[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.691474] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.399578] random: sshd: uninitialized urandom read (32 bytes read) [ 20.815066] random: sshd: uninitialized urandom read (32 bytes read) [ 21.366351] random: sshd: uninitialized urandom read (32 bytes read) [ 27.796525] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 33.210018] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.289230] BUG: unable to handle kernel paging request at ffffeafff9120020 [ 33.296589] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.302837] PGD 0 [ 33.304785] [ 33.306406] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.310877] Dumping ftrace buffer: [ 33.314391] (ftrace buffer empty) [ 33.318074] Modules linked in: [ 33.321371] CPU: 1 PID: 3797 Comm: syz-executor018 Not tainted 4.9.120-gf85543b #24 [ 33.329141] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.338469] task: ffff8801b88b6000 task.stack: ffff8801b62d0000 [ 33.344499] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.353180] RSP: 0018:ffff8801b62d7948 EFLAGS: 00010246 [ 33.358600] RAX: dffffc0000000000 RBX: ffffeafff9120000 RCX: 0000000000000000 [ 33.365848] RDX: 1ffffd5fff224004 RSI: ffffffff814f5128 RDI: ffffeafff9120000 [ 33.373097] RBP: ffff8801b62d7970 R08: 00000000000346c0 R09: 0000000000000001 [ 33.380355] R10: ffff8801b88b6000 R11: 0000000000000001 R12: ffff8801b62d7c08 [ 33.387600] R13: ffffeafff9120020 R14: ffffeafff9120000 R15: 0000000000000001 [ 33.394848] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.403052] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.408907] CR2: ffffeafff9120020 CR3: 00000001cb11c000 CR4: 00000000001606f0 [ 33.416154] Stack: [ 33.418278] ffffeafff9120020 ffff8801b62d7c08 ffff8801cc42d800 ffffeafff9120000 [ 33.426261] ffff8801b8888108 ffff8801b62d79c8 ffffffff8154bfcf ffff8801b62d7c18 [ 33.434246] ffff8801b62d7c10 ffff8801b62d7c88 00003ffe448001e0 00000001cc42d000 [ 33.442255] Call Trace: [ 33.444842] [] zap_huge_pmd+0x16f/0x860 [ 33.450470] [] unmap_page_range+0x12ad/0x1730 [ 33.456676] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.462997] [] unmap_single_vma+0x101/0x260 [ 33.469016] [] unmap_vmas+0x102/0x1d0 [ 33.474461] [] exit_mmap+0x214/0x3f0 [ 33.479819] [] ? SyS_munmap+0xa0/0xa0 [ 33.485251] [] ? up_write+0x1a/0x60 [ 33.490517] [] mmput+0xf3/0x2d0 [ 33.495474] [] do_exit+0x906/0x27b0 [ 33.500736] [] ? release_task.part.19+0x1210/0x1210 [ 33.507384] [] ? up_write+0x1a/0x60 [ 33.512640] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.518765] [] ? mprotect_fixup+0x930/0x930 [ 33.524800] [] do_group_exit+0x111/0x340 [ 33.530511] [] ? do_group_exit+0x340/0x340 [ 33.536373] [] SyS_exit_group+0x1d/0x20 [ 33.541970] [] do_syscall_64+0x1a6/0x490 [ 33.547657] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.554556] 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 [ 33.581459] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.587847] RSP [ 33.591562] CR2: ffffeafff9120020 [ 33.594997] ---[ end trace 2a2cdcab1dda15bf ]--- [ 33.599728] Kernel panic - not syncing: Fatal exception [ 33.605356] Dumping ftrace buffer: [ 33.608879] (ftrace buffer empty) [ 33.612567] Kernel Offset: disabled [ 33.616169] Rebooting in 86400 seconds..