[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.238643] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.949357] random: sshd: uninitialized urandom read (32 bytes read) [ 21.261574] random: sshd: uninitialized urandom read (32 bytes read) [ 21.766680] random: sshd: uninitialized urandom read (32 bytes read) [ 37.368770] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. [ 42.904308] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.986787] BUG: unable to handle kernel paging request at ffffeafff8d78020 [ 42.994193] IP: [] page_remove_rmap+0x37/0x6d0 [ 43.000457] PGD 0 [ 43.002403] [ 43.004026] Oops: 0000 [#1] PREEMPT SMP KASAN [ 43.008498] Dumping ftrace buffer: [ 43.012008] (ftrace buffer empty) [ 43.015693] Modules linked in: [ 43.019125] CPU: 1 PID: 3807 Comm: syz-executor827 Not tainted 4.9.122-g54068d6 #26 [ 43.026902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.036277] task: ffff8801b8afc800 task.stack: ffff8801d97e0000 [ 43.042314] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 43.051022] RSP: 0018:ffff8801d97e7948 EFLAGS: 00010246 [ 43.056447] RAX: dffffc0000000000 RBX: ffffeafff8d78000 RCX: 0000000000000000 [ 43.063696] RDX: 1ffffd5fff1af004 RSI: ffffffff814f5918 RDI: ffffeafff8d78000 [ 43.070942] RBP: ffff8801d97e7970 R08: 0000000000034120 R09: 0000000000000001 [ 43.078188] R10: ffff8801b8afc800 R11: 0000000000000001 R12: ffff8801d97e7c08 [ 43.085535] R13: ffffeafff8d78020 R14: ffffeafff8d78000 R15: 0000000000000001 [ 43.092787] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 43.100992] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.106851] CR2: ffffeafff8d78020 CR3: 00000001bf3bd000 CR4: 00000000001606f0 [ 43.114306] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.121560] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.128807] Stack: [ 43.130975] ffffeafff8d78020 ffff8801d97e7c08 ffff8801c7fa5800 ffffeafff8d78000 [ 43.138990] ffff8801b7ee3a50 ffff8801d97e79c8 ffffffff8154cb8f ffff8801d97e7c18 [ 43.147122] ffff8801d97e7c10 ffff8801d97e7c88 00003ffe35e001e0 00000001c7fa5000 [ 43.155126] Call Trace: [ 43.157701] [] zap_huge_pmd+0x16f/0x860 [ 43.163302] [] unmap_page_range+0x12ad/0x1730 [ 43.169422] [] ? vm_normal_page_pmd+0x310/0x310 [ 43.175718] [] unmap_single_vma+0x101/0x260 [ 43.181761] [] unmap_vmas+0x102/0x1d0 [ 43.187193] [] exit_mmap+0x214/0x3f0 [ 43.192872] [] ? SyS_munmap+0xa0/0xa0 [ 43.198299] [] ? up_write+0x1a/0x60 [ 43.203550] [] mmput+0xf3/0x2d0 [ 43.208458] [] do_exit+0x906/0x27b0 [ 43.213709] [] ? release_task.part.19+0x1210/0x1210 [ 43.220506] [] ? up_write+0x1a/0x60 [ 43.225786] [] ? do_mprotect_pkey+0x71d/0x890 [ 43.231997] [] ? mprotect_fixup+0x930/0x930 [ 43.237949] [] do_group_exit+0x111/0x340 [ 43.243658] [] ? do_group_exit+0x340/0x340 [ 43.249534] [] SyS_exit_group+0x1d/0x20 [ 43.255144] [] do_syscall_64+0x1a6/0x490 [ 43.261078] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 43.267986] 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 [ 43.295195] RIP [] page_remove_rmap+0x37/0x6d0 [ 43.301530] RSP [ 43.305130] CR2: ffffeafff8d78020 [ 43.308690] ---[ end trace 1813f7877171c9a7 ]--- [ 43.313646] Kernel panic - not syncing: Fatal exception [ 43.319341] Dumping ftrace buffer: [ 43.322860] (ftrace buffer empty) [ 43.326546] Kernel Offset: disabled [ 43.330152] Rebooting in 86400 seconds..