[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.926035] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.363523] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.616589] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.279827] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 35.215722] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 40.940218] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) executing program [ 41.045017] BUG: unable to handle kernel paging request at ffffeafffd420008 [ 41.053086] IP: [] page_remove_rmap+0x2e/0x260 [ 41.059487] PGD 0 [ 41.061763] Oops: 0000 [#1] PREEMPT SMP KASAN [ 41.066936] Dumping ftrace buffer: [ 41.070591] (ftrace buffer empty) [ 41.074313] Modules linked in: [ 41.077634] CPU: 1 PID: 3781 Comm: syz-executor256 Not tainted 4.4.150-g5541782 #19 [ 41.085440] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.094786] task: ffff8801cbac3000 task.stack: ffff8800afa28000 [ 41.101020] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 41.109915] RSP: 0018:ffff8800afa2f948 EFLAGS: 00010246 [ 41.115358] RAX: dffffc0000000000 RBX: ffffeafffd420000 RCX: 0000000000000000 [ 41.122886] RDX: 1ffffd5fffa84001 RSI: ffffffff814bceaf RDI: ffffeafffd420008 [ 41.130454] RBP: ffff8800afa2f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 41.137978] R10: 0000000000000001 R11: ffff8801cbac3000 R12: 0000000000000001 [ 41.145717] R13: 1ffff10015f45f2f R14: ffff8800b3e39800 R15: ffffeafffd420000 [ 41.152983] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 41.161205] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 41.167180] CR2: ffffeafffd420008 CR3: 00000000b4aab000 CR4: 00000000001606f0 [ 41.174627] Stack: [ 41.176767] ffff8800afa2fbd8 0000000000000001 ffff8800afa2fa00 ffffffff8150ad13 [ 41.184833] 00003fff508001e0 00003fff508001e0 0000000041b58ab3 ffffffff841ef837 [ 41.193186] ffffffff8150ab10 00000000000004f0 ffff8800b4bdf268 ffff8800afa2f9c8 [ 41.201272] Call Trace: [ 41.203853] [] zap_huge_pmd+0x203/0x510 [ 41.209709] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 41.216510] [] unmap_single_vma+0xea3/0x1240 [ 41.222563] [] ? vm_normal_page+0x280/0x280 [ 41.228531] [] ? __put_single_page+0x60/0x60 [ 41.234589] [] unmap_vmas+0x81/0xd0 [ 41.239864] [] exit_mmap+0x1c9/0x3a0 [ 41.245257] [] ? SyS_remap_file_pages+0x870/0x870 [ 41.251895] [] ? up_write+0x1a/0x60 [ 41.257168] [] mmput+0xf8/0x2d0 [ 41.262240] [] do_exit+0x8d8/0x26b0 [ 41.267515] [] ? file_map_prot_check+0x193/0x310 [ 41.273915] [] ? release_task.part.17+0x1200/0x1200 [ 41.280609] [] ? retint_kernel+0x2d/0x2d [ 41.286439] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 41.293378] [] ? do_group_exit+0x330/0x330 [ 41.299311] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 41.306091] [] ? retint_kernel+0x2d/0x2d [ 41.311799] [] do_group_exit+0x111/0x330 [ 41.317826] [] ? do_group_exit+0x330/0x330 [ 41.323710] [] SyS_exit_group+0x1d/0x20 [ 41.329342] [] do_fast_syscall_32+0x324/0x8b0 [ 41.335646] [] sysenter_flags_fixed+0xd/0x1a [ 41.341708] 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 [ 41.371034] RIP [] page_remove_rmap+0x2e/0x260 [ 41.377421] RSP [ 41.381041] CR2: ffffeafffd420008 [ 41.385050] ---[ end trace 3f2112a7085181fd ]--- [ 41.389884] Kernel panic - not syncing: Fatal exception [ 41.395970] Dumping ftrace buffer: [ 41.399648] (ftrace buffer empty) [ 41.403490] Kernel Offset: disabled [ 41.407108] Rebooting in 86400 seconds..