KASAN: use-after-free Read in __vma_adjust

KASAN: use-after-free Read in __vma_adjust

Status: upstream: reported C repro on 2022/06/12 10:38
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+68771c0e74f7bb7804e5@syzkaller.appspotmail.com
Fix commit: fs/userfaultfd: fix vma iteration in mas_for_each() loop
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 1460d, last: 1404d

Cause bisection: introduced by (bisect log) :
commit d3ccd17e7c9647b956d415acdf3e3fde7ae9e20c
Author: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Thu Jun 9 20:57:09 2022 +0000

mm: start tracking VMAs with maple tree

Crash: KASAN: use-after-free Read in __vma_adjust (log)
Repro: C syz .config

▶ ▼ ✨ AI Jobs (3)

ID	Workflow	Result	Correct	Ext Bug ID	Bug	Created	Started	Finished	Revision	Error
2ba7076c-1422-4a33-8a69-a71c2694421a	assessment-security		💥		KASAN: use-after-free Read in __vma_adjust	2026/06/09 18:32	2026/06/09 18:32	2026/06/09 18:51	c36c07f6c1f2230a36374cbd22235f635e8f9284	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cda63193ee5c81e53949b6a75c6f27e9acadfee0" "-s" "bzImage" "compile_commands.json"]: exit status 2 Root cause: scripts/clang-tools/gen_compile_commands.py:187: SyntaxWarning: invalid escape sequence '\#' ld.lld: error: undefined symbol: wcslen * * Restart config... * * * Processor type and features * Symmetric multi-processing support (SMP) [Y/n/?] y Support x2apic (X86_X2APIC) [N/y/?] n Enable MPS table (X86_MPPARSE) [Y/n/?] y Avoid speculative indirect branches in kernel (RETPOLINE) [N/y/?] n Mitigate Straight-Line-Speculation (SLS) [N/y/?] (NEW) Error in reading or end of file. x86 CPU resource control support (X86_CPU_RESCTRL) [N/y/?] n Support for extended (non-PC) x86 platforms (X86_EXTENDED_PLATFORM) [Y/n/?] y ScaleMP vSMP (X86_VSMP) [N/y/?] n Goldfish (Virtual Platform) (X86_GOLDFISH) [N/y/?] n Intel MID platform support (X86_INTEL_MID) [N/y/?] n Intel Low Power Subsystem Support (X86_INTEL_LPSS) [N/y/?] n AMD ACPI2Platform devices support (X86_AMD_PLATFORM_DEVICE) [N/y/?] n Intel SoC IOSF Sideband support for SoC platforms (IOSF_MBI) [Y/n/m/?] y Enable IOSF sideband access through debugfs (IOSF_MBI_DEBUG) [N/y/?] n Single-depth WCHAN output (SCHED_OMIT_FRAME_POINTER) [Y/n/?] y Processor family 1. Opteron/Athlon64/Hammer/K8 (MK8) 2. Intel P4 / older Netburst based Xeon (MPSC) > 3. Core 2/newer Xeon (MCORE2) 4. Intel Atom (MATOM) 5. Generic-x86-64 (GENERIC_CPU) choice[1-5?]: 3 Enable DMI scanning (DMI) [Y/n/?] y Old AMD GART IOMMU support (GART_IOMMU) [N/y/?] n Enable Maximum number of SMP Processors and NUMA Nodes (MAXSMP) [N/y/?] n Maximum number of CPUs (NR_CPUS) [8] 8 Cluster scheduler support (SCHED_CLUSTER) [Y/n/?] y Multi-core scheduler support (SCHED_MC) [Y/n/?] y CPU core priorities scheduler support (SCHED_MC_PRIO) [Y/n/?] y Reroute for broken boot IRQs (X86_REROUTE_FOR_BROKEN_BOOT_IRQS) [Y/n/?] y Machine Check / overheating reporting (X86_MCE) [Y/n/?] y Support for deprecated /dev/mcelog character device (X86_MCELOG_LEGACY) [N/y/?] n Intel MCE features (X86_MCE_INTEL) [Y/n/?] y AMD MCE features (X86_MCE_AMD) [Y/n/?] y Machine check injector support (X86_MCE_INJECT) [N/m/y/?] n Enable support for 16-bit segments (X86_16BIT) [Y/n/?] y Enable vsyscall emulation (X86_VSYSCALL_EMULATION) [Y/n/?] y IOPERM and IOPL Emulation (X86_IOPL_IOPERM) [Y/n/?] y CPU microcode loading support (MICROCODE) [Y/n/?] y Intel microcode loading support (MICROCODE_INTEL) [Y/n/?] y AMD microcode loading support (MICROCODE_AMD) [Y/n/?] y Late microcode loading (DANGEROUS) (MICROCODE_LATE_LOADING) [N/y/?] n /dev/cpu//msr - Model-specific register support (X86_MSR) [Y/n/m/?] y /dev/cpu//cpuid - CPU information support (X86_CPUID) [Y/n/m/?] y Enable 5-level page tables support (X86_5LEVEL) [N/y/?] n Enable statistic for Change Page Attribute (X86_CPA_STATISTICS) [N/y/?] n AMD Secure Memory Encryption (SME) support (AMD_MEM_ENCRYPT) [N/y/?] n NUMA Memory Allocation and Scheduler Support (NUMA) [Y/n/?] y Old style AMD Opteron NUMA detection (AMD_NUMA) [Y/n/?] y ACPI NUMA detection (X86_64_ACPI_NUMA) [Y/n/?] y NUMA emulation (NUMA_EMU) [Y/n/?] y Maximum NUMA Nodes (as a power of 2) (NODES_SHIFT) [6] 6 Enable sysfs memory/probe interface (ARCH_MEMORY_PROBE) [N/y/?] n Support non-standard NVDIMMs and ADR protected memory (X86_PMEM_LEGACY) [N/m/y/?] n Check for low memory corruption (X86_CHECK_BIOS_CORRUPTION) [N/y/?] n MTRR (Memory Type Range Register) support (MTRR) [Y/n/?] y MTRR cleanup support (MTRR_SANITIZER) [N/y/?] n x86 PAT support (X86_PAT) [Y/n/?] y x86 architectural random number generator (ARCH_RANDOM) [Y/n/?] y User Mode Instruction Prevention (X86_UMIP) [Y/n/?] y Indirect Branch Tracking (X86_KERNEL_IBT) [N/y/?] n Memory Protection Keys (X86_INTEL_MEMORY_PROTECTION_KEYS) [Y/n/?] y TSX enable mode 1. off (X86_INTEL_TSX_MODE_OFF) > 2. on (X86_INTEL_TSX_MODE_ON) 3. auto (X86_INTEL_TSX_MODE_AUTO) choice[1-3?
d3845542-8b17-4854-82e1-b83271ec5273	assessment-security		💥		KASAN: use-after-free Read in __vma_adjust	2026/06/02 15:47	2026/06/02 15:47	2026/06/02 16:09	62fe15281f5011cd203d8845b8767b10e7443aa5	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cda63193ee5c81e53949b6a75c6f27e9acadfee0" "-s" "bzImage" "compile_commands.json"]: exit status 2 Root cause: scripts/clang-tools/gen_compile_commands.py:187: SyntaxWarning: invalid escape sequence '\#' ld.lld: error: undefined symbol: wcslen * * Restart config... * * * Processor type and features * Symmetric multi-processing support (SMP) [Y/n/?] y Support x2apic (X86_X2APIC) [N/y/?] n Enable MPS table (X86_MPPARSE) [Y/n/?] y Avoid speculative indirect branches in kernel (RETPOLINE) [N/y/?] n Mitigate Straight-Line-Speculation (SLS) [N/y/?] (NEW) Error in reading or end of file. x86 CPU resource control support (X86_CPU_RESCTRL) [N/y/?] n Support for extended (non-PC) x86 platforms (X86_EXTENDED_PLATFORM) [Y/n/?] y ScaleMP vSMP (X86_VSMP) [N/y/?] n Goldfish (Virtual Platform) (X86_GOLDFISH) [N/y/?] n Intel MID platform support (X86_INTEL_MID) [N/y/?] n Intel Low Power Subsystem Support (X86_INTEL_LPSS) [N/y/?] n AMD ACPI2Platform devices support (X86_AMD_PLATFORM_DEVICE) [N/y/?] n Intel SoC IOSF Sideband support for SoC platforms (IOSF_MBI) [Y/n/m/?] y Enable IOSF sideband access through debugfs (IOSF_MBI_DEBUG) [N/y/?] n Single-depth WCHAN output (SCHED_OMIT_FRAME_POINTER) [Y/n/?] y Processor family 1. Opteron/Athlon64/Hammer/K8 (MK8) 2. Intel P4 / older Netburst based Xeon (MPSC) > 3. Core 2/newer Xeon (MCORE2) 4. Intel Atom (MATOM) 5. Generic-x86-64 (GENERIC_CPU) choice[1-5?]: 3 Enable DMI scanning (DMI) [Y/n/?] y Old AMD GART IOMMU support (GART_IOMMU) [N/y/?] n Enable Maximum number of SMP Processors and NUMA Nodes (MAXSMP) [N/y/?] n Maximum number of CPUs (NR_CPUS) [8] 8 Cluster scheduler support (SCHED_CLUSTER) [Y/n/?] y Multi-core scheduler support (SCHED_MC) [Y/n/?] y CPU core priorities scheduler support (SCHED_MC_PRIO) [Y/n/?] y Reroute for broken boot IRQs (X86_REROUTE_FOR_BROKEN_BOOT_IRQS) [Y/n/?] y Machine Check / overheating reporting (X86_MCE) [Y/n/?] y Support for deprecated /dev/mcelog character device (X86_MCELOG_LEGACY) [N/y/?] n Intel MCE features (X86_MCE_INTEL) [Y/n/?] y AMD MCE features (X86_MCE_AMD) [Y/n/?] y Machine check injector support (X86_MCE_INJECT) [N/m/y/?] n Enable support for 16-bit segments (X86_16BIT) [Y/n/?] y Enable vsyscall emulation (X86_VSYSCALL_EMULATION) [Y/n/?] y IOPERM and IOPL Emulation (X86_IOPL_IOPERM) [Y/n/?] y CPU microcode loading support (MICROCODE) [Y/n/?] y Intel microcode loading support (MICROCODE_INTEL) [Y/n/?] y AMD microcode loading support (MICROCODE_AMD) [Y/n/?] y Late microcode loading (DANGEROUS) (MICROCODE_LATE_LOADING) [N/y/?] n /dev/cpu//msr - Model-specific register support (X86_MSR) [Y/n/m/?] y /dev/cpu//cpuid - CPU information support (X86_CPUID) [Y/n/m/?] y Enable 5-level page tables support (X86_5LEVEL) [N/y/?] n Enable statistic for Change Page Attribute (X86_CPA_STATISTICS) [N/y/?] n AMD Secure Memory Encryption (SME) support (AMD_MEM_ENCRYPT) [N/y/?] n NUMA Memory Allocation and Scheduler Support (NUMA) [Y/n/?] y Old style AMD Opteron NUMA detection (AMD_NUMA) [Y/n/?] y ACPI NUMA detection (X86_64_ACPI_NUMA) [Y/n/?] y NUMA emulation (NUMA_EMU) [Y/n/?] y Maximum NUMA Nodes (as a power of 2) (NODES_SHIFT) [6] 6 Enable sysfs memory/probe interface (ARCH_MEMORY_PROBE) [N/y/?] n Support non-standard NVDIMMs and ADR protected memory (X86_PMEM_LEGACY) [N/m/y/?] n Check for low memory corruption (X86_CHECK_BIOS_CORRUPTION) [N/y/?] n MTRR (Memory Type Range Register) support (MTRR) [Y/n/?] y MTRR cleanup support (MTRR_SANITIZER) [N/y/?] n x86 PAT support (X86_PAT) [Y/n/?] y x86 architectural random number generator (ARCH_RANDOM) [Y/n/?] y User Mode Instruction Prevention (X86_UMIP) [Y/n/?] y Indirect Branch Tracking (X86_KERNEL_IBT) [N/y/?] n Memory Protection Keys (X86_INTEL_MEMORY_PROTECTION_KEYS) [Y/n/?] y TSX enable mode 1. off (X86_INTEL_TSX_MODE_OFF) > 2. on (X86_INTEL_TSX_MODE_ON) 3. auto (X86_INTEL_TSX_MODE_AUTO) choice[1-3?
ba9c4492-0912-49cc-9a55-69bbce640577	assessment-security		💥		KASAN: use-after-free Read in __vma_adjust	2026/05/25 21:00	2026/05/25 21:00	2026/05/25 21:22	c69befb30ac10e158cc9d1557b508ee3f0eca1de	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cda63193ee5c81e53949b6a75c6f27e9acadfee0" "-s" "bzImage" "compile_commands.json"]: exit status 2 Root cause: scripts/clang-tools/gen_compile_commands.py:187: SyntaxWarning: invalid escape sequence '\#' ld.lld: error: undefined symbol: wcslen * * Restart config... * * * Processor type and features * Symmetric multi-processing support (SMP) [Y/n/?] y Support x2apic (X86_X2APIC) [N/y/?] n Enable MPS table (X86_MPPARSE) [Y/n/?] y Avoid speculative indirect branches in kernel (RETPOLINE) [N/y/?] n Mitigate Straight-Line-Speculation (SLS) [N/y/?] (NEW) Error in reading or end of file. x86 CPU resource control support (X86_CPU_RESCTRL) [N/y/?] n Support for extended (non-PC) x86 platforms (X86_EXTENDED_PLATFORM) [Y/n/?] y ScaleMP vSMP (X86_VSMP) [N/y/?] n Goldfish (Virtual Platform) (X86_GOLDFISH) [N/y/?] n Intel MID platform support (X86_INTEL_MID) [N/y/?] n Intel Low Power Subsystem Support (X86_INTEL_LPSS) [N/y/?] n AMD ACPI2Platform devices support (X86_AMD_PLATFORM_DEVICE) [N/y/?] n Intel SoC IOSF Sideband support for SoC platforms (IOSF_MBI) [Y/n/m/?] y Enable IOSF sideband access through debugfs (IOSF_MBI_DEBUG) [N/y/?] n Single-depth WCHAN output (SCHED_OMIT_FRAME_POINTER) [Y/n/?] y Processor family 1. Opteron/Athlon64/Hammer/K8 (MK8) 2. Intel P4 / older Netburst based Xeon (MPSC) > 3. Core 2/newer Xeon (MCORE2) 4. Intel Atom (MATOM) 5. Generic-x86-64 (GENERIC_CPU) choice[1-5?]: 3 Enable DMI scanning (DMI) [Y/n/?] y Old AMD GART IOMMU support (GART_IOMMU) [N/y/?] n Enable Maximum number of SMP Processors and NUMA Nodes (MAXSMP) [N/y/?] n Maximum number of CPUs (NR_CPUS) [8] 8 Cluster scheduler support (SCHED_CLUSTER) [Y/n/?] y Multi-core scheduler support (SCHED_MC) [Y/n/?] y CPU core priorities scheduler support (SCHED_MC_PRIO) [Y/n/?] y Reroute for broken boot IRQs (X86_REROUTE_FOR_BROKEN_BOOT_IRQS) [Y/n/?] y Machine Check / overheating reporting (X86_MCE) [Y/n/?] y Support for deprecated /dev/mcelog character device (X86_MCELOG_LEGACY) [N/y/?] n Intel MCE features (X86_MCE_INTEL) [Y/n/?] y AMD MCE features (X86_MCE_AMD) [Y/n/?] y Machine check injector support (X86_MCE_INJECT) [N/m/y/?] n Enable support for 16-bit segments (X86_16BIT) [Y/n/?] y Enable vsyscall emulation (X86_VSYSCALL_EMULATION) [Y/n/?] y IOPERM and IOPL Emulation (X86_IOPL_IOPERM) [Y/n/?] y CPU microcode loading support (MICROCODE) [Y/n/?] y Intel microcode loading support (MICROCODE_INTEL) [Y/n/?] y AMD microcode loading support (MICROCODE_AMD) [Y/n/?] y Late microcode loading (DANGEROUS) (MICROCODE_LATE_LOADING) [N/y/?] n /dev/cpu//msr - Model-specific register support (X86_MSR) [Y/n/m/?] y /dev/cpu//cpuid - CPU information support (X86_CPUID) [Y/n/m/?] y Enable 5-level page tables support (X86_5LEVEL) [N/y/?] n Enable statistic for Change Page Attribute (X86_CPA_STATISTICS) [N/y/?] n AMD Secure Memory Encryption (SME) support (AMD_MEM_ENCRYPT) [N/y/?] n NUMA Memory Allocation and Scheduler Support (NUMA) [Y/n/?] y Old style AMD Opteron NUMA detection (AMD_NUMA) [Y/n/?] y ACPI NUMA detection (X86_64_ACPI_NUMA) [Y/n/?] y NUMA emulation (NUMA_EMU) [Y/n/?] y Maximum NUMA Nodes (as a power of 2) (NODES_SHIFT) [6] 6 Enable sysfs memory/probe interface (ARCH_MEMORY_PROBE) [N/y/?] n Support non-standard NVDIMMs and ADR protected memory (X86_PMEM_LEGACY) [N/m/y/?] n Check for low memory corruption (X86_CHECK_BIOS_CORRUPTION) [N/y/?] n MTRR (Memory Type Range Register) support (MTRR) [Y/n/?] y MTRR cleanup support (MTRR_SANITIZER) [N/y/?] n x86 PAT support (X86_PAT) [Y/n/?] y x86 architectural random number generator (ARCH_RANDOM) [Y/n/?] y User Mode Instruction Prevention (X86_UMIP) [Y/n/?] y Indirect Branch Tracking (X86_KERNEL_IBT) [N/y/?] n Memory Protection Keys (X86_INTEL_MEMORY_PROTECTION_KEYS) [Y/n/?] y TSX enable mode 1. off (X86_INTEL_TSX_MODE_OFF) > 2. on (X86_INTEL_TSX_MODE_ON) 3. auto (X86_INTEL_TSX_MODE_AUTO) choice[1-3?

▶ ▼ Discussions (2)

Title	Replies (including bot)	Last reply
[syzbot] KASAN: use-after-free Read in __vma_adjust	1 (3)	2022/06/15 16:45
[PATCH] fs/userfaultfd: Fix vma iteration in mas_for_each() loop	1 (1)	2022/06/15 16:42

▶ ▼ Last patch testing requests (2)


Created	Duration	User	Patch	Repo	Result
2022/06/14 10:50	18m	hdanton@sina.com	patch	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 6d0c80680317	OK log
2022/06/13 10:47	9m	hdanton@sina.com	patch	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 6d0c80680317	report log

Sample crash report:

==================================================================
BUG: KASAN: use-after-free in __vma_adjust+0x18ee/0x1900 mm/mmap.c:763
Read of size 8 at addr ffff88801fefe208 by task syz-executor408/3621

CPU: 0 PID: 3621 Comm: syz-executor408 Not tainted 5.19.0-rc1-next-20220610-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 __vma_adjust+0x18ee/0x1900 mm/mmap.c:763
 vma_merge+0x590/0x870 mm/mmap.c:1119
 userfaultfd_release+0x4c5/0x670 fs/userfaultfd.c:888
 __fput+0x277/0x9d0 fs/file_table.c:317
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 ptrace_notify+0x114/0x140 kernel/signal.c:2353
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work kernel/entry/common.c:249 [inline]
 syscall_exit_to_user_mode_prepare+0xdb/0x230 kernel/entry/common.c:276
 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
 syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f2d02e9ef59
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2d02e502f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 00007f2d02f284a8 RCX: 00007f2d02e9ef59
RDX: 000000000000003c RSI: 0000000020000180 RDI: 0000000000000003
RBP: 00007f2d02f284a0 R08: 0000000000000001 R09: 0000000000000034
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d02e50300
R13: 0000000000000001 R14: 00007f2d02e50400 R15: 0000000000022000
 </TASK>

Allocated by task 3619:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:750 [inline]
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3222 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3229 [inline]
 kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3239
 vm_area_dup+0x81/0x380 kernel/fork.c:466
 dup_mmap+0x656/0x1090 kernel/fork.c:640
 dup_mm+0x91/0x370 kernel/fork.c:1520
 copy_mm kernel/fork.c:1569 [inline]
 copy_process+0x3c95/0x7080 kernel/fork.c:2234
 kernel_clone+0xe7/0xab0 kernel/fork.c:2649
 __do_sys_clone+0xba/0x100 kernel/fork.c:2783
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 3621:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1727 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753
 slab_free mm/slub.c:3507 [inline]
 kmem_cache_free+0xdd/0x5a0 mm/slub.c:3524
 __vma_adjust+0x9ab/0x1900 mm/mmap.c:886
 vma_merge+0x590/0x870 mm/mmap.c:1119
 userfaultfd_release+0x4c5/0x670 fs/userfaultfd.c:888
 __fput+0x277/0x9d0 fs/file_table.c:317
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 ptrace_notify+0x114/0x140 kernel/signal.c:2353
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work kernel/entry/common.c:249 [inline]
 syscall_exit_to_user_mode_prepare+0xdb/0x230 kernel/entry/common.c:276
 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
 syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

The buggy address belongs to the object at ffff88801fefe1b0
 which belongs to the cache vm_area_struct of size 152
The buggy address is located 88 bytes inside of
 152-byte region [ffff88801fefe1b0, ffff88801fefe248)

The buggy address belongs to the physical page:
page:ffffea00007fbf80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fefe
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00009ed380 dead000000000003 ffff888140006b40
raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 3327, tgid 3327 (rm), ts 28524505479, free_ts 28520297867
 prep_new_page mm/page_alloc.c:2460 [inline]
 get_page_from_freelist+0xa64/0x3d10 mm/page_alloc.c:4279
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5500
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2279
 alloc_slab_page mm/slub.c:1797 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1942
 new_slab mm/slub.c:2002 [inline]
 ___slab_alloc+0x985/0xd90 mm/slub.c:3002
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089
 slab_alloc_node mm/slub.c:3180 [inline]
 slab_alloc mm/slub.c:3222 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3229 [inline]
 kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3239
 vm_area_dup+0x81/0x380 kernel/fork.c:466
 __split_vma+0x9f/0x530 mm/mmap.c:2273
 do_mas_align_munmap+0x2c0/0xf00 mm/mmap.c:2399
 do_mas_munmap+0x202/0x2c0 mm/mmap.c:2556
 mmap_region+0x219/0x1bf0 mm/mmap.c:2604
 do_mmap+0x825/0xf60 mm/mmap.c:1480
 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:520
 ksys_mmap_pgoff+0x40d/0x5a0 mm/mmap.c:1526
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1375 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1425
 free_unref_page_prepare mm/page_alloc.c:3311 [inline]
 free_unref_page_list+0x184/0x1530 mm/page_alloc.c:3475
 release_pages+0xff1/0x2290 mm/swap.c:980
 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:58
 tlb_flush_mmu_free mm/mmu_gather.c:255 [inline]
 tlb_flush_mmu mm/mmu_gather.c:262 [inline]
 tlb_finish_mmu+0x147/0x7e0 mm/mmu_gather.c:353
 exit_mmap+0x217/0x750 mm/mmap.c:3205
 __mmput+0x128/0x4c0 kernel/fork.c:1180
 mmput+0x5c/0x70 kernel/fork.c:1201
 exec_mmap fs/exec.c:1038 [inline]
 begin_new_exec+0xfbd/0x2e50 fs/exec.c:1297
 load_elf_binary+0x15a3/0x4ec0 fs/binfmt_elf.c:1002
 search_binary_handler fs/exec.c:1728 [inline]
 exec_binprm fs/exec.c:1769 [inline]
 bprm_execve fs/exec.c:1838 [inline]
 bprm_execve+0x7ef/0x1970 fs/exec.c:1800
 do_execveat_common+0x724/0x890 fs/exec.c:1943
 do_execve fs/exec.c:2017 [inline]
 __do_sys_execve fs/exec.c:2093 [inline]
 __se_sys_execve fs/exec.c:2088 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:2088
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Memory state around the buggy address:
 ffff88801fefe100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
 ffff88801fefe180: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
>ffff88801fefe200: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
                      ^
 ffff88801fefe280: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801fefe300: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
==================================================================

Crashes (10):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2022/06/12 09:47	linux-next	6d0c80680317	0d5abf15	.config	strace log	report	syz	C			ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/08/07 11:24	linux-next	cb71b93c2dc3	88e3a122	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/08/06 07:09	linux-next	cb71b93c2dc3	e853abd9	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/10 20:22	linux-next	cb71b93c2dc3	b5765a15	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/09 10:24	linux-next	cb71b93c2dc3	b5765a15	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/08 02:53	linux-next	cb71b93c2dc3	bff65f44	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/03 04:07	linux-next	cb71b93c2dc3	1434eec0	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/06/30 07:23	linux-next	cb71b93c2dc3	1434eec0	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/06/26 09:47	linux-next	2f9cb3d3bd73	a371c43c	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/06/12 09:26	linux-next	6d0c80680317	0d5abf15	.config	console log	report			info		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust

* ~~Struck through~~ repros no longer work on HEAD.