[paulmck-rcu:dev.2023.11.08a] [EXP locktorture] 1254a620b4: WARNING:at_kernel/rcu/tree_stall.h:#rcu_stall_chain_notifier_register

From: kernel test robot
Date: Thu Dec 07 2023 - 03:20:42 EST

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Hello,

kernel test robot noticed "WARNING:at_kernel/rcu/tree_stall.h:#rcu_stall_chain_notifier_register" on:

commit: 1254a620b4a3832e65ac01bcef769b99e34515b2 ("EXP locktorture: Add RCU CPU stall-warning notifier stub")
https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2023.11.08a

in testcase: locktorture
version:
with following parameters:

runtime: 300s
test: cpuhotplug

compiler: clang-16
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)

+-----------------------------------------------------------------------+------------+------------+
| | 11b2bc2909 | 1254a620b4 |
+-----------------------------------------------------------------------+------------+------------+
| WARNING:at_kernel/rcu/tree_stall.h:#rcu_stall_chain_notifier_register | 0 | 12 |
| RIP:rcu_stall_chain_notifier_register | 0 | 12 |
+-----------------------------------------------------------------------+------------+------------+

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202312071506.6eac1bac-oliver.sang@xxxxxxxxx

[ 200.668175][ T876] ------------[ cut here ]------------
[ 200.669199][ T876] Adding torture_spin_lock_dump+0x0/0x20 [locktorture]() to RCU stall notifier list (failed, so all is well).
[ 200.671183][ T876] WARNING: CPU: 1 PID: 876 at kernel/rcu/tree_stall.h:1088 rcu_stall_chain_notifier_register (kernel/rcu/tree_stall.h:1087)
[ 200.673094][ T876] Modules linked in: locktorture(+) torture
[ 200.674129][ T876] CPU: 1 PID: 876 Comm: modprobe Tainted: G W N 6.6.0-03747-g1254a620b4a3 #1 44194d056aabc0fb2e11ad706d62f862fdc5dd23
[ 200.676413][ T876] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 200.678192][ T876] RIP: 0010:rcu_stall_chain_notifier_register (kernel/rcu/tree_stall.h:1087)
[ 200.679403][ T876] Code: 89 df e8 2f 0c 35 00 48 8b 33 85 ed 48 c7 c0 00 cb 49 97 48 c7 c2 a0 ca 49 97 48 0f 44 d0 48 c7 c7 40 ca 49 97 e8 fc 69 e4 ff <0f> 0b 85 ed 74 13 48 c7 c7 20 c7 1d 99 48 89 de 5b 41 5e 5d e9 83
All code
========
0: 89 df mov %ebx,%edi
2: e8 2f 0c 35 00 call 0x350c36
7: 48 8b 33 mov (%rbx),%rsi
a: 85 ed test %ebp,%ebp
c: 48 c7 c0 00 cb 49 97 mov $0xffffffff9749cb00,%rax
13: 48 c7 c2 a0 ca 49 97 mov $0xffffffff9749caa0,%rdx
1a: 48 0f 44 d0 cmove %rax,%rdx
1e: 48 c7 c7 40 ca 49 97 mov $0xffffffff9749ca40,%rdi
25: e8 fc 69 e4 ff call 0xffffffffffe46a26
2a:* 0f 0b ud2 <-- trapping instruction
2c: 85 ed test %ebp,%ebp
2e: 74 13 je 0x43
30: 48 c7 c7 20 c7 1d 99 mov $0xffffffff991dc720,%rdi
37: 48 89 de mov %rbx,%rsi
3a: 5b pop %rbx
3b: 41 5e pop %r14
3d: 5d pop %rbp
3e: e9 .byte 0xe9
3f: 83 .byte 0x83

Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 85 ed test %ebp,%ebp
4: 74 13 je 0x19
6: 48 c7 c7 20 c7 1d 99 mov $0xffffffff991dc720,%rdi
d: 48 89 de mov %rbx,%rsi
10: 5b pop %rbx
11: 41 5e pop %r14
13: 5d pop %rbp
14: e9 .byte 0xe9
15: 83 .byte 0x83
[ 200.682780][ T876] RSP: 0018:ffffc90002b67978 EFLAGS: 00010246
[ 200.683857][ T876] RAX: 000000000000006b RBX: ffffffffc040a220 RCX: 0000000000000027
[ 200.685304][ T876] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8883aeb27a10
[ 200.686724][ T876] RBP: 0000000000000000 R08: ffff8883aeb27a13 R09: 1ffff11075d64f42
[ 200.688142][ T876] R10: dffffc0000000000 R11: ffffed1075d64f43 R12: ffff88814879e080
[ 200.689573][ T876] R13: ffffc90002b679e0 R14: dffffc0000000000 R15: dffffc0000000000
[ 200.690976][ T876] FS: 0000000000000000(0000) GS:ffff8883aeb00000(0063) knlGS:00000000f7aa9700
[ 200.692536][ T876] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
[ 200.693695][ T876] CR2: 000000005664b010 CR3: 0000000141a71000 CR4: 00000000000406f0
[ 200.695095][ T876] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 200.696540][ T876] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 200.698173][ T876] Call Trace:
[ 200.698865][ T876] <TASK>
[ 200.699476][ T876] ? __warn (kernel/panic.c:235 kernel/panic.c:673)
[ 200.700283][ T876] ? rcu_stall_chain_notifier_register (kernel/rcu/tree_stall.h:1087)
[ 200.701381][ T876] ? rcu_stall_chain_notifier_register (kernel/rcu/tree_stall.h:1087)
[ 200.702461][ T876] ? report_bug (lib/bug.c:?)
[ 200.703294][ T876] ? handle_bug (arch/x86/kernel/traps.c:237)
[ 200.704128][ T876] ? exc_invalid_op (arch/x86/kernel/traps.c:258)
[ 200.704995][ T876] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:568)
[ 200.705913][ T876] ? rcu_stall_chain_notifier_register (kernel/rcu/tree_stall.h:1087)
[ 200.707177][ T876] ? rcu_stall_chain_notifier_register (kernel/rcu/tree_stall.h:1087)
[ 200.708908][ T876] init_module (include/linux/cpumask.h:909 kernel/locking/locktorture.c:98 kernel/locking/locktorture.c:1051) locktorture
[ 200.710509][ T876] do_one_initcall (init/main.c:1232)
[ 200.711382][ T876] ? 0xffffffffc0418000
[ 200.712246][ T876] ? __asan_register_globals (mm/kasan/generic.c:229)
[ 200.713299][ T876] do_init_module (kernel/module/main.c:2530)
[ 200.714163][ T876] __se_sys_finit_module (kernel/module/main.c:3148 kernel/module/main.c:3166 kernel/module/main.c:3186 kernel/module/main.c:3169)
[ 200.715119][ T876] __do_fast_syscall_32 (arch/x86/entry/common.c:164)
[ 200.716056][ T876] do_fast_syscall_32 (arch/x86/entry/common.c:255)
[ 200.716965][ T876] entry_SYSENTER_compat_after_hwframe (arch/x86/entry/entry_64_compat.S:121)
[ 200.718040][ T876] RIP: 0023:0xf7fbb539
[ 200.718801][ T876] Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 cc 90 90 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00
All code
========
0: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
4: 10 07 adc %al,(%rdi)
6: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
a: 10 08 adc %cl,(%rax)
c: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
...
20: 00 51 52 add %dl,0x52(%rcx)
23: 55 push %rbp
24:* 89 e5 mov %esp,%ebp <-- trapping instruction
26: 0f 34 sysenter
28: cd 80 int $0x80
2a: 5d pop %rbp
2b: 5a pop %rdx
2c: 59 pop %rcx
2d: c3 ret
2e: cc int3
2f: 90 nop
30: 90 nop
31: 90 nop
32: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
39: 00 00 00
3c: 0f .byte 0xf
3d: 1f (bad)
3e: 44 rex.R
...

Code starting with the faulting instruction
===========================================
0: 5d pop %rbp
1: 5a pop %rdx
2: 59 pop %rcx
3: c3 ret
4: cc int3
5: 90 nop
6: 90 nop
7: 90 nop
8: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
f: 00 00 00
12: 0f .byte 0xf
13: 1f (bad)
14: 44 rex.R

The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20231207/202312071506.6eac1bac-oliver.sang@xxxxxxxxx

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Next message: Yicong Yang: "[PATCH 0/2] Perf fix two memory leakage"
Previous message: MD Danish Anwar: "[PATCH 2/3] arm64: dts: ti: k3-am642-evm: add ICSSG1 Ethernet support"
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