[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.853476] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.052498] random: sshd: uninitialized urandom read (32 bytes read) [ 35.471692] random: sshd: uninitialized urandom read (32 bytes read) [ 35.996118] random: sshd: uninitialized urandom read (32 bytes read) [ 36.132492] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.14' (ECDSA) to the list of known hosts. [ 41.646583] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 41.726637] BUG: unable to handle kernel paging request at ffffeafff8e88020 [ 41.734168] IP: [] page_remove_rmap+0x37/0x6d0 [ 41.740432] PGD 0 [ 41.742439] [ 41.744085] Oops: 0000 [#1] PREEMPT SMP KASAN [ 41.748561] Dumping ftrace buffer: [ 41.752077] (ftrace buffer empty) [ 41.755871] Modules linked in: [ 41.759162] CPU: 0 PID: 3810 Comm: syz-executor031 Not tainted 4.9.122-g54068d6 #78 [ 41.767207] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.776695] task: ffff8801b876e000 task.stack: ffff8801b68c8000 [ 41.782732] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 41.791531] RSP: 0018:ffff8801b68cf948 EFLAGS: 00010246 [ 41.796956] RAX: dffffc0000000000 RBX: ffffeafff8e88000 RCX: 0000000000000000 [ 41.804202] RDX: 1ffffd5fff1d1004 RSI: ffffffff814f5918 RDI: ffffeafff8e88000 [ 41.811446] RBP: ffff8801b68cf970 R08: 0000000000034820 R09: 0000000000000001 [ 41.818691] R10: ffff8801b876e000 R11: 0000000000000001 R12: ffff8801b68cfc08 [ 41.826018] R13: ffffeafff8e88020 R14: ffffeafff8e88000 R15: 0000000000000001 [ 41.833273] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 41.841485] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.847389] CR2: ffffeafff8e88020 CR3: 00000001c17e8000 CR4: 00000000001606f0 [ 41.854709] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.861963] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.869315] Stack: [ 41.871444] ffffeafff8e88020 ffff8801b68cfc08 ffff8801c00a7800 ffffeafff8e88000 [ 41.879549] ffff8801b8f6c688 ffff8801b68cf9c8 ffffffff8154cb8f ffff8801b68cfc18 [ 41.887654] ffff8801b68cfc10 ffff8801b68cfc88 00003ffe3a2001e0 00000001c00a7000 [ 41.895640] Call Trace: [ 41.898208] [] zap_huge_pmd+0x16f/0x860 [ 41.903815] [] unmap_page_range+0x12ad/0x1730 [ 41.909943] [] ? vm_normal_page_pmd+0x310/0x310 [ 41.916242] [] unmap_single_vma+0x101/0x260 [ 41.922204] [] unmap_vmas+0x102/0x1d0 [ 41.927737] [] exit_mmap+0x214/0x3f0 [ 41.933076] [] ? SyS_munmap+0xa0/0xa0 [ 41.938507] [] ? up_write+0x1a/0x60 [ 41.943764] [] mmput+0xf3/0x2d0 [ 41.948673] [] do_exit+0x906/0x27b0 [ 41.953926] [] ? release_task.part.19+0x1210/0x1210 [ 41.960575] [] ? up_write+0x1a/0x60 [ 41.965835] [] ? do_mprotect_pkey+0x71d/0x890 [ 41.971965] [] ? mprotect_fixup+0x930/0x930 [ 41.978024] [] do_group_exit+0x111/0x340 [ 41.983716] [] ? do_group_exit+0x340/0x340 [ 41.989581] [] SyS_exit_group+0x1d/0x20 [ 41.995304] [] do_syscall_64+0x1a6/0x490 [ 42.001001] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 42.007901] 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 [ 42.034818] RIP [] page_remove_rmap+0x37/0x6d0 [ 42.041149] RSP [ 42.044745] CR2: ffffeafff8e88020 [ 42.048367] ---[ end trace 0bb24e0727f241a8 ]--- [ 42.053111] Kernel panic - not syncing: Fatal exception [ 42.058806] Dumping ftrace buffer: [ 42.065326] (ftrace buffer empty) [ 42.069019] Kernel Offset: disabled [ 42.072623] Rebooting in 86400 seconds..