[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.407176] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.651467] random: sshd: uninitialized urandom read (32 bytes read) [ 19.148773] random: sshd: uninitialized urandom read (32 bytes read) [ 19.660146] random: sshd: uninitialized urandom read (32 bytes read) [ 22.039986] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts. [ 27.595733] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.675123] BUG: unable to handle kernel paging request at ffffeafff9050020 [ 27.682562] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.688821] PGD 0 [ 27.690771] [ 27.692406] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.696921] Dumping ftrace buffer: [ 27.700439] (ftrace buffer empty) [ 27.704127] Modules linked in: [ 27.707419] CPU: 1 PID: 3788 Comm: syz-executor059 Not tainted 4.9.121-g681e57b #25 [ 27.715190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.724523] task: ffff8801b983c800 task.stack: ffff8801ba330000 [ 27.730562] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.739248] RSP: 0018:ffff8801ba337948 EFLAGS: 00010246 [ 27.744676] RAX: dffffc0000000000 RBX: ffffeafff9050000 RCX: 0000000000000000 [ 27.751928] RDX: 1ffffd5fff20a004 RSI: ffffffff814f5278 RDI: ffffeafff9050000 [ 27.759174] RBP: ffff8801ba337970 R08: 0000000000033920 R09: 0000000000000001 [ 27.766425] R10: ffff8801b983c800 R11: 0000000000000001 R12: ffff8801ba337c08 [ 27.773680] R13: ffffeafff9050020 R14: ffffeafff9050000 R15: 0000000000000001 [ 27.780970] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.789292] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.795155] CR2: ffffeafff9050020 CR3: 00000001ca561000 CR4: 00000000001606f0 [ 27.802429] Stack: [ 27.804557] ffffeafff9050020 ffff8801ba337c08 ffff8801ca6cc800 ffffeafff9050000 [ 27.812571] ffff8801c7db2dc0 ffff8801ba3379c8 ffffffff8154c20f ffff8801ba337c18 [ 27.820557] ffff8801ba337c10 ffff8801ba337c88 00003ffe414001e0 00000001ca6cc000 [ 27.828644] Call Trace: [ 27.831222] [] zap_huge_pmd+0x16f/0x860 [ 27.836827] [] unmap_page_range+0x12ad/0x1730 [ 27.842957] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.849254] [] unmap_single_vma+0x101/0x260 [ 27.855205] [] unmap_vmas+0x102/0x1d0 [ 27.860687] [] exit_mmap+0x214/0x3f0 [ 27.866046] [] ? SyS_munmap+0xa0/0xa0 [ 27.871482] [] ? up_write+0x1a/0x60 [ 27.876744] [] mmput+0xf3/0x2d0 [ 27.881660] [] do_exit+0x906/0x27b0 [ 27.886929] [] ? release_task.part.19+0x1210/0x1210 [ 27.893579] [] ? up_write+0x1a/0x60 [ 27.898836] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.904979] [] ? mprotect_fixup+0x930/0x930 [ 27.910937] [] do_group_exit+0x111/0x340 [ 27.916632] [] ? do_group_exit+0x340/0x340 [ 27.922502] [] SyS_exit_group+0x1d/0x20 [ 27.928102] [] do_syscall_64+0x1a6/0x490 [ 27.933800] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.940707] 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 [ 27.967571] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.973908] RSP [ 27.977507] CR2: ffffeafff9050020 [ 27.980980] ---[ end trace 7ec790ede22f4ce1 ]--- [ 27.985723] Kernel panic - not syncing: Fatal exception [ 27.991420] Dumping ftrace buffer: [ 27.994957] (ftrace buffer empty) [ 27.998645] Kernel Offset: disabled [ 28.002249] Rebooting in 86400 seconds..