[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.094799] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.926982] random: sshd: uninitialized urandom read (32 bytes read) [ 25.352068] random: sshd: uninitialized urandom read (32 bytes read) [ 25.861359] random: sshd: uninitialized urandom read (32 bytes read) [ 25.999388] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 31.496508] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.573296] BUG: unable to handle kernel paging request at ffffeafff8ea0020 [ 31.580756] IP: [] page_remove_rmap+0x37/0x6d0 [ 31.587000] PGD 0 [ 31.588948] [ 31.590570] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.595088] Dumping ftrace buffer: [ 31.598613] (ftrace buffer empty) [ 31.602347] Modules linked in: [ 31.605652] CPU: 0 PID: 3711 Comm: syz-executor985 Not tainted 4.9.121-g681e57b #77 [ 31.613430] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.622760] task: ffff8801c0d73000 task.stack: ffff8801cc240000 [ 31.628790] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 31.637467] RSP: 0018:ffff8801cc247948 EFLAGS: 00010246 [ 31.642952] RAX: dffffc0000000000 RBX: ffffeafff8ea0000 RCX: 0000000000000000 [ 31.650286] RDX: 1ffffd5fff1d4004 RSI: ffffffff814f5278 RDI: ffffeafff8ea0000 [ 31.657537] RBP: ffff8801cc247970 R08: 0000000000033ac0 R09: 0000000000000001 [ 31.664784] R10: ffff8801c0d73000 R11: 0000000000000001 R12: ffff8801cc247c08 [ 31.672033] R13: ffffeafff8ea0020 R14: ffffeafff8ea0000 R15: 0000000000000001 [ 31.679437] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.687746] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.693609] CR2: ffffeafff8ea0020 CR3: 00000001c411c000 CR4: 00000000001606f0 [ 31.700922] Stack: [ 31.703054] ffffeafff8ea0020 ffff8801cc247c08 ffff8801c5a9b800 ffffeafff8ea0000 [ 31.711046] ffff8801c11627e8 ffff8801cc2479c8 ffffffff8154c20f ffff8801cc247c18 [ 31.719122] ffff8801cc247c10 ffff8801cc247c88 00003ffe3a8001e0 00000001c5a9b000 [ 31.727126] Call Trace: [ 31.729694] [] zap_huge_pmd+0x16f/0x860 [ 31.735297] [] unmap_page_range+0x12ad/0x1730 [ 31.741507] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 31.747910] [] unmap_single_vma+0x101/0x260 [ 31.753859] [] unmap_vmas+0x102/0x1d0 [ 31.759298] [] exit_mmap+0x214/0x3f0 [ 31.764698] [] ? SyS_munmap+0xa0/0xa0 [ 31.770133] [] ? up_write+0x1a/0x60 [ 31.775406] [] mmput+0xf3/0x2d0 [ 31.780320] [] do_exit+0x906/0x27b0 [ 31.785575] [] ? release_task.part.19+0x1210/0x1210 [ 31.792238] [] ? up_write+0x1a/0x60 [ 31.797490] [] ? do_mprotect_pkey+0x71d/0x890 [ 31.803689] [] ? mprotect_fixup+0x930/0x930 [ 31.809644] [] do_group_exit+0x111/0x340 [ 31.815333] [] ? do_group_exit+0x340/0x340 [ 31.821192] [] SyS_exit_group+0x1d/0x20 [ 31.826791] [] do_syscall_64+0x1a6/0x490 [ 31.832498] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.839393] 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 [ 31.866211] RIP [] page_remove_rmap+0x37/0x6d0 [ 31.872537] RSP [ 31.876132] CR2: ffffeafff8ea0020 [ 31.879561] ---[ end trace 1a9f0f8d715ceb8f ]--- [ 31.884301] Kernel panic - not syncing: Fatal exception [ 31.889955] Dumping ftrace buffer: [ 31.893478] (ftrace buffer empty) [ 31.897159] Kernel Offset: disabled [ 31.900759] Rebooting in 86400 seconds..