* [rgushchin:bpfoom.1.6] [mm] 2bdadc8e5c: WARNING:suspicious_RCU_usage
@ 2025-08-24 12:37 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2025-08-24 12:37 UTC (permalink / raw)
To: Roman Gushchin; +Cc: oe-lkp, lkp, Roman Gushchin, oliver.sang
Hello,
kernel test robot noticed "WARNING:suspicious_RCU_usage" on:
commit: 2bdadc8e5ce6f6b23d63d28cfacb0882852401f9 ("mm: introduce a bpf hook for OOM handling")
https://github.com/rgushchin/linux.git bpfoom.1.6
in testcase: trinity
version: trinity-i386-abe9de86-1_20230429
with following parameters:
runtime: 600s
config: x86_64-randconfig-101-20250522
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 <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202508242042.e9d8711f-lkp@intel.com
[ 496.402237][T17289] WARNING: suspicious RCU usage
[ 496.402834][T17289] 6.16.0-00002-g2bdadc8e5ce6 #1 Tainted: G T
[ 496.405807][T17289] -----------------------------
[ 496.406337][T17289] mm/bpf_oom.c:32 RCU-list traversed without holding the required lock!!
[ 496.407272][T17289]
[ 496.407272][T17289] other info that might help us debug this:
[ 496.407272][T17289]
[ 496.411009][T17289]
[ 496.411009][T17289] rcu_scheduler_active = 2, debug_locks = 1
[ 496.411886][T17289] 4 locks held by trinity-c2/17289:
[496.414256][T17289] #0: ffff88839840ae30 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: lookup_slow (fs/namei.c:1834)
[496.415329][T17289] #1: ffff888100238188 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_iop_lookup (include/linux/kernfs.h:399 fs/kernfs/dir.c:1223)
[496.418735][T17289] #2: ffffffff9ecc1c08 (oom_lock){+.+.}-{4:4}, at: __alloc_pages_may_oom (mm/page_alloc.c:3785)
[496.419781][T17289] #3: ffffffff9ed2ba70 (bpf_oom_srcu){.+.+}-{0:0}, at: srcu_read_lock (include/linux/srcu.h:161 include/linux/srcu.h:253)
[ 496.422883][T17289]
[ 496.422883][T17289] stack backtrace:
[ 496.423421][T17289] CPU: 1 UID: 65534 PID: 17289 Comm: trinity-c2 Tainted: G T 6.16.0-00002-g2bdadc8e5ce6 #1 VOLUNTARY
[ 496.423435][T17289] Tainted: [T]=RANDSTRUCT
[ 496.423439][T17289] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 496.423444][T17289] Call Trace:
[ 496.423449][T17289] <TASK>
[496.423457][T17289] dump_stack_lvl (lib/dump_stack.c:123)
[496.423475][T17289] dump_stack (lib/dump_stack.c:130)
[496.423485][T17289] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6872)
[496.423506][T17289] bpf_handle_oom (mm/bpf_oom.c:32 (discriminator 11))
[496.423519][T17289] ? constrained_alloc (arch/x86/include/asm/atomic64_64.h:15 include/linux/atomic/atomic-arch-fallback.h:2583 include/linux/atomic/atomic-long.h:38 include/linux/atomic/atomic-instrumented.h:3189 include/linux/mm.h:52 mm/oom_kill.c:276)
[496.423540][T17289] out_of_memory (mm/oom_kill.c:1179)
[496.423557][T17289] ? oom_killer_disable (mm/oom_kill.c:1124)
[496.423582][T17289] __alloc_pages_may_oom (mm/page_alloc.c:3837)
[496.423599][T17289] ? __alloc_pages_cpuset_fallback (mm/page_alloc.c:3769)
[496.423641][T17289] __alloc_pages_slowpath+0x760/0x87a
[496.423668][T17289] ? warn_alloc (mm/page_alloc.c:4407)
[496.423697][T17289] __alloc_frozen_pages_noprof (mm/page_alloc.c:4972)
[496.423710][T17289] ? __alloc_pages_slowpath+0x87a/0x87a
[496.423737][T17289] ? policy_nodemask (include/linux/nodemask.h:253 mm/mempolicy.c:2206)
[496.423753][T17289] alloc_pages_mpol (mm/mempolicy.c:2421)
[496.423760][T17289] ? lock_acquire (include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834)
[496.423773][T17289] ? policy_nodemask (mm/mempolicy.c:2376)
[496.423796][T17289] alloc_frozen_pages_noprof (mm/mempolicy.c:2492)
[496.423807][T17289] alloc_slab_page (mm/slub.c:2451)
[496.423818][T17289] allocate_slab (mm/slub.c:2627)
[496.423835][T17289] new_slab (mm/slub.c:2675 (discriminator 9))
[496.423846][T17289] ___slab_alloc (mm/slub.c:3859)
[496.423859][T17289] ? alloc_inode (fs/inode.c:348)
[496.423884][T17289] ? alloc_inode (fs/inode.c:348)
[496.423893][T17289] ? __might_sleep (kernel/sched/core.c:8730 (discriminator 17))
[496.423911][T17289] ? alloc_inode (fs/inode.c:348)
[496.423920][T17289] __slab_alloc+0x1e/0x39
[496.423929][T17289] kmem_cache_alloc_lru_noprof (mm/slub.c:4088 mm/slub.c:4187 mm/slub.c:4216)
[496.423949][T17289] alloc_inode (fs/inode.c:348)
[496.423963][T17289] iget_locked (fs/inode.c:1439)
[496.423980][T17289] kernfs_get_inode (fs/kernfs/inode.c:251)
[496.423997][T17289] kernfs_iop_lookup (fs/kernfs/dir.c:1236)
[496.424014][T17289] __lookup_slow (fs/namei.c:1817)
[496.424029][T17289] ? lookup_dcache (fs/namei.c:1793)
[496.424078][T17289] ? rwsem_down_read_slowpath (kernel/locking/rwsem.c:1522)
[496.424103][T17289] lookup_slow (include/linux/fs.h:894 fs/namei.c:1835)
[496.424119][T17289] walk_component (fs/namei.c:2138)
[496.424135][T17289] path_lookupat (fs/namei.c:2639 fs/namei.c:2663)
[496.424153][T17289] filename_lookup (fs/namei.c:2693)
[496.424159][T17289] ? __might_fault (mm/memory.c:6971 mm/memory.c:6965)
[496.424173][T17289] ? may_linkat (fs/namei.c:2686)
[496.424234][T17289] ? __kasan_check_write (mm/kasan/shadow.c:38)
[496.424247][T17289] ? getname_flags (arch/x86/include/asm/atomic.h:28 include/linux/atomic/atomic-arch-fallback.h:503 include/linux/atomic/atomic-instrumented.h:68 fs/namei.c:132 fs/namei.c:213)
[496.424265][T17289] user_path_at (fs/namei.c:3138)
[496.424279][T17289] do_fchownat (fs/open.c:815)
[496.424294][T17289] ? chown_common (fs/open.c:803)
[496.424318][T17289] __do_sys_lchown16 (kernel/uid16.c:31 (discriminator 8))
[496.424327][T17289] __ia32_sys_lchown16 (kernel/uid16.c:28)
[496.424340][T17289] ia32_sys_call (kbuild/obj/consumer/x86_64-randconfig-101-20250522/./arch/x86/include/generated/asm/syscalls_32.h:17)
[496.424352][T17289] __do_fast_syscall_32 (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:306)
[496.424368][T17289] do_fast_syscall_32 (arch/x86/entry/syscall_32.c:331)
[496.424380][T17289] do_SYSENTER_32 (arch/x86/entry/syscall_32.c:370)
[496.424390][T17289] entry_SYSENTER_compat_after_hwframe (arch/x86/entry/entry_64_compat.S:127)
[ 496.424399][T17289] RIP: 0023:0xf7f15589
[ 496.424408][T17289] Code: 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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 90 90 90 90 90 90 90 90 90 90 90 90 90 90
All code
========
0: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
...
20:* 00 51 52 add %dl,0x52(%rcx) <-- trapping instruction
23: 55 push %rbp
24: 89 e5 mov %esp,%ebp
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: 90 nop
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop
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: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250824/202508242042.e9d8711f-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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