[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.559124] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.923099] random: sshd: uninitialized urandom read (32 bytes read) [ 30.408217] random: sshd: uninitialized urandom read (32 bytes read) [ 30.923876] random: sshd: uninitialized urandom read (32 bytes read) [ 34.103708] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 39.798181] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 39.886690] BUG: unable to handle kernel paging request at ffffeafff92a0020 [ 39.894083] IP: [] page_remove_rmap+0x37/0x6d0 [ 39.900393] PGD 0 [ 39.902347] [ 39.903976] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.908451] Dumping ftrace buffer: [ 39.912008] (ftrace buffer empty) [ 39.915704] Modules linked in: [ 39.918996] CPU: 0 PID: 3808 Comm: syz-executor177 Not tainted 4.9.121-g681e57b #77 [ 39.926769] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.936114] task: ffff8801b623c800 task.stack: ffff8801b7aa8000 [ 39.942199] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 39.950935] RSP: 0018:ffff8801b7aaf948 EFLAGS: 00010246 [ 39.956371] RAX: dffffc0000000000 RBX: ffffeafff92a0000 RCX: ffffea0006d58000 [ 39.963655] RDX: 1ffffd5fff254004 RSI: ffffffff814f5278 RDI: ffffeafff92a0000 [ 39.970916] RBP: ffff8801b7aaf970 R08: 0000000000034860 R09: 0000000000000001 [ 39.978172] R10: ffff8801b623c800 R11: 0000000000000001 R12: ffff8801b7aafc08 [ 39.985464] R13: ffffeafff92a0020 R14: ffffeafff92a0000 R15: 0000000000000001 [ 39.992848] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 40.001062] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.006933] CR2: ffffeafff92a0020 CR3: 00000001c1882000 CR4: 00000000001606f0 [ 40.014198] Stack: [ 40.016342] ffffeafff92a0020 ffff8801b7aafc08 ffff8801c1973810 ffffeafff92a0000 [ 40.024356] ffff8801c5ce3478 ffff8801b7aaf9c8 ffffffff8154c20f ffff8801b7aafc18 [ 40.032365] ffff8801b7aafc10 ffff8801b7aafc88 00003ffe4a8001a0 00000001c1973000 [ 40.040405] Call Trace: [ 40.042989] [] zap_huge_pmd+0x16f/0x860 [ 40.048616] [] unmap_page_range+0x12ad/0x1730 [ 40.054766] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 40.061086] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 40.068015] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.074847] [] unmap_single_vma+0x101/0x260 [ 40.080811] [] unmap_vmas+0x102/0x1d0 [ 40.086248] [] exit_mmap+0x214/0x3f0 [ 40.091680] [] ? SyS_munmap+0xa0/0xa0 [ 40.097127] [] ? up_write+0x1a/0x60 [ 40.102390] [] mmput+0xf3/0x2d0 [ 40.107305] [] do_exit+0x906/0x27b0 [ 40.112578] [] ? release_task.part.19+0x1210/0x1210 [ 40.119236] [] ? up_write+0x1a/0x60 [ 40.124503] [] ? do_mprotect_pkey+0x71d/0x890 [ 40.130636] [] ? mprotect_fixup+0x930/0x930 [ 40.136600] [] do_group_exit+0x111/0x340 [ 40.142301] [] ? do_group_exit+0x340/0x340 [ 40.148224] [] SyS_exit_group+0x1d/0x20 [ 40.153854] [] do_syscall_64+0x1a6/0x490 [ 40.159559] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.166506] Code: 55 41 54 53 48 89 fb e8 c8 b6 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 93 b6 e6 [ 40.193939] RIP [] page_remove_rmap+0x37/0x6d0 [ 40.200363] RSP [ 40.203976] CR2: ffffeafff92a0020 [ 40.207556] ---[ end trace 4c7df2d4199285d3 ]--- [ 40.212411] Kernel panic - not syncing: Fatal exception [ 40.218149] Dumping ftrace buffer: [ 40.221684] (ftrace buffer empty) [ 40.225379] Kernel Offset: disabled [ 40.228987] Rebooting in 86400 seconds..