[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.122398] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.875733] random: sshd: uninitialized urandom read (32 bytes read) [ 17.149106] random: sshd: uninitialized urandom read (32 bytes read) [ 17.634592] random: sshd: uninitialized urandom read (32 bytes read) [ 24.014630] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 29.517209] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.596370] BUG: unable to handle kernel paging request at ffffeafff9148020 [ 29.603854] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.610112] PGD 0 [ 29.612059] [ 29.613680] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.618151] Dumping ftrace buffer: [ 29.621665] (ftrace buffer empty) [ 29.625353] Modules linked in: [ 29.628639] CPU: 1 PID: 3796 Comm: syz-executor145 Not tainted 4.9.122-g54068d6 #78 [ 29.636455] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.645804] task: ffff8801b8661800 task.stack: ffff8801b8360000 [ 29.651837] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.660521] RSP: 0018:ffff8801b8367948 EFLAGS: 00010246 [ 29.665945] RAX: dffffc0000000000 RBX: ffffeafff9148000 RCX: 0000000000000000 [ 29.673195] RDX: 1ffffd5fff229004 RSI: ffffffff814f5918 RDI: ffffeafff9148000 [ 29.680514] RBP: ffff8801b8367970 R08: 00000000000349e0 R09: 0000000000000001 [ 29.687768] R10: ffff8801b8661800 R11: 0000000000000001 R12: ffff8801b8367c08 [ 29.695019] R13: ffffeafff9148020 R14: ffffeafff9148000 R15: 0000000000000001 [ 29.702268] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.710476] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.716340] CR2: ffffeafff9148020 CR3: 00000001c7fe3000 CR4: 00000000001606f0 [ 29.723594] Stack: [ 29.725722] ffffeafff9148020 ffff8801b8367c08 ffff8801c7175800 ffffeafff9148000 [ 29.733711] ffff8801b81493c8 ffff8801b83679c8 ffffffff8154cb8f ffff8801b8367c18 [ 29.741775] ffff8801b8367c10 ffff8801b8367c88 00003ffe452001e0 00000001c7175000 [ 29.749894] Call Trace: [ 29.752466] [] zap_huge_pmd+0x16f/0x860 [ 29.758073] [] unmap_page_range+0x12ad/0x1730 [ 29.764202] [] ? vm_normal_page_pmd+0x310/0x310 [ 29.770504] [] unmap_single_vma+0x101/0x260 [ 29.776516] [] unmap_vmas+0x102/0x1d0 [ 29.781956] [] exit_mmap+0x214/0x3f0 [ 29.787309] [] ? SyS_munmap+0xa0/0xa0 [ 29.792739] [] ? up_write+0x1a/0x60 [ 29.797999] [] mmput+0xf3/0x2d0 [ 29.802914] [] do_exit+0x906/0x27b0 [ 29.808175] [] ? release_task.part.19+0x1210/0x1210 [ 29.814910] [] ? up_write+0x1a/0x60 [ 29.820166] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.826291] [] ? mprotect_fixup+0x930/0x930 [ 29.832253] [] do_group_exit+0x111/0x340 [ 29.837942] [] ? do_group_exit+0x340/0x340 [ 29.843800] [] SyS_exit_group+0x1d/0x20 [ 29.849401] [] do_syscall_64+0x1a6/0x490 [ 29.855086] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.861986] 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 [ 29.889055] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.895396] RSP [ 29.899040] CR2: ffffeafff9148020 [ 29.902480] ---[ end trace 8f4371b117bca50f ]--- [ 29.907215] Kernel panic - not syncing: Fatal exception [ 29.912871] Dumping ftrace buffer: [ 29.916395] (ftrace buffer empty) [ 29.920083] Kernel Offset: disabled [ 29.923686] Rebooting in 86400 seconds..