[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.675100] 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: [ 24.309277] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.696772] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.329809] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 25.515556] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 31.024189] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 31.113872] BUG: unable to handle kernel paging request at ffffeafffd408008 [ 31.122020] IP: [] page_remove_rmap+0x2e/0x260 [ 31.128265] PGD 0 [ 31.130507] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.135445] Dumping ftrace buffer: [ 31.138960] (ftrace buffer empty) [ 31.142643] Modules linked in: [ 31.145924] CPU: 0 PID: 3743 Comm: syz-executor083 Not tainted 4.4.149-gf76bdbd #82 [ 31.153692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.163028] task: ffff8801cc7c9800 task.stack: ffff8800b1ef0000 [ 31.169058] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.177738] RSP: 0018:ffff8800b1ef79c0 EFLAGS: 00010246 [ 31.183160] RAX: dffffc0000000000 RBX: ffffeafffd408000 RCX: 0000000000000000 [ 31.190480] RDX: 1ffffd5fffa81001 RSI: ffffffff814bc8bf RDI: ffffeafffd408008 [ 31.197731] RBP: ffff8800b1ef79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.205082] R10: 0000000000000001 R11: ffff8801cc7c9800 R12: 0000000000000001 [ 31.212329] R13: 1ffff100163def3e R14: ffff8800b404a800 R15: ffffeafffd408000 [ 31.219581] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.227782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.233637] CR2: ffffeafffd408008 CR3: 00000000b4158000 CR4: 00000000001606f0 [ 31.240885] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.248145] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.255391] Stack: [ 31.257521] ffff8800b1ef7c50 0000000000000001 ffff8800b1ef7a78 ffffffff8150a443 [ 31.265510] 00003fff502001e0 00003fff502001e0 0000000041b58ab3 ffffffff841ef837 [ 31.273492] ffffffff8150a240 00000000000004f0 ffff8801cd696f78 ffff8800b1ef7a40 [ 31.281472] Call Trace: [ 31.284037] [] zap_huge_pmd+0x203/0x510 [ 31.289773] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.296328] [] unmap_single_vma+0xea3/0x1240 [ 31.302368] [] ? vm_normal_page+0x230/0x230 [ 31.308314] [] ? __put_single_page+0x60/0x60 [ 31.314359] [] unmap_vmas+0x81/0xd0 [ 31.319612] [] exit_mmap+0x1c9/0x3a0 [ 31.324947] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.331415] [] ? up_write+0x1a/0x60 [ 31.336668] [] mmput+0xf8/0x2d0 [ 31.341569] [] do_exit+0x8d8/0x26b0 [ 31.346876] [] ? file_map_prot_check+0x193/0x310 [ 31.353262] [] ? release_task.part.17+0x1200/0x1200 [ 31.359903] [] ? SyS_mprotect+0x41e/0x640 [ 31.365676] [] ? up_write+0x1a/0x60 [ 31.370926] [] ? SyS_mprotect+0x423/0x640 [ 31.376697] [] do_group_exit+0x111/0x330 [ 31.382381] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.388844] [] SyS_exit_group+0x1d/0x20 [ 31.394445] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.400990] 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 [ 31.427945] RIP [] page_remove_rmap+0x2e/0x260 [ 31.434278] RSP [ 31.437877] CR2: ffffeafffd408008 [ 31.441308] ---[ end trace 79ac3620043e7ddc ]--- [ 31.446032] Kernel panic - not syncing: Fatal exception [ 31.451797] Dumping ftrace buffer: [ 31.455326] (ftrace buffer empty) [ 31.459015] Kernel Offset: disabled [ 31.462616] Rebooting in 86400 seconds..