[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.902412] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.472109] random: sshd: uninitialized urandom read (32 bytes read) [ 20.936414] random: sshd: uninitialized urandom read (32 bytes read) [ 21.443572] random: sshd: uninitialized urandom read (32 bytes read) [ 23.894186] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 29.459508] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.587344] BUG: unable to handle kernel paging request at ffffeafff9038020 [ 29.595158] IP: [] page_remove_rmap+0x37/0x6d0 [ 29.601921] PGD 0 [ 29.604004] [ 29.605650] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.610139] Dumping ftrace buffer: [ 29.613670] (ftrace buffer empty) [ 29.617528] Modules linked in: [ 29.620888] CPU: 1 PID: 3766 Comm: syz-executor142 Not tainted 4.9.122-g54068d6 #78 [ 29.628957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.638321] task: ffff8801bd2c8000 task.stack: ffff8801bd3f8000 [ 29.644634] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.654029] RSP: 0018:ffff8801bd3ff948 EFLAGS: 00010246 [ 29.659643] RAX: dffffc0000000000 RBX: ffffeafff9038000 RCX: 0000000000000000 [ 29.667083] RDX: 1ffffd5fff207004 RSI: ffffffff814f5918 RDI: ffffeafff9038000 [ 29.674486] RBP: ffff8801bd3ff970 R08: 0000000000035060 R09: 0000000000000001 [ 29.682595] R10: ffff8801bd2c8000 R11: 0000000000000001 R12: ffff8801bd3ffc08 [ 29.690362] R13: ffffeafff9038020 R14: ffffeafff9038000 R15: 0000000000000001 [ 29.697635] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.706768] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.712648] CR2: ffffeafff9038020 CR3: 00000001c5afd000 CR4: 00000000001606f0 [ 29.720327] Stack: [ 29.722590] ffffeafff9038020 ffff8801bd3ffc08 ffff8801cb2ea800 ffffeafff9038000 [ 29.731045] ffff8801c3d41210 ffff8801bd3ff9c8 ffffffff8154cb8f ffff8801bd3ffc18 [ 29.739881] ffff8801bd3ffc10 ffff8801bd3ffc88 00003ffe40e001e0 00000001cb2ea000 [ 29.748172] Call Trace: [ 29.751079] [] zap_huge_pmd+0x16f/0x860 [ 29.756705] [] unmap_page_range+0x12ad/0x1730 [ 29.762874] [] ? vm_normal_page_pmd+0x310/0x310 [ 29.770086] [] unmap_single_vma+0x101/0x260 [ 29.776334] [] unmap_vmas+0x102/0x1d0 [ 29.781970] [] exit_mmap+0x214/0x3f0 [ 29.787507] [] ? SyS_munmap+0xa0/0xa0 [ 29.792959] [] ? up_write+0x1a/0x60 [ 29.798556] [] mmput+0xf3/0x2d0 [ 29.803754] [] do_exit+0x906/0x27b0 [ 29.809038] [] ? retint_kernel+0x2d/0x2d [ 29.815313] [] ? release_task.part.19+0x1210/0x1210 [ 29.822422] [] ? check_preemption_disabled+0x3b/0x170 [ 29.829653] [] ? retint_kernel+0x2d/0x2d [ 29.835368] [] ? do_group_exit+0x5a/0x340 [ 29.841511] [] do_group_exit+0x111/0x340 [ 29.847752] [] ? do_group_exit+0x340/0x340 [ 29.853849] [] SyS_exit_group+0x1d/0x20 [ 29.859777] [] do_syscall_64+0x1a6/0x490 [ 29.865652] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.872761] 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 [ 29.903356] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.910108] RSP [ 29.914659] CR2: ffffeafff9038020 [ 29.918398] ---[ end trace da4732a81093a060 ]--- [ 29.923151] Kernel panic - not syncing: Fatal exception [ 29.929385] Dumping ftrace buffer: [ 29.933261] (ftrace buffer empty) [ 29.937080] Kernel Offset: disabled [ 29.940923] Rebooting in 86400 seconds..