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Message-ID: <687e50ca.a70a0220.693ce.00ed.GAE@google.com> Date: Mon, 21 Jul 2025 07:38:02 -0700 From: syzbot <syzbot+ab13429207fe1c8c92e8@...kaller.appspotmail.com> To: dhowells@...hat.com, linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, marc.dionne@...istor.com, mathieu.desnoyers@...icios.com, mhiramat@...nel.org, rostedt@...dmis.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [afs?] WARNING: ODEBUG bug in delete_node (3) Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING: ODEBUG bug in delete_node ------------[ cut here ]------------ ODEBUG: activate active (active state 0) object: ffff888148ef4dd8 object type: rcu_head hint: 0x0 WARNING: CPU: 1 PID: 6466 at lib/debugobjects.c:615 debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612 Modules linked in: CPU: 1 UID: 0 PID: 6466 Comm: syz-executor Not tainted 6.16.0-rc7-syzkaller-g89be9a83ccf1 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612 Code: 4c 89 ff e8 e7 83 60 fd 4d 8b 0f 48 c7 c7 80 d1 e1 8b 48 8b 34 24 4c 89 ea 89 e9 4d 89 f0 41 54 e8 3a 0d c3 fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 f7 30 de 0a 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 RSP: 0018:ffffc90000a088e0 EFLAGS: 00010292 RAX: 3ffe616a0f195300 RBX: dffffc0000000000 RCX: ffff88802d3a1e00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002 RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfaa6c R12: 0000000000000000 R13: ffffffff8be1d300 R14: ffff888148ef4dd8 R15: ffffffff8b8bde80 FS: 000055556b314500(0000) GS:ffff888125da5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f26e42d56c0 CR3: 00000000342c0000 CR4: 00000000003526f0 Call Trace: <IRQ> debug_object_activate+0x26a/0x420 lib/debugobjects.c:842 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline] __call_rcu_common kernel/rcu/tree.c:3079 [inline] call_rcu+0xaa/0x9c0 kernel/rcu/tree.c:3214 radix_tree_node_free lib/radix-tree.c:310 [inline] delete_node+0x1b6/0xa50 lib/radix-tree.c:573 radix_tree_delete_item+0x2b6/0x400 lib/radix-tree.c:1430 afs_cell_destroy+0x16f/0x2c0 fs/afs/cell.c:522 rcu_do_batch kernel/rcu/tree.c:2576 [inline] rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2832 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_preemption_disabled+0x17/0x120 lib/smp_processor_id.c:14 Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 48 83 ec 10 65 48 8b 05 ee 4d 3b 07 48 89 44 24 08 <65> 8b 05 f6 4d 3b 07 65 8b 0d eb 4d 3b 07 f7 c1 ff ff ff 7f 74 23 RSP: 0018:ffffc90003def330 EFLAGS: 00000286 RAX: 3ffe616a0f195300 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff88802d3a1e00 RSI: ffffffff8be1c7c0 RDI: ffffffff8be1c780 RBP: ffff88801e0ffe10 R08: ffff88801e0ffe0b R09: 1ffff11003c1ffc1 R10: dffffc0000000000 R11: ffffed1003c1ffc2 R12: ffffffff822c91ad R13: 0000000000000001 R14: 000000000007332c R15: 0000000000000001 rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:745 rcu_read_unlock include/linux/rcupdate.h:869 [inline] page_table_check_set+0x4ad/0x730 mm/page_table_check.c:124 page_table_check_ptes_set include/linux/page_table_check.h:76 [inline] set_ptes include/linux/pgtable.h:292 [inline] __copy_present_ptes mm/memory.c:973 [inline] copy_present_ptes mm/memory.c:1056 [inline] copy_pte_range mm/memory.c:1179 [inline] copy_pmd_range+0x4262/0x7000 mm/memory.c:1267 copy_pud_range mm/memory.c:1304 [inline] copy_p4d_range mm/memory.c:1328 [inline] copy_page_range+0xc46/0x1270 mm/memory.c:1416 dup_mmap+0xf57/0x1ac0 mm/mmap.c:1838 dup_mm kernel/fork.c:1477 [inline] copy_mm+0x13c/0x4b0 kernel/fork.c:1529 copy_process+0x16d3/0x3b80 kernel/fork.c:2169 kernel_clone+0x224/0x7f0 kernel/fork.c:2599 __do_sys_clone kernel/fork.c:2742 [inline] __se_sys_clone kernel/fork.c:2726 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f26e35839d3 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007fff070e2f88 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f26e35839d3 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 000055556b3147d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 0000000000070948 R15: 00007fff070e3120 </TASK> ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax) 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: 55 push %rbp 14: 41 57 push %r15 16: 41 56 push %r14 18: 53 push %rbx 19: 48 83 ec 10 sub $0x10,%rsp 1d: 65 48 8b 05 ee 4d 3b mov %gs:0x73b4dee(%rip),%rax # 0x73b4e13 24: 07 25: 48 89 44 24 08 mov %rax,0x8(%rsp) * 2a: 65 8b 05 f6 4d 3b 07 mov %gs:0x73b4df6(%rip),%eax # 0x73b4e27 <-- trapping instruction 31: 65 8b 0d eb 4d 3b 07 mov %gs:0x73b4deb(%rip),%ecx # 0x73b4e23 38: f7 c1 ff ff ff 7f test $0x7fffffff,%ecx 3e: 74 23 je 0x63 Tested on: commit: 89be9a83 Linux 6.16-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16517722580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8ba21f95b63d6db2 dashboard link: https://syzkaller.appspot.com/bug?extid=ab13429207fe1c8c92e8 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 Note: no patches were applied.
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