[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.735756] 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: [ 25.268719] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.726988] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.461424] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 26.637507] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 32.197715] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 32.296920] BUG: unable to handle kernel paging request at ffffeafffd320008 [ 32.304316] IP: [] page_remove_rmap+0x2e/0x260 [ 32.310571] PGD 0 [ 32.312858] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.317808] Dumping ftrace buffer: [ 32.321319] (ftrace buffer empty) [ 32.325010] Modules linked in: [ 32.328298] CPU: 1 PID: 3851 Comm: syz-executor321 Not tainted 4.4.150-g5541782 #19 [ 32.336062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.345392] task: ffff8801d909c800 task.stack: ffff8800bb8e0000 [ 32.351419] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.360112] RSP: 0018:ffff8800bb8e7948 EFLAGS: 00010246 [ 32.365533] RAX: dffffc0000000000 RBX: ffffeafffd320000 RCX: 0000000000000000 [ 32.372825] RDX: 1ffffd5fffa64001 RSI: ffffffff814bceaf RDI: ffffeafffd320008 [ 32.380068] RBP: ffff8800bb8e7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.387319] R10: 0000000000000001 R11: ffff8801d909c800 R12: 0000000000000001 [ 32.394565] R13: 1ffff1001771cf2f R14: ffff8800b5b83800 R15: ffffeafffd320000 [ 32.401815] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.410031] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.415885] CR2: ffffeafffd320008 CR3: 00000000b9621000 CR4: 00000000001606f0 [ 32.423128] Stack: [ 32.425248] ffff8800bb8e7bd8 0000000000000001 ffff8800bb8e7a00 ffffffff8150ad13 [ 32.433247] 00003fff4c8001e0 00003fff4c8001e0 0000000041b58ab3 ffffffff841ef837 [ 32.441233] ffffffff8150ab10 00000000000004f0 ffff8800b4897318 ffff8800bb8e79c8 [ 32.449213] Call Trace: [ 32.451785] [] zap_huge_pmd+0x203/0x510 [ 32.457384] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.463938] [] unmap_single_vma+0xea3/0x1240 [ 32.469968] [] ? vm_normal_page+0x280/0x280 [ 32.475919] [] ? __put_single_page+0x60/0x60 [ 32.481948] [] unmap_vmas+0x81/0xd0 [ 32.487204] [] exit_mmap+0x1c9/0x3a0 [ 32.492560] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.499044] [] ? kmem_cache_free+0x2b4/0x340 [ 32.505076] [] mmput+0xf8/0x2d0 [ 32.509977] [] do_exit+0x8d8/0x26b0 [ 32.515239] [] ? file_map_prot_check+0x193/0x310 [ 32.521619] [] ? release_task.part.17+0x1200/0x1200 [ 32.528269] [] ? SyS_mprotect+0x41e/0x640 [ 32.534045] [] ? up_write+0x1a/0x60 [ 32.539299] [] ? SyS_mprotect+0x423/0x640 [ 32.545072] [] do_group_exit+0x111/0x330 [ 32.550757] [] ? do_group_exit+0x330/0x330 [ 32.556615] [] SyS_exit_group+0x1d/0x20 [ 32.562215] [] do_fast_syscall_32+0x324/0x8b0 [ 32.568333] [] sysenter_flags_fixed+0xd/0x1a [ 32.574363] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 32.601184] RIP [] page_remove_rmap+0x2e/0x260 [ 32.607519] RSP [ 32.611115] CR2: ffffeafffd320008 [ 32.614555] ---[ end trace 1bb3fa8d3e0c7947 ]--- [ 32.619289] Kernel panic - not syncing: Fatal exception [ 32.625019] Dumping ftrace buffer: [ 32.628539] (ftrace buffer empty) [ 32.632220] Kernel Offset: disabled [ 32.635817] Rebooting in 86400 seconds..