======================================================== WARNING: possible irq lock inversion dependency detected 6.4.0-rc7-next-20230621 #1 Not tainted -------------------------------------------------------- ksoftirqd/1/19 just changed the state of lock: ffffffff85814e18 (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 *** 2 locks held by ksoftirqd/1/19: #0: ffffffff8560b520 (rcu_callback){....}-{0:0}, at: rcu_core+0x83e/0x2860 #1: ffffffff8560b640 (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 write_comp_data+0x3c/0x90 vsnprintf+0x370/0x1650 seq_printf+0x19d/0x250 cgroup_procs_show+0x2f/0x40 cgroup_seqfile_show+0x1ad/0x310 seq_read_iter+0xbe2/0x1300 kernfs_fop_read_iter+0x4d4/0x690 vfs_read+0x4b5/0x8f0 ksys_read+0x122/0x250 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 __mod_memcg_lruvec_state+0x18d/0x2b0 mod_objcg_mlstate+0x119/0x230 drain_obj_stock+0x125/0x580 refill_obj_stock+0x12d/0x5c0 kmem_cache_free+0x444/0x4d0 file_free_rcu+0xb5/0x100 rcu_core+0x8c8/0x2860 __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 flush_memcg_stats_dwork+0x9/0x50 process_one_work+0xabf/0x1770 worker_thread+0x64f/0x12a0 kthread+0x33f/0x440 ret_from_fork+0x2c/0x50 -> (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+0x8c8/0x2860 __do_softirq+0x1b7/0x7d4 run_ksoftirqd+0x29/0x50 smpboot_thread_fn+0x40b/0x930 kthread+0x33f/0x440 ret_from_fork+0x2c/0x50 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+0x8c8/0x2860 __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+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 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: [] 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+0x8c8/0x2860 __do_softirq+0x1b7/0x7d4 run_ksoftirqd+0x29/0x50 smpboot_thread_fn+0x40b/0x930 kthread+0x33f/0x440 ret_from_fork+0x2c/0x50 stack backtrace: CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 6.4.0-rc7-next-20230621 #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+0x8c8/0x2860 __do_softirq+0x1b7/0x7d4 run_ksoftirqd+0x29/0x50 smpboot_thread_fn+0x40b/0x930 kthread+0x33f/0x440 ret_from_fork+0x2c/0x50 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=6981 comm=syz-executor.2 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7005 Comm: syz-executor.4 Not tainted 6.4.0-rc7-next-20230621 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xc1/0xf0 should_fail_ex+0x4b4/0x5b0 should_failslab+0x9/0x20 kmem_cache_alloc_lru+0x7a/0x680 __d_alloc+0x31/0x9c0 d_alloc+0x4a/0x1d0 __rpc_lookup_create_exclusive+0x11c/0x140 rpc_populate.constprop.0+0xb0/0x550 rpc_fill_super+0x245/0x7b0 vfs_get_super+0xf0/0x280 vfs_get_tree+0x92/0x360 __do_sys_fsconfig+0x8fb/0xc60 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x7ff66e700b19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff66bc76188 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007ff66e813f60 RCX: 00007ff66e700b19 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 RBP: 00007ff66bc761d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffd1d28d61f R14: 00007ff66bc76300 R15: 0000000000022000 net/sunrpc/rpc_pipe.c: rpc_populate failed to populate directory /