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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?ekZeHa/ow196J86/K0lAfFJlgUdCve24yYXtJHmW1a/iVJMkw5wQKQ9cl5G3?= =?us-ascii?Q?6gnSpSiyKG3YkQf1CkdGnRl1eZ7eBmpV8wtD8zVK1+e+lr+Vk0bjhTJQOBMM?= =?us-ascii?Q?G4YcVVi/ToAJO4puwLHI8FN0aUVFEA11ttlUnSd815KuuLCprgfrOBX8cYEs?= =?us-ascii?Q?MSN+cBOdGCliLfjhdSCEFWBywhV8Wwe3eQN1pyDa55a2z331iG2eny7tsBtX?= =?us-ascii?Q?msSSNER5UDDQAgNOZKFmMmpiq7Cv/NYNokjZP6X/ATBZSVIbsYnCKalE17hj?= =?us-ascii?Q?LoOQf/X9Uu18qv1Rb2q+5YVTwYu++NhWSvoqndk02dV45V5McfICtSDNsZtB?= =?us-ascii?Q?JQVygXHBQWVg9CCua77qc5u94CJcK7eU/Z+uviE2LMaL1e3TCREWt23rNqUb?= =?us-ascii?Q?ZF2SpWf99D2/cw+0+OGtxrD1ajgeuHhR2RswIqQoS27otmXPG15BzCZvjcRT?= =?us-ascii?Q?HCQsb1OLq/e90p9hDkhN0Ebmdwe8kkmS7G3aj94dXFyc4scc8tqJRYIaK1kk?= =?us-ascii?Q?I+CCQtzKEooJ+IQUdaFkhqYVV5jZcrHYeY/cSPTpb81y+p4WRS9t3nuGTH3x?= =?us-ascii?Q?hiZsYXXs3j8CgTRz8KpwhxrbdX/JIHKpZj4Dterhv70j4Il7sqwKHz32QJGu?= =?us-ascii?Q?NEzoqxRnnWxmpNUVdmFx5SfKLFmIKkTVIA+4Ur05di9er4a+elEmizWz367n?= =?us-ascii?Q?uxZqXCZNzXwgE5mbYQbDMFB4ab+RqtPaFnqzMRejVJEDGa1Qpq63BgKzTk60?= =?us-ascii?Q?4zQ1Q+MLUoEodxfBUU8/SAQDUvEGZg7gCq/SKmJzlSQ5KhdFuAFrFfKJNp/6?= =?us-ascii?Q?VBWtoPH/xNOoxe32iqJQZyo8zaBWHefPBtB4CW/tECYmXCJ5xSRRM7AvNItp?= =?us-ascii?Q?aMxGYjr+NINozW5G/nZb1opdorMYs08ntHV5yEWsCsaDZpwDIzKYsiPI8swT?= =?us-ascii?Q?DMbUQj4WW1MicBEvDEelxMTaczDwIzZiW0TPAZC6SkwHAX3VakSaYPpe1wKZ?= =?us-ascii?Q?KmrhmEX7ErBymQOHeqQN5+AGZvblxfmouqwMcODozlltnF5QNhVVvgDg/bZZ?= =?us-ascii?Q?/TuYDZwcXQW637uu0d5do8XXSTn6lvPqYmtpBBtFDY7mzeeBDlrjoOBbbkxY?= =?us-ascii?Q?G5nVPStKH0TFf1G25iOmpDSslDHEsDQd4TZACgBkbxOgzuPFwZQtIRCmR2Un?= =?us-ascii?Q?plzMy+8ud8yOwl4q8569/3W9R88sDsFDqeRjixoa/Y3OYRUp1nF1JH2RbGt+?= =?us-ascii?Q?4hxuUECrBd3EGsayQ0+H3ik9+TTEdJV8TzYTBuzrx++JUtsGqXWdlaC/LCDq?= =?us-ascii?Q?Ty81zAV4SE8QHx+K6nX71NDzf582eDqs/LleVsCp7o6YsTuvgljunY355Csb?= =?us-ascii?Q?cnY9yej0303J5NVbJQzm/iOZ5ksf1fslaE5oKzr35pwmRet3e5nMnOgTc2La?= =?us-ascii?Q?o+g75BalTS3cc9c7OIAFSh6So0wnXMxEXHSiOwMWf1KFeOpH/7ABONUoEEwe?= =?us-ascii?Q?EYlnPE3TJ+SsDJ1dvayCDDFXSlKxWwEsNCVuiZeZGeiP1GOrP+jxU6KvvvXl?= =?us-ascii?Q?fGKw9xMGuiPPeR9OIDKfSsd30M8uBAcuL7ZmZAksXVqS4dRkvsH8zSt+0Js/?= =?us-ascii?Q?gQ=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 7b566bb2-6030-4757-0640-08dbe422f8e0 X-MS-Exchange-CrossTenant-AuthSource: PH8PR11MB6779.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Nov 2023 08:31:46.1365 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: syiPG5mTggH1bPevReiHKEO7Z5gdL/8aQ1boA2KO0XQeTqK+ezq1j8J78L6MzbKNWHehVmXue/D1GLp7RMni1g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB6907 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, kernel test robot noticed "WARNING:suspicious_RCU_usage" on: commit: 8dade3a353290abfbfd3c38279c29c3c4ecd7356 ("proc: Implement /proc/self/meminfo") https://git.kernel.org/cgit/linux/kernel/git/legion/linux.git patchset/meminfo/v2.1 in testcase: trinity version: trinity-i386-abe9de86-1_20230429 with following parameters: runtime: 600s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ compiler: gcc-12 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (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 | Closes: https://lore.kernel.org/oe-lkp/202311131653.14708bb6-oliver.sang@intel.com the issue doesn't always happen, as below, we observed it 21 times out of 50 runs, but keeps clean on parent. v6.6-rc7 8dade3a353290abfbfd3c38279c ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :50 42% 21:50 dmesg.WARNING:suspicious_RCU_usage :50 42% 21:50 dmesg.include/linux/cgroup.h:#suspicious_rcu_dereference_check()usage [ 366.327498][ T3447] WARNING: suspicious RCU usage [ 366.328145][ T3447] 6.6.0-rc7-00001-g8dade3a35329 #1 Not tainted [ 366.329177][ T3447] ----------------------------- [ 366.329833][ T3447] include/linux/cgroup.h:436 suspicious rcu_dereference_check() usage! [ 366.330891][ T3447] [ 366.330891][ T3447] other info that might help us debug this: [ 366.330891][ T3447] [ 366.332203][ T3447] [ 366.332203][ T3447] rcu_scheduler_active = 2, debug_locks = 1 [ 366.333484][ T3447] 2 locks held by trinity-c5/3447: [ 366.334175][ T3447] #0: ffff88814ee10858 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos (fs/file.c:1066) [ 366.335356][ T3447] #1: ffff88814f3836c0 (&p->lock){+.+.}-{3:3}, at: seq_read_iter (fs/seq_file.c:188) [ 366.336736][ T3447] [ 366.336736][ T3447] stack backtrace: [ 366.337562][ T3447] CPU: 1 PID: 3447 Comm: trinity-c5 Not tainted 6.6.0-rc7-00001-g8dade3a35329 #1 10f1bfacea84478d84947570355f5fbda1b33451 [ 366.339032][ T3447] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 366.340233][ T3447] Call Trace: [ 366.340701][ T3447] [ 366.341175][ T3447] dump_stack_lvl (lib/dump_stack.c:107) [ 366.341814][ T3447] lockdep_rcu_suspicious (include/linux/context_tracking.h:153 kernel/locking/lockdep.c:6712) [ 366.342512][ T3447] mem_fill_meminfo (include/linux/cgroup.h:436 mm/memcontrol.c:4133) [ 366.343143][ T3447] proc_meminfo_show (fs/proc/meminfo.c:202) [ 366.343745][ T3447] ? meminfo_proc_show (fs/proc/meminfo.c:197) [ 366.344423][ T3447] ? get_pid_task (include/linux/rcupdate.h:308 include/linux/rcupdate.h:782 kernel/pid.c:458) [ 366.345071][ T3447] proc_single_show (include/linux/instrumented.h:96 include/linux/atomic/atomic-instrumented.h:400 include/linux/refcount.h:272 include/linux/refcount.h:315 include/linux/refcount.h:333 include/linux/sched/task.h:125 fs/proc/base.c:779) [ 366.345750][ T3447] seq_read_iter (fs/seq_file.c:230) [ 366.346411][ T3447] seq_read (fs/seq_file.c:163) [ 366.346973][ T3447] ? seq_read_iter (fs/seq_file.c:152) [ 366.347621][ T3447] ? seq_read_iter (fs/seq_file.c:152) [ 366.348247][ T3447] do_loop_readv_writev+0x130/0x440 [ 366.349039][ T3447] do_iter_read (fs/read_write.c:748 fs/read_write.c:797) [ 366.349683][ T3447] vfs_readv (fs/read_write.c:916) [ 366.350285][ T3447] ? vfs_iter_read (fs/read_write.c:907) [ 366.350879][ T3447] ? __fdget_pos (fs/file.c:1066) [ 366.351470][ T3447] ? mutex_lock_io_nested (kernel/locking/mutex.c:746) [ 366.352216][ T3447] ? preempt_count_sub (kernel/sched/core.c:5863 kernel/sched/core.c:5859 kernel/sched/core.c:5881) [ 366.352916][ T3447] do_readv (fs/read_write.c:952) [ 366.356628][ T3447] ? vfs_readv (fs/read_write.c:942) [ 366.357285][ T3447] __do_fast_syscall_32 (arch/x86/entry/common.c:112 arch/x86/entry/common.c:178) [ 366.357972][ T3447] do_fast_syscall_32 (arch/x86/entry/common.c:203) [ 366.358626][ T3447] entry_SYSENTER_compat_after_hwframe (arch/x86/entry/entry_64_compat.S:122) [ 366.359427][ T3447] RIP: 0023:0xf7f2a579 [ 366.360000][ T3447] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 cc 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 All code ======== 0: b8 01 10 06 03 mov $0x3061001,%eax 5: 74 b4 je 0xffffffffffffffbb 7: 01 10 add %edx,(%rax) 9: 07 (bad) a: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi e: 10 08 adc %cl,(%rax) 10: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi ... 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24:* 89 e5 mov %esp,%ebp <-- trapping instruction 26: 0f 34 sysenter 28: cd 80 int $0x80 2a: 5d pop %rbp 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: cc int3 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi Code starting with the faulting instruction =========================================== 0: 5d pop %rbp 1: 5a pop %rdx 2: 59 pop %rcx 3: c3 ret 4: cc int3 5: 90 nop 6: 90 nop 7: 90 nop 8: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi f: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi [ 366.362302][ T3447] RSP: 002b:00000000ffa75f8c EFLAGS: 00000296 ORIG_RAX: 0000000000000091 [ 366.363394][ T3447] RAX: ffffffffffffffda RBX: 00000000000000f7 RCX: 00000000580da6e0 [ 366.364419][ T3447] RDX: 000000000000005c RSI: 00000000710d3b51 RDI: 00000000ffffffff [ 366.365453][ T3447] RBP: 00000000ffff0100 R08: 0000000000000000 R09: 0000000000000000 [ 366.366492][ T3447] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 366.367518][ T3447] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 366.368584][ T3447] [ 382.029705][ T3448] trinity-c6 (3448): attempted to duplicate a private mapping with mremap. This is not supported. [ 393.577743][ T3063] [main] 10786 iterations. [F:8083 S:2663 HI:1623] The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20231113/202311131653.14708bb6-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki