Re: [linux-next:master] [mm] bbcbf2a3f0: kernel_BUG_at_mm/memory.c

From: Andrew Morton
Date: Wed Dec 20 2023 - 17:11:46 EST

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On Tue, 19 Dec 2023 23:46:50 +0800 kernel test robot <oliver.sang@xxxxxxxxx> wrote:

>
>
> Hello,
>
> kernel test robot noticed "kernel_BUG_at_mm/memory.c" on:
>
> commit: bbcbf2a3f05f74f9d268eab57abbdce6a65a94ad ("mm: convert ksm_might_need_to_copy() to work on folios")

I assume this is a bisection result, so it's quite repeatable?

> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
> [test failed on linux-next/master aa4db8324c4d0e67aa4670356df4e9fae14b4d37]
>
> in testcase: vm-scalability
> version: vm-scalability-x86_64-1.0-0_20220518
> with following parameters:
>
> runtime: 300
> thp_enabled: always
> thp_defrag: always
> nr_task: 32
> nr_ssd: 1
> priority: 1
> test: swap-w-rand
> cpufreq_governor: performance
>
> test-description: The motivation behind this suite is to exercise functions and regions of the mm/ of the Linux kernel which are of interest to us.
> test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/
>
>
> compiler: gcc-12
> test machine: 128 threads 2 sockets Intel(R) Xeon(R) Platinum 8358 CPU @ 2.60GHz (Ice Lake) with 128G memory
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
>
> 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/202312192319.fa8f5709-oliver.sang@xxxxxxxxx
>
>
> [ 61.404380][ T5947] ------------[ cut here ]------------
> [ 61.409984][ T5947] kernel BUG at mm/memory.c:3990!
> [ 61.415085][ T5947] invalid opcode: 0000 [#1] SMP NOPTI

This is

BUG_ON(folio_test_anon(folio) && PageAnonExclusive(page));

and I don't believe that the error path fix
(https://lkml.kernel.org/r/ZXnPtblC6A1IkyAB@xxxxxxxxxxxxxxxxxxxx) will
address this.

Matthew, have you had a chance to consider?

Thanks.

> [ 61.420506][ T5947] CPU: 32 PID: 5947 Comm: usemem Tainted: G S 6.7.0-rc4-00252-gbbcbf2a3f05f #1
> [ 61.430881][ T5947] Hardware name: Intel Corporation M50CYP2SB1U/M50CYP2SB1U, BIOS SE5C620.86B.01.01.0003.2104260124 04/26/2021
> [ 61.442761][ T5947] RIP: 0010:do_swap_page (mm/memory.c:3990 (discriminator 3))
> [ 61.448112][ T5947] Code: 6f 28 31 d2 be 01 00 00 00 4c 89 ff e8 9b 43 03 00 49 c7 47 28 00 00 00 00 4c 89 f9 48 c7 44 24 08 00 00 00 00 e9 cf fb ff ff <0f> 0b 49 8b 45 08 f0 48 83 28 01 0f 85 3f fc ff ff 49 8b 45 08 4c
> All code
> ========
> 0: 6f outsl %ds:(%rsi),(%dx)
> 1: 28 31 sub %dh,(%rcx)
> 3: d2 be 01 00 00 00 sarb %cl,0x1(%rsi)
> 9: 4c 89 ff mov %r15,%rdi
> c: e8 9b 43 03 00 call 0x343ac
> 11: 49 c7 47 28 00 00 00 movq $0x0,0x28(%r15)
> 18: 00
> 19: 4c 89 f9 mov %r15,%rcx
> 1c: 48 c7 44 24 08 00 00 movq $0x0,0x8(%rsp)
> 23: 00 00
> 25: e9 cf fb ff ff jmp 0xfffffffffffffbf9
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 49 8b 45 08 mov 0x8(%r13),%rax
> 30: f0 48 83 28 01 lock subq $0x1,(%rax)
> 35: 0f 85 3f fc ff ff jne 0xfffffffffffffc7a
> 3b: 49 8b 45 08 mov 0x8(%r13),%rax
> 3f: 4c rex.WR
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 49 8b 45 08 mov 0x8(%r13),%rax
> 6: f0 48 83 28 01 lock subq $0x1,(%rax)
> b: 0f 85 3f fc ff ff jne 0xfffffffffffffc50
> 11: 49 8b 45 08 mov 0x8(%r13),%rax
> 15: 4c rex.WR
> [ 61.468016][ T5947] RSP: 0000:ffa000000bb5fd98 EFLAGS: 00010206
> [ 61.474169][ T5947] RAX: ff11000111a47c99 RBX: ffa000000bb5fe08 RCX: 0000002064ac7000
> [ 61.482233][ T5947] RDX: 0057ffffc00a106d RSI: 0000000000000043 RDI: ffd400008192b1e8
> [ 61.490296][ T5947] RBP: 000000000100c13b R08: 0000000000000000 R09: ffa000000bb5fe08
> [ 61.498366][ T5947] R10: 0000000055555554 R11: ff1100018bebbd0c R12: ffd4000044128000
> [ 61.506438][ T5947] R13: ff1100205d33d800 R14: ff11000130cd2da8 R15: ffd4000044128000
> [ 61.514508][ T5947] FS: 00007f49c900c740(0000) GS:ff11002001000000(0000) knlGS:0000000000000000
> [ 61.523534][ T5947] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 61.530225][ T5947] CR2: 00007f4966b3b6b8 CR3: 00000010af786004 CR4: 0000000000771ef0
> [ 61.538307][ T5947] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 61.546387][ T5947] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 61.554471][ T5947] PKRU: 55555554
> [ 61.558137][ T5947] Call Trace:
> [ 61.561544][ T5947] <TASK>
> [ 61.564599][ T5947] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447)
> [ 61.568429][ T5947] ? do_trap (arch/x86/kernel/traps.c:112 arch/x86/kernel/traps.c:153)
> [ 61.572692][ T5947] ? do_swap_page (mm/memory.c:3990 (discriminator 3))
> [ 61.577475][ T5947] ? do_error_trap (arch/x86/include/asm/traps.h:59 arch/x86/kernel/traps.c:174)
> [ 61.582172][ T5947] ? do_swap_page (mm/memory.c:3990 (discriminator 3))
> [ 61.586966][ T5947] ? exc_invalid_op (arch/x86/kernel/traps.c:265)
> [ 61.591743][ T5947] ? do_swap_page (mm/memory.c:3990 (discriminator 3))
> [ 61.596515][ T5947] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:568)
> [ 61.601638][ T5947] ? do_swap_page (mm/memory.c:3990 (discriminator 3))
> [ 61.606412][ T5947] ? do_swap_page (mm/memory.c:3971)
> [ 61.611179][ T5947] __handle_mm_fault (mm/memory.c:5274)
> [ 61.616203][ T5947] handle_mm_fault (mm/memory.c:5439)
> [ 61.621051][ T5947] do_user_addr_fault (arch/x86/mm/fault.c:1365)
> [ 61.626151][ T5947] exc_page_fault (arch/x86/include/asm/irqflags.h:37 arch/x86/include/asm/irqflags.h:72 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1561)
> [ 61.630824][ T5947] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:570)
> [ 61.635748][ T5947] RIP: 0033:0x5612d5878ad6
> [ 61.640229][ T5947] Code: 01 00 00 00 e8 1b f9 ff ff 89 c7 e8 6c ff ff ff bf 00 00 00 00 e8 0a f9 ff ff 85 d2 74 08 48 8d 04 f7 48 8b 00 c3 48 8d 04 f7 <48> 89 30 b8 00 00 00 00 c3 41 54 55 53 48 85 ff 0f 84 21 01 00 00
> All code
> ========
> 0: 01 00 add %eax,(%rax)
> 2: 00 00 add %al,(%rax)
> 4: e8 1b f9 ff ff call 0xfffffffffffff924
> 9: 89 c7 mov %eax,%edi
> b: e8 6c ff ff ff call 0xffffffffffffff7c
> 10: bf 00 00 00 00 mov $0x0,%edi
> 15: e8 0a f9 ff ff call 0xfffffffffffff924
> 1a: 85 d2 test %edx,%edx
> 1c: 74 08 je 0x26
> 1e: 48 8d 04 f7 lea (%rdi,%rsi,8),%rax
> 22: 48 8b 00 mov (%rax),%rax
> 25: c3 ret
> 26: 48 8d 04 f7 lea (%rdi,%rsi,8),%rax
> 2a:* 48 89 30 mov %rsi,(%rax) <-- trapping instruction
> 2d: b8 00 00 00 00 mov $0x0,%eax
> 32: c3 ret
> 33: 41 54 push %r12
> 35: 55 push %rbp
> 36: 53 push %rbx
> 37: 48 85 ff test %rdi,%rdi
> 3a: 0f 84 21 01 00 00 je 0x161
>
> Code starting with the faulting instruction
> ===========================================
> 0: 48 89 30 mov %rsi,(%rax)
> 3: b8 00 00 00 00 mov $0x0,%eax
> 8: c3 ret
> 9: 41 54 push %r12
> b: 55 push %rbp
> c: 53 push %rbx
> d: 48 85 ff test %rdi,%rdi
> 10: 0f 84 21 01 00 00 je 0x137
> [ 61.660112][ T5947] RSP: 002b:00007ffd09f037d8 EFLAGS: 00010246
> [ 61.666250][ T5947] RAX: 00007f4966b3b6b8 RBX: 000000000000358f RCX: 00000005deece66d
> [ 61.674295][ T5947] RDX: 0000000000000000 RSI: 000000002fa0f0d7 RDI: 00007f47e9ac3000
> [ 61.682347][ T5947] RBP: 000000002fa0f0d7 R08: 00007ffd09f0386c R09: 0000000000000001
> [ 61.690401][ T5947] R10: 00007ffd09f037c0 R11: 0000000000000000 R12: 000000000001ac78
> [ 61.698449][ T5947] R13: 00007f47e9ac3000 R14: 00007ffd09f0386c R15: 00007ffd09f03970
> [ 61.706500][ T5947] </TASK>
> [ 61.709607][ T5947] Modules linked in: kmem xfs loop device_dax nd_pmem dax_pmem nd_btt btrfs blake2b_generic xor raid6_pq libcrc32c intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp coretemp sd_mod t10_pi crc64_rocksoft_generic crc64_rocksoft crc64 kvm_intel sg kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel sha512_ssse3 ahci ipmi_ssif rapl intel_cstate ast libahci mei_me drm_shmem_helper i2c_i801 ioatdma acpi_ipmi libata drm_kms_helper mei intel_uncore joydev i2c_smbus intel_pch_thermal dax_hmem dca wmi ipmi_si ipmi_devintf ipmi_msghandler nfit libnvdimm acpi_power_meter acpi_pad drm fuse ip_tables
> [ 61.768510][ T5947] ---[ end trace 0000000000000000 ]---
> [ 61.786010][ T5947] pstore: backend (erst) writing error (-28)
> [ 61.792055][ T5947] RIP: 0010:do_swap_page (mm/memory.c:3990 (discriminator 3))
> [ 61.797397][ T5947] Code: 6f 28 31 d2 be 01 00 00 00 4c 89 ff e8 9b 43 03 00 49 c7 47 28 00 00 00 00 4c 89 f9 48 c7 44 24 08 00 00 00 00 e9 cf fb ff ff <0f> 0b 49 8b 45 08 f0 48 83 28 01 0f 85 3f fc ff ff 49 8b 45 08 4c
> All code
> ========
> 0: 6f outsl %ds:(%rsi),(%dx)
> 1: 28 31 sub %dh,(%rcx)
> 3: d2 be 01 00 00 00 sarb %cl,0x1(%rsi)
> 9: 4c 89 ff mov %r15,%rdi
> c: e8 9b 43 03 00 call 0x343ac
> 11: 49 c7 47 28 00 00 00 movq $0x0,0x28(%r15)
> 18: 00
> 19: 4c 89 f9 mov %r15,%rcx
> 1c: 48 c7 44 24 08 00 00 movq $0x0,0x8(%rsp)
> 23: 00 00
> 25: e9 cf fb ff ff jmp 0xfffffffffffffbf9
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 49 8b 45 08 mov 0x8(%r13),%rax
> 30: f0 48 83 28 01 lock subq $0x1,(%rax)
> 35: 0f 85 3f fc ff ff jne 0xfffffffffffffc7a
> 3b: 49 8b 45 08 mov 0x8(%r13),%rax
> 3f: 4c rex.WR
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 49 8b 45 08 mov 0x8(%r13),%rax
> 6: f0 48 83 28 01 lock subq $0x1,(%rax)
> b: 0f 85 3f fc ff ff jne 0xfffffffffffffc50
> 11: 49 8b 45 08 mov 0x8(%r13),%rax
> 15: 4c rex.WR
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20231219/202312192319.fa8f5709-oliver.sang@xxxxxxxxx
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>

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In reply to: kernel test robot: "[linux-next:master] [mm] bbcbf2a3f0: kernel_BUG_at_mm/memory.c"
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