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AJvYcCVkx2ksFnuLEu7U1GKap00zPfoKlcXDLkgfunoXpt6s0N4ssDBe6hZRa88+PctZF99OMz+j/gwKkbvnxJweow312J0= X-Gm-Message-State: AOJu0YzNxDX6FNdffy38eO5Wk01parC583UhXptb8X26c/6dGorBPEkv H6u9lH2c7LI+sA35+raDUwGfdI5jlTkO04JeypjHDTmpMfd39g5qSkQPxR4rhk7ySnUTGjjt3O3 vnx11Ha4sLsxMjAG6n9FmazGgmfk= X-Google-Smtp-Source: AGHT+IHNE4gaCBTlJ6Sf/cqNINe8TvWqiG0aBUbIQKuaZ6WnvS0rVqHd6cxqfvofKLdBvRbPhira79fIXUFcm9BIfQc= X-Received: by 2002:a5d:4e8f:0:b0:343:8176:9861 with SMTP id e15-20020a5d4e8f000000b0034381769861mr492880wru.33.1712269348396; Thu, 04 Apr 2024 15:22:28 -0700 (PDT) MIME-Version: 1.0 References: <000000000000c98e7d06153a5177@google.com> <20240404143142.9e99f7127703892cb3166d64@linux-foundation.org> In-Reply-To: <20240404143142.9e99f7127703892cb3166d64@linux-foundation.org> From: Alexei Starovoitov Date: Thu, 4 Apr 2024 15:22:17 -0700 Message-ID: Subject: Re: [syzbot] [mm?] inconsistent lock state in __mmap_lock_do_trace_acquire_returned To: Andrew Morton , Song Liu Cc: syzbot , LKML , linux-mm , syzkaller-bugs , bpf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 23387A0009 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: i5337q7q4u3eqp64oaq55xuzjoj5cf1y X-HE-Tag: 1712269349-587602 X-HE-Meta: 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 Adk8R1AM 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 DW+t6thl ZdhTXkCVSiIWmPwRRh68IT+CnVAsiAuEqlfNnLgi1HHUywMtdfaYLDV1AmYxACsIAJJMOKV/vgBsp72F8aYQ4nPgs9dQlC09U0/i2Y55yRIbfuwGxvjK/t14gZcarWLCUbBUX41WqOPnHtXPyBGKi1ZIbr6GzdNt/coo1y2kzfPy3J7q2/eQnZGe66LPO3STxLiAm0nBMl9s7R7nC6yJGzGv3ogHUE5s7sf+sV9Asu0= 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, Apr 4, 2024 at 2:31=E2=80=AFPM Andrew Morton wrote: > > On Wed, 03 Apr 2024 17:21:24 -0700 syzbot wrote: > > > Hello, > > Thanks. I think this is due to BPF playing with mmap_lock from timer > context. Cc added. Looks like lockdep false positive. bpf side is doing mmap_read_trylock for that very reason. Adding Song, in case he sees something I don't. > > syzbot found the following issue on: > > > > HEAD commit: fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.ker= nel.. > > git tree: upstream > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=3D132e732d180= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Daef2a55903e= 5791c > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D76f802bc1dee8= ba28a6e > > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for= Debian) 2.40 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D16d61b761= 80000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D166ee109180= 000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/089e25869df5/d= isk-fe46a7dd.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/423b1787914f/vmli= nux-fe46a7dd.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/4c043e30c07d= /bzImage-fe46a7dd.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the co= mmit: > > Reported-by: syzbot+76f802bc1dee8ba28a6e@syzkaller.appspotmail.com > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D > > WARNING: inconsistent lock state > > 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted > > -------------------------------- > > inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. > > syz-executor244/5087 [HC0[0]:SC1[1]:HE0:SE0] takes: > > ffff8880b9538780 (lock#9){+.?.}-{2:2}, at: local_lock_acquire include/l= inux/local_lock_internal.h:29 [inline] > > ffff8880b9538780 (lock#9){+.?.}-{2:2}, at: __mmap_lock_do_trace_acquire= _returned+0x7f/0x760 mm/mmap_lock.c:237 > > {SOFTIRQ-ON-W} state was registered at: > > lock_acquire kernel/locking/lockdep.c:5754 [inline] > > lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 > > local_lock_acquire include/linux/local_lock_internal.h:29 [inline] > > __mmap_lock_do_trace_acquire_returned+0x97/0x760 mm/mmap_lock.c:237 > > __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inli= ne] > > mmap_read_lock include/linux/mmap_lock.h:147 [inline] > > process_vm_rw_single_vec mm/process_vm_access.c:105 [inline] > > process_vm_rw_core.constprop.0+0x7d7/0xa10 mm/process_vm_access.c:216 > > process_vm_rw+0x301/0x360 mm/process_vm_access.c:284 > > __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline] > > __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline] > > __x64_sys_process_vm_readv+0xe2/0x1c0 mm/process_vm_access.c:292 > > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > > do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 > > entry_SYSCALL_64_after_hwframe+0x6d/0x75 > > irq event stamp: 997 > > hardirqs last enabled at (996): [] __do_softirq+0x1d= 6/0x8de kernel/softirq.c:538 > > hardirqs last disabled at (997): [] __raw_spin_lock_i= rq include/linux/spinlock_api_smp.h:117 [inline] > > hardirqs last disabled at (997): [] _raw_spin_lock_ir= q+0x45/0x50 kernel/locking/spinlock.c:170 > > softirqs last enabled at (896): [] spin_unlock_bh in= clude/linux/spinlock.h:396 [inline] > > softirqs last enabled at (896): [] bpf_link_settle k= ernel/bpf/syscall.c:3181 [inline] > > softirqs last enabled at (896): [] bpf_raw_tp_link_a= ttach+0x35f/0x610 kernel/bpf/syscall.c:3842 > > softirqs last disabled at (995): [] invoke_softirq ke= rnel/softirq.c:428 [inline] > > softirqs last disabled at (995): [] __irq_exit_rcu ke= rnel/softirq.c:633 [inline] > > softirqs last disabled at (995): [] irq_exit_rcu+0xb9= /0x120 kernel/softirq.c:645 > > > > other info that might help us debug this: > > Possible unsafe locking scenario: > > > > CPU0 > > ---- > > lock(lock#9); > > > > lock(lock#9); > > > > *** DEADLOCK *** > > > > 6 locks held by syz-executor244/5087: > > #0: ffff88802247b1e8 (&tsk->futex_exit_mutex){+.+.}-{3:3}, at: futex_c= leanup_begin kernel/futex/core.c:1091 [inline] > > #0: ffff88802247b1e8 (&tsk->futex_exit_mutex){+.+.}-{3:3}, at: futex_e= xit_release+0x2a/0x220 kernel/futex/core.c:1143 > > #1: ffffc90000a08cb0 (&(&ipvs->defense_work)->timer){..-.}-{0:0}, at: = call_timer_fn+0x11a/0x5b0 kernel/time/timer.c:1789 > > #2: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire= include/linux/rcupdate.h:298 [inline] > > #2: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock in= clude/linux/rcupdate.h:750 [inline] > > #2: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xf= 2/0x1170 kernel/workqueue.c:2324 > > #3: ffff8880b953d5d8 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x39e= /0x1170 kernel/workqueue.c:2360 > > #4: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire= include/linux/rcupdate.h:298 [inline] > > #4: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock in= clude/linux/rcupdate.h:750 [inline] > > #4: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run = kernel/trace/bpf_trace.c:2380 [inline] > > #4: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run3+0= xf8/0x440 kernel/trace/bpf_trace.c:2421 > > #5: ffff88807965b120 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylo= ck include/linux/mmap_lock.h:165 [inline] > > #5: ffff88807965b120 (&mm->mmap_lock){++++}-{3:3}, at: stack_map_get_b= uild_id_offset+0x1e8/0x7d0 kernel/bpf/stackmap.c:141 > > > > stack backtrace: > > CPU: 1 PID: 5087 Comm: syz-executor244 Not tainted 6.8.0-syzkaller-0895= 1-gfe46a7dd189e #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS= Google 03/27/2024 > > Call Trace: > > > > __dump_stack lib/dump_stack.c:88 [inline] > > dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 > > print_usage_bug kernel/locking/lockdep.c:3971 [inline] > > valid_state kernel/locking/lockdep.c:4013 [inline] > > mark_lock_irq kernel/locking/lockdep.c:4216 [inline] > > mark_lock+0x923/0xc60 kernel/locking/lockdep.c:4678 > > mark_usage kernel/locking/lockdep.c:4567 [inline] > > __lock_acquire+0x13d4/0x3b30 kernel/locking/lockdep.c:5091 > > lock_acquire kernel/locking/lockdep.c:5754 [inline] > > lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 > > local_lock_acquire include/linux/local_lock_internal.h:29 [inline] > > __mmap_lock_do_trace_acquire_returned+0x97/0x760 mm/mmap_lock.c:237 > > __mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inlin= e] > > mmap_read_trylock include/linux/mmap_lock.h:166 [inline] > > stack_map_get_build_id_offset+0x5df/0x7d0 kernel/bpf/stackmap.c:141 > > __bpf_get_stack+0x6bf/0x700 kernel/bpf/stackmap.c:449 > > ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1985 [inline] > > bpf_get_stack_raw_tp+0x124/0x160 kernel/trace/bpf_trace.c:1975 > > ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 > > __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 > > bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] > > __bpf_prog_run include/linux/filter.h:657 [inline] > > bpf_prog_run include/linux/filter.h:664 [inline] > > __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] > > bpf_trace_run3+0x167/0x440 kernel/trace/bpf_trace.c:2421 > > __bpf_trace_workqueue_queue_work+0x101/0x140 include/trace/events/work= queue.h:23 > > __traceiter_workqueue_queue_work+0x6c/0xc0 include/trace/events/workqu= eue.h:23 > > trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline= ] > > __queue_work+0x627/0x1170 kernel/workqueue.c:2382 > > call_timer_fn+0x1a0/0x5b0 kernel/time/timer.c:1792 > > expire_timers kernel/time/timer.c:1838 [inline] > > __run_timers+0x567/0xab0 kernel/time/timer.c:2408 > > __run_timer_base kernel/time/timer.c:2419 [inline] > > __run_timer_base kernel/time/timer.c:2412 [inline] > > run_timer_base+0x111/0x190 kernel/time/timer.c:2428 > > run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2438 > > __do_softirq+0x218/0x8de kernel/softirq.c:554 > > invoke_softirq kernel/softirq.c:428 [inline] > > __irq_exit_rcu kernel/softirq.c:633 [inline] > > irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 > > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [in= line] > > sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 > > > > > > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentr= y.h:702 > > RIP: 0010:lock_acquire+0x1f2/0x540 kernel/locking/lockdep.c:5722 > > Code: c1 05 ea 37 97 7e 83 f8 01 0f 85 c8 02 00 00 9c 58 f6 c4 02 0f 85= b3 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 = c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 > > RSP: 0018:ffffc90003457ba0 EFLAGS: 00000206 > > RAX: dffffc0000000000 RBX: 1ffff9200068af76 RCX: ffffffff816a5d5e > > RDX: 0000000000000001 RSI: ffffffff8b0cba40 RDI: ffffffff8b6e88a0 > > RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff27b4e38 > > R10: ffffffff93da71c7 R11: 0000000000000000 R12: 0000000000000001 > > R13: 0000000000000000 R14: ffff88802247b1e8 R15: 0000000000000000 > > __mutex_lock_common kernel/locking/mutex.c:608 [inline] > > __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 > > futex_cleanup_begin kernel/futex/core.c:1091 [inline] > > futex_exit_release+0x2a/0x220 kernel/futex/core.c:1143 > > exit_mm_release+0x19/0x30 kernel/fork.c:1652 > > exit_mm kernel/exit.c:542 [inline] > > do_exit+0x865/0x2be0 kernel/exit.c:865 > > do_group_exit+0xd3/0x2a0 kernel/exit.c:1027 > > __do_sys_exit_group kernel/exit.c:1038 [inline] > > __se_sys_exit_group kernel/exit.c:1036 [inline] > > __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1036 > > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > > do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 > > entry_SYSCALL_64_after_hwframe+0x6d/0x75 > > RIP: 0033:0x7f44f7223a79 > > Code: 90 49 c7 c0 b8 ff ff ff be e7 00 00 00 ba 3c 00 00 00 eb 12 0f 1f= 44 00 00 89 d0 0f 05 48 3d 00 f0 ff ff 77 1c f4 89 f0 0f 05 <48> 3d 00 f0 = ff ff 76 e7 f7 d8 64 41 89 00 eb df 0f 1f 80 00 00 00 > > RSP: 002b:00007ffd5c6574d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f44f7223a79 > > RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 > > RBP: 00007f44f729e2b0 R08: ffffffffffffffb8 R09: 00000000000f4240 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f44f729e2b0 > > R13: 0000000000000000 R14: 00007f44f729ed20 R15: 00007f44f71f4700 > > > > ---------------- > > Code disassembly (best guess): > > 0: c1 05 ea 37 97 7e 83 roll $0x83,0x7e9737ea(%rip) # 0x= 7e9737f1 > > 7: f8 clc > > 8: 01 0f add %ecx,(%rdi) > > a: 85 c8 test %ecx,%eax > > c: 02 00 add (%rax),%al > > e: 00 9c 58 f6 c4 02 0f add %bl,0xf02c4f6(%rax,%rbx,2) > > 15: 85 b3 02 00 00 48 test %esi,0x48000002(%rbx) > > 1b: 85 ed test %ebp,%ebp > > 1d: 74 01 je 0x20 > > 1f: fb sti > > 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > > 27: fc ff df > > * 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction > > 2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) > > 34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx) > > 3b: 00 > > 3c: 48 rex.W > > 3d: 8b .byte 0x8b > > 3e: 84 .byte 0x84 > > 3f: 24 .byte 0x24 > > > > > > --- > > This report is generated by a bot. 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