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Date: Wed, 26 Feb 2020 14:00:37 +0100 From: Guido Trentalancia <guido@...ntalancia.com> To: kuznet@....inr.ac.ru Cc: netdev@...r.kernel.org Subject: net/sched/sch_generic.c stacktrace Here is a stacktrace I get with kernel 5.4.19 after unplugging and replugging the Ethernet interface. Most probably the issue also affects latest git from a couple of days ago (at least the code in net/sched/sch_generic.c). The crash is not critical and the network functionality does not seem to be affected. [ 6663.598726] r8169 0000:02:00.0 eth1: Link is Down [ 6752.433571] r8169 0000:02:00.0 eth1: Link is Up - 10Mbps/Half - flow control off [ 6763.194144] ------------[ cut here ]------------ [ 6763.194149] NETDEV WATCHDOG: eth1 (r8169): transmit queue 0 timed out [ 6763.194177] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:447 dev_watchdog+0x1e3/0x1f0 [ 6763.194178] Modules linked in: nf_conntrack_netlink nfnetlink xt_iprange nf_conntrack_sip xt_CT ipv6 iptable_raw [ 6763.194245] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G T 5.4.19 #14 [ 6763.194254] RIP: 0010:dev_watchdog+0x1e3/0x1f0 [ 6763.194258] Code: 48 63 55 e0 eb 91 4c 89 ef c6 05 20 20 a6 00 01 e8 02 07 fc ff 48 89 c2 44 89 e1 4c 89 ee 48 c7 c7 60 3d dc a3 e8 39 42 a3 ff <0f> 0b eb bc 66 0f 1f 84 00 00 00 00 00 41 54 49 89 d4 55 48 89 f5 [ 6763.194260] RSP: 0018:ffff9ba340130ea8 EFLAGS: 00010286 [ 6763.194264] RAX: 0000000000000000 RBX: ffff8e009f856400 RCX: 0000000000000006 [ 6763.194266] RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff8e00a6a563d0 [ 6763.194268] RBP: ffff8e00a3c7c440 R08: 0000000000000001 R09: 0000000000000366 [ 6763.194269] R10: ffffffffa45309e0 R11: 0000000000000004 R12: 0000000000000000 [ 6763.194271] R13: ffff8e00a3c7c000 R14: ffff9ba340130ef0 R15: ffffffffa4005100 [ 6763.194274] FS: 0000000000000000(0000) GS:ffff8e00a6a40000(0000) knlGS:0000000000000000 [ 6763.194277] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6763.194279] CR2: 00007fb9e2568000 CR3: 000000012000a002 CR4: 00000000003606e0 [ 6763.194281] Call Trace: [ 6763.194284] <IRQ> [ 6763.194292] ? qdisc_put_unlocked+0x30/0x30 [ 6763.194299] call_timer_fn.isra.0+0x19/0x80 [ 6763.194304] run_timer_softirq+0x310/0x360 [ 6763.194311] ? timerqueue_add+0x6d/0xb0 [ 6763.194316] ? __hrtimer_run_queues+0x125/0x180 [ 6763.194323] __do_softirq+0xd7/0x216 [ 6763.194330] irq_exit+0x9b/0xa0 [ 6763.194336] smp_apic_timer_interrupt+0x5e/0x90 [ 6763.194342] apic_timer_interrupt+0xf/0x20 [ 6763.194344] </IRQ> [ 6763.194350] RIP: 0010:cpuidle_enter_state+0x11f/0x2a0 [ 6763.194353] Code: e8 56 3d b0 ff 31 ff 49 89 c6 e8 8c 48 b0 ff 45 84 ff 74 12 9c 58 f6 c4 02 0f 85 65 01 00 00 31 ff e8 b5 05 b5 ff fb 45 85 ed <0f> 88 c0 00 00 00 49 63 f5 48 8d 04 76 48 c1 e0 05 4c 89 f1 8b 7c [ 6763.194356] RSP: 0018:ffff9ba3400cbe88 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 6763.194359] RAX: ffff8e00a6a5fb00 RBX: ffffffffa4052460 RCX: 000000000000001f [ 6763.194361] RDX: 0000000000000000 RSI: 00000000471c745e RDI: 0000000000000000 [ 6763.194363] RBP: 00000626adb99d58 R08: 00000626adc8a08b R09: 000000007fffffff [ 6763.194365] R10: ffff8e00a6a5ec20 R11: ffff8e00a6a5ec00 R12: ffff8e00a6a68e10 [ 6763.194366] R13: 0000000000000004 R14: 00000626adc8a08b R15: 0000000000000000 [ 6763.194373] ? cpuidle_enter_state+0x104/0x2a0 [ 6763.194377] cpuidle_enter+0x24/0x40 [ 6763.194382] do_idle+0x1bf/0x230 [ 6763.194387] cpu_startup_entry+0x14/0x20 [ 6763.194392] start_secondary+0x153/0x1a0 [ 6763.194397] secondary_startup_64+0xa4/0xb0 [ 6763.194400] ---[ end trace 56803b552c779a28 ]---
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