[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.903889] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.991358] random: sshd: uninitialized urandom read (32 bytes read) [ 21.477525] random: sshd: uninitialized urandom read (32 bytes read) [ 21.963172] random: sshd: uninitialized urandom read (32 bytes read) [ 47.039462] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 52.665338] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 52.791220] BUG: unable to handle kernel paging request at ffffeafff8fb0020 [ 52.798729] IP: [] page_remove_rmap+0x37/0x6d0 [ 52.804981] PGD 0 [ 52.806927] [ 52.808548] Oops: 0000 [#1] PREEMPT SMP KASAN [ 52.813016] Dumping ftrace buffer: [ 52.816629] (ftrace buffer empty) [ 52.820322] Modules linked in: [ 52.823615] CPU: 1 PID: 3769 Comm: syz-executor407 Not tainted 4.9.122-g54068d6 #78 [ 52.831379] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.840710] task: ffff8801bcdc3000 task.stack: ffff8801cb948000 [ 52.846871] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 52.855560] RSP: 0018:ffff8801cb94f948 EFLAGS: 00010246 [ 52.861081] RAX: dffffc0000000000 RBX: ffffeafff8fb0000 RCX: 0000000000000000 [ 52.868345] RDX: 1ffffd5fff1f6004 RSI: ffffffff814f5918 RDI: ffffeafff8fb0000 [ 52.875607] RBP: ffff8801cb94f970 R08: 0000000000034b60 R09: 0000000000000001 [ 52.882871] R10: ffff8801bcdc3000 R11: 0000000000000001 R12: ffff8801cb94fc08 [ 52.890122] R13: ffffeafff8fb0020 R14: ffffeafff8fb0000 R15: 0000000000000001 [ 52.897379] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 52.905588] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.911454] CR2: ffffeafff8fb0020 CR3: 00000001c84c2000 CR4: 00000000001606f0 [ 52.918777] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.926143] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.933389] Stack: [ 52.935524] ffffeafff8fb0020 ffff8801cb94fc08 ffff8801c8562800 ffffeafff8fb0000 [ 52.943629] ffff8801c7b963c8 ffff8801cb94f9c8 ffffffff8154cb8f ffff8801cb94fc18 [ 52.951627] ffff8801cb94fc10 ffff8801cb94fc88 00003ffe3ec001e0 00000001c8562000 [ 52.959625] Call Trace: [ 52.962216] [] zap_huge_pmd+0x16f/0x860 [ 52.967897] [] unmap_page_range+0x12ad/0x1730 [ 52.974068] [] ? vm_normal_page_pmd+0x310/0x310 [ 52.980474] [] unmap_single_vma+0x101/0x260 [ 52.986426] [] unmap_vmas+0x102/0x1d0 [ 52.991857] [] exit_mmap+0x214/0x3f0 [ 52.997206] [] ? SyS_munmap+0xa0/0xa0 [ 53.002761] [] ? up_write+0x1a/0x60 [ 53.008014] [] mmput+0xf3/0x2d0 [ 53.013019] [] do_exit+0x906/0x27b0 [ 53.018274] [] ? release_task.part.19+0x1210/0x1210 [ 53.025156] [] ? up_write+0x1a/0x60 [ 53.030408] [] ? do_mprotect_pkey+0x71d/0x890 [ 53.036643] [] ? mprotect_fixup+0x930/0x930 [ 53.042714] [] do_group_exit+0x111/0x340 [ 53.048402] [] ? do_group_exit+0x340/0x340 [ 53.054262] [] SyS_exit_group+0x1d/0x20 [ 53.060000] [] do_syscall_64+0x1a6/0x490 [ 53.065707] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 53.072618] 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 [ 53.099608] RIP [] page_remove_rmap+0x37/0x6d0 [ 53.105938] RSP [ 53.109534] CR2: ffffeafff8fb0020 [ 53.112963] ---[ end trace 3669a0de6f24c796 ]--- [ 53.117759] Kernel panic - not syncing: Fatal exception [ 53.123434] Dumping ftrace buffer: [ 53.126952] (ftrace buffer empty) [ 53.130682] Kernel Offset: disabled [ 53.134292] Rebooting in 86400 seconds..