======================================================== WARNING: possible irq lock inversion dependency detected 6.4.0-rc7-next-20230623 #1 Not tainted -------------------------------------------------------- syz-executor.3/9786 just changed the state of lock: ffffffff85815818 (blkg_stat_lock){+.-.}-{2:2}, at: __blkcg_rstat_flush.isra.0+0x11f/0x4e0 but this lock was taken by another, HARDIRQ-safe lock in the past: (per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu)){-.-.}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(blkg_stat_lock); local_irq_disable(); lock(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu)); lock(blkg_stat_lock); lock(per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu)); *** DEADLOCK *** 3 locks held by syz-executor.3/9786: #0: ffff888017be9d60 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0xf6/0x8d0 #1: ffffffff8560b5a0 (rcu_callback){....}-{0:0}, at: rcu_core+0x83e/0x28b0 #2: ffffffff8560b6c0 (rcu_read_lock){....}-{1:2}, at: __blkcg_rstat_flush.isra.0+0x93/0x4e0 the shortest dependencies between 2nd lock and 1st lock: -> (per_cpu_ptr(&cgroup_rstat_cpu_lock, cpu)){-.-.}-{2:2} { IN-HARDIRQ-W at: lock_acquire+0x19a/0x4c0 _raw_spin_lock_irqsave+0x3a/0x60 cgroup_rstat_updated+0xcb/0x2e0 __cgroup_account_cputime_field+0xa0/0x120 account_system_index_time+0x199/0x2c0 update_process_times+0x26/0x150 tick_sched_handle+0x8e/0x170 tick_sched_timer+0xe6/0x110 __hrtimer_run_queues+0x17f/0xb60 hrtimer_interrupt+0x2ef/0x750 __sysvec_apic_timer_interrupt+0xff/0x380 sysvec_apic_timer_interrupt+0x69/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 core_kernel_text+0x82/0xa0 kernel_text_address+0x11/0xc0 __kernel_text_address+0xd/0x40 unwind_get_return_address+0x59/0xa0 arch_stack_walk+0x9d/0xf0 stack_trace_save+0x90/0xd0 kasan_save_stack+0x22/0x50 kasan_set_track+0x25/0x30 __kasan_slab_alloc+0x59/0x70 kmem_cache_alloc+0x16b/0x370 __create_object+0x3c/0xc90 kmem_cache_alloc+0x20b/0x370 getname_flags.part.0+0x50/0x4f0 getname+0x92/0xe0 do_sys_openat2+0xec/0x1d0 __x64_sys_openat+0x143/0x200 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 IN-SOFTIRQ-W at: lock_acquire+0x19a/0x4c0 _raw_spin_lock_irqsave+0x3a/0x60 cgroup_rstat_updated+0xcb/0x2e0 __cgroup_account_cputime+0x75/0xc0 update_curr+0x350/0x6d0 dequeue_task_fair+0x20e/0x14a0 load_balance+0xcb4/0x2790 rebalance_domains+0x66c/0xc00 __do_softirq+0x1b7/0x7d4 run_ksoftirqd+0x29/0x50 smpboot_thread_fn+0x40b/0x930 kthread+0x33f/0x440 ret_from_fork+0x2c/0x50 INITIAL USE at: lock_acquire+0x19a/0x4c0 _raw_spin_lock_irqsave+0x3a/0x60 cgroup_rstat_flush_locked+0x131/0xd80 cgroup_rstat_flush+0x37/0x50 do_flush_stats+0x97/0xf0 flush_memcg_stats_dwork+0x9/0x50 process_one_work+0xabf/0x1770 worker_thread+0x64f/0x12a0 kthread+0x33f/0x440 ret_from_fork+0x2c/0x50 } ... key at: [] __key.0+0x0/0x40 ... acquired at: _raw_spin_lock+0x2b/0x40 __blkcg_rstat_flush.isra.0+0x11f/0x4e0 blkcg_rstat_flush+0x87/0xb0 cgroup_rstat_flush_locked+0x706/0xd80 cgroup_rstat_flush+0x37/0x50 do_flush_stats+0x97/0xf0 mem_cgroup_wb_stats+0x3d8/0x4b0 balance_dirty_pages+0x339/0x2640 balance_dirty_pages_ratelimited_flags+0xbce/0x1130 fault_dirty_shared_page+0x2b3/0x500 do_wp_page+0x3c8/0x3b00 __handle_mm_fault+0xcbc/0x2d20 handle_mm_fault+0x1af/0xba0 do_user_addr_fault+0x58e/0x12f0 exc_page_fault+0x9c/0x1a0 asm_exc_page_fault+0x26/0x30 -> (blkg_stat_lock){+.-.}-{2:2} { HARDIRQ-ON-W at: lock_acquire+0x19a/0x4c0 _raw_spin_lock+0x2b/0x40 __blkcg_rstat_flush.isra.0+0x11f/0x4e0 __blkg_release+0xfa/0x3b0 rcu_core+0x8c8/0x28b0 __do_softirq+0x1b7/0x7d4 irq_exit_rcu+0x93/0xc0 sysvec_apic_timer_interrupt+0x6e/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 __sanitizer_cov_trace_pc+0x3b/0x70 release_pages+0x1fd/0x1040 tlb_batch_pages_flush+0xa8/0x1b0 unmap_page_range+0x18f1/0x2860 unmap_single_vma+0x19a/0x2b0 unmap_vmas+0x233/0x390 exit_mmap+0x16a/0x8d0 mmput+0xd5/0x390 do_exit+0x99f/0x2740 do_group_exit+0xd4/0x2a0 get_signal+0x263f/0x26c0 arch_do_signal_or_restart+0x79/0x590 exit_to_user_mode_prepare+0xeb/0x180 syscall_exit_to_user_mode+0x1d/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 IN-SOFTIRQ-W at: lock_acquire+0x19a/0x4c0 _raw_spin_lock+0x2b/0x40 __blkcg_rstat_flush.isra.0+0x11f/0x4e0 __blkg_release+0xfa/0x3b0 rcu_core+0x8c8/0x28b0 __do_softirq+0x1b7/0x7d4 irq_exit_rcu+0x93/0xc0 sysvec_apic_timer_interrupt+0x6e/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 __sanitizer_cov_trace_pc+0x3b/0x70 release_pages+0x1fd/0x1040 tlb_batch_pages_flush+0xa8/0x1b0 unmap_page_range+0x18f1/0x2860 unmap_single_vma+0x19a/0x2b0 unmap_vmas+0x233/0x390 exit_mmap+0x16a/0x8d0 mmput+0xd5/0x390 do_exit+0x99f/0x2740 do_group_exit+0xd4/0x2a0 get_signal+0x263f/0x26c0 arch_do_signal_or_restart+0x79/0x590 exit_to_user_mode_prepare+0xeb/0x180 syscall_exit_to_user_mode+0x1d/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 INITIAL USE at: lock_acquire+0x19a/0x4c0 _raw_spin_lock+0x2b/0x40 __blkcg_rstat_flush.isra.0+0x11f/0x4e0 blkcg_rstat_flush+0x87/0xb0 cgroup_rstat_flush_locked+0x706/0xd80 cgroup_rstat_flush+0x37/0x50 do_flush_stats+0x97/0xf0 mem_cgroup_wb_stats+0x3d8/0x4b0 balance_dirty_pages+0x339/0x2640 balance_dirty_pages_ratelimited_flags+0xbce/0x1130 fault_dirty_shared_page+0x2b3/0x500 do_wp_page+0x3c8/0x3b00 __handle_mm_fault+0xcbc/0x2d20 handle_mm_fault+0x1af/0xba0 do_user_addr_fault+0x58e/0x12f0 exc_page_fault+0x9c/0x1a0 asm_exc_page_fault+0x26/0x30 } ... key at: [] blkg_stat_lock+0x18/0x60 ... acquired at: __lock_acquire+0x8b8/0x6340 lock_acquire+0x19a/0x4c0 _raw_spin_lock+0x2b/0x40 __blkcg_rstat_flush.isra.0+0x11f/0x4e0 __blkg_release+0xfa/0x3b0 rcu_core+0x8c8/0x28b0 __do_softirq+0x1b7/0x7d4 irq_exit_rcu+0x93/0xc0 sysvec_apic_timer_interrupt+0x6e/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 __sanitizer_cov_trace_pc+0x3b/0x70 release_pages+0x1fd/0x1040 tlb_batch_pages_flush+0xa8/0x1b0 unmap_page_range+0x18f1/0x2860 unmap_single_vma+0x19a/0x2b0 unmap_vmas+0x233/0x390 exit_mmap+0x16a/0x8d0 mmput+0xd5/0x390 do_exit+0x99f/0x2740 do_group_exit+0xd4/0x2a0 get_signal+0x263f/0x26c0 arch_do_signal_or_restart+0x79/0x590 exit_to_user_mode_prepare+0xeb/0x180 syscall_exit_to_user_mode+0x1d/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 stack backtrace: CPU: 1 PID: 9786 Comm: syz-executor.3 Not tainted 6.4.0-rc7-next-20230623 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x91/0xf0 print_irq_inversion_bug.part.0+0x3d5/0x570 mark_lock.part.0+0x900/0x2f50 __lock_acquire+0x8b8/0x6340 lock_acquire+0x19a/0x4c0 _raw_spin_lock+0x2b/0x40 __blkcg_rstat_flush.isra.0+0x11f/0x4e0 __blkg_release+0xfa/0x3b0 rcu_core+0x8c8/0x28b0 __do_softirq+0x1b7/0x7d4 irq_exit_rcu+0x93/0xc0 sysvec_apic_timer_interrupt+0x6e/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x70 Code: 81 e1 00 01 00 00 65 48 8b 14 25 c0 8a 03 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 9c 14 00 00 85 c0 74 2b 8b 82 78 14 00 00 <83> f8 02 75 20 48 8b 8a 80 14 00 00 8b 92 7c 14 00 00 48 8b 01 48 RSP: 0018:ffff8880428df560 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffea0000cd2e80 RCX: 0000000000000000 RDX: ffff888042e91b40 RSI: ffffffff81667b0d RDI: 0000000000000007 RBP: ffff88803d04d320 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000062 R15: ffffea0000cd2e80 release_pages+0x1fd/0x1040 tlb_batch_pages_flush+0xa8/0x1b0 unmap_page_range+0x18f1/0x2860 unmap_single_vma+0x19a/0x2b0 unmap_vmas+0x233/0x390 exit_mmap+0x16a/0x8d0 mmput+0xd5/0x390 do_exit+0x99f/0x2740 do_group_exit+0xd4/0x2a0 get_signal+0x263f/0x26c0 arch_do_signal_or_restart+0x79/0x590 exit_to_user_mode_prepare+0xeb/0x180 syscall_exit_to_user_mode+0x1d/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x7f43c14efb19 Code: Unable to access opcode bytes at 0x7f43c14efaef. RSP: 002b:00007f43bea65218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f43c1602f68 RCX: 00007f43c14efb19 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f43c1602f68 RBP: 00007f43c1602f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f43c1602f6c R13: 00007ffc84b40ddf R14: 00007f43bea65300 R15: 0000000000022000 loop2: detected capacity change from 0 to 3520 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root loop2: detected capacity change from 0 to 3520 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: changing to secondary root EXT4-fs: Invalid want_extra_isize 0 EXT4-fs: Invalid want_extra_isize 0 EXT4-fs: Invalid want_extra_isize 0 EXT4-fs: Invalid want_extra_isize 0 EXT4-fs: Invalid want_extra_isize 0 loop7: detected capacity change from 0 to 328 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop7: detected capacity change from 0 to 328 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop7: detected capacity change from 0 to 328 loop6: detected capacity change from 0 to 63 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop6: detected capacity change from 0 to 63 loop6: detected capacity change from 0 to 63 loop7: detected capacity change from 0 to 328 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop6: detected capacity change from 0 to 63 loop6: detected capacity change from 0 to 63 ---------------- Code disassembly (best guess): 0: 81 e1 00 01 00 00 and $0x100,%ecx 6: 65 48 8b 14 25 c0 8a mov %gs:0x38ac0,%rdx d: 03 00 f: a9 00 01 ff 00 test $0xff0100,%eax 14: 74 0e je 0x24 16: 85 c9 test %ecx,%ecx 18: 74 35 je 0x4f 1a: 8b 82 9c 14 00 00 mov 0x149c(%rdx),%eax 20: 85 c0 test %eax,%eax 22: 74 2b je 0x4f 24: 8b 82 78 14 00 00 mov 0x1478(%rdx),%eax * 2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction 2d: 75 20 jne 0x4f 2f: 48 8b 8a 80 14 00 00 mov 0x1480(%rdx),%rcx 36: 8b 92 7c 14 00 00 mov 0x147c(%rdx),%edx 3c: 48 8b 01 mov (%rcx),%rax 3f: 48 rex.W