[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.825363] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.540766] random: sshd: uninitialized urandom read (32 bytes read) [ 18.798060] random: sshd: uninitialized urandom read (32 bytes read) [ 19.286626] random: sshd: uninitialized urandom read (32 bytes read) [ 36.173422] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 41.680023] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 41.761683] BUG: unable to handle kernel paging request at ffffeafff90b0020 [ 41.769241] IP: [] page_remove_rmap+0x37/0x6d0 [ 41.775500] PGD 0 [ 41.777465] [ 41.779096] Oops: 0000 [#1] PREEMPT SMP KASAN [ 41.783563] Dumping ftrace buffer: [ 41.787077] (ftrace buffer empty) [ 41.790765] Modules linked in: [ 41.794059] CPU: 1 PID: 3795 Comm: syz-executor102 Not tainted 4.9.121-g681e57b #77 [ 41.801830] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.811164] task: ffff8801c8529800 task.stack: ffff8801b9770000 [ 41.817196] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 41.826015] RSP: 0018:ffff8801b9777948 EFLAGS: 00010246 [ 41.831483] RAX: dffffc0000000000 RBX: ffffeafff90b0000 RCX: 0000000000000000 [ 41.838741] RDX: 1ffffd5fff216004 RSI: ffffffff814f5278 RDI: ffffeafff90b0000 [ 41.846036] RBP: ffff8801b9777970 R08: 0000000000033920 R09: 0000000000000001 [ 41.853431] R10: ffff8801c8529800 R11: 0000000000000001 R12: ffff8801b9777c08 [ 41.860683] R13: ffffeafff90b0020 R14: ffffeafff90b0000 R15: 0000000000000001 [ 41.867929] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 41.876332] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.882188] CR2: ffffeafff90b0020 CR3: 00000001c0a3b000 CR4: 00000000001606f0 [ 41.889486] Stack: [ 41.891615] ffffeafff90b0020 ffff8801b9777c08 ffff8801bd47d800 ffffeafff90b0000 [ 41.899638] ffff8801bc5ec8f0 ffff8801b97779c8 ffffffff8154c20f ffff8801b9777c18 [ 41.907637] ffff8801b9777c10 ffff8801b9777c88 00003ffe42c001e0 00000001bd47d000 [ 41.915653] Call Trace: [ 41.918220] [] zap_huge_pmd+0x16f/0x860 [ 41.923826] [] unmap_page_range+0x12ad/0x1730 [ 41.929961] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 41.936254] [] unmap_single_vma+0x101/0x260 [ 41.942197] [] unmap_vmas+0x102/0x1d0 [ 41.947625] [] exit_mmap+0x214/0x3f0 [ 41.953077] [] ? SyS_munmap+0xa0/0xa0 [ 41.958506] [] ? up_write+0x1a/0x60 [ 41.963761] [] mmput+0xf3/0x2d0 [ 41.968668] [] do_exit+0x906/0x27b0 [ 41.973923] [] ? release_task.part.19+0x1210/0x1210 [ 41.980785] [] ? up_write+0x1a/0x60 [ 41.986051] [] ? do_mprotect_pkey+0x71d/0x890 [ 41.992175] [] ? mprotect_fixup+0x930/0x930 [ 41.998221] [] do_group_exit+0x111/0x340 [ 42.004025] [] ? do_group_exit+0x340/0x340 [ 42.009899] [] SyS_exit_group+0x1d/0x20 [ 42.015502] [] do_syscall_64+0x1a6/0x490 [ 42.021304] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 42.028215] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 42.055910] RIP [] page_remove_rmap+0x37/0x6d0 [ 42.062291] RSP [ 42.065900] CR2: ffffeafff90b0020 [ 42.069349] ---[ end trace 0db67ddabe0bef1d ]--- [ 42.074078] Kernel panic - not syncing: Fatal exception [ 42.079687] Dumping ftrace buffer: [ 42.083205] (ftrace buffer empty) [ 42.086920] Kernel Offset: disabled [ 42.090528] Rebooting in 86400 seconds..