[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.206456] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.045618] random: sshd: uninitialized urandom read (32 bytes read) [ 20.505525] random: sshd: uninitialized urandom read (32 bytes read) [ 21.068841] random: sshd: uninitialized urandom read (32 bytes read) [ 25.031522] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 30.537772] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.620152] BUG: unable to handle kernel paging request at ffffeafff90e8020 [ 30.627584] IP: [] page_remove_rmap+0x37/0x6d0 [ 30.633852] PGD 0 [ 30.635913] [ 30.637568] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.642158] Dumping ftrace buffer: [ 30.645798] (ftrace buffer empty) [ 30.649496] Modules linked in: [ 30.652789] CPU: 1 PID: 3801 Comm: syz-executor258 Not tainted 4.9.122-g54068d6 #26 [ 30.660565] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.669913] task: ffff8801b89e4800 task.stack: ffff8801b6840000 [ 30.675955] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 30.684694] RSP: 0018:ffff8801b6847948 EFLAGS: 00010246 [ 30.690126] RAX: dffffc0000000000 RBX: ffffeafff90e8000 RCX: 0000000000000000 [ 30.697429] RDX: 1ffffd5fff21d004 RSI: ffffffff814f5918 RDI: ffffeafff90e8000 [ 30.704687] RBP: ffff8801b6847970 R08: 00000000000342c0 R09: 0000000000000001 [ 30.711947] R10: ffff8801b89e4800 R11: 0000000000000001 R12: ffff8801b6847c08 [ 30.719256] R13: ffffeafff90e8020 R14: ffffeafff90e8000 R15: 0000000000000001 [ 30.726528] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.734741] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.740600] CR2: ffffeafff90e8020 CR3: 00000001bbf87000 CR4: 00000000001606f0 [ 30.747852] Stack: [ 30.749997] ffffeafff90e8020 ffff8801b6847c08 ffff8801b83b6800 ffffeafff90e8000 [ 30.758020] ffff8801ca2de7e8 ffff8801b68479c8 ffffffff8154cb8f ffff8801b6847c18 [ 30.766013] ffff8801b6847c10 ffff8801b6847c88 00003ffe43a001e0 00000001b83b6000 [ 30.774019] Call Trace: [ 30.776592] [] zap_huge_pmd+0x16f/0x860 [ 30.782211] [] unmap_page_range+0x12ad/0x1730 [ 30.788341] [] ? vm_normal_page_pmd+0x310/0x310 [ 30.794645] [] unmap_single_vma+0x101/0x260 [ 30.800742] [] unmap_vmas+0x102/0x1d0 [ 30.806177] [] exit_mmap+0x214/0x3f0 [ 30.811527] [] ? SyS_munmap+0xa0/0xa0 [ 30.816985] [] ? up_write+0x1a/0x60 [ 30.822249] [] mmput+0xf3/0x2d0 [ 30.827278] [] do_exit+0x906/0x27b0 [ 30.832638] [] ? release_task.part.19+0x1210/0x1210 [ 30.839286] [] ? up_write+0x1a/0x60 [ 30.844589] [] ? do_mprotect_pkey+0x71d/0x890 [ 30.850718] [] ? mprotect_fixup+0x930/0x930 [ 30.856675] [] do_group_exit+0x111/0x340 [ 30.862425] [] ? do_group_exit+0x340/0x340 [ 30.868293] [] SyS_exit_group+0x1d/0x20 [ 30.874114] [] do_syscall_64+0x1a6/0x490 [ 30.879807] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.886835] Code: 55 41 54 53 48 89 fb e8 58 b4 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 23 b4 e6 [ 30.914037] RIP [] page_remove_rmap+0x37/0x6d0 [ 30.920379] RSP [ 30.923995] CR2: ffffeafff90e8020 [ 30.927427] ---[ end trace b779bcfad46c962c ]--- [ 30.932157] Kernel panic - not syncing: Fatal exception [ 30.937836] Dumping ftrace buffer: [ 30.941427] (ftrace buffer empty) [ 30.945119] Kernel Offset: disabled [ 30.948751] Rebooting in 86400 seconds..