[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.620489] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.448132] random: sshd: uninitialized urandom read (32 bytes read) [ 20.817680] random: sshd: uninitialized urandom read (32 bytes read) [ 21.357547] random: sshd: uninitialized urandom read (32 bytes read) [ 30.996722] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 36.611218] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.695703] BUG: unable to handle kernel paging request at ffffeafff9068020 [ 36.703062] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.709365] PGD 0 [ 36.711309] [ 36.712933] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.717413] Dumping ftrace buffer: [ 36.720928] (ftrace buffer empty) [ 36.724614] Modules linked in: [ 36.727963] CPU: 1 PID: 3783 Comm: syz-executor321 Not tainted 4.9.121-g681e57b #77 [ 36.735734] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.745066] task: ffff8801bc174800 task.stack: ffff8801d9548000 [ 36.751096] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.759772] RSP: 0018:ffff8801d954f948 EFLAGS: 00010246 [ 36.765197] RAX: dffffc0000000000 RBX: ffffeafff9068000 RCX: 0000000000000000 [ 36.772445] RDX: 1ffffd5fff20d004 RSI: ffffffff814f5278 RDI: ffffeafff9068000 [ 36.779687] RBP: ffff8801d954f970 R08: 0000000000034140 R09: 0000000000000001 [ 36.786931] R10: ffff8801bc174800 R11: 0000000000000001 R12: ffff8801d954fc08 [ 36.794181] R13: ffffeafff9068020 R14: ffffeafff9068000 R15: 0000000000000001 [ 36.801432] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 36.809634] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.815491] CR2: ffffeafff9068020 CR3: 00000001c3f88000 CR4: 00000000001606f0 [ 36.822850] Stack: [ 36.824982] ffffeafff9068020 ffff8801d954fc08 ffff8801c3fb0800 ffffeafff9068000 [ 36.833043] ffff8801bbde6f78 ffff8801d954f9c8 ffffffff8154c20f ffff8801d954fc18 [ 36.841031] ffff8801d954fc10 ffff8801d954fc88 00003ffe41a001e0 00000001c3fb0000 [ 36.849037] Call Trace: [ 36.851603] [] zap_huge_pmd+0x16f/0x860 [ 36.857208] [] unmap_page_range+0x12ad/0x1730 [ 36.863329] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 36.869619] [] unmap_single_vma+0x101/0x260 [ 36.875568] [] unmap_vmas+0x102/0x1d0 [ 36.881004] [] exit_mmap+0x214/0x3f0 [ 36.886341] [] ? SyS_munmap+0xa0/0xa0 [ 36.891772] [] ? up_write+0x1a/0x60 [ 36.897046] [] mmput+0xf3/0x2d0 [ 36.901948] [] do_exit+0x906/0x27b0 [ 36.907199] [] ? release_task.part.19+0x1210/0x1210 [ 36.913842] [] ? up_write+0x1a/0x60 [ 36.919100] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.925223] [] ? mprotect_fixup+0x930/0x930 [ 36.931172] [] do_group_exit+0x111/0x340 [ 36.936858] [] ? do_group_exit+0x340/0x340 [ 36.942719] [] SyS_exit_group+0x1d/0x20 [ 36.948316] [] do_syscall_64+0x1a6/0x490 [ 36.954001] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.960933] 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 [ 36.987740] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.994074] RSP [ 36.997669] CR2: ffffeafff9068020 [ 37.001095] ---[ end trace 9a88217f1bc4c859 ]--- [ 37.005824] Kernel panic - not syncing: Fatal exception [ 37.011539] Dumping ftrace buffer: [ 37.015061] (ftrace buffer empty) [ 37.018745] Kernel Offset: disabled [ 37.022344] Rebooting in 86400 seconds..