Hi Ahmed! Erhard is reporting a lockdep splat in drivers/net/ethernet/realtek/8139too.c
https://bugzilla.kernel.org/show_bug.cgi?id=211575 I can't quite grasp how that happens it looks like it's the Rx lock/syncp on one side and the Tx lock on the other side :S ================================ WARNING: inconsistent lock state 5.12.0-rc1-Pentium4 #2 Not tainted -------------------------------- inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: c113c804 (&syncp->seq#2){?.-.}-{0:0}, at: rtl8139_poll+0x251/0x350 {IN-HARDIRQ-W} state was registered at: lock_acquire+0x239/0x2c5 do_write_seqcount_begin_nested.constprop.0+0x1a/0x1f rtl8139_interrupt+0x346/0x3cb __handle_irq_event_percpu+0xe5/0x20c handle_irq_event_percpu+0x17/0x3d handle_irq_event+0x29/0x42 handle_fasteoi_irq+0x67/0xd7 __handle_irq+0x7d/0x9c __common_interrupt+0x68/0xc3 common_interrupt+0x22/0x35 asm_common_interrupt+0x106/0x180 _raw_spin_unlock_irqrestore+0x41/0x45 __mod_timer+0x1cd/0x1d8 mod_timer+0xa/0xc mld_ifc_start_timer+0x24/0x37 mld_ifc_timer_expire+0x1b0/0x1c0 call_timer_fn+0xfe/0x201 __run_timers+0x134/0x159 run_timer_softirq+0x14/0x27 __do_softirq+0x15f/0x307 call_on_stack+0x40/0x46 do_softirq_own_stack+0x1c/0x1e __irq_exit_rcu+0x4f/0x85 irq_exit_rcu+0x8/0x11 sysvec_apic_timer_interrupt+0x20/0x2e handle_exception_return+0x0/0xaf default_idle+0xa/0xc arch_cpu_idle+0xd/0xf default_idle_call+0x48/0x74 do_idle+0xb7/0x1c3 cpu_startup_entry+0x19/0x1b rest_init+0x11d/0x120 arch_call_rest_init+0x8/0xb start_kernel+0x417/0x425 i386_start_kernel+0x43/0x45 startup_32_smp+0x164/0x168 irq event stamp: 26328 hardirqs last enabled at (26328): [<c4362e64>] __slab_alloc.constprop.0+0x3e/0x59 hardirqs last disabled at (26327): [<c4362e47>] __slab_alloc.constprop.0+0x21/0x59 softirqs last enabled at (26314): [<c4789f1f>] __do_softirq+0x2d7/0x307 softirqs last disabled at (26321): [<c420fecb>] call_on_stack+0x40/0x46 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&syncp->seq#2); <Interrupt> lock(&syncp->seq#2); *** DEADLOCK *** 1 lock held by swapper/0/0: #0: c113c8a4 (&tp->rx_lock){+.-.}-{2:2}, at: rtl8139_poll+0x31/0x350 stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc1-Pentium4 #2 Hardware name: /FS51, BIOS 6.00 PG 12/02/2003 Call Trace: <SOFTIRQ> dump_stack+0x78/0xa5 print_usage_bug+0x17d/0x188 mark_lock.part.0+0xfd/0x27a ? hlock_class+0x18/0x58 ? mark_lock.part.0+0x33/0x27a ? ___slab_alloc.constprop.0+0x2b7/0x2d1 __lock_acquire+0x458/0x1488 ? rcu_read_lock_sched_held+0x23/0x4a ? trace_kmalloc+0x8c/0xb9 ? __kmalloc_track_caller+0x130/0x143 lock_acquire+0x239/0x2c5 ? rtl8139_poll+0x251/0x350 ? __alloc_skb+0xb7/0x102 do_write_seqcount_begin_nested.constprop.0+0x1a/0x1f ? rtl8139_poll+0x251/0x350 rtl8139_poll+0x251/0x350 __napi_poll+0x24/0xf1 net_rx_action+0xbb/0x177 __do_softirq+0x15f/0x307 ? __entry_text_end+0x5/0x5 call_on_stack+0x40/0x46 </SOFTIRQ> ? __irq_exit_rcu+0x4f/0x85 ? irq_exit_rcu+0x8/0x11 ? common_interrupt+0x27/0x35 ? asm_common_interrupt+0x106/0x180 ? ldsem_down_write+0x1f/0x1f ? newidle_balance+0x1d0/0x3ab ? default_idle+0xa/0xc ? __pci_setup_bridge+0x4e/0x64 ? default_idle+0xa/0xc ? arch_cpu_idle+0xd/0xf ? default_idle_call+0x48/0x74 ? do_idle+0xb7/0x1c3 ? cpu_startup_entry+0x19/0x1b ? rest_init+0x11d/0x120 ? arch_call_rest_init+0x8/0xb ? start_kernel+0x417/0x425 ? i386_start_kernel+0x43/0x45 ? startup_32_smp+0x164/0x168
