[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.011839] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.961978] random: sshd: uninitialized urandom read (32 bytes read) [ 20.257619] random: sshd: uninitialized urandom read (32 bytes read) [ 20.837651] random: sshd: uninitialized urandom read (32 bytes read) [ 20.986221] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 26.659733] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.780440] BUG: unable to handle kernel paging request at ffffeafff8e58020 [ 26.788024] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.794333] PGD 0 [ 26.796283] [ 26.797914] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.802448] Dumping ftrace buffer: [ 26.805967] (ftrace buffer empty) [ 26.809656] Modules linked in: [ 26.812947] CPU: 1 PID: 3664 Comm: syz-executor124 Not tainted 4.9.122-g54068d6 #26 [ 26.820758] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.830090] task: ffff8801c417c800 task.stack: ffff8801c3620000 [ 26.836122] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.844802] RSP: 0018:ffff8801c3627948 EFLAGS: 00010246 [ 26.850223] RAX: dffffc0000000000 RBX: ffffeafff8e58000 RCX: 0000000000000000 [ 26.857468] RDX: 1ffffd5fff1cb004 RSI: ffffffff814f5918 RDI: ffffeafff8e58000 [ 26.864718] RBP: ffff8801c3627970 R08: 0000000000034380 R09: 0000000000000001 [ 26.871963] R10: ffff8801c417c800 R11: 0000000000000001 R12: ffff8801c3627c08 [ 26.879209] R13: ffffeafff8e58020 R14: ffffeafff8e58000 R15: 0000000000000001 [ 26.886456] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.894756] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.900739] CR2: ffffeafff8e58020 CR3: 00000001ca829000 CR4: 00000000001606f0 [ 26.908095] Stack: [ 26.910320] ffffeafff8e58020 ffff8801c3627c08 ffff8801c9e0c800 ffffeafff8e58000 [ 26.918447] ffff8801c3a27318 ffff8801c36279c8 ffffffff8154cb8f ffff8801c3627c18 [ 26.926467] ffff8801c3627c10 ffff8801c3627c88 00003ffe396001e0 00000001c9e0c000 [ 26.934488] Call Trace: [ 26.937180] [] zap_huge_pmd+0x16f/0x860 [ 26.942862] [] unmap_page_range+0x12ad/0x1730 [ 26.949027] [] ? vm_normal_page_pmd+0x310/0x310 [ 26.955327] [] unmap_single_vma+0x101/0x260 [ 26.961384] [] unmap_vmas+0x102/0x1d0 [ 26.966812] [] exit_mmap+0x214/0x3f0 [ 26.972275] [] ? SyS_munmap+0xa0/0xa0 [ 26.977703] [] ? up_write+0x1a/0x60 [ 26.982959] [] mmput+0xf3/0x2d0 [ 26.987875] [] do_exit+0x906/0x27b0 [ 26.993212] [] ? release_task.part.19+0x1210/0x1210 [ 26.999864] [] ? up_write+0x1a/0x60 [ 27.005117] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.011329] [] ? mprotect_fixup+0x930/0x930 [ 27.017285] [] do_group_exit+0x111/0x340 [ 27.023034] [] ? do_group_exit+0x340/0x340 [ 27.028920] [] SyS_exit_group+0x1d/0x20 [ 27.034635] [] do_syscall_64+0x1a6/0x490 [ 27.040377] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.047371] 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 [ 27.074621] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.080960] RSP [ 27.084559] CR2: ffffeafff8e58020 [ 27.087994] ---[ end trace a2fcedf7685d8581 ]--- [ 27.092723] Kernel panic - not syncing: Fatal exception [ 27.098316] Dumping ftrace buffer: [ 27.101832] (ftrace buffer empty) [ 27.105523] Kernel Offset: disabled [ 27.109125] Rebooting in 86400 seconds..