[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.550748] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.694622] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.146520] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 28.841401] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 29.011191] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. [ 34.548665] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 34.636762] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 34.644161] IP: [] page_remove_rmap+0x2e/0x260 [ 34.650421] PGD 0 [ 34.653010] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.658035] Dumping ftrace buffer: [ 34.661551] (ftrace buffer empty) [ 34.665250] Modules linked in: [ 34.668549] CPU: 0 PID: 3847 Comm: syz-executor587 Not tainted 4.4.149-gf76bdbd #18 [ 34.676315] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.685644] task: ffff8800bb0a9800 task.stack: ffff8800bbaf0000 [ 34.691674] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.700359] RSP: 0018:ffff8800bbaf7948 EFLAGS: 00010246 [ 34.705780] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 34.713024] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc8bf RDI: ffffeafffd408008 [ 34.720268] RBP: ffff8800bbaf7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.727510] R10: 0000000000000001 R11: ffff8800bb0a9800 R12: 0000000000000001 [ 34.734770] R13: 1ffff1001775ef2f R14: ffff8800b3b55800 R15: ffffeafffd408000 [ 34.742016] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.750216] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.756074] CR2: ffffeafffd408008 CR3: 00000000b14b5000 CR4: 00000000001606f0 [ 34.763328] Stack: [ 34.765475] ffff8800bbaf7bd8 0000000000000001 ffff8800bbaf7a00 ffffffff8150a443 [ 34.773470] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef837 [ 34.781479] ffffffff8150a240 00000000000004f0 ffff8800acf3db58 ffff8800bbaf79c8 [ 34.789513] Call Trace: [ 34.792082] [] zap_huge_pmd+0x203/0x510 [ 34.797690] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.804257] [] unmap_single_vma+0xea3/0x1240 [ 34.810286] [] ? vm_normal_page+0x230/0x230 [ 34.816243] [] ? __put_single_page+0x60/0x60 [ 34.822273] [] unmap_vmas+0x81/0xd0 [ 34.827523] [] exit_mmap+0x1c9/0x3a0 [ 34.832866] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.839337] [] ? up_write+0x1a/0x60 [ 34.844597] [] mmput+0xf8/0x2d0 [ 34.849513] [] do_exit+0x8d8/0x26b0 [ 34.854766] [] ? file_map_prot_check+0x193/0x310 [ 34.861159] [] ? release_task.part.17+0x1200/0x1200 [ 34.867811] [] ? SyS_mprotect+0x41e/0x640 [ 34.873599] [] ? up_write+0x1a/0x60 [ 34.878853] [] ? SyS_mprotect+0x423/0x640 [ 34.884631] [] do_group_exit+0x111/0x330 [ 34.890330] [] ? do_group_exit+0x330/0x330 [ 34.896189] [] SyS_exit_group+0x1d/0x20 [ 34.901789] [] do_fast_syscall_32+0x324/0x8b0 [ 34.907911] [] sysenter_flags_fixed+0xd/0x1a [ 34.913942] 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 [ 34.941109] RIP [] page_remove_rmap+0x2e/0x260 [ 34.947450] RSP [ 34.951061] CR2: ffffeafffd408008 [ 34.954495] ---[ end trace c5174f26d9fe1499 ]--- [ 34.959223] Kernel panic - not syncing: Fatal exception [ 34.964893] Dumping ftrace buffer: [ 34.968421] (ftrace buffer empty) [ 34.972105] Kernel Offset: disabled [ 34.975703] Rebooting in 86400 seconds..