[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.595189] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.010675] random: sshd: uninitialized urandom read (32 bytes read) [ 20.333602] random: sshd: uninitialized urandom read (32 bytes read) [ 20.874604] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 26.629922] urandom_read: 1 callbacks suppressed [ 26.629925] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.715726] BUG: unable to handle kernel paging request at ffffeafff9118020 [ 26.723320] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.729584] PGD 0 [ 26.731531] [ 26.733374] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.738319] Dumping ftrace buffer: [ 26.741835] (ftrace buffer empty) [ 26.745523] Modules linked in: [ 26.748810] CPU: 0 PID: 3787 Comm: syz-executor773 Not tainted 4.9.120-gf85543b #24 [ 26.756614] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.765953] task: ffff8801ba39e000 task.stack: ffff8801b97f8000 [ 26.771984] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.780764] RSP: 0018:ffff8801b97ff948 EFLAGS: 00010246 [ 26.786188] RAX: dffffc0000000000 RBX: ffffeafff9118000 RCX: 0000000000000000 [ 26.793434] RDX: 1ffffd5fff223004 RSI: ffffffff814f5128 RDI: ffffeafff9118000 [ 26.800680] RBP: ffff8801b97ff970 R08: 0000000000034760 R09: 0000000000000001 [ 26.807928] R10: ffff8801ba39e000 R11: 0000000000000001 R12: ffff8801b97ffc08 [ 26.815172] R13: ffffeafff9118020 R14: ffffeafff9118000 R15: 0000000000000001 [ 26.822428] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.830630] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.836486] CR2: ffffeafff9118020 CR3: 00000001c7e04000 CR4: 00000000001606f0 [ 26.843737] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.850982] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.858322] Stack: [ 26.860445] ffffeafff9118020 ffff8801b97ffc08 ffff8801ba608800 ffffeafff9118000 [ 26.868441] ffff8801bb220948 ffff8801b97ff9c8 ffffffff8154bfcf ffff8801b97ffc18 [ 26.876620] ffff8801b97ffc10 ffff8801b97ffc88 00003ffe446001e0 00000001ba608000 [ 26.885151] Call Trace: [ 26.887718] [] zap_huge_pmd+0x16f/0x860 [ 26.893417] [] unmap_page_range+0x12ad/0x1730 [ 26.899539] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 26.905835] [] unmap_single_vma+0x101/0x260 [ 26.911783] [] unmap_vmas+0x102/0x1d0 [ 26.917321] [] exit_mmap+0x214/0x3f0 [ 26.922660] [] ? SyS_munmap+0xa0/0xa0 [ 26.928094] [] ? up_write+0x1a/0x60 [ 26.933349] [] mmput+0xf3/0x2d0 [ 26.938251] [] do_exit+0x906/0x27b0 [ 26.943501] [] ? release_task.part.19+0x1210/0x1210 [ 26.950139] [] ? up_write+0x1a/0x60 [ 26.955394] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.961622] [] ? mprotect_fixup+0x930/0x930 [ 26.967571] [] do_group_exit+0x111/0x340 [ 26.973257] [] ? do_group_exit+0x340/0x340 [ 26.979118] [] SyS_exit_group+0x1d/0x20 [ 26.984822] [] do_syscall_64+0x1a6/0x490 [ 26.990516] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.997413] 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 [ 27.024445] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.030877] RSP [ 27.034476] CR2: ffffeafff9118020 [ 27.037909] ---[ end trace 2e1c4c2e3836f12c ]--- [ 27.042650] Kernel panic - not syncing: Fatal exception [ 27.048423] Dumping ftrace buffer: [ 27.051942] (ftrace buffer empty) [ 27.055625] Kernel Offset: disabled [ 27.059223] Rebooting in 86400 seconds..