[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.608929] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.722532] random: sshd: uninitialized urandom read (32 bytes read) [ 17.064129] random: sshd: uninitialized urandom read (32 bytes read) [ 17.554313] random: sshd: uninitialized urandom read (32 bytes read) [ 24.429004] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 29.918933] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.997811] BUG: unable to handle kernel paging request at ffffeafff9028020 [ 30.005153] IP: [] page_remove_rmap+0x37/0x6d0 [ 30.011403] PGD 0 [ 30.013345] [ 30.014965] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.019431] Dumping ftrace buffer: [ 30.022946] (ftrace buffer empty) [ 30.026628] Modules linked in: [ 30.029927] CPU: 0 PID: 3798 Comm: syz-executor873 Not tainted 4.9.122-g54068d6 #26 [ 30.037688] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.047016] task: ffff8801b67ab000 task.stack: ffff8801b8338000 [ 30.053048] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 30.061731] RSP: 0018:ffff8801b833f948 EFLAGS: 00010246 [ 30.067155] RAX: dffffc0000000000 RBX: ffffeafff9028000 RCX: 0000000000000000 [ 30.074417] RDX: 1ffffd5fff205004 RSI: ffffffff814f5918 RDI: ffffeafff9028000 [ 30.081677] RBP: ffff8801b833f970 R08: 0000000000034160 R09: 0000000000000001 [ 30.088920] R10: ffff8801b67ab000 R11: 0000000000000001 R12: ffff8801b833fc08 [ 30.096164] R13: ffffeafff9028020 R14: ffffeafff9028000 R15: 0000000000000001 [ 30.103406] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.111606] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.117528] CR2: ffffeafff9028020 CR3: 00000001b905a000 CR4: 00000000001606f0 [ 30.124783] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.132026] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.139270] Stack: [ 30.141392] ffffeafff9028020 ffff8801b833fc08 ffff8801b9064800 ffffeafff9028000 [ 30.149387] ffff8801da32c210 ffff8801b833f9c8 ffffffff8154cb8f ffff8801b833fc18 [ 30.157377] ffff8801b833fc10 ffff8801b833fc88 00003ffe40a001e0 00000001b9064000 [ 30.165358] Call Trace: [ 30.167924] [] zap_huge_pmd+0x16f/0x860 [ 30.173522] [] unmap_page_range+0x12ad/0x1730 [ 30.179647] [] ? vm_normal_page_pmd+0x310/0x310 [ 30.185941] [] unmap_single_vma+0x101/0x260 [ 30.191886] [] unmap_vmas+0x102/0x1d0 [ 30.197314] [] exit_mmap+0x214/0x3f0 [ 30.202666] [] ? SyS_munmap+0xa0/0xa0 [ 30.208099] [] mmput+0xf3/0x2d0 [ 30.213006] [] do_exit+0x906/0x27b0 [ 30.218262] [] ? release_task.part.19+0x1210/0x1210 [ 30.224903] [] ? up_write+0x1a/0x60 [ 30.230156] [] ? do_mprotect_pkey+0x71d/0x890 [ 30.236281] [] ? mprotect_fixup+0x930/0x930 [ 30.242230] [] do_group_exit+0x111/0x340 [ 30.248015] [] ? do_group_exit+0x340/0x340 [ 30.253880] [] SyS_exit_group+0x1d/0x20 [ 30.259479] [] do_syscall_64+0x1a6/0x490 [ 30.265169] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 30.272063] 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 [ 30.298836] RIP [] page_remove_rmap+0x37/0x6d0 [ 30.305160] RSP [ 30.308755] CR2: ffffeafff9028020 [ 30.312186] ---[ end trace 14d10ce2407dc7b0 ]--- [ 30.316916] Kernel panic - not syncing: Fatal exception [ 30.322734] Dumping ftrace buffer: [ 30.326260] (ftrace buffer empty) [ 30.329945] Kernel Offset: disabled [ 30.333548] Rebooting in 86400 seconds..