[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.495125] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.831758] random: sshd: uninitialized urandom read (32 bytes read) [ 22.257207] random: sshd: uninitialized urandom read (32 bytes read) [ 22.804613] random: sshd: uninitialized urandom read (32 bytes read) [ 22.946613] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. [ 28.562712] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.647741] BUG: unable to handle kernel paging request at ffffeafff8fb8020 [ 28.655138] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.661438] PGD 0 [ 28.663387] [ 28.665114] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.669652] Dumping ftrace buffer: [ 28.673175] (ftrace buffer empty) [ 28.676872] Modules linked in: [ 28.680166] CPU: 1 PID: 3803 Comm: syz-executor211 Not tainted 4.9.120-gf85543b #24 [ 28.687933] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.697264] task: ffff8801b72a4800 task.stack: ffff8801beac0000 [ 28.703355] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.712042] RSP: 0018:ffff8801beac7948 EFLAGS: 00010246 [ 28.717515] RAX: dffffc0000000000 RBX: ffffeafff8fb8000 RCX: 0000000000000000 [ 28.724767] RDX: 1ffffd5fff1f7004 RSI: ffffffff814f5128 RDI: ffffeafff8fb8000 [ 28.732016] RBP: ffff8801beac7970 R08: 0000000000034160 R09: 0000000000000001 [ 28.739270] R10: ffff8801b72a4800 R11: 0000000000000001 R12: ffff8801beac7c08 [ 28.746525] R13: ffffeafff8fb8020 R14: ffffeafff8fb8000 R15: 0000000000000001 [ 28.753780] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.761985] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.767846] CR2: ffffeafff8fb8020 CR3: 00000001ba2f9000 CR4: 00000000001606f0 [ 28.775096] Stack: [ 28.777225] ffffeafff8fb8020 ffff8801beac7c08 ffff8801bb337800 ffffeafff8fb8000 [ 28.785330] ffff8801ba257210 ffff8801beac79c8 ffffffff8154bfcf ffff8801beac7c18 [ 28.793367] ffff8801beac7c10 ffff8801beac7c88 00003ffe3ee001e0 00000001bb337000 [ 28.801362] Call Trace: [ 28.803930] [] zap_huge_pmd+0x16f/0x860 [ 28.809537] [] unmap_page_range+0x12ad/0x1730 [ 28.815716] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 28.822016] [] unmap_single_vma+0x101/0x260 [ 28.827963] [] unmap_vmas+0x102/0x1d0 [ 28.833387] [] exit_mmap+0x214/0x3f0 [ 28.838725] [] ? SyS_munmap+0xa0/0xa0 [ 28.844158] [] ? up_write+0x1a/0x60 [ 28.849587] [] mmput+0xf3/0x2d0 [ 28.854567] [] do_exit+0x906/0x27b0 [ 28.859846] [] ? release_task.part.19+0x1210/0x1210 [ 28.866492] [] ? up_write+0x1a/0x60 [ 28.871750] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.877881] [] ? mprotect_fixup+0x930/0x930 [ 28.883829] [] do_group_exit+0x111/0x340 [ 28.889517] [] ? do_group_exit+0x340/0x340 [ 28.895379] [] SyS_exit_group+0x1d/0x20 [ 28.900981] [] do_syscall_64+0x1a6/0x490 [ 28.906671] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.913570] 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 [ 28.940663] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.947117] RSP [ 28.950715] CR2: ffffeafff8fb8020 [ 28.954146] ---[ end trace e34094306e6915a9 ]--- [ 28.958878] Kernel panic - not syncing: Fatal exception [ 28.964547] Dumping ftrace buffer: [ 28.968070] (ftrace buffer empty) [ 28.971756] Kernel Offset: disabled [ 28.975358] Rebooting in 86400 seconds..