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bh=rKRx15FD2P/QOgmgNHJNUluLSu+ZDBdt6FLosJXwNHo=; b=qG5fQABQDLPwVYspu7sokridPGdCarHaVk/YsP/jmy1/JVs5GmCSrcoqC7BiUgQ6pTAAXGG86nA 1c7br95I7cFSV981UethC6YacFYIf6cO2g5KXKZti2LhtBlZeLUrn07kYJJFo86aIFD/rdqxZ+kWi j4JCo+1tVwzTEMeKBpM4TkcBz5IzKu81UpAOP2bQXebUupQiqMsBQN8i33quvcdgPt7On7R5pZt0K a492IswbBUWNYmYbkheONjaJ+npZPw2CQexJeQwcgjXejniZ5M5qWtZRBzpfj5Jd0AaDgDZm1SKW1 /6AriuH2KmXAKZ/A536qlWVJQwaPyUEdcE6Q== From: Ban ZuoXiang 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 Message-ID: <20251228183129.17193-1-bbaa@bbaa.fun> X-Mailer: git-send-email 2.52.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Originating-IP: 162.244.93.81 X-SpamExperts-Domain: mxyeet.net X-SpamExperts-Username: smartermail X-SpamExperts-Outgoing-Class: ham X-SpamExperts-Outgoing-Evidence: SB/global_tokens (5.7092575112e-10) X-Recommended-Action: accept X-Filter-ID: 9kzQTOBWQUFZTohSKvQbgI7ZDo5ubYELi59AwcWUnuUt70AhH2huZ0hssZU6iaDLChjzQ3JIZVFF 8HV60IETFiu2SmbhJN1U9FKs8X3+Nt0FOl+ASFczY3noAPKuEEJhQHJfqQ64nI8OXcHHUR+UmMUI LYktuu3IV7f0/T27Pqkk4Ndu06h2Q8QP5GQeNUYf+DoI5ero3AmhIYfztx7bKQZmnW/XN+tohdLu D74c7RLm7rJaFabHdhRB1M5CpEevg8CBO1Snvm6qXHQp7O9kdY+UD7VHHpDYs+rEjiTXe4WKt+mB C7rFaes5rZKd35vJLDnQGgRgHjioU8fpt7xeC6lpK5rmsikWQyHoo01Us4Z1thv0hd9gZGlVL/SE DgzCG0XIswT4JTPNkebrIx8pyA5U9t4xcCUOm4tiv78RtCq8Ng3mYqtflZjDsBc5em/VPnrhyYEC sIe6J6jqDToibXfgD3PWF0irxjKk3/vWv1cHLUesOFho5kJn+h8T97+juMI5o/7ag+7fAeZ/0D/o aBtPVai8IsFJldnpxNC5oFbU9F4QK/47LgCAS8YT+zZ/XG4tO8kCg1cp84iMSAkGFeL+EuOJL/c5 tJIVZhWv3apX07NPEMssOkqNyDaeeBep7MoHOmPp3YnNtmvPmSihMlNiLZt/QXQnOBRD+jq1HsIc b3vTWnDYyVC7/iU3LFoRU2Itm39BdCc4FEP6OrUewhMp7l2H6L1j3xQGrt05tlcy8V5TAE2MyU4x O6WjOUIW31/E3ahF5MMcDI7KdpjQKR1rRW2/Ber2PqroG23nxx1rW6geRibv9v24o8pyO+wfXw0w ikvZkulDqcrpWCoB+LaiUF9sHh1/NzLB7qIs483Nybl56sya0T9xEzVY363yx78pxU3yUjGNzx/G kJD0Lh/LIV1YxiRB+4L7xN5erWmQp6iQOcylg4zeIfjQL4cweUvsRehKMiBHeoTRkEMdtEl4PpOg bCAYLr2RF7WRTTfrce/yja8lj1X9smfLvXyMwCcp22CVjbX1GnCNi2ASYKPEJRIe0r/ece53u7ka x2AppUMd0V4zQuQzp0OBP9wD9B1rqsxWtMmzF3PUhbYHSFFfEoXm0/FPF8PR0w363lmTwJvcF16P 8f5DknwNiAeqQWy02jken2lZ8tkIY+F6Z1bs1b+lPl6frsX3AK4aOFP5fYhnc+Ng6LSN+h+4QfaY Fuupjn2+p/TJWBvLviE0/0eN5gq2WsqFjibD3Odqt6z+KvZJ30NG3C5Vc/q0wxSGAk9jZlOhtXWT K6eQfdZUmg== X-Report-Abuse-To: spam@mx1.mxfilter.net X-Complaints-To: abuse@mx1.mxfilter.net X-Rspamd-Queue-Id: 91DB9A000B X-Stat-Signature: b6qz5dc3m6x3r9461w7z96m3mmojb3u7 X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1766946718-367383 X-HE-Meta: U2FsdGVkX18cANJ2WCYr4wHvTWPr/eHOjRCR7ZZtdGMIf76dqx51/yCx52RD6iVKUugXc/Ne6bKO6NMazy0ZFdGniQEPYo+x7ZFR/ngtauod2K06pi4G1TPowcTU6LqpavU9j22eqUcqteuC9vQqfujhOKGsLA2dTkAaAsPBHgekbrL6PPR1BXRFm9/9pqjUsdiscR8bTIYXezdV0bVoW1p29o02/HZeKgjFmdWlNi4utsf9lT4KdDhbhbrYlHWr7z3vkG8ql9DjyYPEL3miN7Lc/79K6s0SNX1K+WwzqjbzEx3LRjemqjryvqX0Fx68qBIeAwAN9msW/HKkmnXvXN7dPGdt5cmXvY0NA41tbQKOtPx0QJFEegKGwS1+dn86CT/+TQpVP83hwpBRvWfI2fa4+jDILZT3V6rA53mZkOWKUPwnMTa/FTFrEH2zVi8vRKRuJ41c5DT3aKL+g9C2P8eafnvz3eAuaDxKu5fL7YJhPm7r8DvIrAg1A/ba0fGvTDQUfRuteLBecPTXdpBnzOPneIQY/r3NsK+O0ffs8lOHxIu4269oBEikRj4q7s1d5LBWumR4tDecslev/oNmH1XTBLzfmi+Ay9szklgCPA4MJAfQItMKt8P3UrP55EvX+5lUEhJpzANPR6n6UfoEEA3LFKgX/YvNQYSF4aiPxbouMJge12FECqyqLrl6LTaqhF/tDp2vS1WuGA/+GkCHhTEO/9+Nxg3GlR8MoT9mxex3MR74n/qZ5tAFd2VdjePxezrFOn6e7NJdwb9D8iUCsDOYc+mrzNwnwxRXZnoNkHq91VTj1Gk1hmSL8VhtOB7dgGQZGXnJtyVxarOYoYmN94NECjXlREXjIat6WgLrlC0HCG11Yrhn6zd7NrlNr9PU7aygkyRSqSpvrvdZSd39woRT/9Z4+AsXVHoU+p1iql38GoJeDCgB7gvHJ+ci+44bZC7osgI0hS6GwCCxZHv 6kUSbV+8 nBcBLt+TrhN2kJ4FqSGgQZ1iS4F316m6CKlWJNWBjCAAEXLUdgGr/I0wEQ58hoxqficrJ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello,=20 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 lo= ckup: 12 25 01:23:57 arch-laptop kernel: #1: 100% system, 0% sof= tirq, 1% hardirq, 0% idle 12 25 01:23:57 arch-laptop kernel: #2: 100% system, 0% sof= tirq, 1% hardirq, 0% idle 12 25 01:23:57 arch-laptop kernel: #3: 100% system, 0% sof= tirq, 1% hardirq, 0% idle 12 25 01:23:57 arch-laptop kernel: #4: 100% system, 0% sof= tirq, 1% hardirq, 0% idle 12 25 01:23:57 arch-laptop kernel: #5: 100% system, 0% sof= tirq, 1% hardirq, 0% idle 12 25 01:23:57 arch-laptop kernel: Modules linked in: sch_ingress af_key tc= p_diag udp_diag inet_diag nfnetlink_log xfrm_user xfrm_algo xfrm_interface = xfrm6_tunnel tunnel4 tunnel6 vsock_loopback vmw_vsock_virtio_transport_comm= on vmw_vsock_vmci_transport vsock vmw_vmci veth overlay loop nft_masq nft_c= hain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bridge stp llc n= f_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_r= apl_common mac80211 ptp pps_core libarc4 amdxcp snd_hda_codec_nvhdmi drm_pa= nel_backlight_quirks snd_hda_codec_hdmi gpu_sched snd_usb_audio drm_buddy i= wlwifi 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 i= 2c_algo_bit snd_ump videobuf2_memops asus_nb_wmi typec_ucsi snd_intel_dspcf= g 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_dis= play_helper snd_intel_sdw_acpi asus_wmi libphy typec videobuf2_common i2c_p= iix4 btintel aesni_intel snd_hwdep snd_seq_device amdtee hid_multitouch blu= etooth videodev cec wmi_bmof sparse_keymap rapl pcspkr roles ccp k10temp rf= kill video i2c_smbus mdio_bus amd_sfh snd_pcm thunderbolt i2c_hid_acpi plat= form_profile snd_timer wmi i2c_hid tee snd amd_pmc soundcore mc mousedev jo= ydev mac_hid tcp_bbr sch_fq_pie sch_pie i2c_dev pkcs8_key_parser ntsync cry= pto_user nfnetlink hid_logitech_hidpp hid_logitech_dj nvme nvme_core nvme_k= eyring 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) 817688afc19ca15a22737742591535= 351aba70f8 12 25 01:23:57 arch-laptop kernel: Hardware name: ASUSTeK COMPUTER INC. ASU= S 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_slowpa= th+0x67/0x2e0 12 25 01:23:57 arch-laptop kernel: Code: 0f 92 c2 8b 01 0f b6 d2 c1 e2 08 3= 0 e4 09 d0 3d ff 00 00 00 0f 87 1e 02 00 00 85 c0 74 10 0f b6 01 84 c0 74 0= 9 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: 00000= 202 12 25 01:23:57 arch-laptop kernel: RAX: 0000000000000001 RBX: ffffd4c4c06e3= b10 RCX: ffff8d69446aa698 12 25 01:23:57 arch-laptop kernel: RDX: 0000000000000000 RSI: 0000000000000= 001 RDI: ffff8d69446aa698 12 25 01:23:57 arch-laptop kernel: RBP: ffffffff94118f38 R08: 0000000000000= 000 R09: 0000000000000000 12 25 01:23:57 arch-laptop kernel: R10: ffff8d6fa1e38340 R11: ffff8d6fbe2d6= 000 R12: ffff8d6c5aaf8000 12 25 01:23:57 arch-laptop kernel: R13: ffffffff91d15410 R14: ffff8d69446aa= 680 R15: ffff8d69446aa680 12 25 01:23:57 arch-laptop kernel: FS: 0000000000000000(0000) GS:ffff8d700= deaf000(0000) knlGS:0000000000000000 12 25 01:23:57 arch-laptop kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000= 080050033 12 25 01:23:57 arch-laptop kernel: CR2: 00000000100af568 CR3: 000000020da24= 000 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: 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+0x94/0x= 1d0 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: rust/helpers/binder.c=EF=BC=9A 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:=20 'rust: binder: stop spinning in shrinker' [4]=20 I have tested this patch, and it appears to resolve the soft lockup issue.=20 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=3D311223 [3] https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issue= s/174 [4] https://lore.kernel.org/all/20251202-binder-shrink-unspin-v1-1-263efb9a= d625@google.com/ regards, Ban ZuoXiang