[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 34.378512] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.909685] random: sshd: uninitialized urandom read (32 bytes read) [ 36.254599] random: sshd: uninitialized urandom read (32 bytes read) [ 37.664438] random: sshd: uninitialized urandom read (32 bytes read) [ 37.889385] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.17' (ECDSA) to the list of known hosts. [ 43.665648] random: sshd: uninitialized urandom read (32 bytes read) [ 43.792858] IPVS: ftp: loaded support on port[0] = 21 net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 45.174771] BUG: Bad rss-counter state mm:(____ptrval____) idx:1 val:2 [ 45.181574] BUG: non-zero pgtables_bytes on freeing mm: 8192 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 52.216562] list_del corruption. prev->next should be ffff880191a91090, but was 0000000091a91090 [ 52.225737] ------------[ cut here ]------------ [ 52.230506] kernel BUG at lib/list_debug.c:53! [ 52.235229] invalid opcode: 0000 [#1] SMP PTI [ 52.239769] CPU: 0 PID: 4570 Comm: syz-executor422 Not tainted 4.18.0-rc4+ #26 [ 52.247132] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.256518] RIP: 0010:__list_del_entry_valid+0x37c/0x440 [ 52.261959] Code: 48 c7 81 80 0c 00 00 00 00 00 00 c7 81 20 03 00 00 00 00 00 00 48 c7 c7 2e f7 dc 8a 31 c0 48 8b 75 c0 4c 89 e2 e8 a4 ab 2b fd <0f> 0b 66 90 eb fe 44 89 f7 e8 26 60 ae fd e9 88 fd ff ff 48 85 db [ 52.281363] RSP: 0018:ffff88018dfaf780 EFLAGS: 00010246 [ 52.286730] RAX: 0000000000000054 RBX: 0000000000000000 RCX: fc2c771a9b971b00 [ 52.294001] RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000cbe9440 [ 52.301288] RBP: ffff88018dfaf7d8 R08: 0000000000480020 R09: 0000000000000002 [ 52.308555] R10: 0000000000000000 R11: ffffffff8675b580 R12: 0000000091a91090 [ 52.315823] R13: ffff8801cc7330f0 R14: 00000000d46000a4 R15: 00000000ade000a7 [ 52.323105] FS: 000000000183d880(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 52.331328] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.337205] CR2: 00000000006d0118 CR3: 00000001bd29c000 CR4: 00000000001406f0 [ 52.344480] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.352139] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.359416] Call Trace: [ 52.362064] __free_vmap_area+0x2f5/0x650 [ 52.366226] __purge_vmap_area_lazy+0x2c1/0x3b0 [ 52.370923] free_vmap_area_noflush+0x1fa/0x230 [ 52.375614] remove_vm_area+0x3b9/0x460 [ 52.379614] __vunmap+0x34c/0x5d0 [ 52.383081] vfree+0x79/0x170 [ 52.386205] do_ipt_get_ctl+0x1150/0x11e0 [ 52.390399] ? compat_do_ipt_set_ctl+0x3df0/0x3df0 [ 52.395463] nf_getsockopt+0x481/0x4e0 [ 52.399389] ip_getsockopt+0x297/0x3f0 [ 52.403383] ? compat_ip_setsockopt+0x380/0x380 [ 52.408097] tcp_getsockopt+0x1c6/0x1f0 [ 52.412117] ? tcp_get_timestamping_opt_stats+0x14c0/0x14c0 [ 52.417857] sock_common_getsockopt+0x13f/0x180 [ 52.422557] ? sock_recv_errqueue+0x9d0/0x9d0 [ 52.427066] __sys_getsockopt+0x48c/0x550 [ 52.431253] __x64_sys_getsockopt+0x15d/0x1c0 [ 52.435775] ? __ia32_sys_setsockopt+0x1c0/0x1c0 [ 52.440535] do_syscall_64+0x15b/0x230 [ 52.444451] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 52.449641] RIP: 0033:0x4464fa [ 52.452860] Code: b8 10 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd d5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da d5 fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 52.472277] RSP: 002b:00000000007ee8e8 EFLAGS: 00000202 ORIG_RAX: 0000000000000037 [ 52.479997] RAX: ffffffffffffffda RBX: 00000000006d5180 RCX: 00000000004464fa [ 52.487279] RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003 [ 52.494559] RBP: 00000000006d5180 R08: 00000000007ee90c R09: 0000000000004000 [ 52.501830] R10: 00000000007eea10 R11: 0000000000000202 R12: 0000000000000003 [ 52.509109] R13: 00000000007eea10 R14: 00000000007ee910 R15: 0000000000000000 [ 52.516390] Modules linked in: [ 52.519590] Dumping ftrace buffer: [ 52.523120] (ftrace buffer empty) [ 52.528285] ---[ end trace a4eb8845acf2a302 ]--- [ 52.533233] RIP: 0010:__list_del_entry_valid+0x37c/0x440 [ 52.538772] Code: 48 c7 81 80 0c 00 00 00 00 00 00 c7 81 20 03 00 00 00 00 00 00 48 c7 c7 2e f7 dc 8a 31 c0 48 8b 75 c0 4c 89 e2 e8 a4 ab 2b fd <0f> 0b 66 90 eb fe 44 89 f7 e8 26 60 ae fd e9 88 fd ff ff 48 85 db [ 52.558705] RSP: 0018:ffff88018dfaf780 EFLAGS: 00010246 [ 52.564181] RAX: 0000000000000054 RBX: 0000000000000000 RCX: fc2c771a9b971b00 [ 52.571570] RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea000cbe9440 [ 52.578933] RBP: ffff88018dfaf7d8 R08: 0000000000480020 R09: 0000000000000002 [ 52.586296] R10: 0000000000000000 R11: ffffffff8675b580 R12: 0000000091a91090 [ 52.593709] R13: ffff8801cc7330f0 R14: 00000000d46000a4 R15: 00000000ade000a7 [ 52.601131] FS: 000000000183d880(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 52.609453] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.615423] CR2: 00000000006d0118 CR3: 00000001bd29c000 CR4: 00000000001406f0 [ 52.622825] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.630190] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.637549] Kernel panic - not syncing: Fatal exception [ 52.643463] Dumping ftrace buffer: [ 52.647004] (ftrace buffer empty) [ 52.650704] Kernel Offset: disabled [ 52.654335] Rebooting in 86400 seconds..