{"id":"CVE-2024-56585","summary":"LoongArch: Fix sleeping in atomic context for PREEMPT_RT","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Fix sleeping in atomic context for PREEMPT_RT\n\nCommit bab1c299f3945ffe79 (\"LoongArch: Fix sleeping in atomic context in\nsetup_tlb_handler()\") changes the gfp flag from GFP_KERNEL to GFP_ATOMIC\nfor alloc_pages_node(). However, for PREEMPT_RT kernels we can still get\na \"sleeping in atomic context\" error:\n\n[    0.372259] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48\n[    0.372266] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1\n[    0.372268] preempt_count: 1, expected: 0\n[    0.372270] RCU nest depth: 1, expected: 1\n[    0.372272] 3 locks held by swapper/1/0:\n[    0.372274]  #0: 900000000c9f5e60 (&pcp-\u003elock){+.+.}-{3:3}, at: get_page_from_freelist+0x524/0x1c60\n[    0.372294]  #1: 90000000087013b8 (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x50/0x140\n[    0.372305]  #2: 900000047fffd388 (&zone-\u003elock){+.+.}-{3:3}, at: __rmqueue_pcplist+0x30c/0xea0\n[    0.372314] irq event stamp: 0\n[    0.372316] hardirqs last  enabled at (0): [\u003c0000000000000000\u003e] 0x0\n[    0.372322] hardirqs last disabled at (0): [\u003c9000000005947320\u003e] copy_process+0x9c0/0x26e0\n[    0.372329] softirqs last  enabled at (0): [\u003c9000000005947320\u003e] copy_process+0x9c0/0x26e0\n[    0.372335] softirqs last disabled at (0): [\u003c0000000000000000\u003e] 0x0\n[    0.372341] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.12.0-rc7+ #1891\n[    0.372346] Hardware name: Loongson Loongson-3A5000-7A1000-1w-CRB/Loongson-LS3A5000-7A1000-1w-CRB, BIOS vUDK2018-LoongArch-V2.0.0-prebeta9 10/21/2022\n[    0.372349] Stack : 0000000000000089 9000000005a0db9c 90000000071519c8 9000000100388000\n[    0.372486]         900000010038b890 0000000000000000 900000010038b898 9000000007e53788\n[    0.372492]         900000000815bcc8 900000000815bcc0 900000010038b700 0000000000000001\n[    0.372498]         0000000000000001 4b031894b9d6b725 00000000055ec000 9000000100338fc0\n[    0.372503]         00000000000000c4 0000000000000001 000000000000002d 0000000000000003\n[    0.372509]         0000000000000030 0000000000000003 00000000055ec000 0000000000000003\n[    0.372515]         900000000806d000 9000000007e53788 00000000000000b0 0000000000000004\n[    0.372521]         0000000000000000 0000000000000000 900000000c9f5f10 0000000000000000\n[    0.372526]         90000000076f12d8 9000000007e53788 9000000005924778 0000000000000000\n[    0.372532]         00000000000000b0 0000000000000004 0000000000000000 0000000000070000\n[    0.372537]         ...\n[    0.372540] Call Trace:\n[    0.372542] [\u003c9000000005924778\u003e] show_stack+0x38/0x180\n[    0.372548] [\u003c90000000071519c4\u003e] dump_stack_lvl+0x94/0xe4\n[    0.372555] [\u003c900000000599b880\u003e] __might_resched+0x1a0/0x260\n[    0.372561] [\u003c90000000071675cc\u003e] rt_spin_lock+0x4c/0x140\n[    0.372565] [\u003c9000000005cbb768\u003e] __rmqueue_pcplist+0x308/0xea0\n[    0.372570] [\u003c9000000005cbed84\u003e] get_page_from_freelist+0x564/0x1c60\n[    0.372575] [\u003c9000000005cc0d98\u003e] __alloc_pages_noprof+0x218/0x1820\n[    0.372580] [\u003c900000000593b36c\u003e] tlb_init+0x1ac/0x298\n[    0.372585] [\u003c9000000005924b74\u003e] per_cpu_trap_init+0x114/0x140\n[    0.372589] [\u003c9000000005921964\u003e] cpu_probe+0x4e4/0xa60\n[    0.372592] [\u003c9000000005934874\u003e] start_secondary+0x34/0xc0\n[    0.372599] [\u003c900000000715615c\u003e] smpboot_entry+0x64/0x6c\n\nThis is because in PREEMPT_RT kernels normal spinlocks are replaced by\nrt spinlocks and rt_spin_lock() will cause sleeping. Fix it by disabling\nNUMA optimization completely for PREEMPT_RT kernels.","modified":"2026-04-02T12:24:53.024156Z","published":"2024-12-27T14:50:53.471Z","related":["MGASA-2025-0030","MGASA-2025-0032"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56585.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/08715b741f9b2a925d6485491e4907f3b29bac70"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6575e0867bd478a5d7ef1783ca1e73160807d238"},{"type":"WEB","url":"https://git.kernel.org/stable/c/88fd2b70120d52c1010257d36776876941375490"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5f89458a2ea0800866b9fc690d3fa8367dc8f8d"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56585.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56585"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fa96b57c149061f71a70bd6582d995f6424fbbf4"},{"fixed":"08715b741f9b2a925d6485491e4907f3b29bac70"},{"fixed":"c5f89458a2ea0800866b9fc690d3fa8367dc8f8d"},{"fixed":"6575e0867bd478a5d7ef1783ca1e73160807d238"},{"fixed":"88fd2b70120d52c1010257d36776876941375490"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56585.json"}}],"schema_version":"1.7.5"}