[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.150291] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.358831] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.831335] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.543584] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 27.712085] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.10.24' (ECDSA) to the list of known hosts. [ 33.466240] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 33.552583] BUG: unable to handle kernel paging request at ffffeafffd410008 [ 33.559973] IP: [] page_remove_rmap+0x2e/0x260 [ 33.566230] PGD 0 [ 33.568470] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.573430] Dumping ftrace buffer: [ 33.576945] (ftrace buffer empty) [ 33.580632] Modules linked in: [ 33.583919] CPU: 1 PID: 3844 Comm: syz-executor950 Not tainted 4.4.150-g5541782 #19 [ 33.591690] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.601023] task: ffff8800bba3b000 task.stack: ffff8800ac5e0000 [ 33.607053] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.615733] RSP: 0018:ffff8800ac5e7948 EFLAGS: 00010246 [ 33.621158] RAX: dffffc0000000000 RBX: ffffeafffd410000 RCX: 0000000000000000 [ 33.628409] RDX: 1ffffd5fffa82001 RSI: ffffffff814bceaf RDI: ffffeafffd410008 [ 33.635704] RBP: ffff8800ac5e7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.642958] R10: 0000000000000001 R11: ffff8800bba3b000 R12: 0000000000000001 [ 33.650210] R13: 1ffff100158bcf2f R14: ffff8800af59a800 R15: ffffeafffd410000 [ 33.657463] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.665673] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.671564] CR2: ffffeafffd410008 CR3: 00000000b5988000 CR4: 00000000001606f0 [ 33.678823] Stack: [ 33.680949] ffff8800ac5e7bd8 0000000000000001 ffff8800ac5e7a00 ffffffff8150ad13 [ 33.688943] 00003fff504001e0 00003fff504001e0 0000000041b58ab3 ffffffff841ef837 [ 33.696939] ffffffff8150ab10 00000000000004f0 ffff8800bb97e268 ffff8800ac5e79c8 [ 33.704942] Call Trace: [ 33.707514] [] zap_huge_pmd+0x203/0x510 [ 33.713136] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.719696] [] unmap_single_vma+0xea3/0x1240 [ 33.725739] [] ? vm_normal_page+0x280/0x280 [ 33.731688] [] ? __put_single_page+0x60/0x60 [ 33.737720] [] unmap_vmas+0x81/0xd0 [ 33.742978] [] exit_mmap+0x1c9/0x3a0 [ 33.748319] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.754790] [] ? up_write+0x1a/0x60 [ 33.760054] [] mmput+0xf8/0x2d0 [ 33.764987] [] do_exit+0x8d8/0x26b0 [ 33.770245] [] ? file_map_prot_check+0x193/0x310 [ 33.776625] [] ? release_task.part.17+0x1200/0x1200 [ 33.783268] [] ? SyS_mprotect+0x41e/0x640 [ 33.789044] [] ? up_write+0x1a/0x60 [ 33.794299] [] ? SyS_mprotect+0x423/0x640 [ 33.800073] [] do_group_exit+0x111/0x330 [ 33.805759] [] ? do_group_exit+0x330/0x330 [ 33.811620] [] SyS_exit_group+0x1d/0x20 [ 33.817223] [] do_fast_syscall_32+0x324/0x8b0 [ 33.823355] [] sysenter_flags_fixed+0xd/0x1a [ 33.829386] 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 [ 33.856419] RIP [] page_remove_rmap+0x2e/0x260 [ 33.862762] RSP [ 33.866360] CR2: ffffeafffd410008 [ 33.869827] ---[ end trace f7e2b759c6136578 ]--- [ 33.874594] Kernel panic - not syncing: Fatal exception [ 33.880273] Dumping ftrace buffer: [ 33.883796] (ftrace buffer empty) [ 33.887482] Kernel Offset: disabled [ 33.891083] Rebooting in 86400 seconds..