[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.047907] 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: [ 28.058384] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.755913] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 29.547694] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) [ 29.720304] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. [ 35.795073] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) executing program [ 35.884984] BUG: unable to handle kernel paging request at ffffeafffd230008 [ 35.892413] IP: [] page_remove_rmap+0x2e/0x260 [ 35.898683] PGD 0 [ 35.900933] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.905905] Dumping ftrace buffer: [ 35.909933] (ftrace buffer empty) [ 35.913639] Modules linked in: [ 35.916953] CPU: 0 PID: 3762 Comm: syz-executor981 Not tainted 4.4.149-gf76bdbd #82 [ 35.924754] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.934103] task: ffff8800b0ae9800 task.stack: ffff8800b7130000 [ 35.940143] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.948866] RSP: 0018:ffff8800b71379c0 EFLAGS: 00010246 [ 35.954305] RAX: dffffc0000000000 RBX: ffffeafffd230000 RCX: ffffea0002dc8000 [ 35.961561] RDX: 1ffffd5fffa46001 RSI: ffffffff814bc8bf RDI: ffffeafffd230008 [ 35.968814] RBP: ffff8800b71379d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.976081] R10: 0000000000000001 R11: ffff8800b0ae9800 R12: 0000000000000001 [ 35.983337] R13: 1ffff10016e26f3e R14: ffff8800b4b87810 R15: ffffeafffd230000 [ 35.990590] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.998814] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.004678] CR2: ffffeafffd230008 CR3: 00000000b06ff000 CR4: 00000000001606f0 [ 36.011930] Stack: [ 36.014072] ffff8800b7137c50 0000000000000001 ffff8800b7137a78 ffffffff8150a443 [ 36.022106] 00003fff48c001a0 00003fff48c001a0 0000000041b58ab3 ffffffff841ef837 [ 36.030111] ffffffff8150a240 00000000000004f0 ffff8800b3e4c790 ffff8800b7137a40 [ 36.038118] Call Trace: [ 36.040698] [] zap_huge_pmd+0x203/0x510 [ 36.046318] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 36.052881] [] unmap_single_vma+0xea3/0x1240 [ 36.058926] [] ? vm_normal_page+0x230/0x230 [ 36.064899] [] ? __put_single_page+0x60/0x60 [ 36.070946] [] unmap_vmas+0x81/0xd0 [ 36.076228] [] exit_mmap+0x1c9/0x3a0 [ 36.081586] [] ? SyS_remap_file_pages+0x870/0x870 [ 36.088082] [] ? up_write+0x1a/0x60 [ 36.093339] [] mmput+0xf8/0x2d0 [ 36.098254] [] do_exit+0x8d8/0x26b0 [ 36.103507] [] ? file_map_prot_check+0x193/0x310 [ 36.109888] [] ? release_task.part.17+0x1200/0x1200 [ 36.116528] [] ? SyS_mprotect+0x41e/0x640 [ 36.122302] [] ? up_write+0x1a/0x60 [ 36.127554] [] ? SyS_mprotect+0x423/0x640 [ 36.133341] [] do_group_exit+0x111/0x330 [ 36.139031] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 36.145507] [] SyS_exit_group+0x1d/0x20 [ 36.151116] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.157684] 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 [ 36.184679] RIP [] page_remove_rmap+0x2e/0x260 [ 36.191014] RSP [ 36.194630] CR2: ffffeafffd230008 [ 36.198072] ---[ end trace 9be17c73763b6ac2 ]--- [ 36.202828] Kernel panic - not syncing: Fatal exception [ 36.208521] Dumping ftrace buffer: [ 36.212050] (ftrace buffer empty) [ 36.215735] Kernel Offset: disabled [ 36.219338] Rebooting in 86400 seconds..