From: Ban ZuoXiang <bbaa@bbaa.fun>
To: aliceryhl@google.com, gregkh@linuxfoundation.org
Cc: ojeda@kernel.org, alex.gaynor@gmail.com, linux-mm@kvack.org,
rust-for-linux@vger.kernel.org, stable@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [BUG] soft lockup in kswapd0 caused by Rust binder
Date: Mon, 29 Dec 2025 02:31:24 +0800 [thread overview]
Message-ID: <20251228183129.17193-1-bbaa@bbaa.fun> (raw)
Hello,
Many users [1][2][3] have reported a kernel soft lockup in the
kswapd0 task when running Waydroid (an Android container solution) on
kernels with the new Rust Binder driver.
The issue manifests as a soft lockup where CPU utilization is pegged at
100% system time, stuck in the list_lru_walk path triggered by the Rust
binder's shrinker.
Kernel Log:
12 25 01:23:57 arch-laptop kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kswapd0:142]
12 25 01:23:57 arch-laptop kernel: CPU#0 Utilization every 4000ms during lockup:
12 25 01:23:57 arch-laptop kernel: #1: 100% system, 0% softirq, 1% hardirq, 0% idle
12 25 01:23:57 arch-laptop kernel: #2: 100% system, 0% softirq, 1% hardirq, 0% idle
12 25 01:23:57 arch-laptop kernel: #3: 100% system, 0% softirq, 1% hardirq, 0% idle
12 25 01:23:57 arch-laptop kernel: #4: 100% system, 0% softirq, 1% hardirq, 0% idle
12 25 01:23:57 arch-laptop kernel: #5: 100% system, 0% softirq, 1% hardirq, 0% idle
12 25 01:23:57 arch-laptop kernel: Modules linked in: sch_ingress af_key tcp_diag udp_diag inet_diag nfnetlink_log xfrm_user xfrm_algo xfrm_interface xfrm6_tunnel tunnel4 tunnel6 vsock_loopback vmw_vsock_virtio_transport_common vmw_vsock_vmci_transport vsock vmw_vmci veth overlay loop nft_masq nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bridge stp llc nf_tables tun rfcomm snd_seq_dummy snd_hrtimer snd_seq cmac algif_hash algif_skcipher af_alg bnep vfat fat iwlmvm intel_rapl_msr amd_atl amdgpu intel_rapl_common mac80211 ptp pps_core libarc4 amdxcp snd_hda_codec_nvhdmi drm_panel_backlight_quirks snd_hda_codec_hdmi gpu_sched snd_usb_audio drm_buddy iwlwifi kvm_amd drm_exec uvcvideo drm_suballoc_helper snd_hda_intel drm_ttm_helper btusb kvm videobuf2_vmalloc spd5118 r8169 snd_hda_codec snd_usbmidi_lib ttm ucsi_acpi btmtk uvc snd_hda_core cfg80211 realtek btrtl irqbypass i2c_algo_bit snd_ump videobuf2_memops asus_nb_wmi typec_ucsi snd_intel_dspcfg sp5100_tco mdio_devres polyval_clmulni videobuf2_v4l2 btbcm amd_pmf
12 25 01:23:57 arch-laptop kernel: ghash_clmulni_intel snd_rawmidi drm_display_helper snd_intel_sdw_acpi asus_wmi libphy typec videobuf2_common i2c_piix4 btintel aesni_intel snd_hwdep snd_seq_device amdtee hid_multitouch bluetooth videodev cec wmi_bmof sparse_keymap rapl pcspkr roles ccp k10temp rfkill video i2c_smbus mdio_bus amd_sfh snd_pcm thunderbolt i2c_hid_acpi platform_profile snd_timer wmi i2c_hid tee snd amd_pmc soundcore mc mousedev joydev mac_hid tcp_bbr sch_fq_pie sch_pie i2c_dev pkcs8_key_parser ntsync crypto_user nfnetlink hid_logitech_hidpp hid_logitech_dj nvme nvme_core nvme_keyring nvme_auth hkdf serio_raw
12 25 01:23:57 arch-laptop kernel: CPU: 0 UID: 0 PID: 142 Comm: kswapd0 Not tainted 6.18.2-zen2-1-zen #1 PREEMPT(full) 817688afc19ca15a22737742591535351aba70f8
12 25 01:23:57 arch-laptop kernel: Hardware name: ASUSTeK COMPUTER INC. ASUS TUF Gaming A15 FA507RM_FA507RM/FA507RM, BIOS FA507RM.315 11/30/2022
12 25 01:23:57 arch-laptop kernel: RIP: 0010:native_queued_spin_lock_slowpath+0x67/0x2e0
12 25 01:23:57 arch-laptop kernel: Code: 0f 92 c2 8b 01 0f b6 d2 c1 e2 08 30 e4 09 d0 3d ff 00 00 00 0f 87 1e 02 00 00 85 c0 74 10 0f b6 01 84 c0 74 09 f3 90 0f b6 01 <84> c0 75 f7 b8 01 00 00 00 66 89 01 65 48 ff 05 ad af ed 01 c3 cc
12 25 01:23:57 arch-laptop kernel: RSP: 0018:ffffd4c4c06e3a30 EFLAGS: 00000202
12 25 01:23:57 arch-laptop kernel: RAX: 0000000000000001 RBX: ffffd4c4c06e3b10 RCX: ffff8d69446aa698
12 25 01:23:57 arch-laptop kernel: RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8d69446aa698
12 25 01:23:57 arch-laptop kernel: RBP: ffffffff94118f38 R08: 0000000000000000 R09: 0000000000000000
12 25 01:23:57 arch-laptop kernel: R10: ffff8d6fa1e38340 R11: ffff8d6fbe2d6000 R12: ffff8d6c5aaf8000
12 25 01:23:57 arch-laptop kernel: R13: ffffffff91d15410 R14: ffff8d69446aa680 R15: ffff8d69446aa680
12 25 01:23:57 arch-laptop kernel: FS: 0000000000000000(0000) GS:ffff8d700deaf000(0000) knlGS:0000000000000000
12 25 01:23:57 arch-laptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
12 25 01:23:57 arch-laptop kernel: CR2: 00000000100af568 CR3: 000000020da24000 CR4: 0000000000f50ef0
12 25 01:23:57 arch-laptop kernel: PKRU: 55555554
12 25 01:23:57 arch-laptop kernel: Call Trace:
12 25 01:23:57 arch-laptop kernel: <TASK>
12 25 01:23:57 arch-laptop kernel: _raw_spin_lock+0x29/0x30
12 25 01:23:57 arch-laptop kernel: __list_lru_walk_one.constprop.0+0x94/0x1d0
12 25 01:23:57 arch-laptop kernel: ? __pfx_rust_shrink_free_page_wrap+0x10/0x10
12 25 01:23:57 arch-laptop kernel: ? __pfx_rust_shrink_free_page_wrap+0x10/0x10
12 25 01:23:57 arch-laptop kernel: list_lru_walk_node+0x46/0x1f0
12 25 01:23:57 arch-laptop kernel: ? __pfx_rust_shrink_free_page_wrap+0x10/0x10
12 25 01:23:57 arch-laptop kernel: rust_helper_list_lru_walk+0x9d/0xe0
12 25 01:23:57 arch-laptop kernel: do_shrink_slab+0x140/0x350
12 25 01:23:57 arch-laptop kernel: shrink_slab+0xd7/0x3e0
12 25 01:23:57 arch-laptop kernel: shrink_one+0xfe/0x1d0
12 25 01:23:57 arch-laptop kernel: shrink_node+0xb4a/0xd60
12 25 01:23:57 arch-laptop kernel: ? pgdat_balanced+0x83/0x140
12 25 01:23:57 arch-laptop kernel: kswapd+0x870/0x1100
12 25 01:23:57 arch-laptop kernel: ? __switch_to+0x103/0x3f0
12 25 01:23:57 arch-laptop kernel: ? __pfx_kswapd+0x10/0x10
12 25 01:23:57 arch-laptop kernel: kthread+0xfc/0x240
12 25 01:23:57 arch-laptop kernel: ? __pfx_kthread+0x10/0x10
12 25 01:23:57 arch-laptop kernel: ret_from_fork+0x1c2/0x1f0
12 25 01:23:57 arch-laptop kernel: ? __pfx_kthread+0x10/0x10
12 25 01:23:57 arch-laptop kernel: ret_from_fork_asm+0x1a/0x30
12 25 01:23:57 arch-laptop kernel: </TASK>
rust/helpers/binder.c：
unsigned long rust_helper_list_lru_walk(struct list_lru *lru,
list_lru_walk_cb isolate, void *cb_arg,
unsigned long nr_to_walk)
{
return list_lru_walk(lru, isolate, cb_arg, nr_to_walk);
}
It appears that there exists a patch addressing this issue:
'rust: binder: stop spinning in shrinker' [4]
I have tested this patch, and it appears to resolve the soft lockup
issue.
Could this patch be picked up to fix the regression?
[1] https://github.com/waydroid/waydroid/issues/2163
[2] https://bbs.archlinux.org/viewtopic.php?id=311223
[3] https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/174
[4] https://lore.kernel.org/all/20251202-binder-shrink-unspin-v1-1-263efb9ad625@google.com/
regards,
Ban ZuoXiang
next reply other threads:[~2025-12-28 18:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-28 18:31 Ban ZuoXiang [this message]
2025-12-29 6:57 ` [BUG] soft lockup in kswapd0 caused by Rust binder Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20251228183129.17193-1-bbaa@bbaa.fun \
--to=bbaa@bbaa.fun \
--cc=alex.gaynor@gmail.com \
--cc=aliceryhl@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=ojeda@kernel.org \
--cc=rust-for-linux@vger.kernel.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.