[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.758329] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.352662] random: sshd: uninitialized urandom read (32 bytes read) [ 24.799514] random: sshd: uninitialized urandom read (32 bytes read) [ 25.304852] random: sshd: uninitialized urandom read (32 bytes read) [ 25.436210] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 30.855210] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.019470] BUG: unable to handle kernel paging request at ffffeafff9090020 [ 31.026864] IP: [] page_remove_rmap+0x37/0x6d0 [ 31.033114] PGD 0 [ 31.035065] [ 31.036685] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.041156] Dumping ftrace buffer: [ 31.044682] (ftrace buffer empty) [ 31.048366] Modules linked in: [ 31.051656] CPU: 0 PID: 3789 Comm: syz-executor801 Not tainted 4.9.120-gf85543b #76 [ 31.059420] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.068748] task: ffff8801b9a59800 task.stack: ffff8801b9058000 [ 31.074778] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 31.083459] RSP: 0018:ffff8801b905f6c0 EFLAGS: 00010246 [ 31.088946] RAX: dffffc0000000000 RBX: ffffeafff9090000 RCX: ffffea0006fb0000 [ 31.096198] RDX: 1ffffd5fff212004 RSI: ffffffff814f5128 RDI: ffffeafff9090000 [ 31.103444] RBP: ffff8801b905f6e8 R08: 0000000000033f20 R09: 0000000000000001 [ 31.110688] R10: ffff8801b9a59800 R11: 0000000000000001 R12: ffff8801b905f980 [ 31.117929] R13: ffffeafff9090020 R14: ffffeafff9090000 R15: 0000000000000001 [ 31.125189] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.133392] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.139250] CR2: ffffeafff9090020 CR3: 00000001bad70000 CR4: 00000000001606f0 [ 31.146497] Stack: [ 31.148623] ffffeafff9090020 ffff8801b905f980 ffff8801bae4b800 ffffeafff9090000 [ 31.156610] ffff8801b9bfb1b8 ffff8801b905f740 ffffffff8154bfcf ffff8801b905f990 [ 31.164597] ffff8801b905f988 ffff8801b905fa00 00003ffe424001e0 00000001bae4b000 [ 31.172581] Call Trace: [ 31.175148] [] zap_huge_pmd+0x16f/0x860 [ 31.180753] [] unmap_page_range+0x12ad/0x1730 [ 31.187828] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 31.194198] [] unmap_single_vma+0x101/0x260 [ 31.200230] [] unmap_vmas+0x102/0x1d0 [ 31.205660] [] exit_mmap+0x214/0x3f0 [ 31.210997] [] ? SyS_munmap+0xa0/0xa0 [ 31.216423] [] ? up_write+0x1a/0x60 [ 31.221751] [] mmput+0xf3/0x2d0 [ 31.226666] [] do_exit+0x906/0x27b0 [ 31.231920] [] ? debug_check_no_locks_freed+0x210/0x210 [ 31.238910] [] ? get_futex_key+0x1090/0x1090 [ 31.244941] [] ? change_protection+0xf0/0x1280 [ 31.251151] [] ? release_task.part.19+0x1210/0x1210 [ 31.257800] [] ? recalc_sigpending+0x72/0x90 [ 31.263835] [] do_group_exit+0x111/0x340 [ 31.269525] [] get_signal+0x4cf/0x1450 [ 31.275033] [] ? mprotect_fixup+0x437/0x930 [ 31.280980] [] do_signal+0x87/0x19f0 [ 31.286316] [] ? setup_sigcontext+0x7d0/0x7d0 [ 31.292432] [] ? do_mprotect_pkey+0x70c/0x890 [ 31.298594] [] ? do_futex+0x17c0/0x17c0 [ 31.304246] [] ? mprotect_fixup+0x930/0x930 [ 31.310198] [] ? exit_to_usermode_loop+0xac/0x120 [ 31.316665] [] exit_to_usermode_loop+0xe1/0x120 [ 31.322963] [] do_syscall_64+0x364/0x490 [ 31.328650] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.335550] 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 [ 31.362486] RIP [] page_remove_rmap+0x37/0x6d0 [ 31.368813] RSP [ 31.372413] CR2: ffffeafff9090020 [ 31.375842] ---[ end trace fcc9f0f77e6301ff ]--- [ 31.380570] Kernel panic - not syncing: Fatal exception [ 31.386237] Dumping ftrace buffer: [ 31.389771] (ftrace buffer empty) [ 31.393457] Kernel Offset: disabled [ 31.397060] Rebooting in 86400 seconds..