[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.273713] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.213611] random: sshd: uninitialized urandom read (32 bytes read) [ 17.527080] random: sshd: uninitialized urandom read (32 bytes read) [ 18.010665] random: sshd: uninitialized urandom read (32 bytes read) [ 27.864120] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts. [ 33.369726] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.452090] BUG: unable to handle kernel paging request at ffffeafff9020020 [ 33.459574] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.465817] PGD 0 [ 33.467760] [ 33.469443] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.473946] Dumping ftrace buffer: [ 33.477467] (ftrace buffer empty) [ 33.481158] Modules linked in: [ 33.484446] CPU: 0 PID: 3797 Comm: syz-executor157 Not tainted 4.9.122-g54068d6 #26 [ 33.492212] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.501562] task: ffff8801b9000000 task.stack: ffff8801d9ae0000 [ 33.501573] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.501576] RSP: 0018:ffff8801d9ae7948 EFLAGS: 00010246 [ 33.501581] RAX: dffffc0000000000 RBX: ffffeafff9020000 RCX: 0000000000000000 [ 33.501584] RDX: 1ffffd5fff204004 RSI: ffffffff814f5918 RDI: ffffeafff9020000 [ 33.501588] RBP: ffff8801d9ae7970 R08: 0000000000034020 R09: 0000000000000001 [ 33.501591] R10: ffff8801b9000000 R11: 0000000000000001 R12: ffff8801d9ae7c08 [ 33.501595] R13: ffffeafff9020020 R14: ffffeafff9020000 R15: 0000000000000001 [ 33.501604] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.501607] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.501611] CR2: ffffeafff9020020 CR3: 00000001c83b7000 CR4: 00000000001606f0 [ 33.501616] Stack: [ 33.501629] ffffeafff9020020 ffff8801d9ae7c08 ffff8801c0eb7800 ffffeafff9020000 [ 33.501637] ffff8801b989b6e0 ffff8801d9ae79c8 ffffffff8154cb8f ffff8801d9ae7c18 [ 33.501645] ffff8801d9ae7c10 ffff8801d9ae7c88 00003ffe408001e0 00000001c0eb7000 [ 33.501647] Call Trace: [ 33.501656] [] zap_huge_pmd+0x16f/0x860 [ 33.501673] [] unmap_page_range+0x12ad/0x1730 [ 33.501691] [] ? vm_normal_page_pmd+0x310/0x310 [ 33.501699] [] unmap_single_vma+0x101/0x260 [ 33.501705] [] unmap_vmas+0x102/0x1d0 [ 33.501712] [] exit_mmap+0x214/0x3f0 [ 33.501717] [] ? SyS_munmap+0xa0/0xa0 [ 33.501726] [] ? up_write+0x1a/0x60 [ 33.501733] [] mmput+0xf3/0x2d0 [ 33.501740] [] do_exit+0x906/0x27b0 [ 33.501759] [] ? release_task.part.19+0x1210/0x1210 [ 33.501766] [] ? up_write+0x1a/0x60 [ 33.501772] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.501778] [] ? mprotect_fixup+0x930/0x930 [ 33.501785] [] do_group_exit+0x111/0x340 [ 33.501792] [] ? do_group_exit+0x340/0x340 [ 33.501799] [] SyS_exit_group+0x1d/0x20 [ 33.501806] [] do_syscall_64+0x1a6/0x490 [ 33.501814] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.501933] 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 [ 33.501941] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.501958] RSP [ 33.501961] CR2: ffffeafff9020020 [ 33.501980] ---[ end trace b2d1da44511f6ec7 ]--- [ 33.501984] Kernel panic - not syncing: Fatal exception [ 33.507957] Dumping ftrace buffer: [ 33.507959] (ftrace buffer empty) [ 33.507962] Kernel Offset: disabled [ 33.769456] Rebooting in 86400 seconds..