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Wed, 8 Jan 2025 02:28:57 +0000 Date: Wed, 8 Jan 2025 10:28:46 +0800 From: kernel test robot To: Kuniyuki Iwashima CC: , , , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "Simon Horman" , Kuniyuki Iwashima , "Kuniyuki Iwashima" , Subject: Re: [PATCH v1 net-next 1/4] net: Convert netdev_chain to blocking_notifier. 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[ 5.614973][ T1] [ 5.614973][ T1] but task is already holding lock: [ 5.615681][ T1] 8bb1f2c0 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:?) [ 5.616710][ T1] [ 5.616710][ T1] other info that might help us debug this: [ 5.617477][ T1] Possible unsafe locking scenario: [ 5.617477][ T1] [ 5.618212][ T1] CPU0 [ 5.618531][ T1] ---- [ 5.618867][ T1] lock((netdev_chain).rwsem); [ 5.619378][ T1] lock((netdev_chain).rwsem); [ 5.619874][ T1] [ 5.619874][ T1] *** DEADLOCK *** [ 5.619874][ T1] [ 5.620686][ T1] May be due to missing lock nesting notation [ 5.620686][ T1] [ 5.621503][ T1] 2 locks held by swapper/1: [ 5.621956][ T1] #0: 8bb1fd24 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock (net/core/rtnetlink.c:80) [ 5.622737][ T1] #1: 8bb1f2c0 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:?) [ 5.623745][ T1] [ 5.623745][ T1] stack backtrace: [ 5.624307][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper Tainted: G T 6.13.0-rc5-00768-ga105e36eac9f #1 [ 5.625360][ T1] Tainted: [T]=RANDSTRUCT [ 5.625789][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 5.626829][ T1] Call Trace: [ 5.627162][ T1] dump_stack_lvl (lib/dump_stack.c:122) [ 5.627595][ T1] ? vprintk (kernel/printk/printk_safe.c:?) [ 5.628004][ T1] dump_stack (lib/dump_stack.c:129) [ 5.628427][ T1] print_deadlock_bug (kernel/locking/lockdep.c:3039) [ 5.628931][ T1] __lock_acquire (kernel/locking/lockdep.c:3089 kernel/locking/lockdep.c:3891 kernel/locking/lockdep.c:5226) [ 5.629437][ T1] lock_acquire (kernel/locking/lockdep.c:5849) [ 5.629883][ T1] ? blocking_notifier_call_chain (kernel/notifier.c:?) [ 5.630484][ T1] down_read (kernel/locking/rwsem.c:1524) [ 5.630907][ T1] ? blocking_notifier_call_chain (kernel/notifier.c:?) [ 5.631522][ T1] ? notifier_call_chain (kernel/notifier.c:?) [ 5.632054][ T1] blocking_notifier_call_chain (kernel/notifier.c:?) [ 5.632631][ T1] call_netdevice_notifiers_info (net/core/dev.c:1997) [ 5.633224][ T1] register_netdevice (include/linux/notifier.h:207 net/core/dev.c:10597) [ 5.633717][ T1] bpq_device_event (drivers/net/hamradio/bpqether.c:500 drivers/net/hamradio/bpqether.c:542) [ 5.634190][ T1] notifier_call_chain (kernel/notifier.c:?) [ 5.634710][ T1] blocking_notifier_call_chain (kernel/notifier.c:380) [ 5.635284][ T1] call_netdevice_notifiers_info (net/core/dev.c:1997) [ 5.635875][ T1] __dev_notify_flags (net/core/dev.c:8995) [ 5.636372][ T1] dev_change_flags (net/core/dev.c:?) [ 5.636833][ T1] ic_open_devs (net/ipv4/ipconfig.c:242) [ 5.637265][ T1] ? wait_for_devices (net/ipv4/ipconfig.c:?) [ 5.637736][ T1] ip_auto_config (net/ipv4/ipconfig.c:1515) [ 5.638192][ T1] do_one_initcall (init/main.c:1266) [ 5.638656][ T1] ? root_nfs_parse_addr (net/ipv4/ipconfig.c:1477) [ 5.639169][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4670 kernel/locking/lockdep.c:5180) [ 5.639684][ T1] ? ktime_get (include/linux/seqlock.h:368 (discriminator 3) include/linux/seqlock.h:388 (discriminator 3) kernel/time/timekeeping.c:815 (discriminator 3)) [ 5.640142][ T1] ? irqentry_exit (kernel/entry/common.c:?) [ 5.640619][ T1] ? check_preemption_disabled (lib/smp_processor_id.c:16 (discriminator 1)) [ 5.641205][ T1] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67) [ 5.641755][ T1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4468 (discriminator 5)) [ 5.642293][ T1] ? trace_hardirqs_on (kernel/trace/trace_preemptirq.c:80) [ 5.642800][ T1] ? irqentry_exit (kernel/entry/common.c:?) [ 5.643271][ T1] ? vmware_sched_clock (arch/x86/kernel/apic/apic.c:1049) [ 5.643776][ T1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 (discriminator 6)) [ 5.644336][ T1] ? handle_exception (init_task.c:?) [ 5.644843][ T1] ? next_arg (lib/cmdline.c:273) [ 5.645293][ T1] do_initcall_level (init/main.c:1327 (discriminator 6)) [ 5.645781][ T1] do_initcalls (init/main.c:1341 (discriminator 2)) [ 5.646223][ T1] do_basic_setup (init/main.c:1364) [ 5.646697][ T1] kernel_init_freeable (init/main.c:1579) [ 5.647216][ T1] ? rest_init (init/main.c:1458) [ 5.647671][ T1] ? rest_init (init/main.c:1458) [ 5.648135][ T1] kernel_init (init/main.c:1468) [ 5.648604][ T1] ret_from_fork (arch/x86/kernel/process.c:153) [ 5.649060][ T1] ret_from_fork_asm (??:?) [ 5.649533][ T1] entry_INT80_32 (init_task.c:?) [ 7.669903][ T35] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX [ 7.682723][ T1] Sending DHCP requests ., OK The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250108/202501081030.464a8d0a-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki