[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.553761] 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: [ 24.550232] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.952550] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.668483] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 25.846007] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 31.301120] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 31.396477] BUG: unable to handle kernel paging request at ffffeafff8c78008 [ 31.403830] IP: [] page_remove_rmap+0x2e/0x260 [ 31.410079] PGD 0 [ 31.412319] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.417255] Dumping ftrace buffer: [ 31.420766] (ftrace buffer empty) [ 31.424451] Modules linked in: [ 31.427777] CPU: 1 PID: 3798 Comm: syz-executor449 Not tainted 4.4.148-gf057ff9 #81 [ 31.435544] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.444873] task: ffff8800af696000 task.stack: ffff8801c9f78000 [ 31.450901] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.459582] RSP: 0018:ffff8801c9f7f9c0 EFLAGS: 00010246 [ 31.465005] RAX: dffffc0000000000 RBX: ffffeafff8c78000 RCX: ffffea0002dc8000 [ 31.472267] RDX: 1ffffd5fff18f001 RSI: ffffffff814bc75f RDI: ffffeafff8c78008 [ 31.479517] RBP: ffff8801c9f7f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.486774] R10: 0000000000000001 R11: ffff8800af696000 R12: 0000000000000001 [ 31.494021] R13: 1ffff100393eff3e R14: ffff8801cd61c800 R15: ffffeafff8c78000 [ 31.501269] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.509468] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.515340] CR2: ffffeafff8c78008 CR3: 00000001cd758000 CR4: 00000000001606f0 [ 31.522587] Stack: [ 31.524718] ffff8801c9f7fc50 0000000000000001 ffff8801c9f7fa78 ffffffff8150a1f3 [ 31.532706] 00003ffe31e001e0 00003ffe31e001e0 0000000041b58ab3 ffffffff841ef82f [ 31.540690] ffffffff81509ff0 00000000000004f0 ffff8801cd7681b8 ffff8801c9f7fa40 [ 31.548668] Call Trace: [ 31.551240] [] zap_huge_pmd+0x203/0x510 [ 31.556837] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.563389] [] unmap_single_vma+0xea3/0x1240 [ 31.569425] [] ? vm_normal_page+0x230/0x230 [ 31.575374] [] ? __put_single_page+0x60/0x60 [ 31.581430] [] unmap_vmas+0x81/0xd0 [ 31.586681] [] exit_mmap+0x1c9/0x3a0 [ 31.592024] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.598492] [] ? up_write+0x1a/0x60 [ 31.603748] [] mmput+0xf8/0x2d0 [ 31.608649] [] do_exit+0x8d8/0x26b0 [ 31.613902] [] ? file_map_prot_check+0x193/0x310 [ 31.620283] [] ? release_task.part.17+0x1200/0x1200 [ 31.626922] [] ? SyS_mprotect+0x41e/0x640 [ 31.632693] [] ? up_write+0x1a/0x60 [ 31.637944] [] ? SyS_mprotect+0x423/0x640 [ 31.643717] [] do_group_exit+0x111/0x330 [ 31.649410] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.655898] [] SyS_exit_group+0x1d/0x20 [ 31.661500] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.668068] 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 [ 31.694831] RIP [] page_remove_rmap+0x2e/0x260 [ 31.701155] RSP [ 31.704753] CR2: ffffeafff8c78008 [ 31.708182] ---[ end trace 0df795bb8476a7c8 ]--- [ 31.712908] Kernel panic - not syncing: Fatal exception [ 31.718559] Dumping ftrace buffer: [ 31.722080] (ftrace buffer empty) [ 31.725763] Kernel Offset: disabled [ 31.729361] Rebooting in 86400 seconds..