ffffffff814bc8bf RDI: ffffeafffd2c8008 [ 32.060840] RBP: ffff8800bba179d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.068096] R10: 0000000000000001 R11: ffff8801caca6000 R12: 0000000000000001 [ 32.075340] R13: 1ffff10017742f3e R14: ffff8800b6052800 R15: ffffeafffd2c8000 [ 32.082618] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.090821] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.096677] CR2: ffffeafffd2c8008 CR3: 00000000b6797000 CR4: 00000000001606f0 [ 32.103922] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.111163] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.118406] Stack: [ 32.120525] ffff8800bba17c50 0000000000000001 ffff8800bba17a78 ffffffff8150a443 [ 32.128512] 00003fff4b2001e0 00003fff4b2001e0 0000000041b58ab3 ffffffff841ef837 [ 32.136497] ffffffff8150a240 00000000000004f0 ffff8800b33ea580 ffff8800bba17a40 [ 32.144479] Call Trace: [ 32.147038] [] zap_huge_pmd+0x203/0x510 [ 32.152634] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.159184] [] unmap_single_vma+0xea3/0x1240 [ 32.165213] [] ? vm_normal_page+0x230/0x230 [ 32.171155] [] ? __put_single_page+0x60/0x60 [ 32.177184] [] unmap_vmas+0x81/0xd0 [ 32.182432] [] exit_mmap+0x1c9/0x3a0 [ 32.187770] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.194237] [] ? up_write+0x1a/0x60 [ 32.199502] [] mmput+0xf8/0x2d0 [ 32.204405] [] do_exit+0x8d8/0x26b0 [ 32.209655] [] ? file_map_prot_check+0x193/0x310 [ 32.216032] [] ? release_task.part.17+0x1200/0x1200 [ 32.222670] [] ? SyS_mprotect+0x41e/0x640 [ 32.228438] [] ? up_write+0x1a/0x60 [ 32.233686] [] ? SyS_mprotect+0x423/0x640 [ 32.239476] [] do_group_exit+0x111/0x330 [ 32.245179] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.251645] [] SyS_exit_group+0x1d/0x20 [ 32.257243] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.263791] 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 [ 32.290693] RIP [] page_remove_rmap+0x2e/0x260 [ 32.297020] RSP [ 32.300618] CR2: ffffeafffd2c8008 [ 32.304046] ---[ end trace c2df4c9c6916ff98 ]--- [ 32.308771] Kernel panic - not syncing: Fatal exception [ 32.314568] Dumping ftrace buffer: [ 32.318083] (ftrace buffer empty) [ 32.321767] Kernel Offset: disabled [ 32.325363] Rebooting in 86400 seconds..