[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.115821] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.987919] random: sshd: uninitialized urandom read (32 bytes read) [ 31.396453] random: sshd: uninitialized urandom read (32 bytes read) [ 31.928407] random: sshd: uninitialized urandom read (32 bytes read) [ 32.076790] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 37.606438] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.700876] BUG: unable to handle kernel paging request at ffffeafff9150020 [ 37.708248] IP: [] page_remove_rmap+0x37/0x6d0 [ 37.714624] PGD 0 [ 37.716581] [ 37.718208] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.722696] Dumping ftrace buffer: [ 37.726206] (ftrace buffer empty) [ 37.729890] Modules linked in: [ 37.733196] CPU: 0 PID: 3808 Comm: syz-executor194 Not tainted 4.9.122-g54068d6 #78 [ 37.740966] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.750303] task: ffff8801d95c1800 task.stack: ffff8801b60b0000 [ 37.756336] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 37.765011] RSP: 0018:ffff8801b60b7948 EFLAGS: 00010246 [ 37.770437] RAX: dffffc0000000000 RBX: ffffeafff9150000 RCX: 0000000000000000 [ 37.777683] RDX: 1ffffd5fff22a004 RSI: ffffffff814f5918 RDI: ffffeafff9150000 [ 37.785038] RBP: ffff8801b60b7970 R08: 0000000000034480 R09: 0000000000000001 [ 37.792288] R10: ffff8801d95c1800 R11: 0000000000000001 R12: ffff8801b60b7c08 [ 37.799638] R13: ffffeafff9150020 R14: ffffeafff9150000 R15: 0000000000000001 [ 37.806894] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.815354] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.821226] CR2: ffffeafff9150020 CR3: 00000001c445d000 CR4: 00000000001606f0 [ 37.828469] Stack: [ 37.830603] ffffeafff9150020 ffff8801b60b7c08 ffff8801c85b0800 ffffeafff9150000 [ 37.838590] ffff8801d986f3c8 ffff8801b60b79c8 ffffffff8154cb8f ffff8801b60b7c18 [ 37.846607] ffff8801b60b7c10 ffff8801b60b7c88 00003ffe454001e0 00000001c85b0000 [ 37.854727] Call Trace: [ 37.857296] [] zap_huge_pmd+0x16f/0x860 [ 37.862976] [] unmap_page_range+0x12ad/0x1730 [ 37.869110] [] ? vm_normal_page_pmd+0x310/0x310 [ 37.875409] [] unmap_single_vma+0x101/0x260 [ 37.881417] [] unmap_vmas+0x102/0x1d0 [ 37.886886] [] exit_mmap+0x214/0x3f0 [ 37.892246] [] ? SyS_munmap+0xa0/0xa0 [ 37.897711] [] ? up_write+0x1a/0x60 [ 37.902989] [] mmput+0xf3/0x2d0 [ 37.907909] [] do_exit+0x906/0x27b0 [ 37.913273] [] ? release_task.part.19+0x1210/0x1210 [ 37.919946] [] ? up_write+0x1a/0x60 [ 37.925199] [] ? do_mprotect_pkey+0x71d/0x890 [ 37.931408] [] ? mprotect_fixup+0x930/0x930 [ 37.937364] [] do_group_exit+0x111/0x340 [ 37.943051] [] ? do_group_exit+0x340/0x340 [ 37.948910] [] SyS_exit_group+0x1d/0x20 [ 37.954512] [] do_syscall_64+0x1a6/0x490 [ 37.960197] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.967221] 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 [ 37.994303] RIP [] page_remove_rmap+0x37/0x6d0 [ 38.000699] RSP [ 38.004311] CR2: ffffeafff9150020 [ 38.007745] ---[ end trace 7f2d74fe9d73a1a6 ]--- [ 38.012591] Kernel panic - not syncing: Fatal exception [ 38.018388] Dumping ftrace buffer: [ 38.021911] (ftrace buffer empty) [ 38.025602] Kernel Offset: disabled [ 38.029202] Rebooting in 86400 seconds..