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Date: Mon, 25 Mar 2024 16:49:50 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Uros Bizjak <ubizjak@gmail.com>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>, Nadav Amit <namit@vmware.com>, "Andy
 Lutomirski" <luto@kernel.org>, Brian Gerst <brgerst@gmail.com>, Denys
 Vlasenko <dvlasenk@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, Linus
 Torvalds <torvalds@linux-foundation.org>, Peter Zijlstra
	<peterz@infradead.org>, Thomas Gleixner <tglx@linutronix.de>, Josh Poimboeuf
	<jpoimboe@redhat.com>, <linux-mm@kvack.org>, <oliver.sang@intel.com>
Subject: [linus:master] [x86/percpu]  ca42563486:
 BUG:unable_to_handle_page_fault_for_address
Message-ID: <202403251658.8e92a8bc-lkp@intel.com>
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hi, Uros Bizjak,

we reported an early crash issue for this commit last Oct.
https://lore.kernel.org/all/202310071301.a5113890-oliver.sang@intel.com/

as you mentioned at that time
"It is KASAN that is not compatible with named address spaces [1]."

now we noticed the commit is merged into mainline, and we observed a different
issue related with kcsan_setup_watchpoint. below detail report FYI.

[1] https://lore.kernel.org/lkml/CAHk-=wi6U-O1wdPOESuCE6QO2OaPu0hEzaig0uDOU4L5CREhug@mail.gmail.com/


Hello,

kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on:

commit: ca4256348660cb2162668ec3d13d1f921d05374a ("x86/percpu: Use C for percpu read/write accessors")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

[test failed on linus/master b3603fcb79b1036acae10602bffc4855a4b9af80]
[test failed on linux-next/master 226d3c72fcde130a99d760895ebdd20e78e02cb5]

in testcase: boot

compiler: gcc-12
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+-------------------------------------------------------------------------+------------+------------+
|                                                                         | 9a462b9eaf | ca42563486 |
+-------------------------------------------------------------------------+------------+------------+
| BUG:unable_to_handle_page_fault_for_address                             | 0          | 6          |
| Oops:#[##]                                                              | 0          | 6          |
| RIP:kcsan_setup_watchpoint                                              | 0          | 6          |
+-------------------------------------------------------------------------+------------+------------+


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@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202403251658.8e92a8bc-lkp@intel.com


[    1.416777][    C0] BUG: unable to handle page fault for address: 000000000002bd28
[    1.416777][    C0] #PF: supervisor read access in kernel mode
[    1.416777][    C0] #PF: error_code(0x0000) - not-present page
[    1.416777][    C0] PGD 0 P4D 0
[    1.416777][    C0] Oops: 0000 [#1] SMP
[    1.416777][    C0] CPU: 0 PID: 2 Comm: kthreadd Not tainted 6.5.0-11417-gca4256348660 #1 232bbe22019ca80af13d3fa459a6dc475e14d345
[    1.416777][    C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 1.416777][ C0] RIP: 0010:kcsan_setup_watchpoint (kernel/kcsan/core.c:353 kernel/kcsan/core.c:609) 
[ 1.416777][ C0] Code: d1 7e e9 ab fc ff ff 48 83 fd 08 0f 85 15 01 00 00 4d 8b 14 24 4d 89 d8 4d 31 d0 e9 d6 fe ff ff 48 83 fd 08 0f 85 f4 00 00 00 <4d> 8b 1c 24 e9 31 fe ff ff 9c 58 48 89 44 24 10 fa f6 c4 02 0f 84
All code
========
   0:	d1 7e e9             	sarl   -0x17(%rsi)
   3:	ab                   	stos   %eax,%es:(%rdi)
   4:	fc                   	cld
   5:	ff                   	(bad)
   6:	ff 48 83             	decl   -0x7d(%rax)
   9:	fd                   	std
   a:	08 0f                	or     %cl,(%rdi)
   c:	85 15 01 00 00 4d    	test   %edx,0x4d000001(%rip)        # 0x4d000013
  12:	8b 14 24             	mov    (%rsp),%edx
  15:	4d 89 d8             	mov    %r11,%r8
  18:	4d 31 d0             	xor    %r10,%r8
  1b:	e9 d6 fe ff ff       	jmp    0xfffffffffffffef6
  20:	48 83 fd 08          	cmp    $0x8,%rbp
  24:	0f 85 f4 00 00 00    	jne    0x11e
  2a:*	4d 8b 1c 24          	mov    (%r12),%r11		<-- trapping instruction
  2e:	e9 31 fe ff ff       	jmp    0xfffffffffffffe64
  33:	9c                   	pushf
  34:	58                   	pop    %rax
  35:	48 89 44 24 10       	mov    %rax,0x10(%rsp)
  3a:	fa                   	cli
  3b:	f6 c4 02             	test   $0x2,%ah
  3e:	0f                   	.byte 0xf
  3f:	84                   	.byte 0x84

Code starting with the faulting instruction
===========================================
   0:	4d 8b 1c 24          	mov    (%r12),%r11
   4:	e9 31 fe ff ff       	jmp    0xfffffffffffffe3a
   9:	9c                   	pushf
   a:	58                   	pop    %rax
   b:	48 89 44 24 10       	mov    %rax,0x10(%rsp)
  10:	fa                   	cli
  11:	f6 c4 02             	test   $0x2,%ah
  14:	0f                   	.byte 0xf
  15:	84                   	.byte 0x84
[    1.416777][    C0] RSP: 0000:ffffc90000003eb8 EFLAGS: 00010046
[    1.416777][    C0] RAX: 0000000000000000 RBX: ffff88842fc2b6e0 RCX: 0000000000000001
[    1.416777][    C0] RDX: 001000000002bd28 RSI: 0000000000000000 RDI: 000000000000002b
[    1.416777][    C0] RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
[    1.416777][    C0] R10: 0000000000000160 R11: 00000000aaaaaaab R12: 000000000002bd28
[    1.416777][    C0] R13: 000000000000002c R14: 0000000000000000 R15: ffffffff841f2200
[    1.416777][    C0] FS:  0000000000000000(0000) GS:ffff88842fc00000(0000) knlGS:0000000000000000
[    1.416777][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.416777][    C0] CR2: 000000000002bd28 CR3: 0000000003e38000 CR4: 00000000000406b0
[    1.416777][    C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    1.416777][    C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    1.416777][    C0] Call Trace:
[    1.416777][    C0]  <IRQ>
[ 1.416777][ C0] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) 
[ 1.416777][ C0] ? page_fault_oops (arch/x86/mm/fault.c:707) 
[ 1.416777][ C0] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1561) 
[ 1.416777][ C0] ? asm_exc_page_fault (arch/x86/include/asm/idtentry.h:570) 
[ 1.416777][ C0] ? kcsan_setup_watchpoint (kernel/kcsan/core.c:353 kernel/kcsan/core.c:609) 
[ 1.416777][ C0] ? rcu_is_cpu_rrupt_from_idle (kernel/rcu/tree.c:357) 
[ 1.416777][ C0] rcu_is_cpu_rrupt_from_idle (kernel/rcu/tree.c:357) 
[ 1.416777][ C0] rcu_sched_clock_irq (kernel/rcu/tree.c:3869 kernel/rcu/tree.c:2240) 
[ 1.416777][ C0] update_process_times (arch/x86/include/asm/preempt.h:27 kernel/time/timer.c:2073) 
[ 1.416777][ C0] tick_periodic (kernel/time/tick-common.c:102) 
[ 1.416777][ C0] tick_handle_periodic (kernel/time/tick-common.c:120) 
[ 1.416777][ C0] __sysvec_apic_timer_interrupt (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:207 arch/x86/include/asm/trace/irq_vectors.h:41 arch/x86/kernel/apic/apic.c:1081) 
[ 1.416777][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1074 (discriminator 14)) 
[    1.416777][    C0]  </IRQ>
[    1.416777][    C0]  <TASK>
[ 1.416777][ C0] asm_sysvec_apic_timer_interrupt (arch/x86/include/asm/idtentry.h:645) 
[ 1.416777][ C0] RIP: 0010:__tsan_read8 (arch/x86/include/asm/current.h:41 kernel/kcsan/core.c:206 kernel/kcsan/core.c:750 kernel/kcsan/core.c:1025) 
[ 1.416777][ C0] Code: 08 85 c9 7f 3e 8b 50 0c 85 d2 7e 57 48 83 78 28 00 75 7b 31 c0 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 45 31 d2 45 31 db c3 <65> 48 8b 04 25 c0 f8 02 00 8b 88 10 13 00 00 48 05 08 13 00 00 85
All code
========
   0:	08 85 c9 7f 3e 8b    	or     %al,-0x74c18037(%rbp)
   6:	50                   	push   %rax
   7:	0c 85                	or     $0x85,%al
   9:	d2 7e 57             	sarb   %cl,0x57(%rsi)
   c:	48 83 78 28 00       	cmpq   $0x0,0x28(%rax)
  11:	75 7b                	jne    0x8e
  13:	31 c0                	xor    %eax,%eax
  15:	31 d2                	xor    %edx,%edx
  17:	31 c9                	xor    %ecx,%ecx
  19:	31 f6                	xor    %esi,%esi
  1b:	31 ff                	xor    %edi,%edi
  1d:	45 31 c0             	xor    %r8d,%r8d
  20:	45 31 c9             	xor    %r9d,%r9d
  23:	45 31 d2             	xor    %r10d,%r10d
  26:	45 31 db             	xor    %r11d,%r11d
  29:	c3                   	ret
  2a:*	65 48 8b 04 25 c0 f8 	mov    %gs:0x2f8c0,%rax		<-- trapping instruction
  31:	02 00 
  33:	8b 88 10 13 00 00    	mov    0x1310(%rax),%ecx
  39:	48 05 08 13 00 00    	add    $0x1308,%rax
  3f:	85                   	.byte 0x85

Code starting with the faulting instruction
===========================================
   0:	65 48 8b 04 25 c0 f8 	mov    %gs:0x2f8c0,%rax
   7:	02 00 
   9:	8b 88 10 13 00 00    	mov    0x1310(%rax),%ecx
   f:	48 05 08 13 00 00    	add    $0x1308,%rax
  15:	85                   	.byte 0x85


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240325/202403251658.8e92a8bc-lkp@intel.com


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