[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.594588] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.184905] random: sshd: uninitialized urandom read (32 bytes read) [ 19.541818] random: sshd: uninitialized urandom read (32 bytes read) [ 20.047425] random: sshd: uninitialized urandom read (32 bytes read) [ 31.570711] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 37.173802] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 37.254687] BUG: unable to handle kernel paging request at ffffeafff9030020 [ 37.262056] IP: [] page_remove_rmap+0x37/0x6d0 [ 37.268322] PGD 0 [ 37.270271] [ 37.271958] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.276439] Dumping ftrace buffer: [ 37.279958] (ftrace buffer empty) [ 37.283704] Modules linked in: [ 37.287088] CPU: 1 PID: 3781 Comm: syz-executor821 Not tainted 4.9.121-g681e57b #77 [ 37.294858] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.304195] task: ffff8801baca1800 task.stack: ffff8801d94b0000 [ 37.310224] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 37.318907] RSP: 0018:ffff8801d94b7948 EFLAGS: 00010246 [ 37.324327] RAX: dffffc0000000000 RBX: ffffeafff9030000 RCX: 0000000000000000 [ 37.331574] RDX: 1ffffd5fff206004 RSI: ffffffff814f5278 RDI: ffffeafff9030000 [ 37.338819] RBP: ffff8801d94b7970 R08: 0000000000034920 R09: 0000000000000001 [ 37.346073] R10: ffff8801baca1800 R11: 0000000000000001 R12: ffff8801d94b7c08 [ 37.353321] R13: ffffeafff9030020 R14: ffffeafff9030000 R15: 0000000000000001 [ 37.360569] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.368771] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.374629] CR2: ffffeafff9030020 CR3: 00000001c2ce8000 CR4: 00000000001606f0 [ 37.381879] Stack: [ 37.384027] ffffeafff9030020 ffff8801d94b7c08 ffff8801c2c54800 ffffeafff9030000 [ 37.392138] ffff8801bca4a420 ffff8801d94b79c8 ffffffff8154c20f ffff8801d94b7c18 [ 37.400226] ffff8801d94b7c10 ffff8801d94b7c88 00003ffe40c001e0 00000001c2c54000 [ 37.408333] Call Trace: [ 37.410901] [] zap_huge_pmd+0x16f/0x860 [ 37.416514] [] unmap_page_range+0x12ad/0x1730 [ 37.422634] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 37.428944] [] unmap_single_vma+0x101/0x260 [ 37.434889] [] unmap_vmas+0x102/0x1d0 [ 37.440340] [] exit_mmap+0x214/0x3f0 [ 37.445683] [] ? SyS_munmap+0xa0/0xa0 [ 37.451111] [] mmput+0xf3/0x2d0 [ 37.456117] [] do_exit+0x906/0x27b0 [ 37.461505] [] ? release_task.part.19+0x1210/0x1210 [ 37.468153] [] ? up_write+0x1a/0x60 [ 37.473414] [] ? do_mprotect_pkey+0x71d/0x890 [ 37.479539] [] ? mprotect_fixup+0x930/0x930 [ 37.485500] [] do_group_exit+0x111/0x340 [ 37.491300] [] ? do_group_exit+0x340/0x340 [ 37.497172] [] SyS_exit_group+0x1d/0x20 [ 37.502780] [] do_syscall_64+0x1a6/0x490 [ 37.508578] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 37.515481] 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 [ 37.542321] RIP [] page_remove_rmap+0x37/0x6d0 [ 37.548661] RSP [ 37.552519] CR2: ffffeafff9030020 [ 37.555951] ---[ end trace 71e0dccef4ad963b ]--- [ 37.560787] Kernel panic - not syncing: Fatal exception [ 37.566401] Dumping ftrace buffer: [ 37.569915] (ftrace buffer empty) [ 37.573602] Kernel Offset: disabled [ 37.577207] Rebooting in 86400 seconds..