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Message-ID: <85dd4590-ea6b-427d-876a-1d8559c7ad82@roeck-us.net>
Date: Wed, 27 Nov 2024 09:43:54 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Joe Damato <jdamato@...tly.com>
Cc: netdev@...r.kernel.org, mkarsten@...terloo.ca, skhawaja@...gle.com,
sdf@...ichev.me, bjorn@...osinc.com, amritha.nambiar@...el.com,
sridhar.samudrala@...el.com, willemdebruijn.kernel@...il.com,
edumazet@...gle.com, Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Paolo Abeni <pabeni@...hat.com>, Jonathan Corbet <corbet@....net>,
Jiri Pirko <jiri@...nulli.us>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Lorenzo Bianconi <lorenzo@...nel.org>,
Johannes Berg <johannes.berg@...el.com>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [net-next v6 5/9] net: napi: Add napi_config
Hi,
On Fri, Oct 11, 2024 at 06:45:00PM +0000, Joe Damato wrote:
> Add a persistent NAPI config area for NAPI configuration to the core.
> Drivers opt-in to setting the persistent config for a NAPI by passing an
> index when calling netif_napi_add_config.
>
> napi_config is allocated in alloc_netdev_mqs, freed in free_netdev
> (after the NAPIs are deleted).
>
> Drivers which call netif_napi_add_config will have persistent per-NAPI
> settings: NAPI IDs, gro_flush_timeout, and defer_hard_irq settings.
>
> Per-NAPI settings are saved in napi_disable and restored in napi_enable.
>
> Co-developed-by: Martin Karsten <mkarsten@...terloo.ca>
> Signed-off-by: Martin Karsten <mkarsten@...terloo.ca>
> Signed-off-by: Joe Damato <jdamato@...tly.com>
> Reviewed-by: Jakub Kicinski <kuba@...nel.org>
This patch triggers a lock inversion message on pcnet Ethernet adapters.
========================================================
WARNING: possible irq lock inversion dependency detected
6.12.0-08446-g228a1157fb9f #1 Tainted: G N
The problem seems obvious - napi_hash_lock and the local driver lock are
acquired in different order depending on the call sequence. Unfortunately
I have no idea how to fix the problem or I'd submit a patch.
Complete backtrace and bisect log attached. Bisect was run with qemu on
riscv64, but the architecture/platform does not really matter.
Please let me know if there is anything I can do to help resolve the
problem.
Thanks,
Guenter
---
[ 13.251894] ========================================================
[ 13.252024] WARNING: possible irq lock inversion dependency detected
[ 13.252307] 6.12.0-08446-g228a1157fb9f #1 Tainted: G N
[ 13.252472] --------------------------------------------------------
[ 13.252569] ip/1816 just changed the state of lock:
[ 13.252678] ffffffff81dec490 (napi_hash_lock){+...}-{3:3}, at: napi_disable+0xf8/0x10c
[ 13.253497] but this lock was taken by another, HARDIRQ-safe lock in the past:
[ 13.253637] (&lp->lock){-.-.}-{3:3}
[ 13.253682]
[ 13.253682]
[ 13.253682] and interrupts could create inverse lock ordering between them.
[ 13.253682]
[ 13.253923]
[ 13.253923] other info that might help us debug this:
[ 13.254082] Possible interrupt unsafe locking scenario:
[ 13.254082]
[ 13.254186] CPU0 CPU1
[ 13.254264] ---- ----
[ 13.254340] lock(napi_hash_lock);
[ 13.254438] local_irq_disable();
[ 13.254532] lock(&lp->lock);
[ 13.254649] lock(napi_hash_lock);
[ 13.254772] <Interrupt>
[ 13.254828] lock(&lp->lock);
[ 13.254921]
[ 13.254921] *** DEADLOCK ***
[ 13.254921]
[ 13.255049] 1 lock held by ip/1816:
[ 13.255127] #0: ffffffff81dece50 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x22a/0x74c
[ 13.255398]
[ 13.255398] the shortest dependencies between 2nd lock and 1st lock:
[ 13.255593] -> (&lp->lock){-.-.}-{3:3} ops: 75 {
[ 13.255802] IN-HARDIRQ-W at:
[ 13.255910] __lock_acquire+0xa3e/0x2158
[ 13.256055] lock_acquire.part.0+0xba/0x21e
[ 13.256153] lock_acquire+0x44/0x5a
[ 13.256241] _raw_spin_lock+0x2c/0x40
[ 13.256343] pcnet32_interrupt+0x3c/0x200
[ 13.256442] __handle_irq_event_percpu+0xa0/0x2e0
[ 13.256547] handle_irq_event+0x3c/0x8a
[ 13.256640] handle_fasteoi_irq+0x9c/0x1d2
[ 13.256738] generic_handle_domain_irq+0x1c/0x2a
[ 13.256840] plic_handle_irq+0x7e/0xfc
[ 13.256937] generic_handle_domain_irq+0x1c/0x2a
[ 13.257041] riscv_intc_irq+0x26/0x60
[ 13.257133] handle_riscv_irq+0x4a/0x74
[ 13.257228] call_on_irq_stack+0x32/0x40
[ 13.257349] IN-SOFTIRQ-W at:
[ 13.257420] __lock_acquire+0x40a/0x2158
[ 13.257515] lock_acquire.part.0+0xba/0x21e
[ 13.257611] lock_acquire+0x44/0x5a
[ 13.257699] _raw_spin_lock_irqsave+0x3a/0x64
[ 13.257798] pcnet32_poll+0x2ac/0x768
[ 13.257892] __napi_poll.constprop.0+0x26/0x128
[ 13.257997] net_rx_action+0x186/0x30e
[ 13.258090] handle_softirqs+0x110/0x4a2
[ 13.258187] __irq_exit_rcu+0xe2/0x10c
[ 13.258279] irq_exit_rcu+0xc/0x36
[ 13.258368] handle_riscv_irq+0x64/0x74
[ 13.258463] call_on_irq_stack+0x32/0x40
[ 13.258558] INITIAL USE at:
[ 13.258629] __lock_acquire+0x46c/0x2158
[ 13.258723] lock_acquire.part.0+0xba/0x21e
[ 13.258820] lock_acquire+0x44/0x5a
[ 13.258909] _raw_spin_lock_irqsave+0x3a/0x64
[ 13.259007] pcnet32_get_stats+0x2a/0x62
[ 13.259101] dev_get_stats+0xc4/0x2a6
[ 13.259380] rtnl_fill_stats+0x32/0xee
[ 13.259480] rtnl_fill_ifinfo.isra.0+0x648/0x141c
[ 13.259589] rtmsg_ifinfo_build_skb+0x98/0xf0
[ 13.259711] rtmsg_ifinfo+0x36/0x78
[ 13.259799] register_netdevice+0x758/0x7a8
[ 13.259905] register_netdev+0x18/0x2e
[ 13.259999] pcnet32_probe1+0xb96/0x103e
[ 13.260099] pcnet32_probe_pci+0xcc/0x12e
[ 13.260196] pci_device_probe+0x82/0x100
[ 13.260291] really_probe+0x86/0x234
[ 13.260383] __driver_probe_device+0x5c/0xda
[ 13.260482] driver_probe_device+0x2c/0xb2
[ 13.260578] __driver_attach+0x70/0x120
[ 13.260671] bus_for_each_dev+0x60/0xae
[ 13.260764] driver_attach+0x1a/0x22
[ 13.260853] bus_add_driver+0xce/0x1d6
[ 13.260951] driver_register+0x3e/0xd8
[ 13.261048] __pci_register_driver+0x5c/0x66
[ 13.261149] pcnet32_init_module+0x58/0x14a
[ 13.261255] do_one_initcall+0x7e/0x2b6
[ 13.261352] kernel_init_freeable+0x2cc/0x33e
[ 13.261456] kernel_init+0x1e/0x11a
[ 13.261550] ret_from_fork+0xe/0x18
[ 13.261653] }
[ 13.261705] ... key at: [<ffffffff82a9efb0>] __key.4+0x0/0x10
[ 13.261839] ... acquired at:
[ 13.261907] lock_acquire.part.0+0xba/0x21e
[ 13.261987] lock_acquire+0x44/0x5a
[ 13.262056] _raw_spin_lock+0x2c/0x40
[ 13.262132] napi_hash_add+0x26/0xb8
[ 13.262207] napi_enable+0x10e/0x124
[ 13.262281] pcnet32_open+0x3c2/0x6b8
[ 13.262357] __dev_open+0xba/0x158
[ 13.262427] __dev_change_flags+0x19a/0x214
[ 13.262508] dev_change_flags+0x1e/0x56
[ 13.262583] do_setlink.isra.0+0x20c/0xcc2
[ 13.262661] rtnl_newlink+0x592/0x74c
[ 13.262731] rtnetlink_rcv_msg+0x3a8/0x582
[ 13.262807] netlink_rcv_skb+0x44/0xf4
[ 13.262882] rtnetlink_rcv+0x14/0x1c
[ 13.262956] netlink_unicast+0x1a0/0x23e
[ 13.263031] netlink_sendmsg+0x17e/0x38e
[ 13.263109] __sock_sendmsg+0x40/0x7a
[ 13.263182] ____sys_sendmsg+0x18e/0x1de
[ 13.263288] ___sys_sendmsg+0x82/0xc6
[ 13.263360] __sys_sendmsg+0x8e/0xe0
[ 13.263430] __riscv_sys_sendmsg+0x16/0x1e
[ 13.263507] do_trap_ecall_u+0x1b6/0x1e2
[ 13.263583] _new_vmalloc_restore_context_a0+0xc2/0xce
[ 13.263685]
[ 13.263746] -> (napi_hash_lock){+...}-{3:3} ops: 2 {
[ 13.263891] HARDIRQ-ON-W at:
[ 13.263963] __lock_acquire+0x688/0x2158
[ 13.264057] lock_acquire.part.0+0xba/0x21e
[ 13.264153] lock_acquire+0x44/0x5a
[ 13.264240] _raw_spin_lock+0x2c/0x40
[ 13.264330] napi_disable+0xf8/0x10c
[ 13.264419] pcnet32_close+0x5c/0x126
[ 13.264511] __dev_close_many+0x8a/0xf8
[ 13.264609] __dev_change_flags+0x176/0x214
[ 13.264708] dev_change_flags+0x1e/0x56
[ 13.264800] do_setlink.isra.0+0x20c/0xcc2
[ 13.264900] rtnl_newlink+0x592/0x74c
[ 13.264988] rtnetlink_rcv_msg+0x3a8/0x582
[ 13.265082] netlink_rcv_skb+0x44/0xf4
[ 13.265174] rtnetlink_rcv+0x14/0x1c
[ 13.265268] netlink_unicast+0x1a0/0x23e
[ 13.265367] netlink_sendmsg+0x17e/0x38e
[ 13.265466] __sock_sendmsg+0x40/0x7a
[ 13.265557] ____sys_sendmsg+0x18e/0x1de
[ 13.265649] ___sys_sendmsg+0x82/0xc6
[ 13.265738] __sys_sendmsg+0x8e/0xe0
[ 13.265828] __riscv_sys_sendmsg+0x16/0x1e
[ 13.265928] do_trap_ecall_u+0x1b6/0x1e2
[ 13.266024] _new_vmalloc_restore_context_a0+0xc2/0xce
[ 13.266134] INITIAL USE at:
[ 13.266206] __lock_acquire+0x46c/0x2158
[ 13.266298] lock_acquire.part.0+0xba/0x21e
[ 13.266394] lock_acquire+0x44/0x5a
[ 13.266480] _raw_spin_lock+0x2c/0x40
[ 13.266572] napi_hash_add+0x26/0xb8
[ 13.266660] napi_enable+0x10e/0x124
[ 13.266748] pcnet32_open+0x3c2/0x6b8
[ 13.266839] __dev_open+0xba/0x158
[ 13.266930] __dev_change_flags+0x19a/0x214
[ 13.267026] dev_change_flags+0x1e/0x56
[ 13.267116] do_setlink.isra.0+0x20c/0xcc2
[ 13.267211] rtnl_newlink+0x592/0x74c
[ 13.267299] rtnetlink_rcv_msg+0x3a8/0x582
[ 13.267395] netlink_rcv_skb+0x44/0xf4
[ 13.267489] rtnetlink_rcv+0x14/0x1c
[ 13.267578] netlink_unicast+0x1a0/0x23e
[ 13.267670] netlink_sendmsg+0x17e/0x38e
[ 13.267763] __sock_sendmsg+0x40/0x7a
[ 13.267851] ____sys_sendmsg+0x18e/0x1de
[ 13.267946] ___sys_sendmsg+0x82/0xc6
[ 13.268034] __sys_sendmsg+0x8e/0xe0
[ 13.268121] __riscv_sys_sendmsg+0x16/0x1e
[ 13.268215] do_trap_ecall_u+0x1b6/0x1e2
[ 13.268309] _new_vmalloc_restore_context_a0+0xc2/0xce
[ 13.268419] }
[ 13.268460] ... key at: [<ffffffff81dec490>] napi_hash_lock+0x18/0x40
[ 13.268579] ... acquired at:
[ 13.268636] mark_lock+0x5f2/0x88a
[ 13.268705] __lock_acquire+0x688/0x2158
[ 13.268779] lock_acquire.part.0+0xba/0x21e
[ 13.268858] lock_acquire+0x44/0x5a
[ 13.268930] _raw_spin_lock+0x2c/0x40
[ 13.269002] napi_disable+0xf8/0x10c
[ 13.269073] pcnet32_close+0x5c/0x126
[ 13.269145] __dev_close_many+0x8a/0xf8
[ 13.269220] __dev_change_flags+0x176/0x214
[ 13.269298] dev_change_flags+0x1e/0x56
[ 13.269371] do_setlink.isra.0+0x20c/0xcc2
[ 13.269449] rtnl_newlink+0x592/0x74c
[ 13.269520] rtnetlink_rcv_msg+0x3a8/0x582
[ 13.269596] netlink_rcv_skb+0x44/0xf4
[ 13.269671] rtnetlink_rcv+0x14/0x1c
[ 13.269742] netlink_unicast+0x1a0/0x23e
[ 13.269818] netlink_sendmsg+0x17e/0x38e
[ 13.269894] __sock_sendmsg+0x40/0x7a
[ 13.269966] ____sys_sendmsg+0x18e/0x1de
[ 13.270041] ___sys_sendmsg+0x82/0xc6
[ 13.270114] __sys_sendmsg+0x8e/0xe0
[ 13.270187] __riscv_sys_sendmsg+0x16/0x1e
[ 13.270268] do_trap_ecall_u+0x1b6/0x1e2
[ 13.270346] _new_vmalloc_restore_context_a0+0xc2/0xce
[ 13.270439]
[ 13.270525]
[ 13.270525] stack backtrace:
[ 13.270729] CPU: 0 UID: 0 PID: 1816 Comm: ip Tainted: G N 6.12.0-08446-g228a1157fb9f #1
[ 13.270933] Tainted: [N]=TEST
[ 13.271006] Hardware name: riscv-virtio,qemu (DT)
[ 13.271165] Call Trace:
[ 13.271270] [<ffffffff80006d42>] dump_backtrace+0x1c/0x24
[ 13.271373] [<ffffffff80dc5574>] show_stack+0x2c/0x38
[ 13.271467] [<ffffffff80ddc854>] dump_stack_lvl+0x74/0xac
[ 13.271565] [<ffffffff80ddc8a0>] dump_stack+0x14/0x1c
[ 13.271657] [<ffffffff8008551a>] print_irq_inversion_bug.part.0+0x1aa/0x1fe
[ 13.271775] [<ffffffff800867f8>] mark_lock+0x5f2/0x88a
[ 13.271869] [<ffffffff80087d44>] __lock_acquire+0x688/0x2158
[ 13.271973] [<ffffffff80086e10>] lock_acquire.part.0+0xba/0x21e
[ 13.272078] [<ffffffff80086fb8>] lock_acquire+0x44/0x5a
[ 13.272173] [<ffffffff80de8ea4>] _raw_spin_lock+0x2c/0x40
[ 13.272269] [<ffffffff80b89bf0>] napi_disable+0xf8/0x10c
[ 13.272360] [<ffffffff8099d022>] pcnet32_close+0x5c/0x126
[ 13.272454] [<ffffffff80b8fa52>] __dev_close_many+0x8a/0xf8
[ 13.272549] [<ffffffff80b9790e>] __dev_change_flags+0x176/0x214
[ 13.272647] [<ffffffff80b979ca>] dev_change_flags+0x1e/0x56
[ 13.272740] [<ffffffff80ba93a8>] do_setlink.isra.0+0x20c/0xcc2
[ 13.272838] [<ffffffff80baa3f0>] rtnl_newlink+0x592/0x74c
[ 13.272935] [<ffffffff80babf5a>] rtnetlink_rcv_msg+0x3a8/0x582
[ 13.273032] [<ffffffff80c05bcc>] netlink_rcv_skb+0x44/0xf4
[ 13.273127] [<ffffffff80ba64f6>] rtnetlink_rcv+0x14/0x1c
[ 13.273223] [<ffffffff80c05578>] netlink_unicast+0x1a0/0x23e
[ 13.273326] [<ffffffff80c05794>] netlink_sendmsg+0x17e/0x38e
[ 13.273423] [<ffffffff80b633e2>] __sock_sendmsg+0x40/0x7a
[ 13.273515] [<ffffffff80b63742>] ____sys_sendmsg+0x18e/0x1de
[ 13.273610] [<ffffffff80b65e44>] ___sys_sendmsg+0x82/0xc6
[ 13.273704] [<ffffffff80b662ac>] __sys_sendmsg+0x8e/0xe0
[ 13.273795] [<ffffffff80b66314>] __riscv_sys_sendmsg+0x16/0x1e
[ 13.273894] [<ffffffff80ddd3e4>] do_trap_ecall_u+0x1b6/0x1e2
[ 13.273992] [<ffffffff80de9c7a>] _new_vmalloc_restore_context_a0+0xc2/0xce
---
# bad: [228a1157fb9fec47eb135b51c0202b574e079ebf] Merge tag '6.13-rc-part1-SMB3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
# good: [43fb83c17ba2d63dfb798f0be7453ed55ca3f9c2] Merge tag 'soc-arm-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect start '228a1157fb9f' '43fb83c17ba2'
# bad: [071b34dcf71523a559b6c39f5d21a268a9531b50] Merge tag 'sound-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect bad 071b34dcf71523a559b6c39f5d21a268a9531b50
# bad: [31a1f8752f7df7e3d8122054fbef02a9a8bff38f] Merge branch 'phy-mediatek-reorg'
git bisect bad 31a1f8752f7df7e3d8122054fbef02a9a8bff38f
# bad: [de51ad08b1177bbbb8b60cb7dd4c3c5dd50d262f] phonet: Pass net and ifindex to rtm_phonet_notify().
git bisect bad de51ad08b1177bbbb8b60cb7dd4c3c5dd50d262f
# good: [76d46d766a45e205e59af511efbb24abe22d0b4c] net: emaclite: Adopt clock support
git bisect good 76d46d766a45e205e59af511efbb24abe22d0b4c
# bad: [a37b0e4eca0436ebc17d512d70b1409956340688] ipv6: Use rtnl_register_many().
git bisect bad a37b0e4eca0436ebc17d512d70b1409956340688
# bad: [de306f0051ae947680a13c13a9fd9373d7460bb1] net: gianfar: Use __be64 * to store pointers to big endian values
git bisect bad de306f0051ae947680a13c13a9fd9373d7460bb1
# good: [5c16e118b796e95d6e5c80c5d8af2591262431c9] net: ethernet: ti: am65-cpsw: Use __be64 type for id_temp
git bisect good 5c16e118b796e95d6e5c80c5d8af2591262431c9
# bad: [41936522749654e64531121bbd6a95bab5d56d76] bnxt: Add support for persistent NAPI config
git bisect bad 41936522749654e64531121bbd6a95bab5d56d76
# good: [79636038d37e7bd4d078238f2a3f002cab4423bc] ipv4: tcp: give socket pointer to control skbs
git bisect good 79636038d37e7bd4d078238f2a3f002cab4423bc
# good: [516010460011ae74ac3b7383cf90ed27e2711cd6] netdev-genl: Dump napi_defer_hard_irqs
git bisect good 516010460011ae74ac3b7383cf90ed27e2711cd6
# good: [0137891e74576f77a7901718dc0ce08ca074ae74] netdev-genl: Dump gro_flush_timeout
git bisect good 0137891e74576f77a7901718dc0ce08ca074ae74
# bad: [1287c1ae0fc227e5acef11a539eb4e75646e31c7] netdev-genl: Support setting per-NAPI config values
git bisect bad 1287c1ae0fc227e5acef11a539eb4e75646e31c7
# bad: [86e25f40aa1e9e54e081e55016f65b5c92523989] net: napi: Add napi_config
git bisect bad 86e25f40aa1e9e54e081e55016f65b5c92523989
# first bad commit: [86e25f40aa1e9e54e081e55016f65b5c92523989] net: napi: Add napi_config
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