[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.908859] 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: [ 24.054055] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 24.495090] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.198389] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 25.379535] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 30.914782] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 31.005723] BUG: unable to handle kernel paging request at ffffeafff8d48008 [ 31.013087] IP: [] page_remove_rmap+0x2e/0x260 [ 31.019331] PGD 0 [ 31.021569] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.026510] Dumping ftrace buffer: [ 31.030030] (ftrace buffer empty) [ 31.033714] Modules linked in: [ 31.036997] CPU: 1 PID: 3833 Comm: syz-executor128 Not tainted 4.4.149-gf76bdbd #82 [ 31.044764] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.054092] task: ffff8801d97c8000 task.stack: ffff8801d9668000 [ 31.060157] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.068835] RSP: 0018:ffff8801d966f9c0 EFLAGS: 00010246 [ 31.074261] RAX: dffffc0000000000 RBX: ffffeafff8d48000 RCX: 0000000000000000 [ 31.081505] RDX: 1ffffd5fff1a9001 RSI: ffffffff814bc8bf RDI: ffffeafff8d48008 [ 31.088752] RBP: ffff8801d966f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.095995] R10: 0000000000000001 R11: ffff8801d97c8000 R12: 0000000000000001 [ 31.103244] R13: 1ffff1003b2cdf3e R14: ffff8801cc648800 R15: ffffeafff8d48000 [ 31.110490] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.118689] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.124546] CR2: ffffeafff8d48008 CR3: 00000001cb706000 CR4: 00000000001606f0 [ 31.131791] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.139033] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.146274] Stack: [ 31.148397] ffff8801d966fc50 0000000000000001 ffff8801d966fa78 ffffffff8150a443 [ 31.156381] 00003ffe352001e0 00003ffe352001e0 0000000041b58ab3 ffffffff841ef837 [ 31.164373] ffffffff8150a240 00000000000004f0 ffff8801cdb621b8 ffff8801d966fa40 [ 31.172362] Call Trace: [ 31.174925] [] zap_huge_pmd+0x203/0x510 [ 31.180523] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.187077] [] unmap_single_vma+0xea3/0x1240 [ 31.193109] [] ? vm_normal_page+0x230/0x230 [ 31.199053] [] ? __put_single_page+0x60/0x60 [ 31.205084] [] unmap_vmas+0x81/0xd0 [ 31.210332] [] exit_mmap+0x1c9/0x3a0 [ 31.215670] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.222139] [] ? up_write+0x1a/0x60 [ 31.227392] [] mmput+0xf8/0x2d0 [ 31.232308] [] do_exit+0x8d8/0x26b0 [ 31.237572] [] ? file_map_prot_check+0x193/0x310 [ 31.243963] [] ? release_task.part.17+0x1200/0x1200 [ 31.250630] [] ? SyS_mprotect+0x41e/0x640 [ 31.256400] [] ? up_write+0x1a/0x60 [ 31.261648] [] ? SyS_mprotect+0x423/0x640 [ 31.267419] [] do_group_exit+0x111/0x330 [ 31.273118] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.279586] [] SyS_exit_group+0x1d/0x20 [ 31.285184] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.291753] 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 [ 31.318718] RIP [] page_remove_rmap+0x2e/0x260 [ 31.325042] RSP [ 31.328637] CR2: ffffeafff8d48008 [ 31.332065] ---[ end trace b664fbb1576db8b2 ]--- [ 31.336791] Kernel panic - not syncing: Fatal exception [ 31.342468] Dumping ftrace buffer: [ 31.345990] (ftrace buffer empty) [ 31.349671] Kernel Offset: disabled [ 31.353272] Rebooting in 86400 seconds..