[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.849534] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.854634] random: sshd: uninitialized urandom read (32 bytes read) [ 20.340950] random: sshd: uninitialized urandom read (32 bytes read) [ 20.870731] random: sshd: uninitialized urandom read (32 bytes read) [ 21.092908] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 26.629975] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.716191] BUG: unable to handle kernel paging request at ffffeafff92c0020 [ 26.723906] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.730383] PGD 0 [ 26.732454] [ 26.734091] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.738571] Dumping ftrace buffer: [ 26.742094] (ftrace buffer empty) [ 26.745940] Modules linked in: [ 26.749250] CPU: 1 PID: 3799 Comm: syz-executor904 Not tainted 4.9.120-gf85543b #24 [ 26.757284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.766715] task: ffff8801b842e000 task.stack: ffff8801b7410000 [ 26.772762] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.782126] RSP: 0018:ffff8801b7417948 EFLAGS: 00010246 [ 26.787565] RAX: dffffc0000000000 RBX: ffffeafff92c0000 RCX: ffffea0006d38000 [ 26.794957] RDX: 1ffffd5fff258004 RSI: ffffffff814f5128 RDI: ffffeafff92c0000 [ 26.802480] RBP: ffff8801b7417970 R08: 0000000000034280 R09: 0000000000000001 [ 26.809900] R10: ffff8801b842e000 R11: 0000000000000001 R12: ffff8801b7417c08 [ 26.817287] R13: ffffeafff92c0020 R14: ffffeafff92c0000 R15: 0000000000000001 [ 26.824676] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.832896] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.838920] CR2: ffffeafff92c0020 CR3: 00000001cb3f0000 CR4: 00000000001606f0 [ 26.846182] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.853562] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.860819] Stack: [ 26.862957] ffffeafff92c0020 ffff8801b7417c08 ffff8801c6c05810 ffffeafff92c0000 [ 26.871391] ffff8801b702ce18 ffff8801b74179c8 ffffffff8154bfcf ffff8801b7417c18 [ 26.879448] ffff8801b7417c10 ffff8801b7417c88 00003ffe4b0001a0 00000001c6c05000 [ 26.887897] Call Trace: [ 26.890618] [] zap_huge_pmd+0x16f/0x860 [ 26.896350] [] unmap_page_range+0x12ad/0x1730 [ 26.902623] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 26.908935] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 26.915877] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.922895] [] unmap_single_vma+0x101/0x260 [ 26.928879] [] unmap_vmas+0x102/0x1d0 [ 26.934416] [] exit_mmap+0x214/0x3f0 [ 26.939926] [] ? SyS_munmap+0xa0/0xa0 [ 26.945367] [] ? up_write+0x1a/0x60 [ 26.950766] [] mmput+0xf3/0x2d0 [ 26.956104] [] do_exit+0x906/0x27b0 [ 26.961368] [] ? release_task.part.19+0x1210/0x1210 [ 26.968023] [] ? up_write+0x1a/0x60 [ 26.973287] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.979511] [] ? mprotect_fixup+0x930/0x930 [ 26.985678] [] do_group_exit+0x111/0x340 [ 26.991379] [] ? do_group_exit+0x340/0x340 [ 26.997482] [] SyS_exit_group+0x1d/0x20 [ 27.003104] [] do_syscall_64+0x1a6/0x490 [ 27.008930] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.015969] 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 [ 27.044884] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.051237] RSP [ 27.054847] CR2: ffffeafff92c0020 [ 27.058315] ---[ end trace 0c718c5a69138dc5 ]--- [ 27.063138] Kernel panic - not syncing: Fatal exception [ 27.069185] Dumping ftrace buffer: [ 27.072727] (ftrace buffer empty) [ 27.076428] Kernel Offset: disabled [ 27.080041] Rebooting in 86400 seconds..