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[94.113.247.30]) by smtp.gmail.com with ESMTPSA id vx4-20020a170907a78400b00a2d62a515e8sm529656ejc.212.2024.01.13.14.42.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 13 Jan 2024 14:42:34 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Sat, 13 Jan 2024 23:42:32 +0100 To: Ryan Roberts Cc: Andrew Morton , Matthew Wilcox , Yin Fengwei , David Hildenbrand , Yu Zhao , Catalin Marinas , Anshuman Khandual , Yang Shi , "Huang, Ying" , Zi Yan , Luis Chamberlain , Itaru Kitayama , "Kirill A. Shutemov" , John Hubbard , David Rientjes , Vlastimil Babka , Hugh Dickins , Kefeng Wang , Barry Song <21cnbao@gmail.com>, Alistair Popple , linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Barry Song Subject: Re: [PATCH v9 02/10] mm: Non-pmd-mappable, large folios for folio_add_new_anon_rmap() Message-ID: References: <20231207161211.2374093-1-ryan.roberts@arm.com> <20231207161211.2374093-3-ryan.roberts@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231207161211.2374093-3-ryan.roberts@arm.com> X-Rspamd-Queue-Id: EF9B5A000D X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: qbnyr96xueg4sb6ymfn5ohf4xu7s58ih X-HE-Tag: 1705185756-865649 X-HE-Meta: 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 GUIFDLvA 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Dec 07, 2023 at 04:12:03PM +0000, Ryan Roberts wrote: > In preparation for supporting anonymous multi-size THP, improve > folio_add_new_anon_rmap() to allow a non-pmd-mappable, large folio to be > passed to it. In this case, all contained pages are accounted using the > order-0 folio (or base page) scheme. > > Reviewed-by: Yu Zhao > Reviewed-by: Yin Fengwei > Reviewed-by: David Hildenbrand > Reviewed-by: Barry Song > Tested-by: Kefeng Wang > Tested-by: John Hubbard > Signed-off-by: Ryan Roberts > --- > mm/rmap.c | 28 ++++++++++++++++++++-------- > 1 file changed, 20 insertions(+), 8 deletions(-) > > diff --git a/mm/rmap.c b/mm/rmap.c > index 2a1e45e6419f..846fc79f3ca9 100644 > --- a/mm/rmap.c > +++ b/mm/rmap.c > @@ -1335,32 +1335,44 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma, > * This means the inc-and-test can be bypassed. > * The folio does not have to be locked. > * > - * If the folio is large, it is accounted as a THP. As the folio > + * If the folio is pmd-mappable, it is accounted as a THP. As the folio > * is new, it's assumed to be mapped exclusively by a single process. > */ > void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, > unsigned long address) > { > - int nr; > + int nr = folio_nr_pages(folio); > > - VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); > + VM_BUG_ON_VMA(address < vma->vm_start || > + address + (nr << PAGE_SHIFT) > vma->vm_end, vma); hi, I'm hitting this bug (console output below) with adding uprobe on simple program like: $ cat up.c int main(void) { return 0; } # bpftrace -e 'uprobe:/home/jolsa/up:_start {}' $ ./up it's on top of current linus tree master: 052d534373b7 Merge tag 'exfat-for-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/exfat before this patch it seems to work, I can send my .config if needed thanks, jirka --- [ 147.562264][ T719] vma ffff888166134e68 start 0000000000401000 end 0000000000402000 mm ffff88817cf2a840 [ 147.562264][ T719] prot 25 anon_vma ffff88817b6818e0 vm_ops ffffffff83475ec0 [ 147.562264][ T719] pgoff 1 file ffff888168d01240 private_data 0000000000000000 [ 147.562264][ T719] flags: 0x75(read|exec|mayread|maywrite|mayexec) [ 147.571660][ T719] ------------[ cut here ]------------ [ 147.572319][ T719] kernel BUG at mm/rmap.c:1412! [ 147.572825][ T719] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN NOPTI [ 147.573792][ T719] CPU: 3 PID: 719 Comm: up Not tainted 6.7.0+ #273 faf755a6fc44b54f4ff1c207411fbd9df5a3968d [ 147.574831][ T719] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 [ 147.575652][ T719] RIP: 0010:folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.576164][ T719] Code: c7 c6 20 d2 38 83 48 89 df e8 c0 4a fb ff 0f 0b 48 89 ef e8 16 ab 08 00 4c 3b 65 00 0f 83 cd fd ff ff 48 89 ef e8 34 44 fb ff f7 c3 ff 0f 00 00 0f 85 de fe ff ff be 08 00 00 00 48 89 df [ 147.577609][ T719] RSP: 0018:ffff88815759f568 EFLAGS: 00010286 [ 147.578140][ T719] RAX: 00000000000000fa RBX: ffffea00053eef40 RCX: 0000000000000000 [ 147.578825][ T719] RDX: 0000000000000000 RSI: ffffffff81289b44 RDI: ffffffff872ff1a0 [ 147.579513][ T719] RBP: ffff888166134e68 R08: 0000000000000001 R09: ffffed102aeb3e5f [ 147.580198][ T719] R10: ffff88815759f2ff R11: 0000000000000000 R12: 0000000000401020 [ 147.580886][ T719] R13: 0000000000000001 R14: ffffea00053eef40 R15: ffffea00053eef40 [ 147.581566][ T719] FS: 0000000000000000(0000) GS:ffff88842ce00000(0000) knlGS:0000000000000000 [ 147.582263][ T719] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 147.582724][ T719] CR2: 00005634f0ffe880 CR3: 000000010c0f8002 CR4: 0000000000770ef0 [ 147.583304][ T719] PKRU: 55555554 [ 147.583586][ T719] Call Trace: [ 147.583869][ T719] [ 147.584122][ T719] ? die+0x32/0x80 [ 147.584422][ T719] ? do_trap+0x12f/0x220 [ 147.584800][ T719] ? folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.585411][ T719] ? folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.585891][ T719] ? do_error_trap+0xa7/0x160 [ 147.586349][ T719] ? folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.586879][ T719] ? handle_invalid_op+0x2c/0x40 [ 147.587354][ T719] ? folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.587892][ T719] ? exc_invalid_op+0x29/0x40 [ 147.588352][ T719] ? asm_exc_invalid_op+0x16/0x20 [ 147.588847][ T719] ? preempt_count_sub+0x14/0xc0 [ 147.589335][ T719] ? folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.589899][ T719] ? folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.590437][ T719] __replace_page+0x364/0xb40 [ 147.590918][ T719] ? __pfx___replace_page+0x10/0x10 [ 147.591412][ T719] ? __pfx_lock_release+0x10/0x10 [ 147.591910][ T719] ? do_raw_spin_trylock+0xcd/0x120 [ 147.592555][ T719] ? __pfx_vma_alloc_folio+0x10/0x10 [ 147.593095][ T719] ? preempt_count_add+0x6e/0xc0 [ 147.593612][ T719] ? preempt_count_sub+0x14/0xc0 [ 147.594143][ T719] uprobe_write_opcode+0x3f6/0x820 [ 147.594616][ T719] ? __pfx_uprobe_write_opcode+0x10/0x10 [ 147.595125][ T719] ? preempt_count_sub+0x14/0xc0 [ 147.595551][ T719] ? up_write+0x125/0x2f0 [ 147.596014][ T719] install_breakpoint.isra.0+0xe5/0x470 [ 147.596635][ T719] uprobe_mmap+0x37b/0x8d0 [ 147.598111][ T719] ? __pfx_uprobe_mmap+0x10/0x10 [ 147.598561][ T719] mmap_region+0xa02/0x1220 [ 147.599013][ T719] ? rcu_is_watching+0x34/0x60 [ 147.599602][ T719] ? lock_acquired+0xbf/0x670 [ 147.600024][ T719] ? __pfx_mmap_region+0x10/0x10 [ 147.600458][ T719] ? security_mmap_addr+0x20/0x60 [ 147.600909][ T719] ? get_unmapped_area+0x169/0x1f0 [ 147.601353][ T719] do_mmap+0x425/0x660 [ 147.601739][ T719] vm_mmap_pgoff+0x15e/0x2b0 [ 147.602156][ T719] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 147.602597][ T719] ? __pfx_get_random_u64+0x10/0x10 [ 147.603059][ T719] elf_load+0xdc/0x3a0 [ 147.603433][ T719] load_elf_binary+0x6f6/0x22b0 [ 147.603889][ T719] ? __pfx_load_elf_binary+0x10/0x10 [ 147.604385][ T719] ? __pfx_lock_acquired+0x10/0x10 [ 147.604952][ T719] bprm_execve+0x494/0xc80 [ 147.605379][ T719] ? __pfx_bprm_execve+0x10/0x10 [ 147.605843][ T719] do_execveat_common.isra.0+0x24f/0x330 [ 147.606358][ T719] __x64_sys_execve+0x52/0x60 [ 147.606797][ T719] do_syscall_64+0x87/0x1b0 [ 147.607148][ T719] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 147.607630][ T719] RIP: 0033:0x7faa9b0bdb4b [ 147.608732][ T719] Code: Unable to access opcode bytes at 0x7faa9b0bdb21. [ 147.609318][ T719] RSP: 002b:00007ffff9921708 EFLAGS: 00000246 ORIG_RAX: 000000000000003b [ 147.610046][ T719] RAX: ffffffffffffffda RBX: 00005634f1964990 RCX: 00007faa9b0bdb4b [ 147.610727][ T719] RDX: 00005634f1966d20 RSI: 00005634f19612c0 RDI: 00005634f1964990 [ 147.611528][ T719] RBP: 00007ffff9921800 R08: 0000000000000001 R09: 0000000000000001 [ 147.612192][ T719] R10: 0000000000000008 R11: 0000000000000246 R12: 00000000ffffffff [ 147.612829][ T719] R13: 00005634f1964990 R14: 00005634f19612c0 R15: 00005634f1966d20 [ 147.613479][ T719] [ 147.613787][ T719] Modules linked in: intel_rapl_msr intel_rapl_common crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel kvm_intel rapl iTiTCO_vendor_support i2c_i801 i2c_smbus lpc_ich drm loop drm_panel_orientation_quirks zram [ 147.615630][ T719] ---[ end trace 0000000000000000 ]--- [ 147.616253][ T719] RIP: 0010:folio_add_new_anon_rmap+0x2cc/0x8f0 [ 147.616714][ T719] Code: c7 c6 20 d2 38 83 48 89 df e8 c0 4a fb ff 0f 0b 48 89 ef e8 16 ab 08 00 4c 3b 65 00 0f 83 cd fd ff ff 48 89 ef e8 34 44 fb ff f7 c3 ff 0f 00 00 0f 85 de fe ff ff be 08 00 00 00 48 89 df [ 147.618160][ T719] RSP: 0018:ffff88815759f568 EFLAGS: 00010286 [ 147.618594][ T719] RAX: 00000000000000fa RBX: ffffea00053eef40 RCX: 0000000000000000 [ 147.619318][ T719] RDX: 0000000000000000 RSI: ffffffff81289b44 RDI: ffffffff872ff1a0 [ 147.619930][ T719] RBP: ffff888166134e68 R08: 0000000000000001 R09: ffffed102aeb3e5f [ 147.620577][ T719] R10: ffff88815759f2ff R11: 0000000000000000 R12: 0000000000401020 [ 147.621236][ T719] R13: 0000000000000001 R14: ffffea00053eef40 R15: ffffea00053eef40 [ 147.621894][ T719] FS: 0000000000000000(0000) GS:ffff88842ce00000(0000) knlGS:0000000000000000 [ 147.622596][ T719] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 147.623186][ T719] CR2: 00007faa9b0bdb21 CR3: 000000010c0f8002 CR4: 0000000000770ef0 [ 147.623960][ T719] PKRU: 55555554 [ 147.624331][ T719] note: up[719] exited with preempt_count 1 [ 147.624953][ T719] BUG: sleeping function called from invalid context at include/linux/percpu-rwsem.h:49 [ 147.625898][ T719] in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 719, name: up [ 147.626672][ T719] preempt_count: 0, expected: 0 [ 147.627945][ T719] RCU nest depth: 1, expected: 0 [ 147.628410][ T719] INFO: lockdep is turned off. [ 147.628898][ T719] CPU: 3 PID: 719 Comm: up Tainted: G D 6.7.0+ #273 faf755a6fc44b54f4ff1c207411fbd9df5a3968d [ 147.629954][ T719] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 [ 147.630838][ T719] Call Trace: [ 147.631185][ T719] [ 147.631514][ T719] dump_stack_lvl+0x15d/0x180 [ 147.631973][ T719] __might_resched+0x270/0x3b0 [ 147.636533][ T719] exit_signals+0x1d/0x460 [ 147.636947][ T719] do_exit+0x27f/0x13b0 [ 147.637368][ T719] ? __pfx__printk+0x10/0x10 [ 147.637827][ T719] ? __pfx_do_exit+0x10/0x10 [ 147.638238][ T719] make_task_dead+0xd9/0x240 [ 147.638610][ T719] rewind_stack_and_make_dead+0x17/0x20 [ 147.639064][ T719] RIP: 0033:0x7faa9b0bdb4b [ 147.639445][ T719] Code: Unable to access opcode bytes at 0x7faa9b0bdb21. [ 147.640015][ T719] RSP: 002b:00007ffff9921708 EFLAGS: 00000246 ORIG_RAX: 000000000000003b [ 147.640694][ T719] RAX: ffffffffffffffda RBX: 00005634f1964990 RCX: 00007faa9b0bdb4b [ 147.641407][ T719] RDX: 00005634f1966d20 RSI: 00005634f19612c0 RDI: 00005634f1964990 [ 147.642133][ T719] RBP: 00007ffff9921800 R08: 0000000000000001 R09: 0000000000000001 [ 147.642911][ T719] R10: 0000000000000008 R11: 0000000000000246 R12: 00000000ffffffff [ 147.643685][ T719] R13: 00005634f1964990 R14: 00005634f19612c0 R15: 00005634f1966d20 [ 147.644454][ T719] [ 147.644819][ T719] ------------[ cut here ]------------