[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.773171] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.600555] random: sshd: uninitialized urandom read (32 bytes read) [ 17.994287] random: sshd: uninitialized urandom read (32 bytes read) [ 18.513861] random: sshd: uninitialized urandom read (32 bytes read) [ 28.652074] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 34.206816] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.288496] BUG: unable to handle kernel paging request at ffffeafff9158020 [ 34.296081] IP: [] page_remove_rmap+0x37/0x6d0 [ 34.302358] PGD 0 [ 34.304312] [ 34.305935] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.310405] Dumping ftrace buffer: [ 34.313932] (ftrace buffer empty) [ 34.317615] Modules linked in: [ 34.321018] CPU: 0 PID: 3803 Comm: syz-executor269 Not tainted 4.9.122-g54068d6 #26 [ 34.328829] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.338224] task: ffff8801b98e3000 task.stack: ffff8801b9790000 [ 34.344273] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 34.352963] RSP: 0018:ffff8801b9797948 EFLAGS: 00010246 [ 34.358387] RAX: dffffc0000000000 RBX: ffffeafff9158000 RCX: 0000000000000000 [ 34.365634] RDX: 1ffffd5fff22b004 RSI: ffffffff814f5918 RDI: ffffeafff9158000 [ 34.372931] RBP: ffff8801b9797970 R08: 0000000000034a40 R09: 0000000000000001 [ 34.380182] R10: ffff8801b98e3000 R11: 0000000000000001 R12: ffff8801b9797c08 [ 34.387525] R13: ffffeafff9158020 R14: ffffeafff9158000 R15: 0000000000000001 [ 34.394820] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.403041] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.408909] CR2: ffffeafff9158020 CR3: 00000001c91dd000 CR4: 00000000001606f0 [ 34.416200] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.423452] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.430697] Stack: [ 34.432931] ffffeafff9158020 ffff8801b9797c08 ffff8801c70e4800 ffffeafff9158000 [ 34.440924] ffff8801c9ed7898 ffff8801b97979c8 ffffffff8154cb8f ffff8801b9797c18 [ 34.448994] ffff8801b9797c10 ffff8801b9797c88 00003ffe456001e0 00000001c70e4000 [ 34.457094] Call Trace: [ 34.459663] [] zap_huge_pmd+0x16f/0x860 [ 34.465269] [] unmap_page_range+0x12ad/0x1730 [ 34.471428] [] ? vm_normal_page_pmd+0x310/0x310 [ 34.477729] [] unmap_single_vma+0x101/0x260 [ 34.483686] [] unmap_vmas+0x102/0x1d0 [ 34.489115] [] exit_mmap+0x214/0x3f0 [ 34.494451] [] ? SyS_munmap+0xa0/0xa0 [ 34.500006] [] ? up_write+0x1a/0x60 [ 34.505258] [] mmput+0xf3/0x2d0 [ 34.510163] [] do_exit+0x906/0x27b0 [ 34.515411] [] ? release_task.part.19+0x1210/0x1210 [ 34.522048] [] ? up_write+0x1a/0x60 [ 34.527302] [] ? do_mprotect_pkey+0x71d/0x890 [ 34.533442] [] ? mprotect_fixup+0x930/0x930 [ 34.539392] [] do_group_exit+0x111/0x340 [ 34.545076] [] ? do_group_exit+0x340/0x340 [ 34.550972] [] SyS_exit_group+0x1d/0x20 [ 34.556571] [] do_syscall_64+0x1a6/0x490 [ 34.562256] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.569150] 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 [ 34.596466] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.602806] RSP [ 34.606402] CR2: ffffeafff9158020 [ 34.609861] ---[ end trace 9481fd0139191079 ]--- [ 34.614590] Kernel panic - not syncing: Fatal exception [ 34.620279] Dumping ftrace buffer: [ 34.623795] (ftrace buffer empty) [ 34.627481] Kernel Offset: disabled [ 34.631088] Rebooting in 86400 seconds..