[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.648202] 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: [ 25.408503] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.804475] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.535121] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 39.368349] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 45.172071] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) executing program [ 45.268490] BUG: unable to handle kernel paging request at ffffeafff8ce8008 [ 45.275897] IP: [] page_remove_rmap+0x2e/0x260 [ 45.282156] PGD 0 [ 45.284393] Oops: 0000 [#1] PREEMPT SMP KASAN [ 45.289336] Dumping ftrace buffer: [ 45.292862] (ftrace buffer empty) [ 45.296544] Modules linked in: [ 45.299828] CPU: 0 PID: 3722 Comm: syz-executor287 Not tainted 4.4.149-gf76bdbd #82 [ 45.307590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.316918] task: ffff8800b2afe000 task.stack: ffff8801cd628000 [ 45.322948] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 45.331623] RSP: 0018:ffff8801cd62f9c0 EFLAGS: 00010246 [ 45.337044] RAX: dffffc0000000000 RBX: ffffeafff8ce8000 RCX: 0000000000000000 [ 45.344289] RDX: 1ffffd5fff19d001 RSI: ffffffff814bc8bf RDI: ffffeafff8ce8008 [ 45.351535] RBP: ffff8801cd62f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 45.358790] R10: 0000000000000001 R11: ffff8800b2afe000 R12: 0000000000000001 [ 45.366035] R13: 1ffff10039ac5f3e R14: ffff8801ce06e800 R15: ffffeafff8ce8000 [ 45.373283] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 45.381483] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.387340] CR2: ffffeafff8ce8008 CR3: 00000001d67a2000 CR4: 00000000001606f0 [ 45.394585] Stack: [ 45.396747] ffff8801cd62fc50 0000000000000001 ffff8801cd62fa78 ffffffff8150a443 [ 45.404746] 00003ffe33a001e0 00003ffe33a001e0 0000000041b58ab3 ffffffff841ef837 [ 45.412742] ffffffff8150a240 00000000000004f0 ffff8800b15869a0 ffff8801cd62fa40 [ 45.420734] Call Trace: [ 45.423294] [] zap_huge_pmd+0x203/0x510 [ 45.428894] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 45.435456] [] unmap_single_vma+0xea3/0x1240 [ 45.441485] [] ? vm_normal_page+0x230/0x230 [ 45.447447] [] ? __put_single_page+0x60/0x60 [ 45.453477] [] unmap_vmas+0x81/0xd0 [ 45.458734] [] exit_mmap+0x1c9/0x3a0 [ 45.464074] [] ? SyS_remap_file_pages+0x870/0x870 [ 45.470545] [] ? up_write+0x1a/0x60 [ 45.475808] [] mmput+0xf8/0x2d0 [ 45.480712] [] do_exit+0x8d8/0x26b0 [ 45.485963] [] ? file_map_prot_check+0x193/0x310 [ 45.492445] [] ? release_task.part.17+0x1200/0x1200 [ 45.499092] [] ? SyS_mprotect+0x41e/0x640 [ 45.504866] [] ? up_write+0x1a/0x60 [ 45.510123] [] ? SyS_mprotect+0x423/0x640 [ 45.515896] [] do_group_exit+0x111/0x330 [ 45.521688] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 45.528198] [] SyS_exit_group+0x1d/0x20 [ 45.533809] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 45.540360] 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 [ 45.567636] RIP [] page_remove_rmap+0x2e/0x260 [ 45.573969] RSP [ 45.577567] CR2: ffffeafff8ce8008 [ 45.580996] ---[ end trace 9de4ef93ce0d9662 ]--- [ 45.585724] Kernel panic - not syncing: Fatal exception [ 45.591391] Dumping ftrace buffer: [ 45.594912] (ftrace buffer empty) [ 45.598596] Kernel Offset: disabled [ 45.602195] Rebooting in 86400 seconds..