[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.628004] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.695552] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.976396] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.710845] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 26.887759] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 32.326512] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) executing program [ 32.417290] BUG: unable to handle kernel paging request at ffffeafff8d40008 [ 32.424647] IP: [] page_remove_rmap+0x2e/0x260 [ 32.430899] PGD 0 [ 32.433137] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.438163] Dumping ftrace buffer: [ 32.441698] (ftrace buffer empty) [ 32.445385] Modules linked in: [ 32.448669] CPU: 1 PID: 3848 Comm: syz-executor117 Not tainted 4.4.148-gf057ff9 #81 [ 32.456434] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.465762] task: ffff8801c6e26000 task.stack: ffff8801d9b48000 [ 32.471788] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.480467] RSP: 0018:ffff8801d9b4f9c0 EFLAGS: 00010246 [ 32.485890] RAX: dffffc0000000000 RBX: ffffeafff8d40000 RCX: 0000000000000000 [ 32.493180] RDX: 1ffffd5fff1a8001 RSI: ffffffff814bc75f RDI: ffffeafff8d40008 [ 32.500430] RBP: ffff8801d9b4f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.507674] R10: 0000000000000001 R11: ffff8801c6e26000 R12: 0000000000000001 [ 32.514918] R13: 1ffff1003b369f3e R14: ffff8801da3b2800 R15: ffffeafff8d40000 [ 32.522213] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.530420] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.536280] CR2: ffffeafff8d40008 CR3: 00000001cea0e000 CR4: 00000000001606f0 [ 32.543528] Stack: [ 32.545652] ffff8801d9b4fc50 0000000000000001 ffff8801d9b4fa78 ffffffff8150a1f3 [ 32.553631] 00003ffe350001e0 00003ffe350001e0 0000000041b58ab3 ffffffff841ef82f [ 32.561711] ffffffff81509ff0 00000000000004f0 ffff8801da3b3160 ffff8801d9b4fa40 [ 32.569718] Call Trace: [ 32.572281] [] zap_huge_pmd+0x203/0x510 [ 32.577886] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.584455] [] unmap_single_vma+0xea3/0x1240 [ 32.590486] [] ? vm_normal_page+0x230/0x230 [ 32.596436] [] ? __put_single_page+0x60/0x60 [ 32.602470] [] unmap_vmas+0x81/0xd0 [ 32.607720] [] exit_mmap+0x1c9/0x3a0 [ 32.613063] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.619548] [] ? up_write+0x1a/0x60 [ 32.624808] [] mmput+0xf8/0x2d0 [ 32.629714] [] do_exit+0x8d8/0x26b0 [ 32.634972] [] ? file_map_prot_check+0x193/0x310 [ 32.641352] [] ? release_task.part.17+0x1200/0x1200 [ 32.648029] [] ? SyS_mprotect+0x41e/0x640 [ 32.653810] [] ? up_write+0x1a/0x60 [ 32.659065] [] ? SyS_mprotect+0x423/0x640 [ 32.664838] [] do_group_exit+0x111/0x330 [ 32.670524] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.676993] [] SyS_exit_group+0x1d/0x20 [ 32.682593] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.689185] 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 [ 32.716252] RIP [] page_remove_rmap+0x2e/0x260 [ 32.722594] RSP [ 32.726227] CR2: ffffeafff8d40008 [ 32.729671] ---[ end trace 6e842d150f1602f9 ]--- [ 32.734401] Kernel panic - not syncing: Fatal exception [ 32.740075] Dumping ftrace buffer: [ 32.743594] (ftrace buffer empty) [ 32.747316] Kernel Offset: disabled [ 32.750931] Rebooting in 86400 seconds..