Re: [Bug 216646] having TRANSPARENT_HUGEPAGE enabled hangs some applications (supervisor read access in kernel mode)

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Hi, this is your Linux kernel regression tracker. Top-posting for once,
to make this easily accessible to everyone.

Was some progress made to get this regression resolved? From here it
looks kinda stalled, that's why I'm asking -- but maybe I just missed
something.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.

On 06.12.22 03:08, Mikhail Pletnev wrote:
> On Mon, 5 Dec 2022 20:25:11 +0000
> Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
>>
>> Thanks!  I think this may be the problem ...
>>
> 
> Hi Matthew, thanks for swift response, i've applied your last patch and ran my stress test a couple of times. It's still constistently crashing (albeit it seems in a different place):
> 
> [ 1975.257126] ***BAD SIBLING*** index 912583 offset 4
> [ 1975.257128] node ffff9fc817e01ff0 offset 51 parent ffff9fc5c7a31ff0 shift 0 count 64 values 48 array ffff9fc521173e80 list ffff9fc817e02008 ffff9fc817e02008 marks 0 0 0
> [ 1975.257133] BUG: kernel NULL pointer dereference, address: 0000000000000036
> [ 1975.257135] #PF: supervisor read access in kernel mode
> [ 1975.257137] #PF: error_code(0x0000) - not-present page
> [ 1975.257138] PGD 0 P4D 0
> [ 1975.257139] Oops: 0000 [#1] PREEMPT SMP NOPTI
> [ 1975.257141] CPU: 5 PID: 8303 Comm: deluge-gtk Not tainted 5.17.0-rc4_ap_test-00163-g793917d997df-dirty #6
> [ 1975.257144] Hardware name: Micro-Star International Co., Ltd. MS-7C35/MEG X570 UNIFY (MS-7C35), BIOS A.C3 03/15/2022
> [ 1975.257146] RIP: 0010:__filemap_get_folio (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/atomic.h:29 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1158 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1183 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-instrumented.h:608 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:238 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:247 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:280 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:313 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1899 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1951) 
> [ 1975.257152] Code: 10 e8 56 fd 67 00 48 89 c3 48 3d 02 04 00 00 74 e2 48 3d 06 04 00 00 74 da 48 85 c0 0f 84 3e 02 00 00 a8 01 0f 85 40 02 00 00 <8b> 40 34 85 c0 74 c2 8d 50 01 f0 0f b1 53 34 75 f2 48 8b 54 24 28
> All code
> ========
>    0:	10 e8                	adc    %ch,%al
>    2:	56                   	push   %rsi
>    3:	fd                   	std    
>    4:	67 00 48 89          	add    %cl,-0x77(%eax)
>    8:	c3                   	ret    
>    9:	48 3d 02 04 00 00    	cmp    $0x402,%rax
>    f:	74 e2                	je     0xfffffffffffffff3
>   11:	48 3d 06 04 00 00    	cmp    $0x406,%rax
>   17:	74 da                	je     0xfffffffffffffff3
>   19:	48 85 c0             	test   %rax,%rax
>   1c:	0f 84 3e 02 00 00    	je     0x260
>   22:	a8 01                	test   $0x1,%al
>   24:	0f 85 40 02 00 00    	jne    0x26a
>   2a:*	8b 40 34             	mov    0x34(%rax),%eax		<-- trapping instruction
>   2d:	85 c0                	test   %eax,%eax
>   2f:	74 c2                	je     0xfffffffffffffff3
>   31:	8d 50 01             	lea    0x1(%rax),%edx
>   34:	f0 0f b1 53 34       	lock cmpxchg %edx,0x34(%rbx)
>   39:	75 f2                	jne    0x2d
>   3b:	48 8b 54 24 28       	mov    0x28(%rsp),%rdx
> 
> Code starting with the faulting instruction
> ===========================================
>    0:	8b 40 34             	mov    0x34(%rax),%eax
>    3:	85 c0                	test   %eax,%eax
>    5:	74 c2                	je     0xffffffffffffffc9
>    7:	8d 50 01             	lea    0x1(%rax),%edx
>    a:	f0 0f b1 53 34       	lock cmpxchg %edx,0x34(%rbx)
>    f:	75 f2                	jne    0x3
>   11:	48 8b 54 24 28       	mov    0x28(%rsp),%rdx
> [ 1975.257154] RSP: 0000:ffffc2d744c37cb0 EFLAGS: 00010246
> [ 1975.257155] RAX: 0000000000000002 RBX: 0000000000000002 RCX: 0000000000000000
> [ 1975.257156] RDX: 0000000000000000 RSI: ffffffffbb117459 RDI: 00000000ffffffff
> [ 1975.257157] RBP: 0000000000000000 R08: 00000000ffffdfff R09: 00000000ffffdfff
> [ 1975.257158] R10: ffffffffbb472dc0 R11: ffffffffbb472dc0 R12: 0000000000000000
> [ 1975.257159] R13: ffff9fc521173e78 R14: 00000000000decc7 R15: fff000003fffffff
> [ 1975.257160] FS:  00007fb2137fe6c0(0000) GS:ffff9fcb7eb40000(0000) knlGS:0000000000000000
> [ 1975.257161] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 1975.257162] CR2: 0000000000000036 CR3: 0000000164114000 CR4: 0000000000750ee0
> [ 1975.257163] PKRU: 55555554
> [ 1975.257163] Call Trace:
> [ 1975.257164]  <TASK>
> [ 1975.257166] ? page_add_file_rmap (/home/reinhardt/dev-apps/kernel/linux/./include/linux/page-flags.h:195 /home/reinhardt/dev-apps/kernel/linux/mm/internal.h:440 /home/reinhardt/dev-apps/kernel/linux/mm/rmap.c:1270) 
> [ 1975.257169] filemap_fault (/home/reinhardt/dev-apps/kernel/linux/./include/linux/pagemap.h:531 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:3107) 
> [ 1975.257172] __do_fault (/home/reinhardt/dev-apps/kernel/linux/mm/memory.c:3852) 
> [ 1975.257174] __handle_mm_fault (/home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4169 /home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4297 /home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4555 /home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4690) 
> [ 1975.257176] handle_mm_fault (/home/reinhardt/dev-apps/kernel/linux/mm/memory.c:4788) 
> [ 1975.257178] do_user_addr_fault (/home/reinhardt/dev-apps/kernel/linux/./include/linux/sched/signal.h:404 /home/reinhardt/dev-apps/kernel/linux/arch/x86/mm/fault.c:1399) 
> [ 1975.257181] exc_page_fault (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/irqflags.h:40 /home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/irqflags.h:75 /home/reinhardt/dev-apps/kernel/linux/arch/x86/mm/fault.c:1492 /home/reinhardt/dev-apps/kernel/linux/arch/x86/mm/fault.c:1540) 
> [ 1975.257184] ? asm_exc_page_fault (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/idtentry.h:568) 
> [ 1975.257186] asm_exc_page_fault (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/idtentry.h:568) 
> [ 1975.257188] RIP: 0033:0x7fb265b88409
> [ 1975.257189] Code: 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 83 fa 20 72 27 <c5> fe 6f 06 48 83 fa 40 0f 87 a9 00 00 00 c5 fe 6f 4c 16 e0 c5 fe
> All code
> ========
>    0:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
>    7:	00 00 00 00 
>    b:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
>   12:	00 00 00 00 
>   16:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
>   1d:	00 00 00 00 
>   21:	48 89 f8             	mov    %rdi,%rax
>   24:	48 83 fa 20          	cmp    $0x20,%rdx
>   28:	72 27                	jb     0x51
>   2a:*	c5 fe 6f 06          	vmovdqu (%rsi),%ymm0		<-- trapping instruction
>   2e:	48 83 fa 40          	cmp    $0x40,%rdx
>   32:	0f 87 a9 00 00 00    	ja     0xe1
>   38:	c5 fe 6f 4c 16 e0    	vmovdqu -0x20(%rsi,%rdx,1),%ymm1
>   3e:	c5                   	.byte 0xc5
>   3f:	fe                   	.byte 0xfe
> 
> Code starting with the faulting instruction
> ===========================================
>    0:	c5 fe 6f 06          	vmovdqu (%rsi),%ymm0
>    4:	48 83 fa 40          	cmp    $0x40,%rdx
>    8:	0f 87 a9 00 00 00    	ja     0xb7
>    e:	c5 fe 6f 4c 16 e0    	vmovdqu -0x20(%rsi,%rdx,1),%ymm1
>   14:	c5                   	.byte 0xc5
>   15:	fe                   	.byte 0xfe
> [ 1975.257190] RSP: 002b:00007fb2137fd908 EFLAGS: 00010202
> [ 1975.257191] RAX: 00007fb204012a80 RBX: 0000000000000000 RCX: 00007fb2137fda90
> [ 1975.257192] RDX: 0000000000004000 RSI: 00007f9fddbb51c3 RDI: 00007fb204012a80
> [ 1975.257193] RBP: 00007fb2137fd928 R08: 00000000638ea1ab R09: 0000000000000000
> [ 1975.257193] R10: 0000000000000008 R11: 0000000000000246 R12: 00007fb204000bb0
> [ 1975.257194] R13: 00007fb21809a5a0 R14: 00000000decc71c3 R15: 0000000000004000
> [ 1975.257196]  </TASK>
> [ 1975.257196] Modules linked in: overlay xt_addrtype amdgpu drm_ttm_helper ttm gpu_sched drm_kms_helper iwlmvm backlight syscopyarea mac80211 sysfillrect sysimgblt libarc4 fb_sys_fops iwlwifi cfg80211 i2c_piix4 k10temp fuse configfs efivarfs
> [ 1975.257207] CR2: 0000000000000036
> [ 1975.257208] ---[ end trace 0000000000000000 ]---
> [ 1975.257209] RIP: 0010:__filemap_get_folio (/home/reinhardt/dev-apps/kernel/linux/./arch/x86/include/asm/atomic.h:29 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1158 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-arch-fallback.h:1183 /home/reinhardt/dev-apps/kernel/linux/./include/linux/atomic/atomic-instrumented.h:608 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:238 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:247 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:280 /home/reinhardt/dev-apps/kernel/linux/./include/linux/page_ref.h:313 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1899 /home/reinhardt/dev-apps/kernel/linux/mm/filemap.c:1951) 
> [ 1975.257211] Code: 10 e8 56 fd 67 00 48 89 c3 48 3d 02 04 00 00 74 e2 48 3d 06 04 00 00 74 da 48 85 c0 0f 84 3e 02 00 00 a8 01 0f 85 40 02 00 00 <8b> 40 34 85 c0 74 c2 8d 50 01 f0 0f b1 53 34 75 f2 48 8b 54 24 28
> All code
> ========
>    0:	10 e8                	adc    %ch,%al
>    2:	56                   	push   %rsi
>    3:	fd                   	std    
>    4:	67 00 48 89          	add    %cl,-0x77(%eax)
>    8:	c3                   	ret    
>    9:	48 3d 02 04 00 00    	cmp    $0x402,%rax
>    f:	74 e2                	je     0xfffffffffffffff3
>   11:	48 3d 06 04 00 00    	cmp    $0x406,%rax
>   17:	74 da                	je     0xfffffffffffffff3
>   19:	48 85 c0             	test   %rax,%rax
>   1c:	0f 84 3e 02 00 00    	je     0x260
>   22:	a8 01                	test   $0x1,%al
>   24:	0f 85 40 02 00 00    	jne    0x26a
>   2a:*	8b 40 34             	mov    0x34(%rax),%eax		<-- trapping instruction
>   2d:	85 c0                	test   %eax,%eax
>   2f:	74 c2                	je     0xfffffffffffffff3
>   31:	8d 50 01             	lea    0x1(%rax),%edx
>   34:	f0 0f b1 53 34       	lock cmpxchg %edx,0x34(%rbx)
>   39:	75 f2                	jne    0x2d
>   3b:	48 8b 54 24 28       	mov    0x28(%rsp),%rdx
> 
> Code starting with the faulting instruction
> ===========================================
>    0:	8b 40 34             	mov    0x34(%rax),%eax
>    3:	85 c0                	test   %eax,%eax
>    5:	74 c2                	je     0xffffffffffffffc9
>    7:	8d 50 01             	lea    0x1(%rax),%edx
>    a:	f0 0f b1 53 34       	lock cmpxchg %edx,0x34(%rbx)
>    f:	75 f2                	jne    0x3
>   11:	48 8b 54 24 28       	mov    0x28(%rsp),%rdx
> [ 1975.257212] RSP: 0000:ffffc2d744c37cb0 EFLAGS: 00010246
> [ 1975.257213] RAX: 0000000000000002 RBX: 0000000000000002 RCX: 0000000000000000
> [ 1975.257214] RDX: 0000000000000000 RSI: ffffffffbb117459 RDI: 00000000ffffffff
> [ 1975.257215] RBP: 0000000000000000 R08: 00000000ffffdfff R09: 00000000ffffdfff
> [ 1975.257215] R10: ffffffffbb472dc0 R11: ffffffffbb472dc0 R12: 0000000000000000
> [ 1975.257216] R13: ffff9fc521173e78 R14: 00000000000decc7 R15: fff000003fffffff
> [ 1975.257217] FS:  00007fb2137fe6c0(0000) GS:ffff9fcb7eb40000(0000) knlGS:0000000000000000
> [ 1975.257218] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 1975.257219] CR2: 0000000000000036 CR3: 0000000164114000 CR4: 0000000000750ee0
> [ 1975.257220] PKRU: 55555554
> 
> (full dmesg and my local changeset in attachments for your reference)
> 

#regzbot poke




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