[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.353781] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.900850] random: sshd: uninitialized urandom read (32 bytes read) [ 27.578297] random: sshd: uninitialized urandom read (32 bytes read) [ 27.981787] random: sshd: uninitialized urandom read (32 bytes read) [ 28.108347] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. [ 33.644545] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.722397] BUG: unable to handle kernel paging request at ffffeafff90f0020 [ 33.729746] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.736049] PGD 0 [ 33.738004] [ 33.739630] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.744197] Dumping ftrace buffer: [ 33.747713] (ftrace buffer empty) [ 33.751401] Modules linked in: [ 33.754692] CPU: 0 PID: 3798 Comm: syz-executor644 Not tainted 4.9.121-g681e57b #25 [ 33.762459] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.771790] task: ffff8801b6829800 task.stack: ffff8801b7190000 [ 33.777819] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.786541] RSP: 0018:ffff8801b7197948 EFLAGS: 00010246 [ 33.791977] RAX: dffffc0000000000 RBX: ffffeafff90f0000 RCX: 0000000000000000 [ 33.799221] RDX: 1ffffd5fff21e004 RSI: ffffffff814f5278 RDI: ffffeafff90f0000 [ 33.806467] RBP: ffff8801b7197970 R08: 0000000000033b60 R09: 0000000000000001 [ 33.813715] R10: ffff8801b6829800 R11: 0000000000000001 R12: ffff8801b7197c08 [ 33.820959] R13: ffffeafff90f0020 R14: ffffeafff90f0000 R15: 0000000000000001 [ 33.828208] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.836409] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.842316] CR2: ffffeafff90f0020 CR3: 00000001c2ef4000 CR4: 00000000001606f0 [ 33.849566] Stack: [ 33.851733] ffffeafff90f0020 ffff8801b7197c08 ffff8801c197a800 ffffeafff90f0000 [ 33.859769] ffff8801c185d370 ffff8801b71979c8 ffffffff8154c20f ffff8801b7197c18 [ 33.867761] ffff8801b7197c10 ffff8801b7197c88 00003ffe43c001e0 00000001c197a000 [ 33.875761] Call Trace: [ 33.878333] [] zap_huge_pmd+0x16f/0x860 [ 33.883950] [] unmap_page_range+0x12ad/0x1730 [ 33.890082] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.896388] [] unmap_single_vma+0x101/0x260 [ 33.902341] [] unmap_vmas+0x102/0x1d0 [ 33.907771] [] exit_mmap+0x214/0x3f0 [ 33.913108] [] ? SyS_munmap+0xa0/0xa0 [ 33.918535] [] ? up_write+0x1a/0x60 [ 33.923791] [] mmput+0xf3/0x2d0 [ 33.928697] [] do_exit+0x906/0x27b0 [ 33.933954] [] ? release_task.part.19+0x1210/0x1210 [ 33.940598] [] ? up_write+0x1a/0x60 [ 33.945855] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.951988] [] ? mprotect_fixup+0x930/0x930 [ 33.957941] [] do_group_exit+0x111/0x340 [ 33.963634] [] ? do_group_exit+0x340/0x340 [ 33.969763] [] SyS_exit_group+0x1d/0x20 [ 33.975366] [] do_syscall_64+0x1a6/0x490 [ 33.981142] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.988060] 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 [ 34.014943] RIP [] page_remove_rmap+0x37/0x6d0 [ 34.021288] RSP [ 34.025107] CR2: ffffeafff90f0020 [ 34.028543] ---[ end trace 25c58a9a7ec1d7af ]--- [ 34.033273] Kernel panic - not syncing: Fatal exception [ 34.039311] Dumping ftrace buffer: [ 34.042903] (ftrace buffer empty) [ 34.046595] Kernel Offset: disabled [ 34.050290] Rebooting in 86400 seconds..