Hi, Since v5.0.3-rt1, glibc/nptl/tst-robustpi8.c causes the following crash. https://github.com/lattera/glibc/blob/master/nptl/tst-robustpi8.c root@intel-x86-64:~# ./tst-robustpi8 007: ------------[ cut here ]------------ 007: kernel BUG at /buildarea2/zhe/repo/linux-rt-devel/kernel/locking/rtmutex.c:1336! 007: invalid opcode: 0000 [#1] PREEMPT SMP PTI 007: CPU: 7 PID: 536 Comm: tst-robustpi8 Tainted: G W 5.0.3-yocto-preempt-rt+ #23 007: Hardware name: Intel Corporation Broadwell Client platform/Basking Ridge, BIOS BDW-E2R1.86C.0118.R01.1503110618 03/11/2015 007: RIP: 0010:task_blocks_on_rt_mutex+0x211/0x240 007: Code: 89 de 4c 89 e7 e8 0f f7 ff ff 4c 89 e7 e8 f7 f7 ff ff 49 8b 84 24 30 09 00 00 31 d2 48 83 f8 02 0f 97 c2 e9 07 ff ff ff 0f 0b <0f> 0b 0f 0b 48 89 5d c8 e9 99 fe ff ff b8 dd ff ff ff e9 61 ff ff 007: RSP: 0018:ffffa15c41adfab0 EFLAGS: 00010096 007: 007: RAX: ffffa15c41adfc80 RBX: ffffa15c41adfb50 RCX: 0000000000000000 007: RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9af85af288d0 007: RBP: ffffa15c41adfaf0 R08: 0000000000000001 R09: 0000000000000000 007: R10: 0000000000000000 R11: ffff9af85af283a8 R12: ffff9af85af20000 007: R13: ffff9af85af288d0 R14: ffff9af85af28000 R15: ffffa15c414a2308 007: FS: 00007fac9dd8b700(0000) GS:ffff9af878fc0000(0000) knlGS:0000000000000000 007: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 007: CR2: 000055fd7d150240 CR3: 000000005af18005 CR4: 00000000003606e0 007: Call Trace: 007: rt_spin_lock_slowlock_locked+0x87/0x230 007: rt_spin_lock_slowlock+0x67/0xa0 007: rt_spin_lock+0x38/0x40 007: ? futex_lock_pi+0x2cd/0x490 007: futex_lock_pi+0x2cd/0x490 007: ? hrtimer_init_sleeper+0x130/0x130 007: do_futex+0x330/0xc40 007: ? trace_hardirqs_on_thunk+0x1a/0x1c 007: ? _copy_from_user+0x36/0x70 007: __se_sys_futex+0x7f/0x170 007: __x64_sys_futex+0x29/0x30 007: do_syscall_64+0x55/0x130 007: entry_SYSCALL_64_after_hwframe+0x49/0xbe 007: RIP: 0033:0x7fac9f7590c4 007: Code: 85 c0 0f 84 ee 03 00 00 be 06 00 00 00 45 85 c0 0f 84 b0 04 00 00 4c 8b 54 24 18 ba 01 00 00 00 48 89 df b8 ca 00 00 00 0f 05 <3d> 00 f0 ff ff 0f 86 59 04 00 00 83 f8 92 74 72 89 c2 83 e2 df 83 007: RSP: 002b:00007fac9dd8ade0 EFLAGS: 00000202 007: ORIG_RAX: 00000000000000ca 007: RAX: ffffffffffffffda RBX: 00007fac9f7727d0 RCX: 00007fac9f7590c4 007: RDX: 0000000000000001 RSI: 0000000000000006 RDI: 00007fac9f7727d0 007: RBP: 00007fac9f7727e0 R08: 0000000000000010 R09: 0000000000000000 007: R10: 000055fd7d150240 R11: 0000000000000202 R12: 00007ffe550b363e 007: R13: 0000000000000218 R14: 00007fac9dd8b700 R15: 0000000000000000 007: Modules linked in: 007: 007: ---[ end trace ae0f59c8162f348b ]--- 007: RIP: 0010:task_blocks_on_rt_mutex+0x211/0x240 007: Code: 89 de 4c 89 e7 e8 0f f7 ff ff 4c 89 e7 e8 f7 f7 ff ff 49 8b 84 24 30 09 00 00 31 d2 48 83 f8 02 0f 97 c2 e9 07 ff ff ff 0f 0b <0f> 0b 0f 0b 48 89 5d c8 e9 99 fe ff ff b8 dd ff ff ff e9 61 ff ff 007: RSP: 0018:ffffa15c41adfab0 EFLAGS: 00010096 007: 007: RAX: ffffa15c41adfc80 RBX: ffffa15c41adfb50 RCX: 0000000000000000 007: RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9af85af288d0 007: RBP: ffffa15c41adfaf0 R08: 0000000000000001 R09: 0000000000000000 007: R10: 0000000000000000 R11: ffff9af85af283a8 R12: ffff9af85af20000 007: R13: ffff9af85af288d0 R14: ffff9af85af28000 R15: ffffa15c414a2308 007: FS: 00007fac9dd8b700(0000) GS:ffff9af878fc0000(0000) knlGS:0000000000000000 007: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 007: CR2: 000055fd7d150240 CR3: 000000005af18005 CR4: 00000000003606e0 Zhe
