=============================
WARNING: suspicious RCU usage
6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0 Not tainted
-----------------------------
net/sched/sch_generic.c:1290 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u4:5/1031:
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2960

stack backtrace:
CPU: 0 UID: 0 PID: 1031 Comm: kworker/u4:5 Not tainted 6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bond0 bond_mii_monitor
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 lockdep_rcu_suspicious+0x226/0x340 kernel/locking/lockdep.c:6845
 dev_deactivate_queue+0x8f/0x160 net/sched/sch_generic.c:1290
 netdev_for_each_tx_queue include/linux/netdevice.h:2562 [inline]
 dev_deactivate_many+0xc8/0xb10 net/sched/sch_generic.c:1363
 dev_deactivate+0x184/0x280 net/sched/sch_generic.c:1403
 linkwatch_do_dev+0x10a/0x170 net/core/link_watch.c:180
 ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
 bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:873
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2740 [inline]
 bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2962
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

=============================
WARNING: suspicious RCU usage
6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0 Not tainted
-----------------------------
./include/linux/rtnetlink.h:156 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u4:5/1031:
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2960

stack backtrace:
CPU: 0 UID: 0 PID: 1031 Comm: kworker/u4:5 Not tainted 6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bond0 bond_mii_monitor
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 lockdep_rcu_suspicious+0x226/0x340 kernel/locking/lockdep.c:6845
 dev_ingress_queue include/linux/rtnetlink.h:156 [inline]
 dev_deactivate_many+0x18f/0xb10 net/sched/sch_generic.c:1365
 dev_deactivate+0x184/0x280 net/sched/sch_generic.c:1403
 linkwatch_do_dev+0x10a/0x170 net/core/link_watch.c:180
 ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
 bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:873
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2740 [inline]
 bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2962
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
BUG: sleeping function called from invalid context at net/core/dev.c:11403
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1031, name: kworker/u4:5
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
3 locks held by kworker/u4:5/1031:
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2960
CPU: 0 UID: 0 PID: 1031 Comm: kworker/u4:5 Not tainted 6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bond0 bond_mii_monitor
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 __might_resched+0x5d4/0x780 kernel/sched/core.c:8758
 synchronize_net+0x1b/0x50 net/core/dev.c:11403
 dev_deactivate_many+0x4a7/0xb10 net/sched/sch_generic.c:1377
 dev_deactivate+0x184/0x280 net/sched/sch_generic.c:1403
 linkwatch_do_dev+0x10a/0x170 net/core/link_watch.c:180
 ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
 bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:873
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2740 [inline]
 bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2962
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

=============================
WARNING: suspicious RCU usage
6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0 Tainted: G        W         
-----------------------------
kernel/rcu/tree_exp.h:949 Illegal synchronize_rcu_expedited() in RCU read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
3 locks held by kworker/u4:5/1031:
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff888041eb1948 ((wq_completion)bond0){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc90002527d00 ((work_completion)(&(&bond->mii_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: bond_mii_monitor+0x174/0x3170 drivers/net/bonding/bond_main.c:2960

stack backtrace:
CPU: 0 UID: 0 PID: 1031 Comm: kworker/u4:5 Tainted: G        W          6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bond0 bond_mii_monitor
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 lockdep_rcu_suspicious+0x226/0x340 kernel/locking/lockdep.c:6845
 synchronize_rcu_expedited+0x12e/0x830 kernel/rcu/tree_exp.h:946
 dev_deactivate_many+0x4a7/0xb10 net/sched/sch_generic.c:1377
 dev_deactivate+0x184/0x280 net/sched/sch_generic.c:1403
 linkwatch_do_dev+0x10a/0x170 net/core/link_watch.c:180
 ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
 bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:873
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2740 [inline]
 bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2962
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
------------[ cut here ]------------
Voluntary context switch within RCU read-side critical section!
WARNING: CPU: 0 PID: 1031 at kernel/rcu/tree_plugin.h:331 rcu_note_context_switch+0xcf4/0xff0 kernel/rcu/tree_plugin.h:331
Modules linked in:
CPU: 0 UID: 0 PID: 1031 Comm: kworker/u4:5 Tainted: G        W          6.13.0-rc3-syzkaller-00026-g59dbb9d81adf #0
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bond0 bond_mii_monitor
RIP: 0010:rcu_note_context_switch+0xcf4/0xff0 kernel/rcu/tree_plugin.h:331
Code: 00 ba 02 00 00 00 e8 7b 13 fe ff 4c 8b b4 24 80 00 00 00 eb 91 c6 05 74 bc 7d 0e 01 90 48 c7 c7 00 ed 0b 8c e8 0d 2b da ff 90 <0f> 0b 90 90 e9 3b f4 ff ff 90 0f 0b 90 45 84 ed 0f 84 00 f4 ff ff
RSP: 0018:ffffc90002527100 EFLAGS: 00010046
RAX: a2c392b28815d500 RBX: ffff888035bdccc4 RCX: ffff888035bdc880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002527250 R08: ffffffff81601a42 R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: ffff888035bdc880
R13: 0000000000000000 R14: 1ffff920004a4e38 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc838969fe0 CR3: 0000000011ee4000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __schedule+0x34b/0x4c30 kernel/sched/core.c:6661
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
 synchronize_rcu_expedited+0x70a/0x830 kernel/rcu/tree_exp.h:976
 dev_deactivate_many+0x4a7/0xb10 net/sched/sch_generic.c:1377
 dev_deactivate+0x184/0x280 net/sched/sch_generic.c:1403
 linkwatch_do_dev+0x10a/0x170 net/core/link_watch.c:180
 ethtool_op_get_link+0x15/0x60 net/ethtool/ioctl.c:62
 bond_check_dev_link+0x1f1/0x3f0 drivers/net/bonding/bond_main.c:873
 bond_miimon_inspect drivers/net/bonding/bond_main.c:2740 [inline]
 bond_mii_monitor+0x49a/0x3170 drivers/net/bonding/bond_main.c:2962
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>