sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer ======================================================== WARNING: possible irq lock inversion dependency detected 6.4.0-rc7-next-20230623 #1 Not tainted -------------------------------------------------------- syz-executor.6/6256 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 *** 5 locks held by syz-executor.6/6256: #0: ffffffff87b85530 (&pmus_srcu){.+.+}-{0:0}, at: perf_event_alloc.part.0+0xcd2/0x3a30 #1: ffffffff85653808 (kprobe_mutex){+.+.}-{3:3}, at: register_kprobe+0x327/0x1580 #2: ffffffff854e2d50 (cpu_hotplug_lock){++++}-{0:0}, at: register_kprobe+0xba9/0x1580 #3: ffffffff8560b5a0 (rcu_callback){....}-{0:0}, at: rcu_core+0x83e/0x28b0 #4: 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 _raw_spin_unlock_irqrestore+0x34/0x50 __wake_up_common_lock+0xe5/0x140 d_splice_alias+0x4c3/0xe30 kernfs_iop_lookup+0x283/0x330 lookup_open.isra.0+0x745/0x1400 path_openat+0x96c/0x2710 do_filp_open+0x1ba/0x410 do_sys_openat2+0x164/0x1d0 __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 __mod_memcg_state+0x86/0x160 memcg_account_kmem+0x38/0x70 refill_obj_stock+0x35f/0x5c0 kmem_cache_free+0x444/0x4d0 file_free_rcu+0xb5/0x100 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 unwind_next_frame+0x1aa/0x2490 arch_stack_walk+0x87/0xf0 stack_trace_save+0x90/0xd0 kasan_save_stack+0x22/0x50 __kasan_record_aux_stack+0x8e/0xa0 __call_rcu_common.constprop.0+0x6a/0xbd0 kmem_cache_free+0xc1/0x4d0 mt_destroy_walk+0xb1/0x1200 __mt_destroy+0x220/0x290 do_vmi_align_munmap+0xfb9/0x12e0 do_vmi_munmap+0x1f1/0x2b0 mmap_region+0x1fe/0x26c0 do_mmap+0x833/0xea0 vm_mmap_pgoff+0x1a8/0x3b0 ksys_mmap_pgoff+0x3af/0x500 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 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+0x8c8/0x28b0 __do_softirq+0x1b7/0x7d4 irq_exit_rcu+0x93/0xc0 sysvec_apic_timer_interrupt+0x6e/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 _raw_spin_unlock_irqrestore+0x34/0x50 try_to_wake_up+0x64b/0x1b30 wake_up_q+0x82/0xf0 __mutex_unlock_slowpath+0x20b/0x5e0 register_kprobe+0xc3e/0x1580 __register_trace_kprobe+0x26a/0x2d0 create_local_trace_kprobe+0x1ea/0x3d0 perf_kprobe_init+0x119/0x210 perf_kprobe_event_init+0xfc/0x1d0 perf_try_init_event+0x130/0x570 perf_event_alloc.part.0+0xf84/0x3a30 __do_sys_perf_event_open+0x4d9/0x2a60 do_syscall_64+0x3f/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 _raw_spin_unlock_irqrestore+0x34/0x50 try_to_wake_up+0x64b/0x1b30 wake_up_q+0x82/0xf0 __mutex_unlock_slowpath+0x20b/0x5e0 register_kprobe+0xc3e/0x1580 __register_trace_kprobe+0x26a/0x2d0 create_local_trace_kprobe+0x1ea/0x3d0 perf_kprobe_init+0x119/0x210 perf_kprobe_event_init+0xfc/0x1d0 perf_try_init_event+0x130/0x570 perf_event_alloc.part.0+0xf84/0x3a30 __do_sys_perf_event_open+0x4d9/0x2a60 do_syscall_64+0x3f/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 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+0x8c8/0x28b0 __do_softirq+0x1b7/0x7d4 irq_exit_rcu+0x93/0xc0 sysvec_apic_timer_interrupt+0x6e/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 _raw_spin_unlock_irqrestore+0x34/0x50 try_to_wake_up+0x64b/0x1b30 wake_up_q+0x82/0xf0 __mutex_unlock_slowpath+0x20b/0x5e0 register_kprobe+0xc3e/0x1580 __register_trace_kprobe+0x26a/0x2d0 create_local_trace_kprobe+0x1ea/0x3d0 perf_kprobe_init+0x119/0x210 perf_kprobe_event_init+0xfc/0x1d0 perf_try_init_event+0x130/0x570 perf_event_alloc.part.0+0xf84/0x3a30 __do_sys_perf_event_open+0x4d9/0x2a60 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 stack backtrace: CPU: 0 PID: 6256 Comm: syz-executor.6 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:_raw_spin_unlock_irqrestore+0x34/0x50 Code: c7 18 53 48 89 f3 48 8b 74 24 10 e8 c6 db d8 fc 48 89 ef e8 8e 59 d9 fc 80 e7 02 74 06 e8 44 b5 fe fc fb 65 ff 0d 34 a4 ae 7b <74> 07 5b 5d e9 23 2a 00 00 0f 1f 44 00 00 5b 5d e9 17 2a 00 00 0f RSP: 0018:ffff888013e7f8e8 EFLAGS: 00000202 RAX: 000000000000076b RBX: 0000000000000283 RCX: ffffffff812d1fbf RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8454e68c RBP: ffff888017afa450 R08: 0000000000000001 R09: fffffbfff0ef9b60 R10: ffffffff877cdb07 R11: 0000000000000001 R12: 0000000000000283 R13: ffff888017afa450 R14: ffff888017af9b54 R15: ffff88806ce39500 try_to_wake_up+0x64b/0x1b30 wake_up_q+0x82/0xf0 __mutex_unlock_slowpath+0x20b/0x5e0 register_kprobe+0xc3e/0x1580 __register_trace_kprobe+0x26a/0x2d0 create_local_trace_kprobe+0x1ea/0x3d0 perf_kprobe_init+0x119/0x210 perf_kprobe_event_init+0xfc/0x1d0 perf_try_init_event+0x130/0x570 perf_event_alloc.part.0+0xf84/0x3a30 __do_sys_perf_event_open+0x4d9/0x2a60 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x7f9f6e2bab19 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:00007f9f6b830188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f9f6e3cdf60 RCX: 00007f9f6e2bab19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000280 RBP: 00007f9f6e314f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff29223d6f R14: 00007f9f6b830300 R15: 0000000000022000 sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer ISOFS: Bad logical zone size 12959 loop5: detected capacity change from 0 to 264192 FAT-fs (loop5): invalid media value (0xc7) FAT-fs (loop5): Can't find a valid FAT filesystem ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 18 53 48 sbb %dl,0x48(%rbx) 3: 89 f3 mov %esi,%ebx 5: 48 8b 74 24 10 mov 0x10(%rsp),%rsi a: e8 c6 db d8 fc callq 0xfcd8dbd5 f: 48 89 ef mov %rbp,%rdi 12: e8 8e 59 d9 fc callq 0xfcd959a5 17: 80 e7 02 and $0x2,%bh 1a: 74 06 je 0x22 1c: e8 44 b5 fe fc callq 0xfcfeb565 21: fb sti 22: 65 ff 0d 34 a4 ae 7b decl %gs:0x7baea434(%rip) # 0x7baea45d * 29: 74 07 je 0x32 <-- trapping instruction 2b: 5b pop %rbx 2c: 5d pop %rbp 2d: e9 23 2a 00 00 jmpq 0x2a55 32: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 37: 5b pop %rbx 38: 5d pop %rbp 39: e9 17 2a 00 00 jmpq 0x2a55 3e: 0f .byte 0xf