Warning: Permanently added '10.128.0.228' (ECDSA) to the list of known hosts. executing program gin: [ 74.531711][ T9468] IPVS: ftp: loaded support on port[0] = 21 [ 74.563873][ T9468] netlink: 16 bytes leftover after parsing attributes in process `syz-executor029'. [ 74.609807][ T9468] ------------[ cut here ]------------ [ 74.615336][ T9468] refcount_t: underflow; use-after-free. [ 74.621374][ T9468] WARNING: CPU: 1 PID: 9468 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0 [ 74.630741][ T9468] Kernel panic - not syncing: panic_on_warn set ... [ 74.637307][ T9468] CPU: 1 PID: 9468 Comm: syz-executor029 Not tainted 5.6.0-rc5-syzkaller #0 [ 74.645958][ T9468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.655991][ T9468] Call Trace: [ 74.659267][ T9468] dump_stack+0x188/0x20d [ 74.663580][ T9468] ? refcount_warn_saturate+0x1d0/0x1e0 [ 74.669141][ T9468] panic+0x2e3/0x75c [ 74.673017][ T9468] ? add_taint.cold+0x16/0x16 [ 74.677681][ T9468] ? __probe_kernel_read+0x188/0x1d0 [ 74.682941][ T9468] ? __warn.cold+0x14/0x35 [ 74.687366][ T9468] ? __warn+0xd5/0x1c8 [ 74.691416][ T9468] ? refcount_warn_saturate+0x1d1/0x1e0 [ 74.696935][ T9468] __warn.cold+0x2f/0x35 [ 74.701192][ T9468] ? refcount_warn_saturate+0x1d1/0x1e0 [ 74.706713][ T9468] report_bug+0x27b/0x2f0 [ 74.711026][ T9468] do_error_trap+0x12b/0x220 [ 74.715591][ T9468] ? refcount_warn_saturate+0x1d1/0x1e0 [ 74.721170][ T9468] do_invalid_op+0x32/0x40 [ 74.725578][ T9468] ? refcount_warn_saturate+0x1d1/0x1e0 [ 74.731106][ T9468] invalid_op+0x23/0x30 [ 74.735242][ T9468] RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0 [ 74.741373][ T9468] 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 85 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 [ 74.760959][ T9468] RSP: 0018:ffffc90001f87d38 EFLAGS: 00010286 [ 74.767010][ T9468] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 74.774957][ T9468] RDX: 0000000000000000 RSI: ffffffff815bf511 RDI: fffff520003f0f99 [ 74.782906][ T9468] RBP: 0000000000000003 R08: ffff888099326400 R09: 0000000000000000 [ 74.790853][ T9468] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a2dde040 [ 74.798803][ T9468] R13: ffff8880a2dde044 R14: 00000000000002ab R15: ffff8880a60593c0 [ 74.806804][ T9468] ? vprintk_func+0x81/0x17e [ 74.811379][ T9468] ? refcount_warn_saturate+0x1d1/0x1e0 [ 74.816915][ T9468] free_nsproxy+0x445/0x4a0 [ 74.821414][ T9468] switch_task_namespaces+0xaa/0xc0 [ 74.826608][ T9468] do_exit+0xb2f/0x2dd0 [ 74.830793][ T9468] ? mm_update_next_owner+0x7a0/0x7a0 [ 74.836147][ T9468] ? up_read+0x1ab/0x750 [ 74.840368][ T9468] ? mark_held_locks+0x9f/0xe0 [ 74.845115][ T9468] ? down_read_non_owner+0x470/0x470 [ 74.850387][ T9468] ? handle_mm_fault+0x491/0xa10 [ 74.855306][ T9468] do_group_exit+0x125/0x340 [ 74.859880][ T9468] __x64_sys_exit_group+0x3a/0x50 [ 74.864885][ T9468] do_syscall_64+0xf6/0x7d0 [ 74.869375][ T9468] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.875246][ T9468] RIP: 0033:0x43f998 [ 74.879119][ T9468] 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 [ 74.898696][ T9468] RSP: 002b:00007ffe5d800568 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 74.907078][ T9468] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000043f998 [ 74.915035][ T9468] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 74.923001][ T9468] RBP: 00000000004bfa10 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 74.931003][ T9468] R10: 0000000120080522 R11: 0000000000000246 R12: 0000000000000001 [ 74.938956][ T9468] R13: 00000000006d11c0 R14: 0000000000000000 R15: 0000000000000000 [ 74.948189][ T9468] Kernel Offset: disabled [ 74.952562][ T9468] Rebooting in 86400 seconds..