[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.816038] 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: [ 25.514708] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.936551] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.522834] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 26.704659] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 32.358675] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) executing program [ 32.450617] BUG: unable to handle kernel paging request at ffffeafffd2c8008 [ 32.457981] IP: [] page_remove_rmap+0x2e/0x260 [ 32.464231] PGD 0 [ 32.466470] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.471405] Dumping ftrace buffer: [ 32.474916] (ftrace buffer empty) [ 32.478598] Modules linked in: [ 32.481884] CPU: 1 PID: 3803 Comm: syz-executor821 Not tainted 4.4.149-gf76bdbd #82 [ 32.489670] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.499002] task: ffff8801c9cb8000 task.stack: ffff8800aebc8000 [ 32.505076] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.513755] RSP: 0018:ffff8800aebcf9c0 EFLAGS: 00010246 [ 32.519178] RAX: dffffc0000000000 RBX: ffffeafffd2c8000 RCX: 0000000000000000 [ 32.526422] RDX: 1ffffd5fffa59001 RSI: ffffffff814bc8bf RDI: ffffeafffd2c8008 [ 32.533669] RBP: ffff8800aebcf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.540916] R10: 0000000000000001 R11: ffff8801c9cb8000 R12: 0000000000000001 [ 32.548159] R13: 1ffff10015d79f3e R14: ffff8800b3976800 R15: ffffeafffd2c8000 [ 32.555405] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.563606] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.569461] CR2: ffffeafffd2c8008 CR3: 00000000b6a91000 CR4: 00000000001606f0 [ 32.576708] Stack: [ 32.578832] ffff8800aebcfc50 0000000000000001 ffff8800aebcfa78 ffffffff8150a443 [ 32.586819] 00003fff4b2001e0 00003fff4b2001e0 0000000041b58ab3 ffffffff841ef837 [ 32.594807] ffffffff8150a240 00000000000004f0 ffff8801d36fec08 ffff8800aebcfa40 [ 32.602792] Call Trace: [ 32.605354] [] zap_huge_pmd+0x203/0x510 [ 32.610957] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.617512] [] unmap_single_vma+0xea3/0x1240 [ 32.623560] [] ? vm_normal_page+0x230/0x230 [ 32.629507] [] ? __put_single_page+0x60/0x60 [ 32.635537] [] unmap_vmas+0x81/0xd0 [ 32.640799] [] exit_mmap+0x1c9/0x3a0 [ 32.646160] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.652631] [] ? up_write+0x1a/0x60 [ 32.657883] [] mmput+0xf8/0x2d0 [ 32.662790] [] do_exit+0x8d8/0x26b0 [ 32.668041] [] ? file_map_prot_check+0x193/0x310 [ 32.674438] [] ? release_task.part.17+0x1200/0x1200 [ 32.681082] [] ? SyS_mprotect+0x41e/0x640 [ 32.686854] [] ? up_write+0x1a/0x60 [ 32.692128] [] ? SyS_mprotect+0x423/0x640 [ 32.697901] [] do_group_exit+0x111/0x330 [ 32.703588] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.710058] [] SyS_exit_group+0x1d/0x20 [ 32.715659] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.722210] 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 [ 32.749042] RIP [] page_remove_rmap+0x2e/0x260 [ 32.755373] RSP [ 32.759004] CR2: ffffeafffd2c8008 [ 32.762455] ---[ end trace f791ff28e04a6765 ]--- [ 32.767202] Kernel panic - not syncing: Fatal exception [ 32.772852] Dumping ftrace buffer: [ 32.776379] (ftrace buffer empty) [ 32.780063] Kernel Offset: disabled [ 32.783666] Rebooting in 86400 seconds..