[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.799975] 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: [ 26.563466] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.841610] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.597468] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 27.777090] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.10.61' (ECDSA) to the list of known hosts. [ 33.338842] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 33.431512] BUG: unable to handle kernel paging request at ffffeafffd3b8008 [ 33.439060] IP: [] page_remove_rmap+0x2e/0x260 [ 33.445304] PGD 0 [ 33.447660] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.452606] Dumping ftrace buffer: [ 33.456122] (ftrace buffer empty) [ 33.459809] Modules linked in: [ 33.463092] CPU: 1 PID: 3818 Comm: syz-executor871 Not tainted 4.4.148-gf057ff9 #81 [ 33.470862] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.480191] task: ffff8801d958e000 task.stack: ffff8800bb260000 [ 33.486339] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.495361] RSP: 0018:ffff8800bb2679c0 EFLAGS: 00010246 [ 33.500783] RAX: dffffc0000000000 RBX: ffffeafffd3b8000 RCX: 0000000000000000 [ 33.508042] RDX: 1ffffd5fffa77001 RSI: ffffffff814bc75f RDI: ffffeafffd3b8008 [ 33.515289] RBP: ffff8800bb2679d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.522541] R10: 0000000000000001 R11: ffff8801d958e000 R12: 0000000000000001 [ 33.529793] R13: 1ffff1001764cf3e R14: ffff8800b491d800 R15: ffffeafffd3b8000 [ 33.537248] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.545450] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.551403] CR2: ffffeafffd3b8008 CR3: 00000000b5eb0000 CR4: 00000000001606f0 [ 33.558654] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.566260] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.573507] Stack: [ 33.575636] ffff8800bb267c50 0000000000000001 ffff8800bb267a78 ffffffff8150a1f3 [ 33.583744] 00003fff4ee001e0 00003fff4ee001e0 0000000041b58ab3 ffffffff841ef82f [ 33.591739] ffffffff81509ff0 00000000000004f0 ffff8800b0c11210 ffff8800bb267a40 [ 33.599726] Call Trace: [ 33.602288] [] zap_huge_pmd+0x203/0x510 [ 33.607923] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.614493] [] unmap_single_vma+0xea3/0x1240 [ 33.620723] [] ? vm_normal_page+0x230/0x230 [ 33.626670] [] ? __put_single_page+0x60/0x60 [ 33.632803] [] unmap_vmas+0x81/0xd0 [ 33.638058] [] exit_mmap+0x1c9/0x3a0 [ 33.643394] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.649859] [] ? up_write+0x1a/0x60 [ 33.655214] [] mmput+0xf8/0x2d0 [ 33.660128] [] do_exit+0x8d8/0x26b0 [ 33.665392] [] ? file_map_prot_check+0x193/0x310 [ 33.671768] [] ? release_task.part.17+0x1200/0x1200 [ 33.678407] [] ? SyS_mprotect+0x41e/0x640 [ 33.684208] [] ? up_write+0x1a/0x60 [ 33.689463] [] ? SyS_mprotect+0x423/0x640 [ 33.695236] [] do_group_exit+0x111/0x330 [ 33.700918] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.707378] [] SyS_exit_group+0x1d/0x20 [ 33.712974] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.719517] 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 [ 33.746552] RIP [] page_remove_rmap+0x2e/0x260 [ 33.752879] RSP [ 33.756583] CR2: ffffeafffd3b8008 [ 33.760011] ---[ end trace a4067c887d2947e1 ]--- [ 33.764734] Kernel panic - not syncing: Fatal exception [ 33.770473] Dumping ftrace buffer: [ 33.773992] (ftrace buffer empty) [ 33.777673] Kernel Offset: disabled [ 33.781272] Rebooting in 86400 seconds..