[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.073449] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.315699] random: sshd: uninitialized urandom read (32 bytes read) [ 22.490289] random: sshd: uninitialized urandom read (32 bytes read) [ 22.973023] random: sshd: uninitialized urandom read (32 bytes read) [ 42.547241] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. [ 48.059901] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 48.144366] BUG: unable to handle kernel paging request at ffffeafff8d80020 [ 48.151722] IP: [] page_remove_rmap+0x37/0x6d0 [ 48.157972] PGD 0 [ 48.159918] [ 48.161536] Oops: 0000 [#1] PREEMPT SMP KASAN [ 48.166002] Dumping ftrace buffer: [ 48.169514] (ftrace buffer empty) [ 48.173246] Modules linked in: [ 48.176539] CPU: 1 PID: 3729 Comm: syz-executor805 Not tainted 4.9.121-g681e57b #77 [ 48.184395] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.193728] task: ffff8801c19d4800 task.stack: ffff8801bf540000 [ 48.199758] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 48.208433] RSP: 0018:ffff8801bf547948 EFLAGS: 00010246 [ 48.213852] RAX: dffffc0000000000 RBX: ffffeafff8d80000 RCX: 0000000000000000 [ 48.221093] RDX: 1ffffd5fff1b0004 RSI: ffffffff814f5278 RDI: ffffeafff8d80000 [ 48.228336] RBP: ffff8801bf547970 R08: 0000000000034480 R09: 0000000000000001 [ 48.235581] R10: ffff8801c19d4800 R11: 0000000000000001 R12: ffff8801bf547c08 [ 48.242822] R13: ffffeafff8d80020 R14: ffffeafff8d80000 R15: 0000000000000001 [ 48.250064] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 48.258261] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.264112] CR2: ffffeafff8d80020 CR3: 00000001c891f000 CR4: 00000000001606f0 [ 48.271468] Stack: [ 48.273591] ffffeafff8d80020 ffff8801bf547c08 ffff8801c099e800 ffffeafff8d80000 [ 48.281577] ffff8801c0560630 ffff8801bf5479c8 ffffffff8154c20f ffff8801bf547c18 [ 48.289561] ffff8801bf547c10 ffff8801bf547c88 00003ffe360001e0 00000001c099e000 [ 48.297543] Call Trace: [ 48.300119] [] zap_huge_pmd+0x16f/0x860 [ 48.305717] [] unmap_page_range+0x12ad/0x1730 [ 48.312000] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 48.318294] [] unmap_single_vma+0x101/0x260 [ 48.324238] [] unmap_vmas+0x102/0x1d0 [ 48.329659] [] exit_mmap+0x214/0x3f0 [ 48.334993] [] ? SyS_munmap+0xa0/0xa0 [ 48.340417] [] ? up_write+0x1a/0x60 [ 48.345664] [] mmput+0xf3/0x2d0 [ 48.350565] [] do_exit+0x906/0x27b0 [ 48.355812] [] ? release_task.part.19+0x1210/0x1210 [ 48.362450] [] ? up_write+0x1a/0x60 [ 48.367698] [] ? do_mprotect_pkey+0x71d/0x890 [ 48.373812] [] ? mprotect_fixup+0x930/0x930 [ 48.379753] [] do_group_exit+0x111/0x340 [ 48.385437] [] ? do_group_exit+0x340/0x340 [ 48.391298] [] SyS_exit_group+0x1d/0x20 [ 48.396896] [] do_syscall_64+0x1a6/0x490 [ 48.402584] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 48.409481] 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 [ 48.436428] RIP [] page_remove_rmap+0x37/0x6d0 [ 48.442758] RSP [ 48.446388] CR2: ffffeafff8d80020 [ 48.449825] ---[ end trace 2bcb3a10d57b253c ]--- [ 48.454558] Kernel panic - not syncing: Fatal exception [ 48.460195] Dumping ftrace buffer: [ 48.463708] (ftrace buffer empty) [ 48.467394] Kernel Offset: disabled [ 48.470995] Rebooting in 86400 seconds..