Extracting prog: 2m35.38449391s
Minimizing prog: 9m19.75088041s
Simplifying prog options: 0s
Extracting C: 51.860909082s
Simplifying C: 23m13.998170604s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
listen(r0, 0x8)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)
accept4(r0, 0x0, 0x0, 0x0)

program crashed: KASAN: invalid-free in inet_sock_destruct
single: successfully extracted reproducer
found reproducer with 5 syscalls
minimizing guilty program
testing program (duration=57.500788024s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
listen(r0, 0x8)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)

program did not crash
testing program (duration=57.500788024s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
listen(r0, 0x8)
accept4(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=57.500788024s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)
accept4(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=57.500788024s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-listen-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
listen(r0, 0x8)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)
accept4(r0, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=57.500788024s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): connect$inet-listen-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
connect$inet(0xffffffffffffffff, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
listen(0xffffffffffffffff, 0x8)
setsockopt$inet_opts(0xffffffffffffffff, 0x0, 0x4, 0x0, 0x0)
accept4(0xffffffffffffffff, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=57.500788024s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, 0x0, 0x0)
listen(r0, 0x8)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)
accept4(r0, 0x0, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=57.500788024s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program crashed: KASAN: invalid-free in inet_sock_destruct
simplifying C reproducer
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program crashed: KASAN: invalid-free in inet_sock_destruct
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program crashed: KASAN: invalid-free in inet_sock_destruct
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program crashed: KASAN: invalid-free in inet_sock_destruct
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program crashed: KFENCE: invalid free in inet_sock_destruct
a never seen crash title: KFENCE: invalid free in inet_sock_destruct, ignore
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program crashed: KASAN: invalid-free in inet_sock_destruct
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:false Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program crashed: KASAN: invalid-free in inet_sock_destruct
testing compiled C program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:false Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
program did not crash
testing program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:false Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
listen(r0, 0x8)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)
accept4(r0, 0x0, 0x0, 0x0)

program crashed: KASAN: invalid-free in inet_sock_destruct
validation run: crashed=true
testing program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:false Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
listen(r0, 0x8)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)
accept4(r0, 0x0, 0x0, 0x0)

program crashed: KASAN: invalid-free in inet_sock_destruct
validation run: crashed=true
testing program (duration=57.500788024s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:false IEEE802154:true Sysctl:false Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-connect$inet-listen-setsockopt$inet_opts-accept4
detailed listing:
executing program 0:
r0 = socket$inet(0xa, 0x801, 0x84)
connect$inet(r0, &(0x7f0000000340)={0x2, 0x0, @remote={0xac, 0x14, 0xffffffffffffffff}}, 0x10)
listen(r0, 0x8)
setsockopt$inet_opts(r0, 0x0, 0x4, 0x0, 0x0)
accept4(r0, 0x0, 0x0, 0x0)

program crashed: KASAN: invalid-free in inet_sock_destruct
validation run: crashed=true
reproducing took 40m12.724131319s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: double-free in inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
Free of addr ffff888074fd9e80 by task ksoftirqd/1/23

CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report_invalid_free+0xea/0x110 mm/kasan/report.c:557
 check_slab_allocation+0xe1/0x130 include/linux/page-flags.h:-1
 kasan_slab_pre_free include/linux/kasan.h:198 [inline]
 slab_free_hook mm/slub.c:2484 [inline]
 slab_free mm/slub.c:6665 [inline]
 kfree+0x13f/0x6e0 mm/slub.c:6873
 inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
 __sk_destruct+0x85/0x880 net/core/sock.c:2350
 sock_put include/net/sock.h:1991 [inline]
 sctp_endpoint_destroy_rcu+0xa1/0xf0 net/sctp/endpointola.c:197
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x27d/0x880 kernel/softirq.c:626
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 5980:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5654 [inline]
 __kmalloc_noprof+0x41d/0x800 mm/slub.c:5666
 kmalloc_noprof include/linux/slab.h:961 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 ip_options_get+0x51/0x4c0 net/ipv4/ip_options.c:517
 do_ip_setsockopt+0x1d9b/0x2d00 net/ipv4/ip_sockglue.c:1087
 ip_setsockopt+0x66/0x110 net/ipv4/ip_sockglue.c:1417
 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2364
 __sys_setsockopt net/socket.c:2389 [inline]
 __do_sys_setsockopt net/socket.c:2395 [inline]
 __se_sys_setsockopt net/socket.c:2392 [inline]
 __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2392
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 23:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2539 [inline]
 slab_free mm/slub.c:6665 [inline]
 kfree+0x191/0x6e0 mm/slub.c:6873
 inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
 __sk_destruct+0x85/0x880 net/core/sock.c:2350
 sock_put include/net/sock.h:1991 [inline]
 sctp_endpoint_destroy_rcu+0xa1/0xf0 net/sctp/endpointola.c:197
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x27d/0x880 kernel/softirq.c:626
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888074fd9e80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff888074fd9e80, ffff888074fd9ea0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x74fd9
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88813fe26780 ffffea0001f72a80 dead000000000002
raw: 0000000000000000 0000000000400040 00000000f5000000 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 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5709, tgid 5709 (sshd-session), ts 60361337081, free_ts 60340218801
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3077 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3250
 new_slab mm/slub.c:3304 [inline]
 ___slab_alloc+0xf56/0x1990 mm/slub.c:4653
 __slab_alloc+0x65/0x100 mm/slub.c:4776
 __slab_alloc_node mm/slub.c:4852 [inline]
 slab_alloc_node mm/slub.c:5248 [inline]
 __kmalloc_cache_noprof+0x41e/0x700 mm/slub.c:5768
 kmalloc_noprof include/linux/slab.h:957 [inline]
 slab_free_hook mm/slub.c:2491 [inline]
 slab_free mm/slub.c:6665 [inline]
 kmem_cache_free+0x166/0x6a0 mm/slub.c:6776
 fput_close_sync+0x113/0x220 fs/file_table.c:573
 __do_sys_close fs/open.c:1586 [inline]
 __se_sys_close fs/open.c:1571 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1571
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 23 tgid 23 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
 __tlb_remove_table_free mm/mmu_gather.c:227 [inline]
 tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x27d/0x880 kernel/softirq.c:626
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888074fd9d80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888074fd9e00: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
>ffff888074fd9e80: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
                   ^
 ffff888074fd9f00: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888074fd9f80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
==================================================================

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: double-free in inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
Free of addr ffff888074fd9e80 by task ksoftirqd/1/23

CPU: 1 UID: 0 PID: 23 Comm: ksoftirqd/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report_invalid_free+0xea/0x110 mm/kasan/report.c:557
 check_slab_allocation+0xe1/0x130 include/linux/page-flags.h:-1
 kasan_slab_pre_free include/linux/kasan.h:198 [inline]
 slab_free_hook mm/slub.c:2484 [inline]
 slab_free mm/slub.c:6665 [inline]
 kfree+0x13f/0x6e0 mm/slub.c:6873
 inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
 __sk_destruct+0x85/0x880 net/core/sock.c:2350
 sock_put include/net/sock.h:1991 [inline]
 sctp_endpoint_destroy_rcu+0xa1/0xf0 net/sctp/endpointola.c:197
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x27d/0x880 kernel/softirq.c:626
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 5980:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5654 [inline]
 __kmalloc_noprof+0x41d/0x800 mm/slub.c:5666
 kmalloc_noprof include/linux/slab.h:961 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 ip_options_get+0x51/0x4c0 net/ipv4/ip_options.c:517
 do_ip_setsockopt+0x1d9b/0x2d00 net/ipv4/ip_sockglue.c:1087
 ip_setsockopt+0x66/0x110 net/ipv4/ip_sockglue.c:1417
 do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2364
 __sys_setsockopt net/socket.c:2389 [inline]
 __do_sys_setsockopt net/socket.c:2395 [inline]
 __se_sys_setsockopt net/socket.c:2392 [inline]
 __x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2392
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 23:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2539 [inline]
 slab_free mm/slub.c:6665 [inline]
 kfree+0x191/0x6e0 mm/slub.c:6873
 inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
 __sk_destruct+0x85/0x880 net/core/sock.c:2350
 sock_put include/net/sock.h:1991 [inline]
 sctp_endpoint_destroy_rcu+0xa1/0xf0 net/sctp/endpointola.c:197
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x27d/0x880 kernel/softirq.c:626
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888074fd9e80
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff888074fd9e80, ffff888074fd9ea0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x74fd9
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88813fe26780 ffffea0001f72a80 dead000000000002
raw: 0000000000000000 0000000000400040 00000000f5000000 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 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 5709, tgid 5709 (sshd-session), ts 60361337081, free_ts 60340218801
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3077 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3250
 new_slab mm/slub.c:3304 [inline]
 ___slab_alloc+0xf56/0x1990 mm/slub.c:4653
 __slab_alloc+0x65/0x100 mm/slub.c:4776
 __slab_alloc_node mm/slub.c:4852 [inline]
 slab_alloc_node mm/slub.c:5248 [inline]
 __kmalloc_cache_noprof+0x41e/0x700 mm/slub.c:5768
 kmalloc_noprof include/linux/slab.h:957 [inline]
 slab_free_hook mm/slub.c:2491 [inline]
 slab_free mm/slub.c:6665 [inline]
 kmem_cache_free+0x166/0x6a0 mm/slub.c:6776
 fput_close_sync+0x113/0x220 fs/file_table.c:573
 __do_sys_close fs/open.c:1586 [inline]
 __se_sys_close fs/open.c:1571 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1571
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 23 tgid 23 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
 __tlb_remove_table_free mm/mmu_gather.c:227 [inline]
 tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
 handle_softirqs+0x27d/0x880 kernel/softirq.c:626
 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff888074fd9d80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff888074fd9e00: 00 00 00 00 fc fc fc fc fa fb fb fb fc fc fc fc
>ffff888074fd9e80: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
                   ^
 ffff888074fd9f00: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
 ffff888074fd9f80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
==================================================================