[syzbot] [net?] KASAN: invalid-free in inet_sock_destruct
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8:22 AM (3 hours ago) 8:22 AM
to da...@davemloft.net, dsa...@kernel.org, edum...@google.com, ho...@kernel.org, ku...@kernel.org, linux-...@vger.kernel.org, net...@vger.kernel.org, pab...@redhat.com, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: a0c3aefb08cd Merge branch '40GbE' of git://git.kernel.org/..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=104c5a58580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3c2e630e5d8a0109
dashboard link: https://syzkaller.appspot.com/bug?extid=ec33a1a006ed5abe7309
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153eb412580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12fc317c580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0cc70b728a24/disk-a0c3aefb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/566c56cd7834/vmlinux-a0c3aefb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a0c05f9d1386/bzImage-a0c3aefb.xz
Bisection is inconclusive: the first bad commit could be any of:
151b98d10ef7 net: Add sk_clone().
16942cf4d3e3 sctp: Use sk_clone() in sctp_accept().
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=134067cd980000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ec33a1...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: double-free in inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
Free of addr ffff88801f3430c0 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 10/02/2025
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:6630 [inline]
kfree+0x148/0x6d0 mm/slub.c:6837
inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
__sk_destruct+0x89/0x660 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+0x286/0x870 kernel/softirq.c:622
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1063
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 6015:
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:400 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5642 [inline]
__kmalloc_noprof+0x411/0x7f0 mm/slub.c:5654
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:2360
__sys_setsockopt net/socket.c:2385 [inline]
__do_sys_setsockopt net/socket.c:2391 [inline]
__se_sys_setsockopt net/socket.c:2388 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2388
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:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
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:6630 [inline]
kfree+0x19a/0x6d0 mm/slub.c:6837
inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
__sk_destruct+0x89/0x660 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+0x286/0x870 kernel/softirq.c:622
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1063
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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 ffff88801f3430c0
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff88801f3430c0, ffff88801f3430e0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f343
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801a026780 0000000000000000 dead000000000001
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 184, tgid 184 (kworker/u8:6), ts 6625749703, free_ts 6600992626
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3055 [inline]
allocate_slab+0x96/0x350 mm/slub.c:3228
new_slab mm/slub.c:3282 [inline]
___slab_alloc+0xe94/0x18a0 mm/slub.c:4651
__slab_alloc+0x65/0x100 mm/slub.c:4770
__slab_alloc_node mm/slub.c:4846 [inline]
slab_alloc_node mm/slub.c:5268 [inline]
__kmalloc_cache_noprof+0x411/0x6f0 mm/slub.c:5758
kmalloc_noprof include/linux/slab.h:957 [inline]
slab_free_hook mm/slub.c:2491 [inline]
slab_free mm/slub.c:6630 [inline]
kmem_cache_free+0x16f/0x690 mm/slub.c:6740
__fput_deferred+0x227/0x390 fs/file_table.c:523
fput_close+0x119/0x200 fs/file_table.c:585
path_openat+0x313c/0x3830 fs/namei.c:4143
do_filp_open+0x1fa/0x410 fs/namei.c:4161
do_open_execat+0x135/0x560 fs/exec.c:783
alloc_bprm+0x28/0x5c0 fs/exec.c:1410
kernel_execve+0x9b/0x9f0 fs/exec.c:1885
page last free pid 10 tgid 10 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
vfree+0x25a/0x400 mm/vmalloc.c:3440
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3359
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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:
ffff88801f342f80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff88801f343000: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
>ffff88801f343080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88801f343100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
ffff88801f343180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: a0c3aefb08cd Merge branch '40GbE' of git://git.kernel.org/..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=104c5a58580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3c2e630e5d8a0109
dashboard link: https://syzkaller.appspot.com/bug?extid=ec33a1a006ed5abe7309
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153eb412580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12fc317c580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0cc70b728a24/disk-a0c3aefb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/566c56cd7834/vmlinux-a0c3aefb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a0c05f9d1386/bzImage-a0c3aefb.xz
Bisection is inconclusive: the first bad commit could be any of:
151b98d10ef7 net: Add sk_clone().
16942cf4d3e3 sctp: Use sk_clone() in sctp_accept().
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=134067cd980000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ec33a1...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: double-free in inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
Free of addr ffff88801f3430c0 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 10/02/2025
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:6630 [inline]
kfree+0x148/0x6d0 mm/slub.c:6837
inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
__sk_destruct+0x89/0x660 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+0x286/0x870 kernel/softirq.c:622
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1063
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 6015:
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:400 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
kasan_kmalloc include/linux/kasan.h:262 [inline]
__do_kmalloc_node mm/slub.c:5642 [inline]
__kmalloc_noprof+0x411/0x7f0 mm/slub.c:5654
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:2360
__sys_setsockopt net/socket.c:2385 [inline]
__do_sys_setsockopt net/socket.c:2391 [inline]
__se_sys_setsockopt net/socket.c:2388 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2388
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:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
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:6630 [inline]
kfree+0x19a/0x6d0 mm/slub.c:6837
inet_sock_destruct+0x538/0x740 net/ipv4/af_inet.c:159
__sk_destruct+0x89/0x660 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+0x286/0x870 kernel/softirq.c:622
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1063
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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 ffff88801f3430c0
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff88801f3430c0, ffff88801f3430e0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f343
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801a026780 0000000000000000 dead000000000001
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 184, tgid 184 (kworker/u8:6), ts 6625749703, free_ts 6600992626
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3055 [inline]
allocate_slab+0x96/0x350 mm/slub.c:3228
new_slab mm/slub.c:3282 [inline]
___slab_alloc+0xe94/0x18a0 mm/slub.c:4651
__slab_alloc+0x65/0x100 mm/slub.c:4770
__slab_alloc_node mm/slub.c:4846 [inline]
slab_alloc_node mm/slub.c:5268 [inline]
__kmalloc_cache_noprof+0x411/0x6f0 mm/slub.c:5758
kmalloc_noprof include/linux/slab.h:957 [inline]
slab_free_hook mm/slub.c:2491 [inline]
slab_free mm/slub.c:6630 [inline]
kmem_cache_free+0x16f/0x690 mm/slub.c:6740
__fput_deferred+0x227/0x390 fs/file_table.c:523
fput_close+0x119/0x200 fs/file_table.c:585
path_openat+0x313c/0x3830 fs/namei.c:4143
do_filp_open+0x1fa/0x410 fs/namei.c:4161
do_open_execat+0x135/0x560 fs/exec.c:783
alloc_bprm+0x28/0x5c0 fs/exec.c:1410
kernel_execve+0x9b/0x9f0 fs/exec.c:1885
page last free pid 10 tgid 10 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
vfree+0x25a/0x400 mm/vmalloc.c:3440
delayed_vfree_work+0x55/0x80 mm/vmalloc.c:3359
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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:
ffff88801f342f80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
ffff88801f343000: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
>ffff88801f343080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
^
ffff88801f343100: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
ffff88801f343180: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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