[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.729024] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.298835] random: sshd: uninitialized urandom read (32 bytes read) [ 16.679999] random: sshd: uninitialized urandom read (32 bytes read) [ 17.197388] random: sshd: uninitialized urandom read (32 bytes read) [ 17.331722] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.48' (ECDSA) to the list of known hosts. [ 22.853719] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.939681] BUG: unable to handle kernel paging request at ffffeafff91e8020 [ 22.947037] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.953281] PGD 0 [ 22.955229] [ 22.956848] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.961313] Dumping ftrace buffer: [ 22.964823] (ftrace buffer empty) [ 22.968505] Modules linked in: [ 22.971797] CPU: 0 PID: 3801 Comm: syz-executor724 Not tainted 4.9.122-g54068d6 #26 [ 22.979608] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.988947] task: ffff8801b6bbb000 task.stack: ffff8801b7bf8000 [ 22.994976] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.003654] RSP: 0018:ffff8801b7bff948 EFLAGS: 00010246 [ 23.009086] RAX: dffffc0000000000 RBX: ffffeafff91e8000 RCX: 0000000000000000 [ 23.016443] RDX: 1ffffd5fff23d004 RSI: ffffffff814f5918 RDI: ffffeafff91e8000 [ 23.023687] RBP: ffff8801b7bff970 R08: 00000000000340a0 R09: 0000000000000001 [ 23.030937] R10: ffff8801b6bbb000 R11: 0000000000000001 R12: ffff8801b7bffc08 [ 23.038182] R13: ffffeafff91e8020 R14: ffffeafff91e8000 R15: 0000000000000001 [ 23.045441] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.053647] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.059505] CR2: ffffeafff91e8020 CR3: 00000001bfbaa000 CR4: 00000000001606f0 [ 23.066754] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.074129] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.081421] Stack: [ 23.083554] ffffeafff91e8020 ffff8801b7bffc08 ffff8801c0b6d800 ffffeafff91e8000 [ 23.091544] ffff8801b7876ec8 ffff8801b7bff9c8 ffffffff8154cb8f ffff8801b7bffc18 [ 23.099534] ffff8801b7bffc10 ffff8801b7bffc88 00003ffe47a001e0 00000001c0b6d000 [ 23.107589] Call Trace: [ 23.110162] [] zap_huge_pmd+0x16f/0x860 [ 23.115776] [] unmap_page_range+0x12ad/0x1730 [ 23.121908] [] ? vm_normal_page_pmd+0x310/0x310 [ 23.128210] [] unmap_single_vma+0x101/0x260 [ 23.134157] [] unmap_vmas+0x102/0x1d0 [ 23.139590] [] exit_mmap+0x214/0x3f0 [ 23.144928] [] ? SyS_munmap+0xa0/0xa0 [ 23.150435] [] ? up_write+0x1a/0x60 [ 23.155697] [] mmput+0xf3/0x2d0 [ 23.160621] [] do_exit+0x906/0x27b0 [ 23.165873] [] ? release_task.part.19+0x1210/0x1210 [ 23.172630] [] ? up_write+0x1a/0x60 [ 23.177889] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.184115] [] ? mprotect_fixup+0x930/0x930 [ 23.190103] [] do_group_exit+0x111/0x340 [ 23.195803] [] ? do_group_exit+0x340/0x340 [ 23.201682] [] SyS_exit_group+0x1d/0x20 [ 23.207288] [] do_syscall_64+0x1a6/0x490 [ 23.213045] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.219952] 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 [ 23.247151] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.253488] RSP [ 23.257091] CR2: ffffeafff91e8020 [ 23.260568] ---[ end trace 1b84ed74372f213f ]--- [ 23.265305] Kernel panic - not syncing: Fatal exception [ 23.270974] Dumping ftrace buffer: [ 23.274500] (ftrace buffer empty) [ 23.278187] Kernel Offset: disabled [ 23.281835] Rebooting in 86400 seconds..