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b=G6s6Box/nOEmZzPU6orctfugCEwp72/oiDoYfjzs2pM1NL/tD+dCoI+u6V9gYHNay bt6nYp3yXO3YbaVCDr8Xq+2gEUKprKhDQXubbLNWVyiaiup8BnMGGpn96hXcN9tf85 2K38SGHkxwiKLPuM8iUAFmPYwtElGD3w1BKt7hKw= Date: Thu, 9 Oct 2025 16:52:41 -0700 From: Andrew Morton To: syzbot Cc: hannes@cmpxchg.org, jackmanb@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.com, netdev@vger.kernel.org, surenb@google.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, ziy@nvidia.com, bpf@vger.kernel.org Subject: Re: [syzbot] [mm?] WARNING: locking bug in __set_page_owner (2) Message-Id: <20251009165241.4d78dc5d9fa5525d988806b5@linux-foundation.org> In-Reply-To: <68e7e6ad.a70a0220.126b66.0043.GAE@google.com> References: <68e7e6ad.a70a0220.126b66.0043.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: uakz8kkew8huyrayyq61usdz98nonbd4 X-Rspamd-Queue-Id: 18568140004 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1760053962-982992 X-HE-Meta: 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 die1XvqI 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 QZliNL4E 9x0JgDLZDNN2cRpS61qISjKRnQp2qayMZ/aTz+2T043A3zp3ox7iQsOUbq+CIYkHMTC/k2JDU7Xh+OsMTWkNsuPxzzx05zergPfFQPQMunjHUfMAs47wQPvQ5CnE4BR3 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 09 Oct 2025 09:45:33 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 2c95a756e0cf net: pse-pd: tps23881: Fix current measuremen.. > git tree: net > console output: https://syzkaller.appspot.com/x/log.txt?x=16e1852f980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=5bcbbf19237350b5 > dashboard link: https://syzkaller.appspot.com/bug?extid=8259e1d0e3ae8ed0c490 > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/8272657e4298/disk-2c95a756.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4e53ba690f28/vmlinux-2c95a756.xz > kernel image: https://storage.googleapis.com/syzbot-assets/6112d620d6fc/bzImage-2c95a756.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+8259e1d0e3ae8ed0c490@syzkaller.appspotmail.com At 2c95a756e0cf, page_owner.c hasn't been modified in a couple of years. How can add_stack_record_to_list()'s spin_lock_irqsave() be "invalid wait context"? In NMI, yes, but the trace doesn't indicate that we're in an NMI. Confused. I'm suspecting BPF involvement. Cc'ed for help, please. > ============================= > [ BUG: Invalid wait context ] > syzkaller #0 Not tainted > ----------------------------- > syz.3.7709/29103 is trying to lock: > ffffffff8e276d58 (stack_list_lock){-.-.}-{3:3}, at: add_stack_record_to_list mm/page_owner.c:182 [inline] > ffffffff8e276d58 (stack_list_lock){-.-.}-{3:3}, at: inc_stack_record_count mm/page_owner.c:214 [inline] > ffffffff8e276d58 (stack_list_lock){-.-.}-{3:3}, at: __set_page_owner+0x2c3/0x4a0 mm/page_owner.c:333 > other info that might help us debug this: > context-{2:2} > 6 locks held by syz.3.7709/29103: > #0: ffffffff8e190068 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_register_prio_may_exist+0x43/0xa0 kernel/tracepoint.c:431 > #1: ffffffff8dfd2a70 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_enable+0x12/0x20 kernel/jump_label.c:222 > #2: ffffffff8e1f5748 (jump_label_mutex){+.+.}-{4:4}, at: jump_label_lock kernel/jump_label.c:27 [inline] > #2: ffffffff8e1f5748 (jump_label_mutex){+.+.}-{4:4}, at: static_key_enable_cpuslocked+0xcb/0x250 kernel/jump_label.c:207 > #3: ffffffff8dfe5e68 (text_mutex){+.+.}-{4:4}, at: arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:145 > #4: ffffffff8e13a960 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] > #4: ffffffff8e13a960 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] > #4: ffffffff8e13a960 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2074 [inline] > #4: ffffffff8e13a960 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x186/0x4b0 kernel/trace/bpf_trace.c:2116 > #5: ffff8880b8632780 ((stream_local_lock).llock){....}-{3:3}, at: local_trylock_acquire include/linux/local_lock_internal.h:45 [inline] > #5: ffff8880b8632780 ((stream_local_lock).llock){....}-{3:3}, at: bpf_stream_page_local_lock kernel/bpf/stream.c:46 [inline] > #5: ffff8880b8632780 ((stream_local_lock).llock){....}-{3:3}, at: bpf_stream_elem_alloc kernel/bpf/stream.c:175 [inline] > #5: ffff8880b8632780 ((stream_local_lock).llock){....}-{3:3}, at: __bpf_stream_push_str+0x1db/0xc90 kernel/bpf/stream.c:190 > stack backtrace: > CPU: 0 UID: 0 PID: 29103 Comm: syz.3.7709 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 > Call Trace: > > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > print_lock_invalid_wait_context kernel/locking/lockdep.c:4830 [inline] > check_wait_context kernel/locking/lockdep.c:4902 [inline] > __lock_acquire+0xbcb/0xd20 kernel/locking/lockdep.c:5187 > lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] > _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 > add_stack_record_to_list mm/page_owner.c:182 [inline] > inc_stack_record_count mm/page_owner.c:214 [inline] > __set_page_owner+0x2c3/0x4a0 mm/page_owner.c:333 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 > prep_new_page mm/page_alloc.c:1859 [inline] > get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 > alloc_pages_nolock_noprof+0x94/0x120 mm/page_alloc.c:7554 > bpf_stream_page_replace+0x17/0x1e0 kernel/bpf/stream.c:86 > bpf_stream_page_reserve_elem kernel/bpf/stream.c:148 [inline] > bpf_stream_elem_alloc kernel/bpf/stream.c:177 [inline] > __bpf_stream_push_str+0x3db/0xc90 kernel/bpf/stream.c:190 > bpf_stream_stage_printk+0x14e/0x1c0 kernel/bpf/stream.c:448 > dump_stack_cb+0x2b6/0x350 kernel/bpf/stream.c:505 > arch_bpf_stack_walk+0xe2/0x170 arch/x86/net/bpf_jit_comp.c:3945 > bpf_stream_stage_dump_stack+0x167/0x220 kernel/bpf/stream.c:522 > bpf_prog_report_may_goto_violation+0xcc/0x190 kernel/bpf/core.c:3181 > bpf_check_timed_may_goto+0xaa/0xb0 kernel/bpf/core.c:3199 > arch_bpf_timed_may_goto+0x21/0x40 arch/x86/net/bpf_timed_may_goto.S:40 > bpf_prog_6fd842a53d323cc5+0x53/0x5f > bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline] > __bpf_prog_run include/linux/filter.h:721 [inline] > bpf_prog_run include/linux/filter.h:728 [inline] > __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline] > bpf_trace_run2+0x281/0x4b0 kernel/trace/bpf_trace.c:2116 > __bpf_trace_hrtimer_expire_entry+0x102/0x160 include/trace/events/timer.h:259 > __do_trace_hrtimer_expire_entry include/trace/events/timer.h:259 [inline] > trace_hrtimer_expire_entry include/trace/events/timer.h:259 [inline] > __run_hrtimer kernel/time/hrtimer.c:1774 [inline] > __hrtimer_run_queues+0xa03/0xc60 kernel/time/hrtimer.c:1841 > hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] > __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1058 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] > sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052 > > > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 > RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] > RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877 > Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 a6 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 51 6f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 35 6f > RSP: 0018:ffffc90010c17760 EFLAGS: 00000287 > RAX: ffffffff81b3ac3b RBX: 1ffff110170e7f69 RCX: 0000000000080000 > RDX: ffffc9001b9a2000 RSI: 00000000000060c8 RDI: 00000000000060c9 > RBP: ffffc90010c178e0 R08: ffffffff8f9d4c37 R09: 1ffffffff1f3a986 > R10: dffffc0000000000 R11: fffffbfff1f3a987 R12: ffff8880b873fb48 > R13: dffffc0000000000 R14: ffff8880b863b200 R15: 0000000000000001 > on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 > on_each_cpu include/linux/smp.h:71 [inline] > smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2653 [inline] > smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2863 > arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 > static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210 > static_key_enable+0x1a/0x20 kernel/jump_label.c:223 > tracepoint_add_func+0x994/0xa10 kernel/tracepoint.c:315 > tracepoint_probe_register_prio_may_exist+0x5f/0xa0 kernel/tracepoint.c:435 > bpf_raw_tp_link_attach+0x4f0/0x6c0 kernel/bpf/syscall.c:4235 > bpf_raw_tracepoint_open+0x1b2/0x220 kernel/bpf/syscall.c:4266 > __sys_bpf+0x73e/0x860 kernel/bpf/syscall.c:6176 > __do_sys_bpf kernel/bpf/syscall.c:6244 [inline] > __se_sys_bpf kernel/bpf/syscall.c:6242 [inline] > __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fe963b8eec9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fe964a02038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 > RAX: ffffffffffffffda RBX: 00007fe963de6090 RCX: 00007fe963b8eec9 > RDX: 0000000000000018 RSI: 00002000000000c0 RDI: 0000000000000011 > RBP: 00007fe963c11f91 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fe963de6128 R14: 00007fe963de6090 R15: 00007ffc809e0088 > > ---------------- > Code disassembly (best guess): > 0: 45 8b 2c 24 mov (%r12),%r13d > 4: 44 89 ee mov %r13d,%esi > 7: 83 e6 01 and $0x1,%esi > a: 31 ff xor %edi,%edi > c: e8 a6 73 0b 00 call 0xb73b7 > 11: 41 83 e5 01 and $0x1,%r13d > 15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 > 1c: fc ff df > 1f: 75 07 jne 0x28 > 21: e8 51 6f 0b 00 call 0xb6f77 > 26: eb 38 jmp 0x60 > 28: f3 90 pause > * 2a: 42 0f b6 04 2b movzbl (%rbx,%r13,1),%eax <-- trapping instruction > 2f: 84 c0 test %al,%al > 31: 75 11 jne 0x44 > 33: 41 f7 04 24 01 00 00 testl $0x1,(%r12) > 3a: 00 > 3b: 74 1e je 0x5b > 3d: e8 .byte 0xe8 > 3e: 35 .byte 0x35 > 3f: 6f outsl %ds:(%rsi),(%dx) > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup