[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.353725] random: sshd: uninitialized urandom read (32 bytes read, 30 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.611765] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.962769] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 27.607907] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) [ 27.810496] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 33.475960] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 33.568304] BUG: unable to handle kernel paging request at ffffeafffd350008 [ 33.575736] IP: [] page_remove_rmap+0x2e/0x260 [ 33.582191] PGD 0 [ 33.584463] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.589658] Dumping ftrace buffer: [ 33.593356] (ftrace buffer empty) [ 33.597178] Modules linked in: [ 33.600790] CPU: 1 PID: 3796 Comm: syz-executor199 Not tainted 4.4.148-gf057ff9 #81 [ 33.608740] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.618382] task: ffff8801cb3b9800 task.stack: ffff8800bb9f0000 [ 33.624430] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.633735] RSP: 0018:ffff8800bb9f79c0 EFLAGS: 00010246 [ 33.639334] RAX: dffffc0000000000 RBX: ffffeafffd350000 RCX: ffffea0007518000 [ 33.646870] RDX: 1ffffd5fffa6a001 RSI: ffffffff814bc75f RDI: ffffeafffd350008 [ 33.654748] RBP: ffff8800bb9f79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.662008] R10: 0000000000000001 R11: ffff8801cb3b9800 R12: 0000000000000001 [ 33.669422] R13: 1ffff1001773ef3e R14: ffff8800af2c9808 R15: ffffeafffd350000 [ 33.676778] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.685174] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.691220] CR2: ffffeafffd350008 CR3: 00000000b325e000 CR4: 00000000001606f0 [ 33.698490] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.705928] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.713331] Stack: [ 33.715745] ffff8800bb9f7c50 0000000000000001 ffff8800bb9f7a78 ffffffff8150a1f3 [ 33.723881] 00003fff4d4001e0 00003fff4d4001e0 0000000041b58ab3 ffffffff841ef82f [ 33.732019] ffffffff81509ff0 00000000000004f0 ffff8801d2519cb8 ffff8800bb9f7a40 [ 33.740075] Call Trace: [ 33.742655] [] zap_huge_pmd+0x203/0x510 [ 33.748402] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.754978] [] unmap_single_vma+0xea3/0x1240 [ 33.761131] [] ? vm_normal_page+0x230/0x230 [ 33.767525] [] ? __put_single_page+0x60/0x60 [ 33.774079] [] unmap_vmas+0x81/0xd0 [ 33.779504] [] exit_mmap+0x1c9/0x3a0 [ 33.784859] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.791745] [] ? up_write+0x1a/0x60 [ 33.797172] [] mmput+0xf8/0x2d0 [ 33.802267] [] do_exit+0x8d8/0x26b0 [ 33.807540] [] ? file_map_prot_check+0x193/0x310 [ 33.813937] [] ? release_task.part.17+0x1200/0x1200 [ 33.820594] [] ? SyS_mprotect+0x41e/0x640 [ 33.826381] [] ? up_write+0x1a/0x60 [ 33.831647] [] ? SyS_mprotect+0x423/0x640 [ 33.837433] [] do_group_exit+0x111/0x330 [ 33.843246] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.849730] [] SyS_exit_group+0x1d/0x20 [ 33.855342] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.862034] 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 [ 33.890826] RIP [] page_remove_rmap+0x2e/0x260 [ 33.897183] RSP [ 33.900790] CR2: ffffeafffd350008 [ 33.904225] ---[ end trace 7c67dc9da005f523 ]--- [ 33.908957] Kernel panic - not syncing: Fatal exception [ 33.914584] Dumping ftrace buffer: [ 33.918106] (ftrace buffer empty) [ 33.921796] Kernel Offset: disabled [ 33.925401] Rebooting in 86400 seconds..