[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.901647] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.681008] random: sshd: uninitialized urandom read (32 bytes read) [ 27.166251] random: sshd: uninitialized urandom read (32 bytes read) [ 27.715933] random: sshd: uninitialized urandom read (32 bytes read) [ 27.849549] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 33.350147] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.434600] BUG: unable to handle kernel paging request at ffffeafff92b0020 [ 33.441947] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.448235] PGD 0 [ 33.450186] [ 33.451810] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.456275] Dumping ftrace buffer: [ 33.459787] (ftrace buffer empty) [ 33.463472] Modules linked in: [ 33.466757] CPU: 1 PID: 3799 Comm: syz-executor421 Not tainted 4.9.121-g681e57b #25 [ 33.474526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.483860] task: ffff8801b8ec6000 task.stack: ffff8801b6910000 [ 33.489888] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.498557] RSP: 0018:ffff8801b6917948 EFLAGS: 00010246 [ 33.503978] RAX: dffffc0000000000 RBX: ffffeafff92b0000 RCX: ffffea0006d48000 [ 33.511234] RDX: 1ffffd5fff256004 RSI: ffffffff814f5278 RDI: ffffeafff92b0000 [ 33.518489] RBP: ffff8801b6917970 R08: 0000000000033c80 R09: 0000000000000001 [ 33.525808] R10: ffff8801b8ec6000 R11: 0000000000000001 R12: ffff8801b6917c08 [ 33.533064] R13: ffffeafff92b0020 R14: ffffeafff92b0000 R15: 0000000000000001 [ 33.540308] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.548507] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.554364] CR2: ffffeafff92b0020 CR3: 00000001c649d000 CR4: 00000000001606f0 [ 33.561613] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.568860] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.576099] Stack: [ 33.578223] ffffeafff92b0020 ffff8801b6917c08 ffff8801bb650810 ffffeafff92b0000 [ 33.586208] ffff8801cb44e8f0 ffff8801b69179c8 ffffffff8154c20f ffff8801b6917c18 [ 33.594189] ffff8801b6917c10 ffff8801b6917c88 00003ffe4ac001a0 00000001bb650000 [ 33.602177] Call Trace: [ 33.604741] [] zap_huge_pmd+0x16f/0x860 [ 33.610337] [] unmap_page_range+0x12ad/0x1730 [ 33.616629] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.622926] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 33.629827] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.636644] [] unmap_single_vma+0x101/0x260 [ 33.642589] [] unmap_vmas+0x102/0x1d0 [ 33.648018] [] exit_mmap+0x214/0x3f0 [ 33.653355] [] ? SyS_munmap+0xa0/0xa0 [ 33.658787] [] ? up_write+0x1a/0x60 [ 33.664040] [] mmput+0xf3/0x2d0 [ 33.668947] [] do_exit+0x906/0x27b0 [ 33.674198] [] ? release_task.part.19+0x1210/0x1210 [ 33.680845] [] ? up_write+0x1a/0x60 [ 33.686208] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.692372] [] ? mprotect_fixup+0x930/0x930 [ 33.698325] [] do_group_exit+0x111/0x340 [ 33.704013] [] ? do_group_exit+0x340/0x340 [ 33.709869] [] SyS_exit_group+0x1d/0x20 [ 33.715469] [] do_syscall_64+0x1a6/0x490 [ 33.721172] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.728074] 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 [ 33.755031] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.761362] RSP [ 33.764958] CR2: ffffeafff92b0020 [ 33.768391] ---[ end trace 884ec82073577c68 ]--- [ 33.773115] Kernel panic - not syncing: Fatal exception [ 33.778803] Dumping ftrace buffer: [ 33.782326] (ftrace buffer empty) [ 33.786056] Kernel Offset: disabled [ 33.789665] Rebooting in 86400 seconds..