[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.825462] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.166394] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 24.544491] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 25.230157] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 25.398299] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 31.120110] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) executing program [ 31.210732] BUG: unable to handle kernel paging request at ffffeafffd350008 [ 31.218127] IP: [] page_remove_rmap+0x2e/0x260 [ 31.224371] PGD 0 [ 31.226622] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.231671] Dumping ftrace buffer: [ 31.235185] (ftrace buffer empty) [ 31.238870] Modules linked in: [ 31.242187] CPU: 1 PID: 3707 Comm: syz-executor278 Not tainted 4.4.150-g5541782 #83 [ 31.249960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.259306] task: ffff8801ce6f8000 task.stack: ffff8800b1cc0000 [ 31.265352] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.274021] RSP: 0018:ffff8800b1cc79c0 EFLAGS: 00010246 [ 31.279442] RAX: dffffc0000000000 RBX: ffffeafffd350000 RCX: 0000000000000000 [ 31.286687] RDX: 1ffffd5fffa6a001 RSI: ffffffff814bceaf RDI: ffffeafffd350008 [ 31.293931] RBP: ffff8800b1cc79d0 R08: ffffffff85333170 R09: 0000000000000000 [ 31.301177] R10: 0000000000000001 R11: ffff8801ce6f8000 R12: 0000000000000001 [ 31.308436] R13: 1ffff10016398f3e R14: ffff8800b2193800 R15: ffffeafffd350000 [ 31.315682] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.323880] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.329741] CR2: ffffeafffd350008 CR3: 00000000b22f2000 CR4: 00000000001606f0 [ 31.336986] Stack: [ 31.339105] ffff8800b1cc7c50 0000000000000001 ffff8800b1cc7a78 ffffffff8150ad13 [ 31.347106] 00003fff4d4001e0 00003fff4d4001e0 0000000041b58ab3 ffffffff841ef837 [ 31.355123] ffffffff8150ab10 00000000000004f0 ffff8800b6fff9a0 ffff8800b1cc7a40 [ 31.363131] Call Trace: [ 31.365696] [] zap_huge_pmd+0x203/0x510 [ 31.371311] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.377866] [] unmap_single_vma+0xea3/0x1240 [ 31.383906] [] ? vm_normal_page+0x280/0x280 [ 31.389856] [] ? __put_single_page+0x60/0x60 [ 31.395909] [] unmap_vmas+0x81/0xd0 [ 31.401165] [] exit_mmap+0x1c9/0x3a0 [ 31.406505] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.412972] [] ? up_write+0x1a/0x60 [ 31.418221] [] mmput+0xf8/0x2d0 [ 31.423124] [] do_exit+0x8d8/0x26b0 [ 31.428378] [] ? file_map_prot_check+0x193/0x310 [ 31.434760] [] ? release_task.part.17+0x1200/0x1200 [ 31.441411] [] ? SyS_mprotect+0x41e/0x640 [ 31.447236] [] ? up_write+0x1a/0x60 [ 31.452522] [] ? SyS_mprotect+0x423/0x640 [ 31.458300] [] do_group_exit+0x111/0x330 [ 31.464006] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.470477] [] SyS_exit_group+0x1d/0x20 [ 31.476089] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.482637] 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 [ 31.509585] RIP [] page_remove_rmap+0x2e/0x260 [ 31.515927] RSP [ 31.519530] CR2: ffffeafffd350008 [ 31.522970] ---[ end trace 2104a2894726f41b ]--- [ 31.527695] Kernel panic - not syncing: Fatal exception [ 31.533370] Dumping ftrace buffer: [ 31.536903] (ftrace buffer empty) [ 31.540589] Kernel Offset: disabled [ 31.544199] Rebooting in 86400 seconds..