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Hello, kernel test robot noticed "WARNING:suspicious_RCU_usage" on: commit: 9d65581539252fdb1666917a09549c13090fe9e5 ("landlock: Always allow signals between threads of the same process") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master [test failed on linux-next/master eb4bc4b07f66f01618d9cb1aa4eaef59b1188415] in testcase: trinity version: trinity-x86_64-ba2360ed-1_20241228 with following parameters: runtime: 300s group: group-00 nr_groups: 5 config: x86_64-randconfig-101-20250325 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/202503261510.f9652c11-lkp@intel.com [ 166.893101][ T3747] WARNING: suspicious RCU usage [ 166.893462][ T3747] 6.14.0-rc5-00006-g9d6558153925 #1 Not tainted [ 166.893895][ T3747] ----------------------------- [ 166.894239][ T3747] kernel/pid.c:414 suspicious rcu_dereference_check() usage! [ 166.894747][ T3747] [ 166.894747][ T3747] other info that might help us debug this: [ 166.894747][ T3747] [ 166.895450][ T3747] [ 166.895450][ T3747] rcu_scheduler_active = 2, debug_locks = 1 [ 166.896030][ T3747] 3 locks held by trinity-c2/3747: [ 166.896415][ T3747] #0: ffff888114a5a930 (&group->mark_mutex){+.+.}-{4:4}, at: fcntl_dirnotify (include/linux/sched/mm.h:332 include/linux/sched/mm.h:386 include/linux/fsnotify_backend.h:279 fs/notify/dnotify/dnotify.c:329) [ 166.897165][ T3747] #1: ffff888148bbea60 (&mark->lock){+.+.}-{3:3}, at: fcntl_dirnotify (fs/notify/dnotify/dnotify.c:349) [ 166.897831][ T3747] #2: ffff888108a53220 (&f_owner->lock){....}-{3:3}, at: __f_setown (fs/fcntl.c:137) [ 166.898481][ T3747] [ 166.898481][ T3747] stack backtrace: [ 166.898901][ T3747] CPU: 0 UID: 65534 PID: 3747 Comm: trinity-c2 Not tainted 6.14.0-rc5-00006-g9d6558153925 #1 [ 166.898908][ T3747] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 166.898912][ T3747] Call Trace: [ 166.898916][ T3747] [ 166.898921][ T3747] dump_stack_lvl (lib/dump_stack.c:123) [ 166.898932][ T3747] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) [ 166.898945][ T3747] pid_task (kernel/pid.c:414 (discriminator 11)) [ 166.898954][ T3747] hook_file_set_fowner (security/landlock/fs.c:1651 (discriminator 9)) [ 166.898963][ T3747] security_file_set_fowner (arch/x86/include/asm/atomic.h:23 (discriminator 4) include/linux/atomic/atomic-arch-fallback.h:457 (discriminator 4) include/linux/jump_label.h:262 (discriminator 4) security/security.c:3062 (discriminator 4)) [ 166.898969][ T3747] __f_setown (fs/fcntl.c:145) [ 166.898980][ T3747] fcntl_dirnotify (fs/notify/dnotify/dnotify.c:233 fs/notify/dnotify/dnotify.c:371) [ 166.898996][ T3747] do_fcntl (fs/fcntl.c:539) [ 166.899002][ T3747] ? f_getown (fs/fcntl.c:448) [ 166.899007][ T3747] ? check_prev_add (kernel/locking/lockdep.c:3862) [ 166.899011][ T3747] ? do_syscall_64 (arch/x86/entry/common.c:102) [ 166.899023][ T3747] ? syscall_exit_to_user_mode (include/linux/entry-common.h:361 kernel/entry/common.c:220) [ 166.899038][ T3747] __x64_sys_fcntl (fs/fcntl.c:591 fs/fcntl.c:576 fs/fcntl.c:576) [ 166.899050][ T3747] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 166.899062][ T3747] ? find_held_lock (kernel/locking/lockdep.c:5341) [ 166.899072][ T3747] ? __lock_release+0x10b/0x440 [ 166.899076][ T3747] ? __task_pid_nr_ns (include/linux/rcupdate.h:347 include/linux/rcupdate.h:880 kernel/pid.c:514) [ 166.899082][ T3747] ? reacquire_held_locks (kernel/locking/lockdep.c:5502) [ 166.899087][ T3747] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4470) [ 166.899093][ T3747] ? do_syscall_64 (arch/x86/entry/common.c:102) [ 166.899099][ T3747] ? do_syscall_64 (arch/x86/entry/common.c:102) [ 166.899111][ T3747] ? syscall_exit_to_user_mode (include/linux/entry-common.h:361 kernel/entry/common.c:220) [ 166.899119][ T3747] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:469 kernel/locking/lockdep.c:4409) [ 166.899124][ T3747] ? do_syscall_64 (arch/x86/entry/common.c:102) [ 166.899129][ T3747] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4470) [ 166.899134][ T3747] ? do_syscall_64 (arch/x86/entry/common.c:102) [ 166.899139][ T3747] ? do_int80_emulation (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/jump_label.h:262 arch/x86/entry/common.c:230) [ 166.899149][ T3747] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 166.899155][ T3747] RIP: 0033:0x7f55ad007719 [ 166.899159][ T3747] Code: 08 89 e8 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 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 ff ff 73 01 c3 48 8b 0d b7 06 0d 00 f7 d8 64 89 01 48 All code ======== 0: 08 89 e8 5b 5d c3 or %cl,-0x3ca2a418(%rcx) 6: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) d: 00 00 00 10: 90 nop 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 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 b7 06 0d 00 mov 0xd06b7(%rip),%rcx # 0xd06f1 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 b7 06 0d 00 mov 0xd06b7(%rip),%rcx # 0xd06c7 10: f7 d8 neg %eax 12: 64 89 01 mov %eax,%fs:(%rcx) 15: 48 rex.W [ 166.899164][ T3747] RSP: 002b:00007ffff6eefb48 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 [ 166.899168][ T3747] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f55ad007719 [ 166.899172][ T3747] RDX: 0000000000000027 RSI: 0000000000000402 RDI: 0000000000000043 [ 166.899174][ T3747] RBP: 00007f55ab92f058 R08: 0000000099999999 R09: 00000000377dd000 [ 166.899177][ T3747] R10: 0000000084848484 R11: 0000000000000246 R12: 0000000000000048 [ 166.899180][ T3747] R13: 00007f55acf036c0 R14: 00007f55ab92f058 R15: 00007f55ab92f000 [ 166.899203][ T3747] The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250326/202503261510.f9652c11-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki