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b=qCULTCBAQW/1m75ioAeIj6eMRB Hmh/dl3krr+u4uirzh1dRe6sYEiP5d/5Hwlkej4+fEwvMYAAZB/tuEJKTZttEIAIGeMtfEL/NL76C P6nXwX0VKOohiQFOBpWGdK0bQsYKTB5MD+jrQSr2arJSTpnxcodmXKXgSsRGPKqvRjSU6UKpyno8K og3CyztmiJzABoizt64TZqOE/HfyQ3HQx24C5Kou+MJpPHf7jCWMpRhuy8LB7prBloaETFHo3AYZ9 14NXF+Sr/4ToiEYo7Kiz4ysxbPQ2gtU6Wd4CLaNYKwCN0AmAhEKq7+ixPpn4OWUJhUsUyc+pjw19m leq7f3TQ==; Received: from 39-12-18-146.adsl.fetnet.net ([39.12.18.146] helo=[192.168.238.43]) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_128_GCM:128) (Exim) id 1uFpSt-008yAE-Qb; Fri, 16 May 2025 09:32:42 +0200 Message-ID: Date: Fri, 16 May 2025 15:32:35 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/hugetlb: fix a deadlock with pagecache_folio and hugetlb_fault_mutex_table To: Byungchul Park Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, mike.kravetz@oracle.com, kernel-dev@igalia.com, stable@vger.kernel.org, Hugh Dickins , Florent Revest , Gavin Shan , kernel_team@skhynix.com References: <20250513093448.592150-1-gavinguo@igalia.com> <20250514064729.GA17622@system.software.com> <075ae729-1d4a-4f12-a2ba-b4f508e5d0a1@igalia.com> <20250516060309.GA51921@system.software.com> Content-Language: en-US From: Gavin Guo In-Reply-To: <20250516060309.GA51921@system.software.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: EB367A0007 X-Stat-Signature: uwfgsjaco6kkc5crb9zyfjic7dm87xng X-HE-Tag: 1747380771-34822 X-HE-Meta: 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 SOAbDpE9 lcaft/uZ/7th4UnfztB7qM9xsLVuCvBrLe60nthqynf8r9tA1kp48xGh4X3XUxq4Gmkg9LqbE8DmTQOfYqi4gzSlda//WumeoM0xnLaSyAeZ9R5XudiZdo7srpK+p7yImyAkAi6esTIJFOx71SfMyCVMbfJObdQ6TAorExIJvx0h38PntDutEQ/IOs8oqLLDWhheUIKHXKqDsmi4VNIWrJ3kIgR8IU85/aDGXHSyg0FRxBrvpEzH3OYyauJff0jl7+qf12BSXZFGq8WCsl9k4tLYNDS4OUEL/q2qBgz13tP9eK0LJkVMsSPj1G7SxmTHPyvJZVqDY1Ya64Md5tDV8bZApD3S5hHDKpSyxn3c8TtOoNY2kU3v2G3AnCtE7Kuc9vgZlKiMMrUYeRRj7kyikrNqLUuleHdkCjwMiGLg2tIvo6eEYiMH9x6C0vH8pkEevVMZE 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 5/16/25 14:03, Byungchul Park wrote: > On Wed, May 14, 2025 at 04:10:12PM +0800, Gavin Guo wrote: >> Hi Byungchul, >> >> On 5/14/25 14:47, Byungchul Park wrote: >>> On Tue, May 13, 2025 at 05:34:48PM +0800, Gavin Guo wrote: >>>> The patch fixes a deadlock which can be triggered by an internal >>>> syzkaller [1] reproducer and captured by bpftrace script [2] and its log >>> >>> Hi, >>> >>> I'm trying to reproduce using the test program [1]. But not yet >>> produced. I see a lot of segfaults while running [1]. I guess >>> something goes wrong. Is there any prerequisite condition to reproduce >>> it? Lemme know if any. Or can you try DEPT15 with your config and >>> environment by the following steps: >>> >>> 1. Apply the patchset on v6.15-rc6. >>> https://lkml.kernel.org/r/20250513100730.12664-1-byungchul@sk.com >>> 2. Turn on CONFIG_DEPT. >>> 3. Run test program reproducing the deadlock. >>> 4. Check dmesg to see if dept reported the dependency. >>> >>> Byungchul >> >> I have enabled the patchset and successfully reproduced the bug. It >> seems that there is no warning or error log related to the lock. Did I >> miss anything? This is the console log: >> https://drive.google.com/file/d/1dxWNiO71qE-H-e5NMPqj7W-aW5CkGSSF/view?usp=sharing > > My bad. I think I found the problem that dept didn't report it. You > might see the report with the following patch applied on the top, there > might be a lot of false positives along with that might be annoying tho. > > Some of my efforts to suppress false positives, suppressed the real one. > > Do you mind if I ask you to run the test with the following patch > applied? It'd be appreciated if you do and share the result with me. > > Byungchul > > --- > diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h > index f31cd68f2935..fd7559e663c5 100644 > --- a/include/linux/pagemap.h > +++ b/include/linux/pagemap.h > @@ -1138,6 +1138,7 @@ static inline bool trylock_page(struct page *page) > static inline void folio_lock(struct folio *folio) > { > might_sleep(); > + dept_page_wait_on_bit(&folio->page, PG_locked); > if (!folio_trylock(folio)) > __folio_lock(folio); > } > diff --git a/kernel/dependency/dept.c b/kernel/dependency/dept.c > index b2fa96d984bc..4e96a6a72d02 100644 > --- a/kernel/dependency/dept.c > +++ b/kernel/dependency/dept.c > @@ -931,7 +931,6 @@ static void print_circle(struct dept_class *c) > dept_outworld_exit(); > > do { > - tc->reported = true; > tc = fc; > fc = fc->bfs_parent; > } while (tc != c); > diff --git a/kernel/dependency/dept_unit_test.c b/kernel/dependency/dept_unit_test.c > index 88e846b9f876..496149f31fb3 100644 > --- a/kernel/dependency/dept_unit_test.c > +++ b/kernel/dependency/dept_unit_test.c > @@ -125,6 +125,8 @@ static int __init dept_ut_init(void) > { > int i; > > + return 0; > + > lockdep_off(); > > dept_ut_results.ecxt_stack_valid_cnt = 0; > -- Please see the test result: https://drive.google.com/file/d/1B20Gu3wLFbAeaXXb7aSQP5T6aeN9Mext/view?usp=sharing It seems that after the first round, the deadlock is captured: ubuntu@localhost:~$ ./repro_20250402_0225_154f8fb0580000 executing program [ 80.425842][ T3416] =================================================== [ 80.426707][ T3416] DEPT: Circular dependency has been detected. [ 80.427497][ T3416] 6.15.0-rc6+ #31 Not tainted [ 80.428084][ T3416] --------------------------------------------------- [ 80.428964][ T3416] summary [ 80.429330][ T3416] --------------------------------------------------- [ 80.430078][ T3416] *** DEADLOCK *** [ 80.430078][ T3416] [ 80.430736][ T3416] context A [ 80.431076][ T3416] [S] (unknown)(pg_locked_map:0) [ 80.431637][ T3416] [W] lock(&hugetlb_fault_mutex_table[i]:0) [ 80.432312][ T3416] [E] dept_page_clear_bit(pg_locked_map:0) [ 80.432977][ T3416] [ 80.433246][ T3416] context B [ 80.433595][ T3416] [S] lock(&hugetlb_fault_mutex_table[i]:0) [ 80.434245][ T3416] [W] dept_page_wait_on_bit(pg_locked_map:0) [ 80.434880][ T3416] [E] unlock(&hugetlb_fault_mutex_table[i]:0) [ 80.435592][ T3416] [ 80.435852][ T3416] [S]: start of the event context [ 80.436369][ T3416] [W]: the wait blocked [ 80.436789][ T3416] [E]: the event not reachable [ 80.437275][ T3416] --------------------------------------------------- [ 80.437950][ T3416] context A's detail [ 80.438367][ T3416] --------------------------------------------------- [ 80.439006][ T3416] context A [ 80.439337][ T3416] [S] (unknown)(pg_locked_map:0) [ 80.439883][ T3416] [W] lock(&hugetlb_fault_mutex_table[i]:0) [ 80.440489][ T3416] [E] dept_page_clear_bit(pg_locked_map:0) [ 80.441075][ T3416] [ 80.441318][ T3416] [S] (unknown)(pg_locked_map:0): [ 80.441816][ T3416] (N/A) [ 80.442077][ T3416] [ 80.442309][ T3416] [W] lock(&hugetlb_fault_mutex_table[i]:0): [ 80.442872][ T3416] [] hugetlb_wp+0xfa4/0x3490 [ 80.443502][ T3416] stacktrace: [ 80.443810][ T3416] hugetlb_wp+0xfa4/0x3490 [ 80.444267][ T3416] hugetlb_fault+0x1505/0x2c70 [ 80.444776][ T3416] handle_mm_fault+0x1845/0x1ab0 [ 80.445275][ T3416] do_user_addr_fault+0x637/0x1450 [ 80.445779][ T3416] exc_page_fault+0x67/0x110 [ 80.446239][ T3416] asm_exc_page_fault+0x26/0x30 [ 80.446722][ T3416] __put_user_4+0xd/0x20 [ 80.447157][ T3416] copy_process+0x1f64/0x3d80 [ 80.447621][ T3416] kernel_clone+0x216/0x940 [ 80.448068][ T3416] __x64_sys_clone+0x18d/0x1f0 [ 80.448548][ T3416] do_syscall_64+0x6f/0x120 [ 80.448999][ T3416] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 80.449556][ T3416] [ 80.449765][ T3416] [E] dept_page_clear_bit(pg_locked_map:0): [ 80.450272][ T3416] [] hugetlb_fault+0x1ccb/0x2c70 [ 80.450861][ T3416] stacktrace: [ 80.451148][ T3416] hugetlb_fault+0x1ccb/0x2c70 [ 80.451611][ T3416] handle_mm_fault+0x1845/0x1ab0 [ 80.452080][ T3416] do_user_addr_fault+0x637/0x1450 [ 80.452566][ T3416] exc_page_fault+0x67/0x110 [ 80.453014][ T3416] asm_exc_page_fault+0x26/0x30 [ 80.453497][ T3416] __put_user_4+0xd/0x20 [ 80.453923][ T3416] copy_process+0x1f64/0x3d80 [ 80.454379][ T3416] kernel_clone+0x216/0x940 [ 80.454817][ T3416] __x64_sys_clone+0x18d/0x1f0 [ 80.455277][ T3416] do_syscall_64+0x6f/0x120 [ 80.455722][ T3416] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 80.456253][ T3416] --------------------------------------------------- [ 80.456842][ T3416] context B's detail [ 80.457198][ T3416] --------------------------------------------------- [ 80.457842][ T3416] context B [ 80.458122][ T3416] [S] lock(&hugetlb_fault_mutex_table[i]:0) [ 80.458661][ T3416] [W] dept_page_wait_on_bit(pg_locked_map:0) [ 80.459187][ T3416] [E] unlock(&hugetlb_fault_mutex_table[i]:0) [ 80.459763][ T3416] [ 80.459988][ T3416] [S] lock(&hugetlb_fault_mutex_table[i]:0): [ 80.460509][ T3416] [] hugetlb_fault+0x3c6/0x2c70 [ 80.461074][ T3416] stacktrace: [ 80.461374][ T3416] hugetlb_fault+0x3c6/0x2c70 [ 80.461812][ T3416] handle_mm_fault+0x1845/0x1ab0 [ 80.462281][ T3416] do_user_addr_fault+0x637/0x1450 [ 80.462775][ T3416] exc_page_fault+0x67/0x110 [ 80.463220][ T3416] asm_exc_page_fault+0x26/0x30 [ 80.463694][ T3416] __put_user_4+0xd/0x20 [ 80.464129][ T3416] copy_process+0x1f64/0x3d80 [ 80.464577][ T3416] kernel_clone+0x216/0x940 [ 80.464994][ T3416] __x64_sys_clone+0x18d/0x1f0 [ 80.465466][ T3416] do_syscall_64+0x6f/0x120 [ 80.465909][ T3416] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 80.466457][ T3416] [ 80.466660][ T3416] [W] dept_page_wait_on_bit(pg_locked_map:0): [ 80.467177][ T3416] [] hugetlb_fault+0x817/0x2c70 [ 80.467740][ T3416] stacktrace: [ 80.468032][ T3416] hugetlb_fault+0x817/0x2c70 [ 80.468479][ T3416] handle_mm_fault+0x1845/0x1ab0 [ 80.468947][ T3416] do_user_addr_fault+0x637/0x1450 [ 80.469428][ T3416] exc_page_fault+0x67/0x110 [ 80.469865][ T3416] asm_exc_page_fault+0x26/0x30 [ 80.470332][ T3416] __put_user_4+0xd/0x20 [ 80.470742][ T3416] copy_process+0x1f64/0x3d80 [ 80.471186][ T3416] kernel_clone+0x216/0x940 [ 80.471616][ T3416] __x64_sys_clone+0x18d/0x1f0 [ 80.472060][ T3416] do_syscall_64+0x6f/0x120 [ 80.472492][ T3416] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 80.473040][ T3416] [ 80.473271][ T3416] [E] unlock(&hugetlb_fault_mutex_table[i]:0): [ 80.473863][ T3416] (N/A) [ 80.474124][ T3416] --------------------------------------------------- [ 80.474738][ T3416] information that might be helpful [ 80.475210][ T3416] --------------------------------------------------- [ 80.475820][ T3416] CPU: 1 UID: 1000 PID: 3416 Comm: repro_20250402_ Not tainted 6.15.0-rc6+ #31 NONE [ 80.475831][ T3416] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 80.475837][ T3416] Call Trace: [ 80.475841][ T3416] [ 80.475845][ T3416] dump_stack_lvl+0x1ad/0x280 [ 80.475858][ T3416] ? __pfx_dump_stack_lvl+0x10/0x10 [ 80.475867][ T3416] ? __pfx__printk+0x10/0x10 [ 80.475883][ T3416] cb_check_dl+0x24a8/0x2530 [ 80.475897][ T3416] ? bfs_extend_dep+0x271/0x290 [ 80.475909][ T3416] bfs+0x464/0x5e0 [ 80.475921][ T3416] ? __pfx_bfs+0x10/0x10 [ 80.475931][ T3416] ? add_dep+0x387/0x710 [ 80.475943][ T3416] add_dep+0x3d0/0x710 [ 80.475953][ T3416] ? __pfx_from_pool+0x10/0x10 [ 80.475963][ T3416] ? __pfx_bfs_init_check_dl+0x10/0x10 [ 80.475972][ T3416] ? __pfx_bfs_extend_dep+0x10/0x10 [ 80.475981][ T3416] ? __pfx_bfs_dequeue_dep+0x10/0x10 [ 80.475990][ T3416] ? __pfx_cb_check_dl+0x10/0x10 [ 80.475999][ T3416] ? __pfx_add_dep+0x10/0x10 [ 80.476011][ T3416] ? put_ecxt+0xda/0x4b0 [ 80.476024][ T3416] __dept_event+0xee8/0x1590 [ 80.476038][ T3416] dept_event+0x166/0x240 [ 80.476047][ T3416] ? hugetlb_fault+0x1ccb/0x2c70 [ 80.476057][ T3416] folio_unlock+0xb8/0x190 [ 80.476071][ T3416] hugetlb_fault+0x1ccb/0x2c70 [ 80.476085][ T3416] ? __pfx_hugetlb_fault+0x10/0x10 [ 80.476100][ T3416] ? mt_find+0x15a/0x5f0 [ 80.476110][ T3416] handle_mm_fault+0x1845/0x1ab0 [ 80.476125][ T3416] ? handle_mm_fault+0xdb/0x1ab0 [ 80.476142][ T3416] ? __pfx_handle_mm_fault+0x10/0x10 [ 80.476156][ T3416] ? find_vma+0xec/0x160 [ 80.476164][ T3416] ? __pfx_find_vma+0x10/0x10 [ 80.476172][ T3416] ? dept_on+0x1c/0x30 [ 80.476179][ T3416] ? dept_exit+0x1c5/0x2c0 [ 80.476186][ T3416] ? lockdep_hardirqs_on_prepare+0x21/0x280 [ 80.476197][ T3416] ? lock_mm_and_find_vma+0xa1/0x300 [ 80.476211][ T3416] do_user_addr_fault+0x637/0x1450 [ 80.476219][ T3416] ? mntput_no_expire+0xc0/0x870 [ 80.476235][ T3416] ? __pfx_do_user_addr_fault+0x10/0x10 [ 80.476246][ T3416] ? trace_irq_disable+0x60/0x180 [ 80.476258][ T3416] exc_page_fault+0x67/0x110 [ 80.476272][ T3416] asm_exc_page_fault+0x26/0x30 [ 80.476280][ T3416] RIP: 0010:__put_user_4+0xd/0x20 [ 80.476293][ T3416] Code: 66 89 01 31 c9 0f 1f 00 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 1f 00 <89> 01 31 c9 0 [ 80.476312][ T3416] RSP: 0018:ffffc90004dffa38 EFLAGS: 00010206 [ 80.476322][ T3416] RAX: 000000000000000c RBX: 0000000000000000 RCX: 0000200000000200 [ 80.476329][ T3416] RDX: 0000000000000000 RSI: ffff888016abe300 RDI: ffff888017878c20 [ 80.476335][ T3416] RBP: ffffc90004dffc10 R08: 0000000000000000 R09: 0000000000000000 [ 80.476340][ T3416] R10: 0000000000000000 R11: ffffffff82034b65 R12: ffff888017c0a1e8 [ 80.476346][ T3416] R13: ffff88800d6a8200 R14: 0000000000000000 R15: ffff888017c08a38 [ 80.476354][ T3416] ? __might_fault+0xb5/0x130 [ 80.476367][ T3416] copy_process+0x1f64/0x3d80 [ 80.476375][ T3416] ? lockdep_hardirqs_on_prepare+0x21/0x280 [ 80.476388][ T3416] ? copy_process+0x996/0x3d80 [ 80.476399][ T3416] ? __pfx_copy_process+0x10/0x10 [ 80.476406][ T3416] ? from_pool+0x1e1/0x750 [ 80.476416][ T3416] ? handle_mm_fault+0x122e/0x1ab0 [ 80.476432][ T3416] kernel_clone+0x216/0x940 [ 80.476440][ T3416] ? __pfx_llist_del_first+0x10/0x10 [ 80.476448][ T3416] ? check_new_class+0x28a/0xe90 [ 80.476458][ T3416] ? __pfx_kernel_clone+0x10/0x10 [ 80.476468][ T3416] ? from_pool+0x1e1/0x750 [ 80.476478][ T3416] ? __pfx_from_pool+0x10/0x10 [ 80.476487][ T3416] ? __pfx_from_pool+0x10/0x10 [ 80.476502][ T3416] __x64_sys_clone+0x18d/0x1f0 [ 80.476512][ T3416] ? __pfx___x64_sys_clone+0x10/0x10 [ 80.476520][ T3416] ? llist_add_batch+0x111/0x1f0 [ 80.476532][ T3416] ? dept_task+0x5/0x20 [ 80.476539][ T3416] ? dept_on+0x1c/0x30 [ 80.476545][ T3416] ? dept_exit+0x1c5/0x2c0 [ 80.476553][ T3416] ? lockdep_hardirqs_on_prepare+0x21/0x280 [ 80.476565][ T3416] do_syscall_64+0x6f/0x120 [ 80.476573][ T3416] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 80.476580][ T3416] RIP: 0033:0x41b26d [ 80.476588][ T3416] Code: b3 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 8 [ 80.476595][ T3416] RSP: 002b:00007ffa1ad2d198 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 [ 80.476604][ T3416] RAX: ffffffffffffffda RBX: 00007ffa1ad2dcdc RCX: 000000000041b26d [ 80.476610][ T3416] RDX: 0000200000000200 RSI: 0000000000000000 RDI: 0000000000001200 [ 80.476616][ T3416] RBP: 00007ffa1ad2d1e0 R08: 0000000000000000 R09: 0000000000000000 [ 80.476621][ T3416] R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffa1ad2d6c0 [ 80.476626][ T3416] R13: ffffffffffffffb8 R14: 0000000000000002 R15: 00007ffd95d76940 [ 80.476638][ T3416]