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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2026 02:08:16.8770 (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: Q7ihoeKv1EaSYrBKY2ZlYAMaJAi9TI3gGKKSTLAjJGI+DnwXjZIlCMdlFQjI1lxcGweBaf4Qw/PFPiHumngatw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR11MB7966 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "WARNING:suspicious_RCU_usage" on: commit: a7bc95298723a9c79cc429adfb7dc1f37ff55a8d ("[PATCH] btrfs: sink RCU protection to _btrfs_printk()") url: https://github.com/intel-lab-lkp/linux/commits/David-Sterba/btrfs-sink-RCU-protection-to-_btrfs_printk/20260205-194735 base: https://git.kernel.org/cgit/linux/kernel/git/kdave/linux.git for-next patch link: https://lore.kernel.org/all/20260205114546.210418-1-dsterba@suse.com/ patch subject: [PATCH] btrfs: sink RCU protection to _btrfs_printk() in testcase: perf-sanity-tests version: with following parameters: perf_compiler: clang group: group-02 config: x86_64-rhel-9.4-bpf compiler: gcc-14 test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G 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 | Closes: https://lore.kernel.org/oe-lkp/202602130950.db059ac8-lkp@intel.com kern :warn : [ 282.723760] [ T5053] WARNING: suspicious RCU usage kern :warn : [ 282.723764] [ T5053] 6.19.0-rc8-00144-ga7bc95298723 #1 Tainted: G S kern :warn : [ 282.723768] [ T5053] ----------------------------- kern :warn : [ 282.723769] [ T5053] fs/btrfs/volumes.h:856 suspicious rcu_dereference_check() usage! kern :warn : [ 282.723773] [ T5053] other info that might help us debug this: kern :warn : [ 282.723775] [ T5053] rcu_scheduler_active = 2, debug_locks = 1 kern :warn : [ 282.723778] [ T5053] 4 locks held by mount/5053: kern :warn : [ 282.723780] [ T5053] #0: ff1100058fa07c70 (&fc->uapi_mutex){+.+.}-{4:4}, at: __do_sys_fsconfig (fs/fsopen.c:472) kern :warn : [ 282.733684] [ T5053] #1: ff1100080763a0e0 (&type->s_umount_key#45 user :notice: [ 282.739077] [ T979] File "/usr/bin/py3clean", line 209, in kern :warn : [ 282.746062] [ T5053] /1 kern :warn : [ 282.758521] [ T5053] ){+.+.}-{4:4}, at: alloc_super (fs/super.c:346) user :notice: [ 282.768758] [ T979] main() kern :warn : [ 282.776531] [ T5053] #2: ff110005cb3fb8d8 (&fs_devs->device_list_mutex){+.+.}-{4:4} kern :warn : [ 282.790726] [ T5053] , at: btrfs_init_dev_stats (fs/btrfs/volumes.c:7975) btrfs user :notice: [ 282.793082] [ T979] ~~~~^^ kern :warn : [ 282.799023] [ T5053] #3: kern :warn : [ 282.807834] [ T5053] ff1100019d555d18 (btrfs-dev-00 user :notice: [ 282.810637] [ T979] File "/usr/bin/py3clean", line 195, in main kern :warn : [ 282.815878] [ T5053] ){.+.+}-{4:4}, at: btrfs_tree_read_lock_nested (arch/x86/include/asm/jump_label.h:37 include/trace/events/btrfs.h:2293 fs/btrfs/locking.c:147) btrfs kern :warn : [ 282.826610] [ T5053] stack backtrace: kern :warn : [ 282.826616] [ T5053] CPU: 9 UID: 0 PID: 5053 Comm: mount Tainted: G S 6.19.0-rc8-00144-ga7bc95298723 #1 PREEMPT(full) kern :warn : [ 282.826622] [ T5053] Tainted: [S]=CPU_OUT_OF_SPEC kern :warn : [ 282.826624] [ T5053] Hardware name: Inspur NF5180M6/NF5180M6, BIOS 06.00.04 04/12/2022 kern :warn : [ 282.826626] [ T5053] Call Trace: kern :warn : [ 282.826630] [ T5053] kern :warn : [ 282.826632] [ T5053] dump_stack_lvl (lib/dump_stack.c:122) kern :warn : [ 282.826640] [ T5053] lockdep_rcu_suspicious.cold (kernel/locking/lockdep.c:6877) kern :warn : [ 282.826648] [ T5053] btrfs_dev_name (fs/btrfs/volumes.h:856 (discriminator 9) fs/btrfs/volumes.h:851 (discriminator 9)) btrfs kern :warn : [ 282.826845] [ T5053] btrfs_device_init_dev_stats (fs/btrfs/volumes.c:8119 (discriminator 6) fs/btrfs/volumes.c:7957 (discriminator 6)) btrfs kern :warn : [ 282.827048] [ T5053] ? __pfx_btrfs_device_init_dev_stats (fs/btrfs/volumes.c:7921) btrfs kern :warn : [ 282.827256] [ T5053] ? kasan_save_track (mm/kasan/common.c:70 (discriminator 1) mm/kasan/common.c:79 (discriminator 1)) kern :warn : [ 282.827262] [ T5053] ? __kasan_slab_alloc (mm/kasan/common.c:340 mm/kasan/common.c:366) kern :warn : [ 282.827267] [ T5053] ? __rcu_read_lock (kernel/rcu/tree_plugin.h:416 (discriminator 2)) kern :warn : [ 282.827273] [ T5053] ? kmem_cache_alloc_noprof (include/trace/events/kmem.h:12 (discriminator 2) mm/slub.c:5273 (discriminator 2)) kern :warn : [ 282.827280] [ T5053] ? btrfs_init_dev_stats (fs/btrfs/volumes.c:7970) btrfs kern :warn : [ 282.827494] [ T5053] btrfs_init_dev_stats (fs/btrfs/volumes.c:7977) btrfs kern :warn : [ 282.827707] [ T5053] open_ctree (fs/btrfs/disk-io.c:3546) btrfs kern :warn : [ 282.827910] [ T5053] btrfs_get_tree_super.cold (fs/btrfs/super.c:982 fs/btrfs/super.c:1944) btrfs kern :warn : [ 282.828112] [ T5053] btrfs_get_tree_subvol (fs/btrfs/super.c:2087) btrfs kern :warn : [ 282.828315] [ T5053] vfs_get_tree (fs/super.c:1751) kern :warn : [ 282.828322] [ T5053] vfs_cmd_create (fs/fsopen.c:231) kern :warn : [ 282.828328] [ T5053] __do_sys_fsconfig (fs/fsopen.c:474) kern :warn : [ 282.828333] [ T5053] ? __pfx___do_sys_fsconfig (fs/fsopen.c:356) kern :warn : [ 282.828337] [ T5053] ? do_faccessat (fs/open.c:530) kern :warn : [ 282.828345] [ T5053] ? __pfx_do_faccessat (fs/open.c:465) kern :warn : [ 282.828352] [ T5053] ? do_syscall_64 (arch/x86/include/asm/irqflags.h:42 arch/x86/include/asm/irqflags.h:119 include/linux/entry-common.h:108 arch/x86/entry/syscall_64.c:90) kern :warn : [ 282.828360] [ T5053] do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) kern :warn : [ 282.828364] [ T5053] ? do_syscall_64 (include/linux/irq-entry-common.h:298 include/linux/entry-common.h:196 arch/x86/entry/syscall_64.c:100) kern :warn : [ 282.828371] [ T5053] ? do_syscall_64 (arch/x86/entry/syscall_64.c:113) kern :warn : [ 282.828376] [ T5053] ? do_syscall_64 (include/linux/irq-entry-common.h:298 include/linux/entry-common.h:196 arch/x86/entry/syscall_64.c:100) kern :warn : [ 282.828382] [ T5053] ? do_syscall_64 (arch/x86/entry/syscall_64.c:113) kern :warn : [ 282.828386] [ T5053] ? __pfx_from_kgid_munged (kernel/user_namespace.c:534) kern :warn : [ 282.828392] [ T5053] ? do_syscall_64 (include/linux/irq-entry-common.h:298 include/linux/entry-common.h:196 arch/x86/entry/syscall_64.c:100) kern :warn : [ 282.828396] [ T5053] ? do_syscall_64 (include/linux/irq-entry-common.h:298 include/linux/entry-common.h:196 arch/x86/entry/syscall_64.c:100) kern :warn : [ 282.828402] [ T5053] ? do_syscall_64 (arch/x86/entry/syscall_64.c:113) kern :warn : [ 282.828406] [ T5053] ? do_syscall_64 (arch/x86/entry/syscall_64.c:113) kern :warn : [ 282.828409] [ T5053] ? do_syscall_64 (include/linux/irq-entry-common.h:298 include/linux/entry-common.h:196 arch/x86/entry/syscall_64.c:100) kern :warn : [ 282.828415] [ T5053] ? do_syscall_64 (arch/x86/entry/syscall_64.c:113) kern :warn : [ 282.828418] [ T5053] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4629 (discriminator 4)) kern :warn : [ 282.828423] [ T5053] ? clear_bhb_loop (arch/x86/entry/entry_64.S:1549) kern :warn : [ 282.828430] [ T5053] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131) kern :warn : [ 282.828434] [ T5053] RIP: 0033:0x7f5027d8b4aa kern :warn : [ 282.828458] [ T5053] Code: 73 01 c3 48 8b 0d 4e 59 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 af 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 1e 59 0d 00 f7 d8 64 89 01 48 All code ======== 0: 73 01 jae 0x3 2: c3 ret 3: 48 8b 0d 4e 59 0d 00 mov 0xd594e(%rip),%rcx # 0xd5958 a: f7 d8 neg %eax c: 64 89 01 mov %eax,%fs:(%rcx) f: 48 83 c8 ff or $0xffffffffffffffff,%rax 13: c3 ret 14: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 1b: 00 00 00 1e: 66 90 xchg %ax,%ax 20: 49 89 ca mov %rcx,%r10 23: b8 af 01 00 00 mov $0x1af,%eax 28: 0f 05 syscall 2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 8b 0d 1e 59 0d 00 mov 0xd591e(%rip),%rcx # 0xd5958 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax 6: 73 01 jae 0x9 8: c3 ret 9: 48 8b 0d 1e 59 0d 00 mov 0xd591e(%rip),%rcx # 0xd592e 10: f7 d8 neg %eax 12: 64 89 01 mov %eax,%fs:(%rcx) 15: 48 rex.W kern :warn : [ 282.828462] [ T5053] RSP: 002b:00007ffde3afb828 EFLAGS: 00000246 ORIG_RAX: 00000000000001af kern :warn : [ 282.828466] [ T5053] RAX: ffffffffffffffda RBX: 0000561df73281d0 RCX: 00007f5027d8b4aa kern :warn : [ 282.828469] [ T5053] RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 kern :warn : [ 282.828472] [ T5053] RBP: 0000561df7329ca0 R08: 0000000000000000 R09: 0000000000000000 kern :warn : [ 282.828474] [ T5053] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 kern :warn : [ 282.828476] [ T5053] R13: 00007f5027f1d580 R14: 00007f5027f1f26c R15: 00007f5027f04a23 kern :warn : [ 282.828490] [ T5053] kern :info : [ 282.828501] [ T5053] BTRFS info (device nvme0n1p4): bdev /dev/nvme0n1p4 errs: wr 0, rd 0, flush 0, corrupt 3073, gen 0 user :notice: [ 282.829495] [ T979] pfiles = set(dpf.from_package(options.package)) kern :info : [ 282.868038] [ T5053] BTRFS info (device nvme0n1p4): enabling ssd optimizations kern :info : [ 282.871066] [ T5053] BTRFS info (device nvme0n1p4): turning on async discard kern :info : [ 282.871071] [ T5053] BTRFS info (device nvme0n1p4): enabling disk space caching The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260213/202602130950.db059ac8-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki