[Bug runtime/21860] New: on rawhide, the bz1027459.exp test case causes a kernel warning

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21860

            Bug ID: 21860
           Summary: on rawhide, the bz1027459.exp test case causes a
                    kernel warning
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

When I run the bz1027459.exp test case on rawhide
(4.13.0-0.rc1.git4.1.fc27.x86_64), the following appears on the console:

====
[ 4733.495697] WARNING: kernel stack frame pointer at ffffa35241bd3f28 in
stapio:2493 has bad value 0000000000008002
[ 4733.495704] unwind stack type:0 next_sp:          (null) mask:0x2
graph_idx:0
[ 4733.495712] ffffa35241bd3ac0: ffffa35241bd3b50 (0xffffa35241bd3b50)
[ 4733.495719] ffffa35241bd3ac8: ffffffffab03eb42
(__save_stack_trace+0x82/0x100)
[ 4733.495720] ffffa35241bd3ad0: 0000000000000000 ...
[ 4733.495720] ffffa35241bd3ad8: ffffa35241bd0000 (0xffffa35241bd0000)
[ 4733.495721] ffffa35241bd3ae0: ffffa35241bd4000 (0xffffa35241bd4000)
[ 4733.495721] ffffa35241bd3ae8: 0000000000000000 ...
[ 4733.495722] ffffa35241bd3af0: 0000000000000002 (0x2)
[ 4733.495723] ffffa35241bd3af8: ffff91ad604ab300 (0xffff91ad604ab300)
[ 4733.495723] ffffa35241bd3b00: 0000000100000000 (0x100000000)
[ 4733.495724] ffffa35241bd3b08: ffffa35241bd3f28 (0xffffa35241bd3f28)
[ 4733.495724] ffffa35241bd3b10: ffffa35241bd3ac0 (0xffffa35241bd3ac0)
[ 4733.495725] ffffa35241bd3b18: 0000000000000000 ...
[ 4733.495737] ffffa35241bd3b20: ffffffffab9a8a41
(entry_SYSCALL_64_fastpath+0x1f/0xbe)
[ 4733.495738] ffffa35241bd3b28: 7d50e2a66b924000 (0x7d50e2a66b924000)
[ 4733.495749] ffffa35241bd3b30: fffffffface4b628
(lock_classes+0xa59e8/0x3dfe20)
[ 4733.495750] ffffa35241bd3b38: ffff91ad604ac040 (0xffff91ad604ac040)
[ 4733.495750] ffffa35241bd3b40: ffff91ad604ab300 (0xffff91ad604ab300)
[ 4733.495751] ffffa35241bd3b48: 000000000000000c (0xc)
[ 4733.495751] ffffa35241bd3b50: ffffa35241bd3b60 (0xffffa35241bd3b60)
[ 4733.495752] ffffa35241bd3b58: ffffffffab03ebdb (save_stack_trace+0x1b/0x20)
[ 4733.495753] ffffa35241bd3b60: ffffa35241bd3b78 (0xffffa35241bd3b78)
[ 4733.495758] ffffa35241bd3b68: ffffffffab112dbb (save_trace+0x3b/0xb0)
[ 4733.495758] ffffa35241bd3b70: 0000000000001000 (0x1000)
[ 4733.495759] ffffa35241bd3b78: ffffa35241bd3bc0 (0xffffa35241bd3bc0)
[ 4733.495760] ffffa35241bd3b80: ffffffffab11647e (mark_lock+0x16e/0x4f0)
[ 4733.495762] ffffa35241bd3b88: ffffffffab069a65
(kvm_sched_clock_read+0x25/0x40)
[ 4733.495763] ffffa35241bd3b90: ffffa35241bd3ba0 (0xffffa35241bd3ba0)
[ 4733.495763] ffffa35241bd3b98: ffff91ad604ac040 (0xffff91ad604ac040)
[ 4733.495764] ffffa35241bd3ba0: ffff91ad604ab300 (0xffff91ad604ab300)
[ 4733.495764] ffffa35241bd3ba8: 0000000000000558 (0x558)
[ 4733.495765] ffffa35241bd3bb0: 0000000000000000 ...
[ 4733.495765] ffffa35241bd3bc0: ffffa35241bd3c90 (0xffffa35241bd3c90)
[ 4733.495767] ffffa35241bd3bc8: ffffffffab1170bf (__lock_acquire+0x31f/0x13b0)
[ 4733.495771] ffffa35241bd3bd0: ffffffffc0573986 (stp_print_flush+0x56/0x250
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495772] ffffa35241bd3bd8: 0000000000000001 (0x1)
[ 4733.495772] ffffa35241bd3be0: ffffa35200000001 (0xffffa35200000001)
[ 4733.495773] ffffa35241bd3be8: ffff91ad604ac040 (0xffff91ad604ac040)
[ 4733.495773] ffffa35241bd3bf0: ffffffff00000000 (0xffffffff00000000)
[ 4733.495774] ffffa35241bd3bf8: 0000000100000000 (0x100000000)
[ 4733.495774] ffffa35241bd3c00: 153bbb4e00000001 (0x153bbb4e00000001)
[ 4733.495775] ffffa35241bd3c08: ffff91ad604ac040 (0xffff91ad604ac040)
[ 4733.495778] ffffa35241bd3c10: fffffffface497c0
(lock_classes+0xa3b80/0x3dfe20)
[ 4733.495778] ffffa35241bd3c18: ffffffff00000001 (0xffffffff00000001)
[ 4733.495779] ffffa35241bd3c20: ffff91ad00000000 (0xffff91ad00000000)
[ 4733.495780] ffffa35241bd3c28: ffffffffab116a2d (trace_hardirqs_on+0xd/0x10)
[ 4733.495781] ffffa35241bd3c30: ffffffffacdb82c0
(lock_classes+0x12680/0x3dfe20)
[ 4733.495783] ffffa35241bd3c38: ffffffffab9a81bc
(_raw_spin_unlock_irq+0x2c/0x40)
[ 4733.495783] ffffa35241bd3c40: ffffffffacdaa3f0
(lock_classes+0x47b0/0x3dfe20)
[ 4733.495784] ffffa35241bd3c48: 0000000000000000 ...
[ 4733.495786] ffffa35241bd3c50: ffffffffab0e2146
(finish_task_switch+0xa6/0x260)
[ 4733.495787] ffffa35241bd3c58: 7d50e2a66b924000 (0x7d50e2a66b924000)
[ 4733.495787] ffffa35241bd3c60: 0000000000000000 ...
[ 4733.495787] ffffa35241bd3c68: ffffa35241bd3cb0 (0xffffa35241bd3cb0)
[ 4733.495788] ffffa35241bd3c70: 0000000000000000 ...
[ 4733.495788] ffffa35241bd3c88: 0000000000000001 (0x1)
[ 4733.495789] ffffa35241bd3c90: ffffa35241bd3d10 (0xffffa35241bd3d10)
[ 4733.495790] ffffa35241bd3c98: ffffffffab118bc3 (lock_acquire+0xa3/0x1f0)
[ 4733.495791] ffffa35241bd3ca0: ffff91ad604ab300 (0xffff91ad604ab300)
[ 4733.495792] ffffa35241bd3ca8: ffffffffab118bc3 (lock_acquire+0xa3/0x1f0)
[ 4733.495792] ffffa35241bd3cb0: 0000000000000000 ...
[ 4733.495795] ffffa35241bd3cb8: ffffffffc0573986 (stp_print_flush+0x56/0x250
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495795] ffffa35241bd3cc0: 0000000000000000 ...
[ 4733.495795] ffffa35241bd3cd0: 0000000000000046 (0x46)
[ 4733.495799] ffffa35241bd3cd8: ffffffffc05a2418
(_stp_print_lock+0x18/0xfffffffffffe3c00
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495799] ffffa35241bd3ce0: 0000000000000082 (0x82)
[ 4733.495802] ffffa35241bd3ce8: ffffffffc05a2418
(_stp_print_lock+0x18/0xfffffffffffe3c00
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495805] ffffa35241bd3cf0: ffffffffc05a2400
(stp_global+0x60/0xfffffffffffe3c60
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495805] ffffa35241bd3cf8: 0000000000000082 (0x82)
[ 4733.495806] ffffa35241bd3d00: ffff91ad7fc0d9c0 (0xffff91ad7fc0d9c0)
[ 4733.495806] ffffa35241bd3d08: ffffa35241bd3e70 (0xffffa35241bd3e70)
[ 4733.495807] ffffa35241bd3d10: ffffa35241bd3d40 (0xffffa35241bd3d40)
[ 4733.495808] ffffa35241bd3d18: ffffffffab9a88ed
(_raw_spin_lock_irqsave+0x4d/0x90)
[ 4733.495810] ffffa35241bd3d20: ffffffffc0573986 (stp_print_flush+0x56/0x250
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495811] ffffa35241bd3d28: ffffc3523fc07dc4 (0xffffc3523fc07dc4)
[ 4733.495811] ffffa35241bd3d30: 0000000000000003 (0x3)
[ 4733.495812] ffffa35241bd3d38: 0000000000000000 ...
[ 4733.495812] ffffa35241bd3d40: ffffa35241bd3d88 (0xffffa35241bd3d88)
[ 4733.495814] ffffa35241bd3d48: ffffffffc0573986 (stp_print_flush+0x56/0x250
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495815] ffffa35241bd3d50: ffffa35241bd3d70 (0xffffa35241bd3d70)
[ 4733.495815] ffffa35241bd3d58: 0000000000000046 (0x46)
[ 4733.495816] ffffa35241bd3d60: ffffa35240b81000 (0xffffa35240b81000)
[ 4733.495816] ffffa35241bd3d68: 0000000000002cb9 (0x2cb9)
[ 4733.495817] ffffa35241bd3d70: 00000000907d4231 (0x907d4231)
[ 4733.495817] ffffa35241bd3d78: ffff91ad7fc0d9c0 (0xffff91ad7fc0d9c0)
[ 4733.495818] ffffa35241bd3d80: ffffa35241bd3e70 (0xffffa35241bd3e70)
[ 4733.495818] ffffa35241bd3d88: ffffa35241bd3da0 (0xffffa35241bd3da0)
[ 4733.495820] ffffa35241bd3d90: ffffffffc057df29 (probe_3748+0x59/0xe0
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495828] ffffa35241bd3d98: ffffffffab2e5291 (SyS_fcntl+0x1/0xb0)
[ 4733.495829] ffffa35241bd3da0: ffffa35241bd3de8 (0xffffa35241bd3de8)
[ 4733.495831] ffffa35241bd3da8: ffffffffc0583bc5
(enter_kprobe_probe+0x175/0x390 [stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495832] ffffa35241bd3db0: ffffa35241bd3e70 (0xffffa35241bd3e70)
[ 4733.495832] ffffa35241bd3db8: ffffa35241bd3e70 (0xffffa35241bd3e70)
[ 4733.495833] ffffa35241bd3dc0: ffffa35240b81000 (0xffffa35240b81000)
[ 4733.495835] ffffa35241bd3dc8: 7d50e2a66b924000 (0x7d50e2a66b924000)
[ 4733.495835] ffffa35241bd3dd0: 0000000000000292 (0x292)
[ 4733.495838] ffffa35241bd3dd8: ffffffffc05cbc30
(stap_kprobes+0x18ab0/0xfffffffffffd2e80
[stap_931a595a59f2211fe1c8a91e2af17972_2_2493])
[ 4733.495839] ffffa35241bd3de0: ffffffffab2e5291 (SyS_fcntl+0x1/0xb0)
[ 4733.495840] ffffa35241bd3de8: ffffa35241bd3e28 (0xffffa35241bd3e28)
[ 4733.495844] ffffa35241bd3df0: ffffffffab0659d9
(kprobe_ftrace_handler+0xe9/0x150)
[ 4733.495844] ffffa35241bd3df8: ffffffffab2e5295 (SyS_fcntl+0x5/0xb0)
[ 4733.495845] ffffa35241bd3e00: 0000000000000800 (0x800)
[ 4733.495853] ffffa35241bd3e08: ffffffffac1761c0 (user_ns_cachep+0x8/0x8)
[ 4733.495853] ffffa35241bd3e10: 00007ffe5db00b80 (0x7ffe5db00b80)
[ 4733.495854] ffffa35241bd3e18: 0000000000000000 ...
[ 4733.495854] ffffa35241bd3e20: 0000000000000001 (0x1)
[ 4733.495855] ffffa35241bd3e28: ffffa35241bd3e60 (0xffffa35241bd3e60)
[ 4733.495860] ffffa35241bd3e30: ffffffffab1abef3
(ftrace_ops_assist_func+0x73/0x120)
[ 4733.495860] ffffa35241bd3e38: 0000000000000246 (0x246)
[ 4733.495861] ffffa35241bd3e40: 0000000000000246 (0x246)
[ 4733.495861] ffffa35241bd3e48: 000000008be68685 (0x8be68685)
[ 4733.495861] ffffa35241bd3e50: 0000000000000000 ...
[ 4733.495862] ffffa35241bd3e58: 00007ffe5dafea34 (0x7ffe5dafea34)
[ 4733.495863] ffffa35241bd3e60: ffffa35241bd3f18 (0xffffa35241bd3f18)
[ 4733.495863] ffffa35241bd3e68: ffffffffc031f0d5 (0xffffffffc031f0d5)
[ 4733.495864] ffffa35241bd3e70: 0000000000000001 (0x1)
[ 4733.495864] ffffa35241bd3e78: 0000000000000000 ...
[ 4733.495864] ffffa35241bd3e80: 00007ffe5db00b80 (0x7ffe5db00b80)
[ 4733.495865] ffffa35241bd3e88: 00007ffe5dafea34 (0x7ffe5dafea34)
[ 4733.495865] ffffa35241bd3e90: 0000000000008002 (0x8002)
[ 4733.495866] ffffa35241bd3e98: 0000000000000000 ...
[ 4733.495866] ffffa35241bd3ea0: ffff91ad604ab300 (0xffff91ad604ab300)
[ 4733.495867] ffffa35241bd3ea8: 00007f303407a9d0 (0x7f303407a9d0)
[ 4733.495867] ffffa35241bd3eb0: 00007f303407a700 (0x7f303407a700)
[ 4733.495867] ffffa35241bd3eb8: 0000000000000000 ...
[ 4733.495868] ffffa35241bd3ec0: 0000000000000048 (0x48)
[ 4733.495868] ffffa35241bd3ec8: 00007f303407a9d0 (0x7f303407a9d0)
[ 4733.495869] ffffa35241bd3ed0: 0000000000008802 (0x8802)
[ 4733.495869] ffffa35241bd3ed8: 0000000000000004 (0x4)
[ 4733.495870] ffffa35241bd3ee0: 0000000000000004 (0x4)
[ 4733.495870] ffffa35241bd3ee8: 00007ffe5dafea34 (0x7ffe5dafea34)
[ 4733.495871] ffffa35241bd3ef0: ffffffffab2e5290 (do_fcntl+0x770/0x770)
[ 4733.495872] ffffa35241bd3ef8: 0000000000000010 (0x10)
[ 4733.495872] ffffa35241bd3f00: 0000000000000297 (0x297)
[ 4733.495873] ffffa35241bd3f08: ffffa35241bd3f50 (0xffffa35241bd3f50)
[ 4733.495873] ffffa35241bd3f10: 0000000000000018 (0x18)
[ 4733.495874] ffffa35241bd3f18: ffffa35241bd3f28 (0xffffa35241bd3f28)
[ 4733.495874] ffffa35241bd3f20: ffffffffab2e5295 (SyS_fcntl+0x5/0xb0)
[ 4733.495875] ffffa35241bd3f28: 0000000000008002 (0x8002)
[ 4733.495876] ffffa35241bd3f30: ffffffffab9a8a41
(entry_SYSCALL_64_fastpath+0x1f/0xbe)
[ 4733.495877] ffffa35241bd3f38: 0000000000008002 (0x8002)
[ 4733.495877] ffffa35241bd3f40: 0000000000000297 (0x297)
[ 4733.495878] ffffa35241bd3f48: ffffffffab2e5295 (SyS_fcntl+0x5/0xb0)
[ 4733.495879] ffffa35241bd3f50: ffffffffab9a8a41
(entry_SYSCALL_64_fastpath+0x1f/0xbe)
[ 4733.495880] ffffa35241bd3f58: 0000000000000000 ...
[ 4733.495880] ffffa35241bd3f68: 00007ffe5dafd690 (0x7ffe5dafd690)
[ 4733.495881] ffffa35241bd3f70: 00007f3034079fc0 (0x7f3034079fc0)
[ 4733.495881] ffffa35241bd3f78: 00007ffe5dafd700 (0x7ffe5dafd700)
[ 4733.495882] ffffa35241bd3f80: 00007f303407a700 (0x7f303407a700)
[ 4733.495882] ffffa35241bd3f88: 0000000000000293 (0x293)
[ 4733.495883] ffffa35241bd3f90: 00007f303407a9d0 (0x7f303407a9d0)
[ 4733.495883] ffffa35241bd3f98: 00007f303407a700 (0x7f303407a700)
[ 4733.495883] ffffa35241bd3fa0: 0000000000000000 ...
[ 4733.495884] ffffa35241bd3fa8: ffffffffffffffda (0xffffffffffffffda)
[ 4733.495884] ffffa35241bd3fb0: 00007f30356dc4cf (0x7f30356dc4cf)
[ 4733.495886] ffffa35241bd3fb8: 0000000000008802 (0x8802)
[ 4733.495887] ffffa35241bd3fc0: 0000000000000004 (0x4)
[ 4733.495887] ffffa35241bd3fc8: 0000000000000004 (0x4)
[ 4733.495888] ffffa35241bd3fd0: 0000000000000048 (0x48)
[ 4733.495888] ffffa35241bd3fd8: 00007f30356dc4cf (0x7f30356dc4cf)
[ 4733.495889] ffffa35241bd3fe0: 0000000000000033 (0x33)
[ 4733.495889] ffffa35241bd3fe8: 0000000000000293 (0x293)
[ 4733.495890] ffffa35241bd3ff0: 00007ffe5dafe7f0 (0x7ffe5dafe7f0)
[ 4733.495890] ffffa35241bd3ff8: 000000000000002b (0x2b)
====

Note that this warning does also appear with the pre-bpf code.

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