=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.15.120-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.1/27062 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire:
ffff800014b75540 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:206 [inline]
ffff800014b75540 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492
and this task is already holding:
ffff0000d7448108 (&sch->q.lock){+.-.}-{2:2}, at: netem_change+0x22c/0x1a90 net/sched/sch_netem.c:972
which would create a new lock dependency:
(&sch->q.lock){+.-.}-{2:2} -> (fs_reclaim){+.+.}-{0:0}
but this new dependency connects a SOFTIRQ-irq-safe lock:
(&sch->q.lock){+.-.}-{2:2}
... which became SOFTIRQ-irq-safe at:
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0xb0/0x10c kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:363 [inline]
dequeue_skb net/sched/sch_generic.c:240 [inline]
qdisc_restart net/sched/sch_generic.c:397 [inline]
__qdisc_run+0x934/0x1fc0 net/sched/sch_generic.c:415
qdisc_run+0x40/0x200 include/net/pkt_sched.h:132
net_tx_action+0x698/0x884 net/core/dev.c:5065
__do_softirq+0x344/0xe20 kernel/softirq.c:558
run_ksoftirqd+0x68/0x258 kernel/softirq.c:920
smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164
kthread+0x37c/0x45c kernel/kthread.c:319
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
to a SOFTIRQ-irq-unsafe lock:
(fs_reclaim){+.+.}-{0:0}
... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__fs_reclaim_acquire mm/page_alloc.c:4547 [inline]
fs_reclaim_acquire+0xf0/0x1d0 mm/page_alloc.c:4561
might_alloc include/linux/sched/mm.h:206 [inline]
slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492
slab_alloc_node mm/slub.c:3134 [inline]
kmem_cache_alloc_node_trace+0xa0/0x4c4 mm/slub.c:3270
kmalloc_node include/linux/slab.h:609 [inline]
kzalloc_node include/linux/slab.h:732 [inline]
alloc_worker kernel/workqueue.c:1858 [inline]
init_rescuer+0xa4/0x264 kernel/workqueue.c:4276
workqueue_init+0x2b4/0x640 kernel/workqueue.c:6133
kernel_init_freeable+0x448/0x650 init/main.c:1603
kernel_init+0x24/0x294 init/main.c:1510
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
local_irq_disable();
lock(&sch->q.lock);
lock(fs_reclaim);
<Interrupt>
lock(&sch->q.lock);
*** DEADLOCK ***
2 locks held by syz-executor.1/27062:
#0: ffff8000169d6ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffff8000169d6ea8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac net/core/rtnetlink.c:5590
#1: ffff0000d7448108 (&sch->q.lock){+.-.}-{2:2}, at: netem_change+0x22c/0x1a90 net/sched/sch_netem.c:972
the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
-> (&sch->q.lock){+.-.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x124/0x1c4 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:368 [inline]
dev_reset_queue+0xb4/0x190 net/sched/sch_generic.c:1245
netdev_for_each_tx_queue include/linux/netdevice.h:2379 [inline]
dev_deactivate_many+0x718/0xbe4 net/sched/sch_generic.c:1313
dev_deactivate+0x13c/0x1fc net/sched/sch_generic.c:1336
linkwatch_do_dev+0x2a8/0x3c8 net/core/link_watch.c:165
__linkwatch_run_queue+0x424/0x730 net/core/link_watch.c:213
linkwatch_event+0x58/0x68 net/core/link_watch.c:252
process_one_work+0x790/0x11b8 kernel/workqueue.c:2307
worker_thread+0x910/0x1034 kernel/workqueue.c:2454
kthread+0x37c/0x45c kernel/kthread.c:319
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
IN-SOFTIRQ-W at:
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0xb0/0x10c kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:363 [inline]
dequeue_skb net/sched/sch_generic.c:240 [inline]
qdisc_restart net/sched/sch_generic.c:397 [inline]
__qdisc_run+0x934/0x1fc0 net/sched/sch_generic.c:415
qdisc_run+0x40/0x200 include/net/pkt_sched.h:132
net_tx_action+0x698/0x884 net/core/dev.c:5065
__do_softirq+0x344/0xe20 kernel/softirq.c:558
run_ksoftirqd+0x68/0x258 kernel/softirq.c:920
smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164
kthread+0x37c/0x45c kernel/kthread.c:319
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
INITIAL USE at:
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x124/0x1c4 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:368 [inline]
dev_reset_queue+0xb4/0x190 net/sched/sch_generic.c:1245
netdev_for_each_tx_queue include/linux/netdevice.h:2379 [inline]
dev_deactivate_many+0x718/0xbe4 net/sched/sch_generic.c:1313
dev_deactivate+0x13c/0x1fc net/sched/sch_generic.c:1336
linkwatch_do_dev+0x2a8/0x3c8 net/core/link_watch.c:165
__linkwatch_run_queue+0x424/0x730 net/core/link_watch.c:213
linkwatch_event+0x58/0x68 net/core/link_watch.c:252
process_one_work+0x790/0x11b8 kernel/workqueue.c:2307
worker_thread+0x910/0x1034 kernel/workqueue.c:2454
kthread+0x37c/0x45c kernel/kthread.c:319
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
}
... key at: [<ffff8000187ce2c0>] qdisc_alloc.__key+0x0/0x20
the dependencies between the lock to be acquired
and SOFTIRQ-irq-unsafe lock:
-> (fs_reclaim){+.+.}-{0:0} {
HARDIRQ-ON-W at:
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__fs_reclaim_acquire mm/page_alloc.c:4547 [inline]
fs_reclaim_acquire+0xf0/0x1d0 mm/page_alloc.c:4561
might_alloc include/linux/sched/mm.h:206 [inline]
slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492
slab_alloc_node mm/slub.c:3134 [inline]
kmem_cache_alloc_node_trace+0xa0/0x4c4 mm/slub.c:3270
kmalloc_node include/linux/slab.h:609 [inline]
kzalloc_node include/linux/slab.h:732 [inline]
alloc_worker kernel/workqueue.c:1858 [inline]
init_rescuer+0xa4/0x264 kernel/workqueue.c:4276
workqueue_init+0x2b4/0x640 kernel/workqueue.c:6133
kernel_init_freeable+0x448/0x650 init/main.c:1603
kernel_init+0x24/0x294 init/main.c:1510
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
SOFTIRQ-ON-W at:
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__fs_reclaim_acquire mm/page_alloc.c:4547 [inline]
fs_reclaim_acquire+0xf0/0x1d0 mm/page_alloc.c:4561
might_alloc include/linux/sched/mm.h:206 [inline]
slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492
slab_alloc_node mm/slub.c:3134 [inline]
kmem_cache_alloc_node_trace+0xa0/0x4c4 mm/slub.c:3270
kmalloc_node include/linux/slab.h:609 [inline]
kzalloc_node include/linux/slab.h:732 [inline]
alloc_worker kernel/workqueue.c:1858 [inline]
init_rescuer+0xa4/0x264 kernel/workqueue.c:4276
workqueue_init+0x2b4/0x640 kernel/workqueue.c:6133
kernel_init_freeable+0x448/0x650 init/main.c:1603
kernel_init+0x24/0x294 init/main.c:1510
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
INITIAL USE at:
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__fs_reclaim_acquire mm/page_alloc.c:4547 [inline]
fs_reclaim_acquire+0xf0/0x1d0 mm/page_alloc.c:4561
might_alloc include/linux/sched/mm.h:206 [inline]
slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492
slab_alloc_node mm/slub.c:3134 [inline]
kmem_cache_alloc_node_trace+0xa0/0x4c4 mm/slub.c:3270
kmalloc_node include/linux/slab.h:609 [inline]
kzalloc_node include/linux/slab.h:732 [inline]
alloc_worker kernel/workqueue.c:1858 [inline]
init_rescuer+0xa4/0x264 kernel/workqueue.c:4276
workqueue_init+0x2b4/0x640 kernel/workqueue.c:6133
kernel_init_freeable+0x448/0x650 init/main.c:1603
kernel_init+0x24/0x294 init/main.c:1510
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870
}
... key at: [<ffff800014b75540>] __fs_reclaim_map+0x0/0x200
... acquired at:
__fs_reclaim_acquire mm/page_alloc.c:4547 [inline]
fs_reclaim_acquire+0xf0/0x1d0 mm/page_alloc.c:4561
might_alloc include/linux/sched/mm.h:206 [inline]
slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492
slab_alloc_node mm/slub.c:3134 [inline]
__kmalloc_node+0xbc/0x5b8 mm/slub.c:4451
kmalloc_node include/linux/slab.h:614 [inline]
kvmalloc_node+0x88/0x204 mm/util.c:619
kvmalloc include/linux/mm.h:805 [inline]
get_dist_table+0x9c/0x2a4 net/sched/sch_netem.c:788
netem_change+0x7cc/0x1a90 net/sched/sch_netem.c:988
netem_init+0x54/0xb8 net/sched/sch_netem.c:1075
qdisc_create+0x6fc/0xf44 net/sched/sch_api.c:1264
tc_modify_qdisc+0x8dc/0x1344
rtnetlink_rcv_msg+0xa74/0xdac net/core/rtnetlink.c:5593
netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2504
rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5611
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1923
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
____sys_sendmsg+0x584/0x870 net/socket.c:2412
___sys_sendmsg+0x214/0x294 net/socket.c:2466
__sys_sendmsg net/socket.c:2495 [inline]
__do_sys_sendmsg net/socket.c:2504 [inline]
__se_sys_sendmsg net/socket.c:2502 [inline]
__arm64_sys_sendmsg+0x1ac/0x25c net/socket.c:2502
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
stack backtrace:
CPU: 0 PID: 27062 Comm: syz-executor.1 Not tainted 5.15.120-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
dump_stack+0x1c/0x58 lib/dump_stack.c:113
__lock_acquire+0x62b4/0x7620 kernel/locking/lockdep.c:5011
lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
__fs_reclaim_acquire mm/page_alloc.c:4547 [inline]
fs_reclaim_acquire+0xf0/0x1d0 mm/page_alloc.c:4561
might_alloc include/linux/sched/mm.h:206 [inline]
slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492
slab_alloc_node mm/slub.c:3134 [inline]
__kmalloc_node+0xbc/0x5b8 mm/slub.c:4451
kmalloc_node include/linux/slab.h:614 [inline]
kvmalloc_node+0x88/0x204 mm/util.c:619
kvmalloc include/linux/mm.h:805 [inline]
get_dist_table+0x9c/0x2a4 net/sched/sch_netem.c:788
netem_change+0x7cc/0x1a90 net/sched/sch_netem.c:988
netem_init+0x54/0xb8 net/sched/sch_netem.c:1075
qdisc_create+0x6fc/0xf44 net/sched/sch_api.c:1264
tc_modify_qdisc+0x8dc/0x1344
rtnetlink_rcv_msg+0xa74/0xdac net/core/rtnetlink.c:5593
netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2504
rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5611
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1923
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
____sys_sendmsg+0x584/0x870 net/socket.c:2412
___sys_sendmsg+0x214/0x294 net/socket.c:2466
__sys_sendmsg net/socket.c:2495 [inline]
__do_sys_sendmsg net/socket.c:2504 [inline]
__se_sys_sendmsg net/socket.c:2502 [inline]
__arm64_sys_sendmsg+0x1ac/0x25c net/socket.c:2502
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 27062, name: syz-executor.1
INFO: lockdep is turned off.
Preemption disabled at:
[<ffff8000100468b0>] netem_change+0x22c/0x1a90 net/sched/sch_netem.c:972
CPU: 0 PID: 27062 Comm: syz-executor.1 Not tainted 5.15.120-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Call trace:
dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
dump_stack+0x1c/0x58 lib/dump_stack.c:113
___might_sleep+0x380/0x4dc kernel/sched/core.c:9625
__might_sleep+0x98/0xf0 kernel/sched/core.c:9579
might_alloc include/linux/sched/mm.h:209 [inline]
slab_pre_alloc_hook+0x58/0xe8 mm/slab.h:492
slab_alloc_node mm/slub.c:3134 [inline]
__kmalloc_node+0xbc/0x5b8 mm/slub.c:4451
kmalloc_node include/linux/slab.h:614 [inline]
kvmalloc_node+0x88/0x204 mm/util.c:619
kvmalloc include/linux/mm.h:805 [inline]
get_dist_table+0x9c/0x2a4 net/sched/sch_netem.c:788
netem_change+0x7cc/0x1a90 net/sched/sch_netem.c:988
netem_init+0x54/0xb8 net/sched/sch_netem.c:1075
qdisc_create+0x6fc/0xf44 net/sched/sch_api.c:1264
tc_modify_qdisc+0x8dc/0x1344
rtnetlink_rcv_msg+0xa74/0xdac net/core/rtnetlink.c:5593
netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2504
rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5611
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x664/0x938 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1923
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg net/socket.c:724 [inline]
____sys_sendmsg+0x584/0x870 net/socket.c:2412
___sys_sendmsg+0x214/0x294 net/socket.c:2466
__sys_sendmsg net/socket.c:2495 [inline]
__do_sys_sendmsg net/socket.c:2504 [inline]
__se_sys_sendmsg net/socket.c:2502 [inline]
__arm64_sys_sendmsg+0x1ac/0x25c net/socket.c:2502
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584