[syzbot] KASAN: invalid-free in io_clean_op

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syzbot

unread,
Sep 25, 2022, 1:29:42 PMSep 25
to asml.s...@gmail.com, ax...@kernel.dk, io-u...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: aaa11ce2ffc8 Add linux-next specific files for 20220923
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1608cadf080000
kernel config: https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294
dashboard link: https://syzkaller.appspot.com/bug?extid=edfd15cd4246a3fc615a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144acdef080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10686540880000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+edfd15...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: double-free in slab_free mm/slub.c:3599 [inline]
BUG: KASAN: double-free in __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
Free of addr ffff88801e642000 by task syz-executor374/3609

CPU: 0 PID: 3609 Comm: syz-executor374 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:395
kasan_report_invalid_free+0x97/0x1b0 mm/kasan/report.c:460
____kasan_slab_free+0x185/0x1c0 mm/kasan/common.c:225
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1669 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
slab_free mm/slub.c:3599 [inline]
__kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
io_clean_op+0x581/0xb10 io_uring/io_uring.c:1699
io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1305
__io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1343
io_submit_flush_completions io_uring/io_uring.c:171 [inline]
ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1003
tctx_task_work+0x153/0x4a0 io_uring/io_uring.c:1087
task_work_run+0x16b/0x270 kernel/task_work.c:179
ptrace_notify+0x114/0x140 kernel/signal.c:2354
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:251 [inline]
syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:278
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:296
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f10ee5d8bb9
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff7120f998 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 00000000000040b2 RBX: 0000000000000003 RCX: 00007f10ee5d8bb9
RDX: 0000000000000000 RSI: 00000000000040b2 RDI: 0000000000000003
RBP: 00007f10ee59cd60 R08: 0000000020000000 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f10ee59cdf0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>

Allocated by task 3609:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:934 [inline]
__kmalloc+0x54/0xc0 mm/slab_common.c:947
kmalloc include/linux/slab.h:564 [inline]
io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1590
io_msg_alloc_async io_uring/net.c:138 [inline]
io_msg_alloc_async_prep io_uring/net.c:147 [inline]
io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221
io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1613
io_submit_sqe io_uring/io_uring.c:2137 [inline]
io_submit_sqes+0xfcd/0x1df0 io_uring/io_uring.c:2276
__do_sys_io_uring_enter+0xac6/0x2410 io_uring/io_uring.c:3216
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+0x63/0xcd

Freed by task 3609:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1669 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
slab_free mm/slub.c:3599 [inline]
__kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
io_send_zc_cleanup+0x133/0x180 io_uring/net.c:916
io_clean_op+0xf4/0xb10 io_uring/io_uring.c:1684
io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1305
__io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1343
io_submit_flush_completions io_uring/io_uring.c:171 [inline]
ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1003
tctx_task_work+0x153/0x4a0 io_uring/io_uring.c:1087
task_work_run+0x16b/0x270 kernel/task_work.c:179
ptrace_notify+0x114/0x140 kernel/signal.c:2354
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:251 [inline]
syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:278
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:296
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88801e642000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
512-byte region [ffff88801e642000, ffff88801e642200)

The buggy address belongs to the physical page:
page:ffffea0000799000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e640
head:ffffea0000799000 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888011841c80 dead000000100010 0000000000000000
raw: 0000000000000000 dead000000000001 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 7630490778, free_ts 0
prep_new_page mm/page_alloc.c:2538 [inline]
get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287
__alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2113
alloc_pages+0x22f/0x270 mm/mempolicy.c:2275
alloc_slab_page mm/slub.c:1739 [inline]
allocate_slab+0x213/0x300 mm/slub.c:1884
new_slab mm/slub.c:1937 [inline]
___slab_alloc+0xac1/0x1430 mm/slub.c:3119
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
slab_alloc_node mm/slub.c:3302 [inline]
__kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375
kmalloc_node_trace+0x1d/0x60 mm/slab_common.c:1027
kmalloc_node include/linux/slab.h:581 [inline]
kzalloc_node include/linux/slab.h:706 [inline]
iolatency_pd_alloc+0xc1/0x1c0 block/blk-iolatency.c:961
blkcg_activate_policy block/blk-cgroup.c:1425 [inline]
blkcg_activate_policy+0x1e4/0xba0 block/blk-cgroup.c:1398
blk_iolatency_init+0x290/0x5e0 block/blk-iolatency.c:777
blkcg_init_queue+0x17d/0x620 block/blk-cgroup.c:1302
__alloc_disk_node+0x29d/0x650 block/genhd.c:1366
__blk_alloc_disk+0x35/0x90 block/genhd.c:1405
brd_alloc.part.0+0x281/0x760 drivers/block/brd.c:391
page_owner free stack trace missing

Memory state around the buggy address:
ffff88801e641f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801e641f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801e642000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801e642080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801e642100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot can test patches for this issue, for details see:
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Pavel Begunkov

unread,
Sep 25, 2022, 1:55:53 PMSep 25
to syzbot, ax...@kernel.dk, io-u...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
On 9/25/22 18:29, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: aaa11ce2ffc8 Add linux-next specific files for 20220923
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1608cadf080000
> kernel config: https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294
> dashboard link: https://syzkaller.appspot.com/bug?extid=edfd15cd4246a3fc615a
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144acdef080000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10686540880000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+edfd15...@syzkaller.appspotmail.com

#syz test: git://git.kernel.dk/linux.git for-6.1/io_uring
--
Pavel Begunkov

syzbot

unread,
Sep 25, 2022, 2:15:24 PMSep 25
to asml.s...@gmail.com, ax...@kernel.dk, io-u...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: invalid-free in io_clean_op

==================================================================
BUG: KASAN: double-free in slab_free mm/slub.c:3534 [inline]
BUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4562

CPU: 0 PID: 4143 Comm: syz-executor.0 Not tainted 6.0.0-rc6-syzkaller-00046-gaa1df3a360a0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
kasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462
____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1754 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
slab_free mm/slub.c:3534 [inline]
kfree+0xe2/0x580 mm/slub.c:4562
io_clean_op+0x581/0xb10 io_uring/io_uring.c:1706
io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1312
__io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1350
io_submit_flush_completions io_uring/io_uring.c:171 [inline]
ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1010
tctx_task_work+0x153/0x420 io_uring/io_uring.c:1094
task_work_run+0xdd/0x1a0 kernel/task_work.c:177
get_signal+0x1c3/0x2610 kernel/signal.c:2634
arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f25f668a669
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f25f7743168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 00000000000040b2 RBX: 00007f25f67abf80 RCX: 00007f25f668a669
RDX: 0000000000000000 RSI: 00000000000040b2 RDI: 0000000000000003
RBP: 00007f25f66e5560 R08: 0000000020000000 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca833dfcf R14: 00007f25f7743300 R15: 0000000000022000
</TASK>

Allocated by task 4143:
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:437 [inline]
____kasan_kmalloc mm/kasan/common.c:516 [inline]
____kasan_kmalloc mm/kasan/common.c:475 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525
kmalloc include/linux/slab.h:605 [inline]
io_alloc_async_data+0x9b/0x160 io_uring/io_uring.c:1597
io_msg_alloc_async io_uring/net.c:138 [inline]
io_msg_alloc_async_prep io_uring/net.c:147 [inline]
io_sendmsg_prep_async+0x19b/0x3c0 io_uring/net.c:221
io_req_prep_async+0x1d9/0x300 io_uring/io_uring.c:1620
io_submit_sqe io_uring/io_uring.c:2144 [inline]
io_submit_sqes+0xf69/0x1d10 io_uring/io_uring.c:2283
__do_sys_io_uring_enter+0xac6/0x2380 io_uring/io_uring.c:3224
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+0x63/0xcd

Freed by task 4143:
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:367 [inline]
____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1754 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
slab_free mm/slub.c:3534 [inline]
kfree+0xe2/0x580 mm/slub.c:4562
io_send_zc_cleanup+0x141/0x190 io_uring/net.c:916
io_clean_op+0xf4/0xb10 io_uring/io_uring.c:1691
io_free_batch_list+0x46f/0x7e0 io_uring/io_uring.c:1312
__io_submit_flush_completions+0x22b/0x2e0 io_uring/io_uring.c:1350
io_submit_flush_completions io_uring/io_uring.c:171 [inline]
ctx_flush_and_put+0xdf/0x1b0 io_uring/io_uring.c:1010
tctx_task_work+0x153/0x420 io_uring/io_uring.c:1094
task_work_run+0xdd/0x1a0 kernel/task_work.c:177
get_signal+0x1c3/0x2610 kernel/signal.c:2634
arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888016865800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
512-byte region [ffff888016865800, ffff888016865a00)

The buggy address belongs to the physical page:
page:ffffea00005a1900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16864
head:ffffea00005a1900 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011841c80
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2968, tgid 2968 (udevd), ts 80588086489, free_ts 78568556659
prep_new_page mm/page_alloc.c:2532 [inline]
get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515
alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
alloc_slab_page mm/slub.c:1824 [inline]
allocate_slab+0x27e/0x3d0 mm/slub.c:1969
new_slab mm/slub.c:2029 [inline]
___slab_alloc+0x7f1/0xe10 mm/slub.c:3031
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
slab_alloc_node mm/slub.c:3209 [inline]
__kmalloc_node_track_caller+0x2f2/0x380 mm/slub.c:4955
kmalloc_reserve net/core/skbuff.c:362 [inline]
__alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434
alloc_skb include/linux/skbuff.h:1257 [inline]
alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:290
uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
kobject_uevent_net_broadcast lib/kobject_uevent.c:409 [inline]
kobject_uevent_env+0xc2e/0x1640 lib/kobject_uevent.c:593
kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208
uevent_store+0x20/0x50 drivers/base/core.c:2509
dev_attr_store+0x50/0x80 drivers/base/core.c:2211
sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:136
kernfs_fop_write_iter+0x3f8/0x610 fs/kernfs/file.c:354
call_write_iter include/linux/fs.h:2189 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9e9/0xdd0 fs/read_write.c:578
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1449 [inline]
free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
free_unref_page_prepare mm/page_alloc.c:3380 [inline]
free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc_node mm/slub.c:3243 [inline]
kmem_cache_alloc_node+0x2b1/0x3f0 mm/slub.c:3293
__alloc_skb+0x210/0x2f0 net/core/skbuff.c:422
alloc_skb include/linux/skbuff.h:1257 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline]
__vhci_create_device+0x83/0x7d0 drivers/bluetooth/hci_vhci.c:300
vhci_create_device drivers/bluetooth/hci_vhci.c:374 [inline]
vhci_open_timeout+0x38/0x50 drivers/bluetooth/hci_vhci.c:531
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
ffff888016865700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888016865780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888016865800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888016865880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888016865900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


Tested on:

commit: aa1df3a3 io_uring: fix CQE reordering
git tree: git://git.kernel.dk/linux.git for-6.1/io_uring
console output: https://syzkaller.appspot.com/x/log.txt?x=12e27688880000
kernel config: https://syzkaller.appspot.com/x/.config?x=3521db70c6a595c4
dashboard link: https://syzkaller.appspot.com/bug?extid=edfd15cd4246a3fc615a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.

Pavel Begunkov

unread,
Sep 26, 2022, 6:06:02 AMSep 26
to syzbot, ax...@kernel.dk, io-u...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
On 9/25/22 18:54, Pavel Begunkov wrote:
> On 9/25/22 18:29, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    aaa11ce2ffc8 Add linux-next specific files for 20220923
>> git tree:       linux-next
>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1608cadf080000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294
>> dashboard link: https://syzkaller.appspot.com/bug?extid=edfd15cd4246a3fc615a
>> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=144acdef080000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10686540880000
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+edfd15...@syzkaller.appspotmail.com
>
> #syz test: git://git.kernel.dk/linux.git for-6.1/io_uring

Should be similar to the previous net/op_clean problem but
now zc and because of that we set CLEANUP too early. Just
a guess, will take a look at the repro

--
Pavel Begunkov

Pavel Begunkov

unread,
Sep 26, 2022, 9:51:03 AMSep 26
to syzbot, ax...@kernel.dk, io-u...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
On 9/25/22 19:15, syzbot wrote:
> Hello,
>
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> KASAN: invalid-free in io_clean_op

#syz test: https://github.com/isilence/linux.git io_uring/net-free-iov-bug

--
Pavel Begunkov

syzbot

unread,
Sep 26, 2022, 10:40:20 AMSep 26
to asml.s...@gmail.com, ax...@kernel.dk, io-u...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+edfd15...@syzkaller.appspotmail.com

Tested on:

commit: f159b763 io_uring/net: fix cleanup double free free_io..
git tree: https://github.com/isilence/linux.git io_uring/net-free-iov-bug
console output: https://syzkaller.appspot.com/x/log.txt?x=15697b18880000
kernel config: https://syzkaller.appspot.com/x/.config?x=3521db70c6a595c4
dashboard link: https://syzkaller.appspot.com/bug?extid=edfd15cd4246a3fc615a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.
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