[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.838409] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.591923] random: sshd: uninitialized urandom read (32 bytes read) [ 29.108602] random: sshd: uninitialized urandom read (32 bytes read) [ 29.474403] random: sshd: uninitialized urandom read (32 bytes read) [ 29.602435] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. [ 35.226963] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 35.312823] BUG: unable to handle kernel paging request at ffffeafff9098020 [ 35.320168] IP: [] page_remove_rmap+0x37/0x6d0 [ 35.326522] PGD 0 [ 35.328469] [ 35.330093] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.334561] Dumping ftrace buffer: [ 35.338075] (ftrace buffer empty) [ 35.341765] Modules linked in: [ 35.345058] CPU: 0 PID: 3801 Comm: syz-executor287 Not tainted 4.9.122-g54068d6 #78 [ 35.352826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.362186] task: ffff8801b709b000 task.stack: ffff8801d94e8000 [ 35.368217] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 35.376898] RSP: 0018:ffff8801d94ef948 EFLAGS: 00010246 [ 35.382331] RAX: dffffc0000000000 RBX: ffffeafff9098000 RCX: 0000000000000000 [ 35.389584] RDX: 1ffffd5fff213004 RSI: ffffffff814f5918 RDI: ffffeafff9098000 [ 35.396827] RBP: ffff8801d94ef970 R08: 00000000000343c0 R09: 0000000000000001 [ 35.404074] R10: ffff8801b709b000 R11: 0000000000000001 R12: ffff8801d94efc08 [ 35.411318] R13: ffffeafff9098020 R14: ffffeafff9098000 R15: 0000000000000001 [ 35.418669] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 35.426875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.432730] CR2: ffffeafff9098020 CR3: 00000001b71d9000 CR4: 00000000001606f0 [ 35.439977] Stack: [ 35.442102] ffffeafff9098020 ffff8801d94efc08 ffff8801b8e87800 ffffeafff9098000 [ 35.450084] ffff8801c8fb6948 ffff8801d94ef9c8 ffffffff8154cb8f ffff8801d94efc18 [ 35.458071] ffff8801d94efc10 ffff8801d94efc88 00003ffe426001e0 00000001b8e87000 [ 35.466067] Call Trace: [ 35.468631] [] zap_huge_pmd+0x16f/0x860 [ 35.474301] [] unmap_page_range+0x12ad/0x1730 [ 35.480428] [] ? vm_normal_page_pmd+0x310/0x310 [ 35.486723] [] unmap_single_vma+0x101/0x260 [ 35.492673] [] unmap_vmas+0x102/0x1d0 [ 35.498109] [] exit_mmap+0x214/0x3f0 [ 35.503459] [] ? SyS_munmap+0xa0/0xa0 [ 35.508885] [] ? up_write+0x1a/0x60 [ 35.514136] [] mmput+0xf3/0x2d0 [ 35.519061] [] do_exit+0x906/0x27b0 [ 35.524312] [] ? release_task.part.19+0x1210/0x1210 [ 35.530960] [] ? up_write+0x1a/0x60 [ 35.536217] [] ? do_mprotect_pkey+0x71d/0x890 [ 35.542351] [] ? mprotect_fixup+0x930/0x930 [ 35.548306] [] do_group_exit+0x111/0x340 [ 35.554099] [] ? do_group_exit+0x340/0x340 [ 35.559965] [] SyS_exit_group+0x1d/0x20 [ 35.565583] [] do_syscall_64+0x1a6/0x490 [ 35.571271] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.578171] 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 [ 35.605275] RIP [] page_remove_rmap+0x37/0x6d0 [ 35.611606] RSP [ 35.615249] CR2: ffffeafff9098020 [ 35.618686] ---[ end trace 657225491303fff5 ]--- [ 35.623417] Kernel panic - not syncing: Fatal exception [ 35.629014] Dumping ftrace buffer: [ 35.632644] (ftrace buffer empty) [ 35.636331] Kernel Offset: disabled [ 35.639940] Rebooting in 86400 seconds..