[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.325379] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.934910] random: sshd: uninitialized urandom read (32 bytes read) [ 21.472940] random: sshd: uninitialized urandom read (32 bytes read) [ 21.979377] random: sshd: uninitialized urandom read (32 bytes read) [ 22.119985] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 27.687091] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.773111] BUG: unable to handle kernel paging request at ffffeafff9018020 [ 27.780525] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.786774] PGD 0 [ 27.788726] [ 27.790348] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.794940] Dumping ftrace buffer: [ 27.798454] (ftrace buffer empty) [ 27.802138] Modules linked in: [ 27.805427] CPU: 0 PID: 3797 Comm: syz-executor462 Not tainted 4.9.120-gf85543b #76 [ 27.813217] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.822554] task: ffff8801b8833000 task.stack: ffff8801d95d8000 [ 27.828589] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.837297] RSP: 0018:ffff8801d95df948 EFLAGS: 00010246 [ 27.842723] RAX: dffffc0000000000 RBX: ffffeafff9018000 RCX: 0000000000000000 [ 27.849974] RDX: 1ffffd5fff203004 RSI: ffffffff814f5128 RDI: ffffeafff9018000 [ 27.857336] RBP: ffff8801d95df970 R08: 0000000000033ee0 R09: 0000000000000001 [ 27.864587] R10: ffff8801b8833000 R11: 0000000000000001 R12: ffff8801d95dfc08 [ 27.871928] R13: ffffeafff9018020 R14: ffffeafff9018000 R15: 0000000000000001 [ 27.879298] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.887512] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.893488] CR2: ffffeafff9018020 CR3: 00000001bc1c9000 CR4: 00000000001606f0 [ 27.900740] Stack: [ 27.902870] ffffeafff9018020 ffff8801d95dfc08 ffff8801cb43f800 ffffeafff9018000 [ 27.910863] ffff8801c8d5a948 ffff8801d95df9c8 ffffffff8154bfcf ffff8801d95dfc18 [ 27.918930] ffff8801d95dfc10 ffff8801d95dfc88 00003ffe406001e0 00000001cb43f000 [ 27.926990] Call Trace: [ 27.929561] [] zap_huge_pmd+0x16f/0x860 [ 27.935162] [] unmap_page_range+0x12ad/0x1730 [ 27.941291] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.947589] [] unmap_single_vma+0x101/0x260 [ 27.953535] [] unmap_vmas+0x102/0x1d0 [ 27.959094] [] exit_mmap+0x214/0x3f0 [ 27.964438] [] ? SyS_munmap+0xa0/0xa0 [ 27.969872] [] ? up_write+0x1a/0x60 [ 27.975142] [] mmput+0xf3/0x2d0 [ 27.980061] [] do_exit+0x906/0x27b0 [ 27.985322] [] ? release_task.part.19+0x1210/0x1210 [ 27.991969] [] ? up_write+0x1a/0x60 [ 27.997363] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.003485] [] ? mprotect_fixup+0x930/0x930 [ 28.009433] [] do_group_exit+0x111/0x340 [ 28.015129] [] ? do_group_exit+0x340/0x340 [ 28.021099] [] SyS_exit_group+0x1d/0x20 [ 28.026698] [] do_syscall_64+0x1a6/0x490 [ 28.032521] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.039418] 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 [ 28.066675] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.073008] RSP [ 28.076606] CR2: ffffeafff9018020 [ 28.080034] ---[ end trace c12209783bb74458 ]--- [ 28.084829] Kernel panic - not syncing: Fatal exception [ 28.090516] Dumping ftrace buffer: [ 28.094038] (ftrace buffer empty) [ 28.097725] Kernel Offset: disabled [ 28.101332] Rebooting in 86400 seconds..