[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.971470] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.644265] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.084683] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.812693] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 26.975436] 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. [ 32.509493] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 32.601388] BUG: unable to handle kernel paging request at ffffeafff8da0008 [ 32.609014] IP: [] page_remove_rmap+0x2e/0x260 [ 32.615277] PGD 0 [ 32.617544] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.622506] Dumping ftrace buffer: [ 32.626035] (ftrace buffer empty) [ 32.629751] Modules linked in: [ 32.633039] CPU: 0 PID: 3817 Comm: syz-executor093 Not tainted 4.4.149-gf76bdbd #82 [ 32.640812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.650141] task: ffff8800ae15c800 task.stack: ffff8801c8fb8000 [ 32.656171] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.664844] RSP: 0018:ffff8801c8fbf9c0 EFLAGS: 00010246 [ 32.670276] RAX: dffffc0000000000 RBX: ffffeafff8da0000 RCX: 0000000000000000 [ 32.677539] RDX: 1ffffd5fff1b4001 RSI: ffffffff814bc8bf RDI: ffffeafff8da0008 [ 32.684783] RBP: ffff8801c8fbf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.692028] R10: 0000000000000001 R11: ffff8800ae15c800 R12: 0000000000000001 [ 32.699272] R13: 1ffff100391f7f3e R14: ffff8801d0381800 R15: ffffeafff8da0000 [ 32.706521] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.714728] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.720582] CR2: ffffeafff8da0008 CR3: 00000001cf289000 CR4: 00000000001606f0 [ 32.727828] Stack: [ 32.729950] ffff8801c8fbfc50 0000000000000001 ffff8801c8fbfa78 ffffffff8150a443 [ 32.737952] 00003ffe368001e0 00003ffe368001e0 0000000041b58ab3 ffffffff841ef837 [ 32.745952] ffffffff8150a240 00000000000004f0 ffff8801cc5aed68 ffff8801c8fbfa40 [ 32.753958] Call Trace: [ 32.756530] [] zap_huge_pmd+0x203/0x510 [ 32.762129] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.768685] [] unmap_single_vma+0xea3/0x1240 [ 32.774716] [] ? vm_normal_page+0x230/0x230 [ 32.780662] [] ? __put_single_page+0x60/0x60 [ 32.786696] [] unmap_vmas+0x81/0xd0 [ 32.791949] [] exit_mmap+0x1c9/0x3a0 [ 32.797285] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.803752] [] ? up_write+0x1a/0x60 [ 32.809002] [] mmput+0xf8/0x2d0 [ 32.813919] [] do_exit+0x8d8/0x26b0 [ 32.819174] [] ? file_map_prot_check+0x193/0x310 [ 32.825555] [] ? release_task.part.17+0x1200/0x1200 [ 32.832198] [] ? SyS_mprotect+0x41e/0x640 [ 32.837969] [] ? up_write+0x1a/0x60 [ 32.843219] [] ? SyS_mprotect+0x423/0x640 [ 32.848990] [] do_group_exit+0x111/0x330 [ 32.854674] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.861142] [] SyS_exit_group+0x1d/0x20 [ 32.866742] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.873291] 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 [ 32.900133] RIP [] page_remove_rmap+0x2e/0x260 [ 32.906460] RSP [ 32.910056] CR2: ffffeafff8da0008 [ 32.913488] ---[ end trace 01a4dc24db3d0391 ]--- [ 32.918225] Kernel panic - not syncing: Fatal exception [ 32.923903] Dumping ftrace buffer: [ 32.927424] (ftrace buffer empty) [ 32.931108] Kernel Offset: disabled [ 32.934709] Rebooting in 86400 seconds..