From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from invmail4.hynix.com (exvmail4.hynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C88C319CC3D; Fri, 16 May 2025 07:43:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.125.252.92 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747381431; cv=none; b=HeNfT/peE1dyrXDj3hA3n7hSpG0jEeUdbTB50g/nfTKW4On9Dinu7OfD5z+TU7GUcWYwiqqvHEXDZwMevBSLxD6PMcrbLIBYGggQl7r+6AyJHGCZlvy7lwlpUe7GLBv1iPb4+pqSsxsdyisVXfhJ+HUDirMLdWGTIat++LEYsVQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747381431; c=relaxed/simple; bh=pUB8kWmfTQwWnJKNexiTqVZZyq1E6kxuFyWU6pyDkn4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=U9qr2KHLmDlwX7bLXgCuYxMy8DfmU49RRmHmVphdDTEiwwa6Jmb8qTCWHcEOEBRbkUAMRKTyaDXSENHw/Y33Pf7dKRiyOTVuwDVefpCqoZW6CX6AaJDa6vTb3QMUKFP46N1EM5Yhepm+X442nysxcXbU8JQnU8kvHvj9iZVafok= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-681ff7000002311f-d3-6826ecadf50a Date: Fri, 16 May 2025 16:43:36 +0900 From: Byungchul Park To: Gavin Guo 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 Subject: Re: [PATCH] mm/hugetlb: fix a deadlock with pagecache_folio and hugetlb_fault_mutex_table Message-ID: <20250516074336.GA42829@system.software.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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpkkeLIzCtJLcpLzFFi42LhesuzSHfdG7UMgw/bOCzmrF/DZrFk7Rlm i5e7tjFZPP3Ux2Jx7sV3JovLu+awWdxb85/V4uP+YItlOx+yWJyZVmTRPfMHq8WCjY8YHXg8 Fmwq9Zgwu5vNY9OnSeweJ2b8ZvFY2DCV2ePj01ssHu/3XWXz2Hy62uPzJrkAzigum5TUnMyy 1CJ9uwSujAunZ7EVNJVXzH7VyNTAuDW+i5GTQ0LAROL91sdsMPaxpvesIDaLgKrEo+99LCA2 m4C6xI0bP5lBbBEBZYkPUw4Cxbk4mAVOMElcnLeIHSQhLJAice3ANrAGXgELiTkN1xhBioQE /jNKfGnfBZUQlDg58wmYzSygJXHj30umLkYOIFtaYvk/DpAwp4CdxMf2FUwgtijQsgPbjjOB zJEQeM0msfLcVWaISyUlDq64wTKBUWAWkrGzkIydhTB2ASPzKkahzLyy3MTMHBO9jMq8zAq9 5PzcTYzAiFlW+yd6B+OnC8GHGAU4GJV4eB2uq2YIsSaWFVfmHmKU4GBWEuG9nqWcIcSbklhZ lVqUH19UmpNafIhRmoNFSZzX6Ft5ipBAemJJanZqakFqEUyWiYNTqoFR8f8zo1872Z8cLpM2 7nj5L2rF3PIZVyJaH4s/EvM1knGT89CdtaGXN6Yuatfne/kdbiLvWP/N/SNd9JNtq4POSr2H 7/nm8zkeE9knITDjU2ek5+uP/19k6Po0SS3PTY9ySVz8OPkNQ1Fzp/ijt7JuLLtlJ7E3u62P Ocb7s4hLZbWFfMS3d5xKLMUZiYZazEXFiQAeGEKBlAIAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrBLMWRmVeSWpSXmKPExsXC5WfdrLv2jVqGwfef5hZz1q9hs1iy9gyz xctd25gsnn7qY7E49+I7k8XhuSdZLS7vmsNmcW/Nf1aLj/uDLZbtfMhicWZakUX3zB+sFgs2 PmJ04PVYsKnUY8LsbjaPTZ8msXucmPGbxWNhw1Rmj49Pb7F4vN93lc1j8YsPTB6bT1d7fN4k F8AVxWWTkpqTWZZapG+XwJVx4fQstoKm8orZrxqZGhi3xncxcnJICJhIHGt6zwpiswioSjz6 3scCYrMJqEvcuPGTGcQWEVCW+DDlIFCci4NZ4ASTxMV5i9hBEsICKRLXDmwDa+AVsJCY03CN EaRISOA/o8SX9l1QCUGJkzOfgNnMAloSN/69ZOpi5ACypSWW/+MACXMK2El8bF/BBGKLAi07 sO040wRG3llIumch6Z6F0L2AkXkVo0hmXlluYmaOqV5xdkZlXmaFXnJ+7iZGYPgvq/0zcQfj l8vuhxgFOBiVeHgdrqtmCLEmlhVX5h5ilOBgVhLhvZ6lnCHEm5JYWZValB9fVJqTWnyIUZqD RUmc1ys8NUFIID2xJDU7NbUgtQgmy8TBKdXAyHZm1+HY4xJldqv+hxoJ/j64d2Js6ERN7fmy rclLnb9LCFvEfutSOLvn5GH+1e/ZZpzsWn9zd4Zy196EBf4zr8/UW3PTfaVZ3u6OIinLSG9n +aBV7zQK99YcitO/qvc8OlRO7ne2yLcTfzMEZhvsUtj0YPutKUJ72i9vandSTy5YYBGZonFO W4mlOCPRUIu5qDgRAN2BIR97AgAA X-CFilter-Loop: Reflected On Fri, May 16, 2025 at 03:32:35PM +0800, Gavin Guo wrote: > 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: Thank you for the testing again! Yeah, dept works well as I expected. I shouldn't have suppressed dept reports too aggressively, but.. I (or we if any) need to deal with the existing false positives one by one by using dept annotations. Thanks again for confirming it. Byungchul > 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]