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* [moderation/CI] Re: netfilter: flowtable: purge entries immediately when destroying the flowtable
@ 2026-10-30 15:25 syzbot ci
  2026-10-30 17:31 ` Aleksandr Nogikh
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2026-10-30 15:25 UTC (permalink / raw)
  To: syzkaller-upstream-moderation; +Cc: syzbot

syzbot ci has tested the following series

[v1] netfilter: flowtable: purge entries immediately when destroying the flowtable
https://lore.kernel.org/all/20261029171950.222776-1-pablo@netfilter.org
* [PATCH nf] netfilter: flowtable: purge entries immediately when destroying the flowtable

and found the following issues:
* BUG: sleeping function called from invalid context in flow_offload_work_del
* WARNING: locking bug in flow_offload_work_del

Full report is available here:
https://ci.syzbot.org/series/5482d6d8-0683-4f36-bb55-ffcf94a9edcc

***

BUG: sleeping function called from invalid context in flow_offload_work_del

tree:      nf
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/netfilter/nf.git
base:      734bef548a96e8774d6eef5dfa2026c6edc4e80b
arch:      amd64
compiler:  Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
config:    https://ci.syzbot.org/builds/94e4012e-ffd8-430a-9ba4-d5a167bf8988/config
syz repro: https://ci.syzbot.org/findings/6c0e698b-3bb6-4d1f-94cb-9ebf1c0a71db/syz_repro

BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1573
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 5686, name: kworker/u8:3
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
locks held by kworker/u8:3/5686: 3, last CPU#0:
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rhashtable_walk_start_check+0x64/0xcf0 lib/rhashtable.c:872
CPU: 0 UID: 0 PID: 5686 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 __might_resched+0x36a/0x4c0 kernel/sched/core.c:9195
 down_read+0x26/0x320 kernel/locking/rwsem.c:1573
 nf_flow_offload_tuple net/netfilter/nf_flow_table_offload.c:920 [inline]
 flow_offload_tuple_del net/netfilter/nf_flow_table_offload.c:951 [inline]
 flow_offload_work_del+0x240/0x5e0 net/netfilter/nf_flow_table_offload.c:995
 nf_flow_table_offload_purge+0x51/0x80 net/netfilter/nf_flow_table_offload.c:1184
 nf_flow_table_do_purge net/netfilter/nf_flow_table_core.c:776 [inline]
 nf_flow_table_iterate net/netfilter/nf_flow_table_core.c:459 [inline]
 nf_flow_table_free+0x29b/0x3b0 net/netfilter/nf_flow_table_core.c:789
 tcf_ct_flow_table_cleanup_work+0x1a/0x90 net/sched/act_ct.c:386
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

=============================
[ BUG: Invalid wait context ]
syzkaller #0 Tainted: G        W           
-----------------------------
kworker/u8:3/5686 is trying to lock:
ffff88817589eb28 (&flowtable->flow_block_lock){.+.+}-{4:4}, at: nf_flow_offload_tuple net/netfilter/nf_flow_table_offload.c:920 [inline]
ffff88817589eb28 (&flowtable->flow_block_lock){.+.+}-{4:4}, at: flow_offload_tuple_del net/netfilter/nf_flow_table_offload.c:951 [inline]
ffff88817589eb28 (&flowtable->flow_block_lock){.+.+}-{4:4}, at: flow_offload_work_del+0x240/0x5e0 net/netfilter/nf_flow_table_offload.c:995
other info that might help us debug this:
context-{5:5}
locks held by kworker/u8:3/5686: 3, last CPU#0:
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #0: ffff8881108f3948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #1: ffffc90004e67c40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rhashtable_walk_start_check+0x64/0xcf0 lib/rhashtable.c:872
stack backtrace:
CPU: 0 UID: 0 PID: 5686 Comm: kworker/u8:3 Tainted: G        W            syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4874 [inline]
 check_wait_context kernel/locking/lockdep.c:4946 [inline]
 __lock_acquire+0xf5b/0x2de0 kernel/locking/lockdep.c:5238
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 down_read+0x45/0x320 kernel/locking/rwsem.c:1574
 nf_flow_offload_tuple net/netfilter/nf_flow_table_offload.c:920 [inline]
 flow_offload_tuple_del net/netfilter/nf_flow_table_offload.c:951 [inline]
 flow_offload_work_del+0x240/0x5e0 net/netfilter/nf_flow_table_offload.c:995
 nf_flow_table_offload_purge+0x51/0x80 net/netfilter/nf_flow_table_offload.c:1184
 nf_flow_table_do_purge net/netfilter/nf_flow_table_core.c:776 [inline]
 nf_flow_table_iterate net/netfilter/nf_flow_table_core.c:459 [inline]
 nf_flow_table_free+0x29b/0x3b0 net/netfilter/nf_flow_table_core.c:789
 tcf_ct_flow_table_cleanup_work+0x1a/0x90 net/sched/act_ct.c:386
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


***

WARNING: locking bug in flow_offload_work_del

tree:      nf
URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/netfilter/nf.git
base:      734bef548a96e8774d6eef5dfa2026c6edc4e80b
arch:      amd64
compiler:  Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8
config:    https://ci.syzbot.org/builds/94e4012e-ffd8-430a-9ba4-d5a167bf8988/config
AI triage: https://ci.syzbot.org/findings/8d3389f2-6e3f-4f98-bc3b-bba34041a26f/triage_trajectory

BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1573
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 5634, name: kworker/u8:2
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
locks held by kworker/u8:2/5634: 3, last CPU#1:
 #0: ffff888115805948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000473fc40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rhashtable_walk_start_check+0x64/0xcf0
CPU: 1 UID: 0 PID: 5634 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 __might_resched+0x36a/0x4c0
 down_read+0x26/0x320
 flow_offload_work_del+0x240/0x5e0
 nf_flow_table_offload_purge+0x51/0x80
 nf_flow_table_free+0x29b/0x3b0
 tcf_ct_flow_table_cleanup_work+0x1a/0x90
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
=============================
[ BUG: Invalid wait context ]
syzkaller #0 Tainted: G        W           
-----------------------------
kworker/u8:2/5634 is trying to lock:
ffff8881b9d94b28 (&flowtable->flow_block_lock){++++}-{4:4}, at: flow_offload_work_del+0x240/0x5e0
other info that might help us debug this:
context-{5:5}
locks held by kworker/u8:2/5634: 3, last CPU#0:
 #0: ffff888115805948 ((wq_completion)act_ct_workqueue){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc9000473fc40 ((work_completion)(&(&ct_ft->rwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rhashtable_walk_start_check+0x64/0xcf0
stack backtrace:
CPU: 0 UID: 0 PID: 5634 Comm: kworker/u8:2 Tainted: G        W            syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: act_ct_workqueue tcf_ct_flow_table_cleanup_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 __lock_acquire+0xf5b/0x2de0
 lock_acquire+0x115/0x350
 down_read+0x45/0x320
 flow_offload_work_del+0x240/0x5e0
 nf_flow_table_offload_purge+0x51/0x80
 nf_flow_table_free+0x29b/0x3b0
 tcf_ct_flow_table_cleanup_work+0x1a/0x90
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
  Tested-by: syzbot@syzkaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.

To test a fix for this bug, please reply with `#syz test`
(on a separate line) and attach the patch to the email.

Notes:
- The patch will be applied on top of the tested series (as an
  incremental fix).
- To test a new version of the whole series, please send it directly
  to syzbot@lists.linux.dev.
- Arguments like custom git repos and branches are not supported.

The email will later be sent to:
[netfilter-devel@vger.kernel.org pablo@netfilter.org]

If the report looks fine to you, reply with:
#syz upstream

If the report is a false positive, reply with
#syz invalid


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2026-10-30 15:25 [moderation/CI] Re: netfilter: flowtable: purge entries immediately when destroying the flowtable syzbot ci
2026-10-30 17:31 ` Aleksandr Nogikh

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