[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.523060] 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: [ 28.517889] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.972218] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 29.659846] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 29.848488] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 35.373460] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 35.463849] BUG: unable to handle kernel paging request at ffffeafff8d50008 [ 35.471229] IP: [] page_remove_rmap+0x2e/0x260 [ 35.477512] PGD 0 [ 35.479756] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.484705] Dumping ftrace buffer: [ 35.488230] (ftrace buffer empty) [ 35.491921] Modules linked in: [ 35.495230] CPU: 0 PID: 3771 Comm: syz-executor127 Not tainted 4.4.150-g5541782 #83 [ 35.502999] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.512346] task: ffff8801cb81b000 task.stack: ffff8800afe98000 [ 35.518387] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.527077] RSP: 0018:ffff8800afe9f9c0 EFLAGS: 00010246 [ 35.532502] RAX: dffffc0000000000 RBX: ffffeafff8d50000 RCX: 0000000000000000 [ 35.539750] RDX: 1ffffd5fff1aa001 RSI: ffffffff814bceaf RDI: ffffeafff8d50008 [ 35.546996] RBP: ffff8800afe9f9d0 R08: ffffffff85333170 R09: 0000000000000000 [ 35.554243] R10: 0000000000000001 R11: ffff8801cb81b000 R12: 0000000000000001 [ 35.561490] R13: 1ffff10015fd3f3e R14: ffff8801cb5df800 R15: ffffeafff8d50000 [ 35.568740] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.576942] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.582811] CR2: ffffeafff8d50008 CR3: 00000001cd792000 CR4: 00000000001606f0 [ 35.590074] Stack: [ 35.592198] ffff8800afe9fc50 0000000000000001 ffff8800afe9fa78 ffffffff8150ad13 [ 35.600191] 00003ffe354001e0 00003ffe354001e0 0000000041b58ab3 ffffffff841ef837 [ 35.608244] ffffffff8150ab10 00000000000004f0 ffff8800b5b507e8 ffff8800afe9fa40 [ 35.616247] Call Trace: [ 35.618817] [] zap_huge_pmd+0x203/0x510 [ 35.624425] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.630982] [] unmap_single_vma+0xea3/0x1240 [ 35.637017] [] ? vm_normal_page+0x280/0x280 [ 35.642972] [] ? __put_single_page+0x60/0x60 [ 35.649022] [] unmap_vmas+0x81/0xd0 [ 35.654324] [] exit_mmap+0x1c9/0x3a0 [ 35.659666] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.666135] [] ? up_write+0x1a/0x60 [ 35.671392] [] mmput+0xf8/0x2d0 [ 35.676302] [] do_exit+0x8d8/0x26b0 [ 35.681556] [] ? file_map_prot_check+0x193/0x310 [ 35.687934] [] ? release_task.part.17+0x1200/0x1200 [ 35.694585] [] ? SyS_mprotect+0x41e/0x640 [ 35.700357] [] ? up_write+0x1a/0x60 [ 35.705610] [] ? SyS_mprotect+0x423/0x640 [ 35.711383] [] do_group_exit+0x111/0x330 [ 35.717080] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.723555] [] SyS_exit_group+0x1d/0x20 [ 35.729159] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.735709] 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 [ 35.762833] RIP [] page_remove_rmap+0x2e/0x260 [ 35.769166] RSP [ 35.772774] CR2: ffffeafff8d50008 [ 35.776203] ---[ end trace 052ff4562d68ecc1 ]--- [ 35.780931] Kernel panic - not syncing: Fatal exception [ 35.786568] Dumping ftrace buffer: [ 35.790091] (ftrace buffer empty) [ 35.793775] Kernel Offset: disabled [ 35.797373] Rebooting in 86400 seconds..