Hi, I am testing the following the program: https://gist.github.com/dvyukov/e5c0a8ef220ef856363c1080b0936a9e on the latest upstream 6642d600b541b81931fb1ab0c041b0d68f77be7e and getting the following crash. Config is: https://gist.github.com/dvyukov/16d9905e5ef35e44285451f1d330ddbc The program updates a bpf map from a program called on hw breakpoint hit. Not sure if it's a bpf issue or a perf issue. This time it is not a fuzzer workload, I am trying to do something useful :) ------------[ cut here ]------------ pvqspinlock: lock 0xffffffff8f371d80 has corrupted value 0x0! WARNING: CPU: 3 PID: 8771 at kernel/locking/qspinlock_paravirt.h:498 __pv_queued_spin_unlock_slowpath+0x22e/0x2b0 kernel/locking/qspinlock_paravirt.h:498 Modules linked in: CPU: 3 PID: 8771 Comm: a.out Not tainted 5.11.0-rc5+ #71 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-44-g88ab0c15525c-prebuilt.qemu.org 04/01/2014 RIP: 0010:__pv_queued_spin_unlock_slowpath+0x22e/0x2b0 kernel/locking/qspinlock_paravirt.h:498 Code: ea 03 0f b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 62 41 8b 55 00 4c 89 ee 48 c7 c7 20 6b 4c 89 e8 72 d3 5f 07 <0f> 0b e9 6cc RSP: 0018:fffffe00000c17b0 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffffffff8f3b5660 RCX: 0000000000000000 RDX: ffff8880150222c0 RSI: ffffffff815b624d RDI: fffffbc0000182e8 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: ffffffff817de94f R11: 0000000000000000 R12: ffff8880150222c0 R13: ffffffff8f371d80 R14: ffff8880181fead8 R15: 0000000000000000 FS: 00007fa5b51f0700(0000) GS:ffff88802cf80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002286908 CR3: 0000000015b24000 CR4: 0000000000750ee0 DR0: 00000000004cb3d4 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <#DB> __raw_callee_save___pv_queued_spin_unlock_slowpath+0x11/0x20 .slowpath+0x9/0xe pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:559 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline] lockdep_unlock+0x10e/0x290 kernel/locking/lockdep.c:124 debug_locks_off_graph_unlock kernel/locking/lockdep.c:165 [inline] print_usage_bug kernel/locking/lockdep.c:3710 [inline] verify_lock_unused kernel/locking/lockdep.c:5374 [inline] lock_acquire kernel/locking/lockdep.c:5433 [inline] lock_acquire+0x471/0x720 kernel/locking/lockdep.c:5407 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 htab_lock_bucket kernel/bpf/hashtab.c:175 [inline] htab_map_update_elem+0x1f0/0x790 kernel/bpf/hashtab.c:1023 bpf_prog_60236c52b8017ad1+0x8e/0xab4 bpf_dispatcher_nop_func include/linux/bpf.h:651 [inline] bpf_overflow_handler+0x192/0x5b0 kernel/events/core.c:9755 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:8979 perf_swevent_overflow kernel/events/core.c:9055 [inline] perf_swevent_event+0x347/0x550 kernel/events/core.c:9083 perf_bp_event+0x1a2/0x1c0 kernel/events/core.c:9932 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:535 [inline] hw_breakpoint_exceptions_notify+0x18a/0x3b0 arch/x86/kernel/hw_breakpoint.c:567 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 atomic_notifier_call_chain+0x8d/0x170 kernel/notifier.c:217 notify_die+0xda/0x170 kernel/notifier.c:548 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:842 exc_debug_kernel arch/x86/kernel/traps.c:902 [inline] exc_debug+0x103/0x140 arch/x86/kernel/traps.c:998 asm_exc_debug+0x19/0x30 arch/x86/include/asm/idtentry.h:598 RIP: 0010:copy_user_generic_unrolled+0xa2/0xc0 arch/x86/lib/copy_user_64.S:102 Code: ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 88 07 <48> ff c6 484 RSP: 0018:ffffc90000d67af0 EFLAGS: 00040202 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000001 RSI: ffff88801341d001 RDI: 00000000004cb3d4 RBP: 00000000004cb3d4 R08: 0000000000000000 R09: ffff88801341d001 R10: ffffed1002683a00 R11: 0000000000000000 R12: ffff88801341d001 R13: 00000000004cb3d5 R14: 0000000000000000 R15: 0000000000000001 </#DB> copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] copyout.part.0+0xe4/0x110 lib/iov_iter.c:148 copyout lib/iov_iter.c:182 [inline] copy_page_to_iter_iovec lib/iov_iter.c:219 [inline] copy_page_to_iter+0x416/0xed0 lib/iov_iter.c:926 pipe_read+0x4a4/0x13a0 fs/pipe.c:290 call_read_iter include/linux/fs.h:1895 [inline] new_sync_read+0x5b7/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x1ee/0x250 fs/read_write.c:634 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x406c1c Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f08 RSP: 002b:00007fa5b51f02d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000000004cb3d4 RCX: 0000000000406c1c RDX: 0000000000000001 RSI: 00000000004cb3d4 RDI: 0000000000000004 RBP: 00007fa5b51f030c R08: 0000000000000000 R09: 0000000000000000 R10: 00007fa5b51f0700 R11: 0000000000000246 R12: 00000000004cb3d0 R13: cccccccccccccccd R14: 00007fa5b51f0400 R15: 0000000000802000
