[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.751055] 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: [ 27.334753] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.588574] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.246815] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 28.426623] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. [ 34.213036] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 34.305411] BUG: unable to handle kernel paging request at ffffeafff8c60008 [ 34.312818] IP: [] page_remove_rmap+0x2e/0x260 [ 34.319078] PGD 0 [ 34.321318] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.326253] Dumping ftrace buffer: [ 34.329761] (ftrace buffer empty) [ 34.333446] Modules linked in: [ 34.336746] CPU: 1 PID: 3823 Comm: syz-executor182 Not tainted 4.4.150-g5541782 #83 [ 34.344615] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.354020] task: ffff8801d9578000 task.stack: ffff8801d9678000 [ 34.360113] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.368796] RSP: 0018:ffff8801d967f9c0 EFLAGS: 00010246 [ 34.374263] RAX: dffffc0000000000 RBX: ffffeafff8c60000 RCX: ffffea0002dc8000 [ 34.381515] RDX: 1ffffd5fff18c001 RSI: ffffffff814bceaf RDI: ffffeafff8c60008 [ 34.388763] RBP: ffff8801d967f9d0 R08: ffffffff85302320 R09: 0000000000000000 [ 34.396052] R10: 0000000000000001 R11: ffff8801d9578000 R12: 0000000000000001 [ 34.403309] R13: 1ffff1003b2cff3e R14: ffff8801cc743800 R15: ffffeafff8c60000 [ 34.410555] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.418757] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.424616] CR2: ffffeafff8c60008 CR3: 00000001cc78a000 CR4: 00000000001606f0 [ 34.431866] Stack: [ 34.433997] ffff8801d967fc50 0000000000000001 ffff8801d967fa78 ffffffff8150ad13 [ 34.442023] 00003ffe318001e0 00003ffe318001e0 0000000041b58ab3 ffffffff841ef837 [ 34.450008] ffffffff8150ab10 00000000000004f0 ffff8801d2cfacb8 ffff8801d967fa40 [ 34.457994] Call Trace: [ 34.460558] [] zap_huge_pmd+0x203/0x510 [ 34.466173] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.472731] [] unmap_single_vma+0xea3/0x1240 [ 34.478770] [] ? vm_normal_page+0x280/0x280 [ 34.484719] [] ? __put_single_page+0x60/0x60 [ 34.490748] [] unmap_vmas+0x81/0xd0 [ 34.496001] [] exit_mmap+0x1c9/0x3a0 [ 34.501342] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.507815] [] ? up_write+0x1a/0x60 [ 34.513077] [] mmput+0xf8/0x2d0 [ 34.517983] [] do_exit+0x8d8/0x26b0 [ 34.523236] [] ? file_map_prot_check+0x193/0x310 [ 34.529617] [] ? release_task.part.17+0x1200/0x1200 [ 34.536263] [] ? SyS_mprotect+0x41e/0x640 [ 34.542035] [] ? up_write+0x1a/0x60 [ 34.547283] [] ? SyS_mprotect+0x423/0x640 [ 34.553055] [] do_group_exit+0x111/0x330 [ 34.558740] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.565208] [] SyS_exit_group+0x1d/0x20 [ 34.570807] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.577442] 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 [ 34.604103] RIP [] page_remove_rmap+0x2e/0x260 [ 34.610424] RSP [ 34.614022] CR2: ffffeafff8c60008 [ 34.617447] ---[ end trace c83dd8a1d8dce2c8 ]--- [ 34.622176] Kernel panic - not syncing: Fatal exception [ 34.627807] Dumping ftrace buffer: [ 34.631323] (ftrace buffer empty) [ 34.635004] Kernel Offset: disabled [ 34.638606] Rebooting in 86400 seconds..