[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.826140] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.174976] random: sshd: uninitialized urandom read (32 bytes read) [ 21.592422] random: sshd: uninitialized urandom read (32 bytes read) [ 22.103757] random: sshd: uninitialized urandom read (32 bytes read) [ 22.240949] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 27.701816] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.792924] BUG: unable to handle kernel paging request at ffffeafff9178020 [ 27.800282] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.806531] PGD 0 [ 27.808480] [ 27.810111] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.814577] Dumping ftrace buffer: [ 27.818089] (ftrace buffer empty) [ 27.821772] Modules linked in: [ 27.825062] CPU: 1 PID: 3806 Comm: syz-executor511 Not tainted 4.9.120-gf85543b #76 [ 27.832820] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.842148] task: ffff8801b9874800 task.stack: ffff8801b7ba8000 [ 27.848187] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.856860] RSP: 0018:ffff8801b7baf948 EFLAGS: 00010246 [ 27.862279] RAX: dffffc0000000000 RBX: ffffeafff9178000 RCX: 0000000000000000 [ 27.869530] RDX: 1ffffd5fff22f004 RSI: ffffffff814f5128 RDI: ffffeafff9178000 [ 27.876776] RBP: ffff8801b7baf970 R08: 0000000000033e00 R09: 0000000000000001 [ 27.884020] R10: ffff8801b9874800 R11: 0000000000000001 R12: ffff8801b7bafc08 [ 27.891263] R13: ffffeafff9178020 R14: ffffeafff9178000 R15: 0000000000000001 [ 27.898512] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.906714] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.912579] CR2: ffffeafff9178020 CR3: 00000001baa78000 CR4: 00000000001606f0 [ 27.919828] Stack: [ 27.921953] ffffeafff9178020 ffff8801b7bafc08 ffff8801c5f8f800 ffffeafff9178000 [ 27.929940] ffff8801b7b072c0 ffff8801b7baf9c8 ffffffff8154bfcf ffff8801b7bafc18 [ 27.937935] ffff8801b7bafc10 ffff8801b7bafc88 00003ffe45e001e0 00000001c5f8f000 [ 27.945922] Call Trace: [ 27.948564] [] zap_huge_pmd+0x16f/0x860 [ 27.954176] [] unmap_page_range+0x12ad/0x1730 [ 27.960300] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.966596] [] unmap_single_vma+0x101/0x260 [ 27.972543] [] unmap_vmas+0x102/0x1d0 [ 27.977967] [] exit_mmap+0x214/0x3f0 [ 27.983315] [] ? SyS_munmap+0xa0/0xa0 [ 27.988764] [] ? up_write+0x1a/0x60 [ 27.994031] [] mmput+0xf3/0x2d0 [ 27.998932] [] do_exit+0x906/0x27b0 [ 28.004184] [] ? release_task.part.19+0x1210/0x1210 [ 28.010824] [] ? up_write+0x1a/0x60 [ 28.016077] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.022198] [] ? mprotect_fixup+0x930/0x930 [ 28.028143] [] do_group_exit+0x111/0x340 [ 28.033828] [] ? do_group_exit+0x340/0x340 [ 28.039695] [] SyS_exit_group+0x1d/0x20 [ 28.045294] [] do_syscall_64+0x1a6/0x490 [ 28.050977] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.057873] 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 [ 28.084714] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.091242] RSP [ 28.094839] CR2: ffffeafff9178020 [ 28.098416] ---[ end trace 7471efb90f4bc06a ]--- [ 28.103142] Kernel panic - not syncing: Fatal exception [ 28.108833] Dumping ftrace buffer: [ 28.112412] (ftrace buffer empty) [ 28.116105] Kernel Offset: disabled [ 28.119706] Rebooting in 86400 seconds..