[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.050148] 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: [ 21.748896] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.989021] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 22.574830] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 22.740753] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. [ 28.424420] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) executing program [ 28.516904] BUG: unable to handle kernel paging request at ffffeafff8cb0008 [ 28.524279] IP: [] page_remove_rmap+0x2e/0x260 [ 28.530536] PGD 0 [ 28.532790] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.537960] Dumping ftrace buffer: [ 28.541486] (ftrace buffer empty) [ 28.545179] Modules linked in: [ 28.548483] CPU: 1 PID: 3665 Comm: syz-executor049 Not tainted 4.4.149-gf76bdbd #18 [ 28.556254] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.565895] task: ffff8800b3288000 task.stack: ffff8801cec28000 [ 28.571938] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.580644] RSP: 0018:ffff8801cec2f948 EFLAGS: 00010246 [ 28.586075] RAX: dffffc0000000000 RBX: ffffeafff8cb0000 RCX: 0000000000000000 [ 28.593327] RDX: 1ffffd5fff196001 RSI: ffffffff814bc8bf RDI: ffffeafff8cb0008 [ 28.600578] RBP: ffff8801cec2f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.607837] R10: 0000000000000001 R11: ffff8800b3288000 R12: 0000000000000001 [ 28.615090] R13: 1ffff10039d85f2f R14: ffff8801d7fce800 R15: ffffeafff8cb0000 [ 28.622351] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.630560] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.636422] CR2: ffffeafff8cb0008 CR3: 00000001cf1f7000 CR4: 00000000001606f0 [ 28.643677] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.650925] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.658173] Stack: [ 28.660301] ffff8801cec2fbd8 0000000000000001 ffff8801cec2fa00 ffffffff8150a443 [ 28.668331] 00003ffe32c001e0 00003ffe32c001e0 0000000041b58ab3 ffffffff841ef837 [ 28.676357] ffffffff8150a240 00000000000004f0 ffff8801cf174108 ffff8801cec2f9c8 [ 28.684436] Call Trace: [ 28.687014] [] zap_huge_pmd+0x203/0x510 [ 28.692635] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.699205] [] unmap_single_vma+0xea3/0x1240 [ 28.705246] [] ? vm_normal_page+0x230/0x230 [ 28.711199] [] ? __put_single_page+0x60/0x60 [ 28.717241] [] unmap_vmas+0x81/0xd0 [ 28.722499] [] exit_mmap+0x1c9/0x3a0 [ 28.727925] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.734421] [] ? up_write+0x1a/0x60 [ 28.739692] [] mmput+0xf8/0x2d0 [ 28.744701] [] do_exit+0x8d8/0x26b0 [ 28.750088] [] ? file_map_prot_check+0x193/0x310 [ 28.756485] [] ? release_task.part.17+0x1200/0x1200 [ 28.763269] [] ? SyS_mprotect+0x41e/0x640 [ 28.769059] [] ? up_write+0x1a/0x60 [ 28.774322] [] ? SyS_mprotect+0x423/0x640 [ 28.780103] [] do_group_exit+0x111/0x330 [ 28.785795] [] ? do_group_exit+0x330/0x330 [ 28.791747] [] SyS_exit_group+0x1d/0x20 [ 28.797371] [] do_fast_syscall_32+0x324/0x8b0 [ 28.803506] [] sysenter_flags_fixed+0xd/0x1a [ 28.809554] 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 [ 28.837415] RIP [] page_remove_rmap+0x2e/0x260 [ 28.843763] RSP [ 28.847371] CR2: ffffeafff8cb0008 [ 28.850809] ---[ end trace 4e690151beff6f6d ]--- [ 28.855543] Kernel panic - not syncing: Fatal exception [ 28.861361] Dumping ftrace buffer: [ 28.864971] (ftrace buffer empty) [ 28.868680] Kernel Offset: disabled [ 28.872298] Rebooting in 86400 seconds..