[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.048341] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.111863] random: sshd: uninitialized urandom read (32 bytes read) [ 22.554862] random: sshd: uninitialized urandom read (32 bytes read) [ 23.096225] random: sshd: uninitialized urandom read (32 bytes read) [ 23.240491] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 28.770242] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.854239] BUG: unable to handle kernel paging request at ffffeafff90a0020 [ 28.861619] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.867877] PGD 0 [ 28.869823] [ 28.871454] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.875923] Dumping ftrace buffer: [ 28.879436] (ftrace buffer empty) [ 28.883128] Modules linked in: [ 28.886419] CPU: 0 PID: 3785 Comm: syz-executor266 Not tainted 4.9.120-gf85543b #76 [ 28.894251] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.903596] task: ffff8801baf38000 task.stack: ffff8801ba9e0000 [ 28.909628] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.918311] RSP: 0018:ffff8801ba9e7948 EFLAGS: 00010246 [ 28.923735] RAX: dffffc0000000000 RBX: ffffeafff90a0000 RCX: 0000000000000000 [ 28.930987] RDX: 1ffffd5fff214004 RSI: ffffffff814f5128 RDI: ffffeafff90a0000 [ 28.938237] RBP: ffff8801ba9e7970 R08: 00000000000346a0 R09: 0000000000000001 [ 28.945491] R10: ffff8801baf38000 R11: 0000000000000001 R12: ffff8801ba9e7c08 [ 28.952830] R13: ffffeafff90a0020 R14: ffffeafff90a0000 R15: 0000000000000001 [ 28.960161] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.968379] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.974250] CR2: ffffeafff90a0020 CR3: 00000001c17cb000 CR4: 00000000001606f0 [ 28.981551] Stack: [ 28.983687] ffffeafff90a0020 ffff8801ba9e7c08 ffff8801be5f9800 ffffeafff90a0000 [ 28.991684] ffff8801c8f21a50 ffff8801ba9e79c8 ffffffff8154bfcf ffff8801ba9e7c18 [ 28.999684] ffff8801ba9e7c10 ffff8801ba9e7c88 00003ffe428001e0 00000001be5f9000 [ 29.007692] Call Trace: [ 29.010259] [] zap_huge_pmd+0x16f/0x860 [ 29.015940] [] unmap_page_range+0x12ad/0x1730 [ 29.022076] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.028381] [] unmap_single_vma+0x101/0x260 [ 29.034334] [] unmap_vmas+0x102/0x1d0 [ 29.039765] [] exit_mmap+0x214/0x3f0 [ 29.045110] [] ? SyS_munmap+0xa0/0xa0 [ 29.050544] [] ? up_write+0x1a/0x60 [ 29.055944] [] mmput+0xf3/0x2d0 [ 29.060853] [] do_exit+0x906/0x27b0 [ 29.066110] [] ? release_task.part.19+0x1210/0x1210 [ 29.072759] [] ? up_write+0x1a/0x60 [ 29.078014] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.084144] [] ? mprotect_fixup+0x930/0x930 [ 29.090095] [] do_group_exit+0x111/0x340 [ 29.095795] [] ? do_group_exit+0x340/0x340 [ 29.101667] [] SyS_exit_group+0x1d/0x20 [ 29.107285] [] do_syscall_64+0x1a6/0x490 [ 29.112980] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.120029] 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 [ 29.146947] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.153351] RSP [ 29.156956] CR2: ffffeafff90a0020 [ 29.160391] ---[ end trace 8ff191bb20df993c ]--- [ 29.165124] Kernel panic - not syncing: Fatal exception [ 29.170822] Dumping ftrace buffer: [ 29.174344] (ftrace buffer empty) [ 29.178031] Kernel Offset: disabled [ 29.181636] Rebooting in 86400 seconds..