Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.108' (ECDSA) to the list of known hosts. syzkaller login: [ 63.085377][ T6842] IPVS: ftp: loaded support on port[0] = 21 [ 63.100580][ T6838] IPVS: ftp: loaded support on port[0] = 21 [ 63.101451][ T6844] IPVS: ftp: loaded support on port[0] = 21 [ 63.112342][ T6845] IPVS: ftp: loaded support on port[0] = 21 [ 63.124857][ T6846] IPVS: ftp: loaded support on port[0] = 21 [ 63.131495][ T6843] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 77.280204][T13863] ------------[ cut here ]------------ [ 77.285730][T13863] ODEBUG: free active (active state 1) object type: rcu_head hint: 0x0 [ 77.294424][T13863] WARNING: CPU: 1 PID: 13863 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 [ 77.304068][T13863] Modules linked in: [ 77.307989][T13863] CPU: 1 PID: 13863 Comm: syz-executor686 Not tainted 5.9.0-rc2-next-20200828-syzkaller #0 [ 77.317968][T13863] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.328079][T13863] RIP: 0010:debug_print_object+0x160/0x250 [ 77.333901][T13863] Code: dd c0 70 94 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd c0 70 94 88 48 c7 c7 20 66 94 88 e8 ab 58 a4 fd <0f> 0b 83 05 93 b0 1b 07 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 [ 77.353554][T13863] RSP: 0018:ffffc90007ecfdd0 EFLAGS: 00010082 [ 77.359651][T13863] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 77.367644][T13863] RDX: ffff888092a46480 RSI: ffffffff815daa77 RDI: fffff52000fd9fac [ 77.375668][T13863] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ae720f8b [ 77.383680][T13863] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89c674c0 [ 77.391672][T13863] R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000 [ 77.399666][T13863] FS: 00007faa9d8c5700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 77.408612][T13863] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 77.415214][T13863] CR2: 00007fff67526860 CR3: 0000000097929000 CR4: 00000000001506e0 [ 77.423229][T13863] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 77.431216][T13863] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 77.439229][T13863] Call Trace: [ 77.442547][T13863] debug_check_no_obj_freed+0x301/0x41c [ 77.448122][T13863] kmem_cache_free.part.0+0x16d/0x1f0 [ 77.453515][T13863] task_work_run+0xdd/0x190 [ 77.458042][T13863] exit_to_user_mode_prepare+0x195/0x1c0 [ 77.463722][T13863] syscall_exit_to_user_mode+0x59/0x2b0 [ 77.469312][T13863] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.475657][T13863] RIP: 0033:0x446ac9 [ 77.479569][T13863] Code: e8 6c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 77.499187][T13863] RSP: 002b:00007faa9d8c4d88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 [ 77.507641][T13863] RAX: 0000000000000000 RBX: 00000000006dbc48 RCX: 0000000000446ac9 [ 77.515629][T13863] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 77.523638][T13863] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 77.531630][T13863] R10: 0000000020001100 R11: 0000000000000246 R12: 00000000006dbc4c [ 77.539644][T13863] R13: 0000000000000005 R14: 0000000000000004 R15: 00007faa9d8c56d0 [ 77.547663][T13863] Kernel panic - not syncing: panic_on_warn set ... [ 77.554300][T13863] CPU: 1 PID: 13863 Comm: syz-executor686 Not tainted 5.9.0-rc2-next-20200828-syzkaller #0 [ 77.564305][T13863] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.574374][T13863] Call Trace: [ 77.577691][T13863] dump_stack+0x18f/0x20d [ 77.582049][T13863] panic+0x2e3/0x75c [ 77.585966][T13863] ? __warn_printk+0xf3/0xf3 [ 77.590583][T13863] ? __warn.cold+0x1d/0xc1 [ 77.595044][T13863] ? __warn.cold+0x14/0xc1 [ 77.599500][T13863] ? debug_print_object+0x160/0x250 [ 77.604723][T13863] __warn.cold+0x38/0xc1 [ 77.608993][T13863] ? debug_print_object+0x160/0x250 [ 77.614214][T13863] report_bug+0x1bd/0x210 [ 77.618565][T13863] handle_bug+0x38/0x90 [ 77.622737][T13863] ? __warn_printk+0xc6/0xf3 [ 77.627346][T13863] exc_invalid_op+0x14/0x40 [ 77.631870][T13863] asm_exc_invalid_op+0x12/0x20 [ 77.636739][T13863] RIP: 0010:debug_print_object+0x160/0x250 [ 77.642562][T13863] Code: dd c0 70 94 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd c0 70 94 88 48 c7 c7 20 66 94 88 e8 ab 58 a4 fd <0f> 0b 83 05 93 b0 1b 07 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89 [ 77.662201][T13863] RSP: 0018:ffffc90007ecfdd0 EFLAGS: 00010082 [ 77.668312][T13863] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 77.676306][T13863] RDX: ffff888092a46480 RSI: ffffffff815daa77 RDI: fffff52000fd9fac [ 77.684296][T13863] RBP: 0000000000000001 R08: 0000000000000001 R09: ffff8880ae720f8b [ 77.692287][T13863] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89c674c0 [ 77.700274][T13863] R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000 [ 77.708294][T13863] ? vprintk_func+0x97/0x1a6 [ 77.712904][T13863] debug_check_no_obj_freed+0x301/0x41c [ 77.718475][T13863] kmem_cache_free.part.0+0x16d/0x1f0 [ 77.723866][T13863] task_work_run+0xdd/0x190 [ 77.728392][T13863] exit_to_user_mode_prepare+0x195/0x1c0 [ 77.734040][T13863] syscall_exit_to_user_mode+0x59/0x2b0 [ 77.739635][T13863] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.745541][T13863] RIP: 0033:0x446ac9 [ 77.749449][T13863] Code: e8 6c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 77.769085][T13863] RSP: 002b:00007faa9d8c4d88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9 [ 77.777549][T13863] RAX: 0000000000000000 RBX: 00000000006dbc48 RCX: 0000000000446ac9 [ 77.785539][T13863] RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 [ 77.793527][T13863] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 77.801511][T13863] R10: 0000000020001100 R11: 0000000000000246 R12: 00000000006dbc4c [ 77.809497][T13863] R13: 0000000000000005 R14: 0000000000000004 R15: 00007faa9d8c56d0 [ 77.818724][T13863] Kernel Offset: disabled [ 77.823154][T13863] Rebooting in 86400 seconds..