Warning: Permanently added '10.128.0.107' (ECDSA) to the list of known hosts. executing program [ 90.756881][ T9568] IPVS: ftp: loaded support on port[0] = 21 [ 90.788866][ T9568] netlink: 16 bytes leftover after parsing attributes in process `syz-executor882'. [ 90.845294][ T9568] ------------[ cut here ]------------ [ 90.850802][ T9568] refcount_t: underflow; use-after-free. [ 90.856828][ T9568] WARNING: CPU: 1 PID: 9568 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0 [ 90.866293][ T9568] Kernel panic - not syncing: panic_on_warn set ... [ 90.873188][ T9568] CPU: 1 PID: 9568 Comm: syz-executor882 Not tainted 5.6.0-rc5-syzkaller #0 [ 90.881840][ T9568] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.891874][ T9568] Call Trace: [ 90.895167][ T9568] dump_stack+0x188/0x20d [ 90.899567][ T9568] ? refcount_warn_saturate+0x1d0/0x1e0 [ 90.905142][ T9568] panic+0x2e3/0x75c [ 90.909062][ T9568] ? add_taint.cold+0x16/0x16 [ 90.913732][ T9568] ? __probe_kernel_read+0x188/0x1d0 [ 90.919002][ T9568] ? __warn.cold+0x14/0x35 [ 90.923415][ T9568] ? __warn+0xd5/0x1c8 [ 90.927467][ T9568] ? refcount_warn_saturate+0x1d1/0x1e0 [ 90.932990][ T9568] __warn.cold+0x2f/0x35 [ 90.937233][ T9568] ? refcount_warn_saturate+0x1d1/0x1e0 [ 90.942765][ T9568] report_bug+0x27b/0x2f0 [ 90.947081][ T9568] do_error_trap+0x12b/0x220 [ 90.951663][ T9568] ? refcount_warn_saturate+0x1d1/0x1e0 [ 90.957188][ T9568] do_invalid_op+0x32/0x40 [ 90.962810][ T9568] ? refcount_warn_saturate+0x1d1/0x1e0 [ 90.968336][ T9568] invalid_op+0x23/0x30 [ 90.972483][ T9568] RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0 [ 90.978622][ T9568] Code: e9 db fe ff ff 48 89 df e8 ec 10 20 fe e9 8a fe ff ff e8 d2 4f e3 fd 48 c7 c7 80 aa 51 88 c6 05 c5 66 d2 06 01 e8 17 60 b5 fd <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55 [ 90.998480][ T9568] RSP: 0018:ffffc90001ea7d38 EFLAGS: 00010286 [ 91.004590][ T9568] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 91.012664][ T9568] RDX: 0000000000000000 RSI: ffffffff815bf511 RDI: fffff520003d4f99 [ 91.020619][ T9568] RBP: 0000000000000003 R08: ffff8880972c00c0 R09: 0000000000000000 [ 91.028569][ T9568] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888095144040 [ 91.036532][ T9568] R13: ffff888095144044 R14: 00000000000002ac R15: ffff888088752a40 [ 91.044511][ T9568] ? vprintk_func+0x81/0x17e [ 91.049092][ T9568] ? refcount_warn_saturate+0x1d1/0x1e0 [ 91.054627][ T9568] free_nsproxy+0x445/0x4a0 [ 91.059149][ T9568] switch_task_namespaces+0xaa/0xc0 [ 91.064346][ T9568] do_exit+0xb2f/0x2dd0 [ 91.068577][ T9568] ? mm_update_next_owner+0x7a0/0x7a0 [ 91.073973][ T9568] ? up_read+0x1ab/0x750 [ 91.078212][ T9568] ? mark_held_locks+0x9f/0xe0 [ 91.083407][ T9568] ? down_read_non_owner+0x470/0x470 [ 91.088697][ T9568] ? handle_mm_fault+0x491/0xa10 [ 91.093636][ T9568] do_group_exit+0x125/0x340 [ 91.098242][ T9568] __x64_sys_exit_group+0x3a/0x50 [ 91.103263][ T9568] do_syscall_64+0xf6/0x7d0 [ 91.107771][ T9568] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 91.113661][ T9568] RIP: 0033:0x43f998 [ 91.117678][ T9568] Code: 24 38 80 f9 3a 0f 85 5f 01 00 00 48 8d 74 24 34 48 8d 7c 24 38 83 ea 01 89 54 24 34 e8 61 f8 ff ff 83 f8 3c 41 89 c1 0f 87 3d <01> 00 00 8b 4c 24 34 85 c9 0f 8e 59 01 00 00 48 8b 54 24 38 c7 44 [ 91.137576][ T9568] RSP: 002b:00007ffe8bfb5c98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 91.146202][ T9568] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000043f998 [ 91.154344][ T9568] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 91.162476][ T9568] RBP: 00000000004bfa10 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 91.170582][ T9568] R10: 0000000120080522 R11: 0000000000000246 R12: 0000000000000001 [ 91.178567][ T9568] R13: 00000000006d11c0 R14: 0000000000000000 R15: 0000000000000000 [ 91.188086][ T9568] Kernel Offset: disabled [ 91.192477][ T9568] Rebooting in 86400 seconds..