177 lines
11 KiB
JSON
177 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-46797",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-09-11T15:12:18.280Z",
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"datePublished": "2024-09-18T07:12:51.795Z",
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"dateUpdated": "2026-05-11T20:36:43.772Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-11T20:36:43.772Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/qspinlock: Fix deadlock in MCS queue\n\nIf an interrupt occurs in queued_spin_lock_slowpath() after we increment\nqnodesp->count and before node->lock is initialized, another CPU might\nsee stale lock values in get_tail_qnode(). If the stale lock value happens\nto match the lock on that CPU, then we write to the \"next\" pointer of\nthe wrong qnode. This causes a deadlock as the former CPU, once it becomes\nthe head of the MCS queue, will spin indefinitely until it's \"next\" pointer\nis set by its successor in the queue.\n\nRunning stress-ng on a 16 core (16EC/16VP) shared LPAR, results in\noccasional lockups similar to the following:\n\n $ stress-ng --all 128 --vm-bytes 80% --aggressive \\\n --maximize --oomable --verify --syslog \\\n --metrics --times --timeout 5m\n\n watchdog: CPU 15 Hard LOCKUP\n ......\n NIP [c0000000000b78f4] queued_spin_lock_slowpath+0x1184/0x1490\n LR [c000000001037c5c] _raw_spin_lock+0x6c/0x90\n Call Trace:\n 0xc000002cfffa3bf0 (unreliable)\n _raw_spin_lock+0x6c/0x90\n raw_spin_rq_lock_nested.part.135+0x4c/0xd0\n sched_ttwu_pending+0x60/0x1f0\n __flush_smp_call_function_queue+0x1dc/0x670\n smp_ipi_demux_relaxed+0xa4/0x100\n xive_muxed_ipi_action+0x20/0x40\n __handle_irq_event_percpu+0x80/0x240\n handle_irq_event_percpu+0x2c/0x80\n handle_percpu_irq+0x84/0xd0\n generic_handle_irq+0x54/0x80\n __do_irq+0xac/0x210\n __do_IRQ+0x74/0xd0\n 0x0\n do_IRQ+0x8c/0x170\n hardware_interrupt_common_virt+0x29c/0x2a0\n --- interrupt: 500 at queued_spin_lock_slowpath+0x4b8/0x1490\n ......\n NIP [c0000000000b6c28] queued_spin_lock_slowpath+0x4b8/0x1490\n LR [c000000001037c5c] _raw_spin_lock+0x6c/0x90\n --- interrupt: 500\n 0xc0000029c1a41d00 (unreliable)\n _raw_spin_lock+0x6c/0x90\n futex_wake+0x100/0x260\n do_futex+0x21c/0x2a0\n sys_futex+0x98/0x270\n system_call_exception+0x14c/0x2f0\n system_call_vectored_common+0x15c/0x2ec\n\nThe following code flow illustrates how the deadlock occurs.\nFor the sake of brevity, assume that both locks (A and B) are\ncontended and we call the queued_spin_lock_slowpath() function.\n\n CPU0 CPU1\n ---- ----\n spin_lock_irqsave(A) |\n spin_unlock_irqrestore(A) |\n spin_lock(B) |\n | |\n ▼ |\n id = qnodesp->count++; |\n (Note that nodes[0].lock == A) |\n | |\n ▼ |\n Interrupt |\n (happens before \"nodes[0].lock = B\") |\n | |\n ▼ |\n spin_lock_irqsave(A) |\n | |\n ▼ |\n id = qnodesp->count++ |\n nodes[1].lock = A |\n | |\n ▼ |\n Tail of MCS queue |\n | spin_lock_irqsave(A)\n ▼ |\n Head of MCS queue ▼\n | CPU0 is previous tail\n ▼ |\n Spin indefinitely ▼\n (until \"nodes[1].next != NULL\") prev = get_tail_qnode(A, CPU0)\n |\n ▼\n prev == &qnodes[CPU0].nodes[0]\n (as qnodes\n---truncated---"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/powerpc/lib/qspinlock.c"
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],
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"versions": [
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{
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"version": "84990b169557428c318df87b7836cd15f65b62dc",
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"lessThan": "d84ab6661e8d09092de9b034b016515ef9b66085",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "84990b169557428c318df87b7836cd15f65b62dc",
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"lessThan": "f06af737e4be28c0e926dc25d5f0a111da4e2987",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "84990b169557428c318df87b7836cd15f65b62dc",
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"lessThan": "734ad0af3609464f8f93e00b6c0de1e112f44559",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/powerpc/lib/qspinlock.c"
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],
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"versions": [
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{
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"version": "6.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.51",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.10.10",
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"lessThanOrEqual": "6.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.6.51"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.10.10"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.11"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/d84ab6661e8d09092de9b034b016515ef9b66085"
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},
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{
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"url": "https://git.kernel.org/stable/c/f06af737e4be28c0e926dc25d5f0a111da4e2987"
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},
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{
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"url": "https://git.kernel.org/stable/c/734ad0af3609464f8f93e00b6c0de1e112f44559"
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}
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],
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"title": "powerpc/qspinlock: Fix deadlock in MCS queue",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2024-09-29T14:22:25.653688Z",
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"id": "CVE-2024-46797",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-29T14:22:38.796Z"
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}
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}
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]
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}
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} |