Hello,
syzbot found the following issue on:
HEAD commit: 4af60700a60c Linux 5.15.119
git tree: linux-5.15.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=17375280a80000
kernel config:
https://syzkaller.appspot.com/x/.config?x=f95d07036b0504a8
dashboard link:
https://syzkaller.appspot.com/bug?extid=e0e18fa7a2b40aa3562e
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/1a4abe225b30/disk-4af60700.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/c57a50e7d39b/vmlinux-4af60700.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/c21012530aba/Image-4af60700.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+e0e18f...@syzkaller.appspotmail.com
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.15.119-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.5/8700 [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:
ffff0000d8eaf108 (&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]
dev_requeue_skb+0x6d0/0x758 net/sched/sch_generic.c:148
sch_direct_xmit+0x278/0x484 net/sched/sch_generic.c:362
__dev_xmit_skb net/core/dev.c:3821 [inline]
__dev_queue_xmit+0x14b4/0x2a6c net/core/dev.c:4190
dev_queue_xmit+0x24/0x34 net/core/dev.c:4258
neigh_hh_output include/net/neighbour.h:493 [inline]
neigh_output include/net/neighbour.h:507 [inline]
ip_finish_output2+0xd50/0x1330 net/ipv4/ip_output.c:228
__ip_finish_output+0x1b0/0x458
ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
NF_HOOK_COND include/linux/netfilter.h:291 [inline]
ip_output+0x330/0x49c net/ipv4/ip_output.c:430
dst_output include/net/dst.h:443 [inline]
ip_local_out net/ipv4/ip_output.c:126 [inline]
__ip_queue_xmit+0xe70/0x1930 net/ipv4/ip_output.c:532
ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:546
__tcp_transmit_skb+0x1954/0x3218 net/ipv4/tcp_output.c:1403
__tcp_send_ack+0x25c/0x544 net/ipv4/tcp_output.c:3989
tcp_send_ack+0x4c/0x64 net/ipv4/tcp_output.c:3995
__tcp_ack_snd_check+0x3b4/0x8ec net/ipv4/tcp_input.c:5496
tcp_rcv_established+0x1214/0x1f40 net/ipv4/tcp_input.c:5931
tcp_v4_do_rcv+0x340/0xc70 net/ipv4/tcp_ipv4.c:1727
tcp_v4_rcv+0x1fd8/0x2770 net/ipv4/tcp_ipv4.c:2129
ip_protocol_deliver_rcu+0x36c/0x770 net/ipv4/ip_input.c:204
ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231
NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:302
ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:453 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:577 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline]
ip_sublist_rcv+0x8cc/0xbec net/ipv4/ip_input.c:635
ip_list_rcv+0x3e8/0x43c net/ipv4/ip_input.c:670
__netif_receive_skb_list_ptype net/core/dev.c:5505 [inline]
__netif_receive_skb_list_core+0x5cc/0x754 net/core/dev.c:5553
__netif_receive_skb_list net/core/dev.c:5605 [inline]
netif_receive_skb_list_internal+0x810/0xb2c net/core/dev.c:5696
gro_normal_list net/core/dev.c:5850 [inline]
napi_complete_done+0x258/0x61c net/core/dev.c:6588
napi_complete include/linux/netdevice.h:501 [inline]
gve_napi_poll+0x118/0x27c drivers/net/ethernet/google/gve/gve_main.c:210
__napi_poll+0xb4/0x624 net/core/dev.c:7012
napi_poll net/core/dev.c:7079 [inline]
net_rx_action+0x500/0xc10 net/core/dev.c:7166
__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.5/8700:
#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: ffff0000d8eaf108 (&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]
dev_requeue_skb+0x6d0/0x758 net/sched/sch_generic.c:148
sch_direct_xmit+0x278/0x484 net/sched/sch_generic.c:362
__dev_xmit_skb net/core/dev.c:3821 [inline]
__dev_queue_xmit+0x14b4/0x2a6c net/core/dev.c:4190
dev_queue_xmit+0x24/0x34 net/core/dev.c:4258
neigh_hh_output include/net/neighbour.h:493 [inline]
neigh_output include/net/neighbour.h:507 [inline]
ip_finish_output2+0xd50/0x1330 net/ipv4/ip_output.c:228
__ip_finish_output+0x1b0/0x458
ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
NF_HOOK_COND include/linux/netfilter.h:291 [inline]
ip_output+0x330/0x49c net/ipv4/ip_output.c:430
dst_output include/net/dst.h:443 [inline]
ip_local_out net/ipv4/ip_output.c:126 [inline]
__ip_queue_xmit+0xe70/0x1930 net/ipv4/ip_output.c:532
ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:546
__tcp_transmit_skb+0x1954/0x3218 net/ipv4/tcp_output.c:1403
__tcp_send_ack+0x25c/0x544 net/ipv4/tcp_output.c:3989
tcp_send_ack+0x4c/0x64 net/ipv4/tcp_output.c:3995
__tcp_ack_snd_check+0x3b4/0x8ec net/ipv4/tcp_input.c:5496
tcp_rcv_established+0x1214/0x1f40 net/ipv4/tcp_input.c:5931
tcp_v4_do_rcv+0x340/0xc70 net/ipv4/tcp_ipv4.c:1727
tcp_v4_rcv+0x1fd8/0x2770 net/ipv4/tcp_ipv4.c:2129
ip_protocol_deliver_rcu+0x36c/0x770 net/ipv4/ip_input.c:204
ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231
NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:302
ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:453 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:577 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline]
ip_sublist_rcv+0x8cc/0xbec net/ipv4/ip_input.c:635
ip_list_rcv+0x3e8/0x43c net/ipv4/ip_input.c:670
__netif_receive_skb_list_ptype net/core/dev.c:5505 [inline]
__netif_receive_skb_list_core+0x5cc/0x754 net/core/dev.c:5553
__netif_receive_skb_list net/core/dev.c:5605 [inline]
netif_receive_skb_list_internal+0x810/0xb2c net/core/dev.c:5696
gro_normal_list net/core/dev.c:5850 [inline]
napi_complete_done+0x258/0x61c net/core/dev.c:6588
napi_complete include/linux/netdevice.h:501 [inline]
gve_napi_poll+0x118/0x27c drivers/net/ethernet/google/gve/gve_main.c:210
__napi_poll+0xb4/0x624 net/core/dev.c:7012
napi_poll net/core/dev.c:7079 [inline]
net_rx_action+0x500/0xc10 net/core/dev.c:7166
__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+0x820/0x1a90 net/sched/sch_netem.c:995
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: 1 PID: 8700 Comm: syz-executor.5 Not tainted 5.15.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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+0x820/0x1a90 net/sched/sch_netem.c:995
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: 8700, name: syz-executor.5
INFO: lockdep is turned off.
Preemption disabled at:
[<ffff800010049c20>] netem_change+0x22c/0x1a90 net/sched/sch_netem.c:972
CPU: 1 PID: 8700 Comm: syz-executor.5 Not tainted 5.15.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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+0x820/0x1a90 net/sched/sch_netem.c:995
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
---
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