[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.730947] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.711984] random: sshd: uninitialized urandom read (32 bytes read) [ 20.088881] random: sshd: uninitialized urandom read (32 bytes read) [ 20.640897] random: sshd: uninitialized urandom read (32 bytes read) [ 20.784966] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.21' (ECDSA) to the list of known hosts. [ 26.308556] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.391372] BUG: unable to handle kernel paging request at ffffeafff9178020 [ 26.398726] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.404978] PGD 0 [ 26.406925] [ 26.408545] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.413014] Dumping ftrace buffer: [ 26.416525] (ftrace buffer empty) [ 26.420207] Modules linked in: [ 26.423493] CPU: 0 PID: 3800 Comm: syz-executor744 Not tainted 4.9.120-gf85543b #24 [ 26.431260] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.440592] task: ffff8801b791b000 task.stack: ffff8801b6108000 [ 26.446619] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.455300] RSP: 0018:ffff8801b610f948 EFLAGS: 00010246 [ 26.460722] RAX: dffffc0000000000 RBX: ffffeafff9178000 RCX: 0000000000000000 [ 26.467966] RDX: 1ffffd5fff22f004 RSI: ffffffff814f5128 RDI: ffffeafff9178000 [ 26.475211] RBP: ffff8801b610f970 R08: 0000000000033fa0 R09: 0000000000000001 [ 26.482494] R10: ffff8801b791b000 R11: 0000000000000001 R12: ffff8801b610fc08 [ 26.489750] R13: ffffeafff9178020 R14: ffffeafff9178000 R15: 0000000000000001 [ 26.497009] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.505209] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.511066] CR2: ffffeafff9178020 CR3: 00000001c8342000 CR4: 00000000001606f0 [ 26.518312] Stack: [ 26.520436] ffffeafff9178020 ffff8801b610fc08 ffff8801bf62c800 ffffeafff9178000 [ 26.528428] ffff8801b711ae18 ffff8801b610f9c8 ffffffff8154bfcf ffff8801b610fc18 [ 26.536451] ffff8801b610fc10 ffff8801b610fc88 00003ffe45e001e0 00000001bf62c000 [ 26.544460] Call Trace: [ 26.547024] [] zap_huge_pmd+0x16f/0x860 [ 26.552629] [] unmap_page_range+0x12ad/0x1730 [ 26.558754] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 26.565051] [] unmap_single_vma+0x101/0x260 [ 26.571021] [] unmap_vmas+0x102/0x1d0 [ 26.576448] [] exit_mmap+0x214/0x3f0 [ 26.581799] [] ? SyS_munmap+0xa0/0xa0 [ 26.587227] [] ? up_write+0x1a/0x60 [ 26.592487] [] mmput+0xf3/0x2d0 [ 26.597392] [] do_exit+0x906/0x27b0 [ 26.602647] [] ? release_task.part.19+0x1210/0x1210 [ 26.609298] [] ? up_write+0x1a/0x60 [ 26.614569] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.620688] [] ? mprotect_fixup+0x930/0x930 [ 26.626636] [] do_group_exit+0x111/0x340 [ 26.632322] [] ? do_group_exit+0x340/0x340 [ 26.638180] [] SyS_exit_group+0x1d/0x20 [ 26.643784] [] do_syscall_64+0x1a6/0x490 [ 26.649474] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.656376] 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 [ 26.683595] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.689928] RSP [ 26.693525] CR2: ffffeafff9178020 [ 26.696952] ---[ end trace 1a07aec57ce90e5d ]--- [ 26.701679] Kernel panic - not syncing: Fatal exception [ 26.707310] Dumping ftrace buffer: [ 26.710837] (ftrace buffer empty) [ 26.714522] Kernel Offset: disabled [ 26.718122] Rebooting in 86400 seconds..