netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. ===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 6.1.38-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.2/10294 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: ffff80001586bd40 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:271 [inline] ffff80001586bd40 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:710 [inline] ffff80001586bd40 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3318 [inline] ffff80001586bd40 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_node+0x58/0x388 mm/slub.c:3437 and this task is already holding: ffff0000cdfef108 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 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: (&peer->endpoint_lock){++-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x54/0x6c kernel/locking/spinlock.c:334 wg_socket_clear_peer_endpoint_src+0x24/0x54 drivers/net/wireguard/socket.c:310 wg_expired_retransmit_handshake+0xc4/0x27c drivers/net/wireguard/timers.c:73 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers+0x554/0x718 kernel/time/timer.c:1790 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1803 __do_softirq+0x30c/0xea0 kernel/softirq.c:571 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:84 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:650 irq_exit_rcu+0x14/0x84 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:577 __sanitizer_cov_trace_switch+0x1c/0xec kernel/kcov.c:323 vsnprintf+0x128/0x1998 lib/vsprintf.c:2752 add_uevent_var+0x190/0x3c0 lib/kobject_uevent.c:665 dev_uevent+0x164/0x790 drivers/base/core.c:2550 uevent_show+0x1a4/0x320 drivers/base/core.c:2639 dev_attr_show+0x60/0xcc drivers/base/core.c:2342 sysfs_kf_seq_show+0x2d0/0x43c fs/sysfs/file.c:59 kernfs_seq_show+0x150/0x1fc fs/kernfs/file.c:201 seq_read_iter+0x3e0/0xc44 fs/seq_file.c:230 kernfs_fop_read_iter+0x144/0x5c8 fs/kernfs/file.c:275 call_read_iter include/linux/fs.h:2199 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x5bc/0x8ac fs/read_write.c:470 ksys_read+0x15c/0x26c fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 to a SOFTIRQ-irq-unsafe lock: (fs_reclaim){+.+.}-{0:0} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __fs_reclaim_acquire mm/page_alloc.c:4683 [inline] fs_reclaim_acquire+0x90/0x12c mm/page_alloc.c:4697 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3318 [inline] __kmem_cache_alloc_node+0x58/0x388 mm/slub.c:3437 kmalloc_node_trace+0x44/0x90 mm/slab_common.c:1058 kmalloc_node include/linux/slab.h:575 [inline] kzalloc_node include/linux/slab.h:700 [inline] alloc_worker kernel/workqueue.c:1840 [inline] init_rescuer+0xa4/0x264 kernel/workqueue.c:4269 workqueue_init+0x298/0x5b4 kernel/workqueue.c:6098 kernel_init_freeable+0x33c/0x528 init/main.c:1614 kernel_init+0x24/0x29c init/main.c:1519 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 other info that might help us debug this: Chain exists of: &peer->endpoint_lock --> &sch->q.lock --> fs_reclaim Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); local_irq_disable(); lock(&peer->endpoint_lock); lock(&sch->q.lock); lock(&peer->endpoint_lock); *** DEADLOCK *** 2 locks held by syz-executor.2/10294: #0: ffff800017b9e948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff800017b9e948 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e8/0xd94 net/core/rtnetlink.c:6094 #1: ffff0000cdfef108 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&peer->endpoint_lock){++-.}-{2:2} { HARDIRQ-ON-W at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x54/0x6c kernel/locking/spinlock.c:334 wg_socket_set_peer_endpoint+0x3fc/0x76c drivers/net/wireguard/socket.c:283 wg_set_device+0xed0/0x1aa4 drivers/net/wireguard/netlink.c:588 genl_family_rcv_msg_doit net/netlink/genetlink.c:756 [inline] genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x948/0xc2c net/netlink/genetlink.c:850 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2524 genl_rcv+0x38/0x50 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1354 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1902 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] __sys_sendto+0x3b4/0x504 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2125 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 HARDIRQ-ON-R at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline] _raw_read_lock_bh+0x60/0x78 kernel/locking/spinlock.c:252 wg_socket_send_skb_to_peer+0x64/0x1a8 drivers/net/wireguard/socket.c:173 wg_socket_send_buffer_to_peer+0xec/0x144 drivers/net/wireguard/socket.c:200 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x1a8/0x2a4 drivers/net/wireguard/send.c:51 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 IN-SOFTIRQ-W at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x54/0x6c kernel/locking/spinlock.c:334 wg_socket_clear_peer_endpoint_src+0x24/0x54 drivers/net/wireguard/socket.c:310 wg_expired_retransmit_handshake+0xc4/0x27c drivers/net/wireguard/timers.c:73 call_timer_fn+0x1c0/0xa1c kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers+0x554/0x718 kernel/time/timer.c:1790 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1803 __do_softirq+0x30c/0xea0 kernel/softirq.c:571 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:84 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:650 irq_exit_rcu+0x14/0x84 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:577 __sanitizer_cov_trace_switch+0x1c/0xec kernel/kcov.c:323 vsnprintf+0x128/0x1998 lib/vsprintf.c:2752 add_uevent_var+0x190/0x3c0 lib/kobject_uevent.c:665 dev_uevent+0x164/0x790 drivers/base/core.c:2550 uevent_show+0x1a4/0x320 drivers/base/core.c:2639 dev_attr_show+0x60/0xcc drivers/base/core.c:2342 sysfs_kf_seq_show+0x2d0/0x43c fs/sysfs/file.c:59 kernfs_seq_show+0x150/0x1fc fs/kernfs/file.c:201 seq_read_iter+0x3e0/0xc44 fs/seq_file.c:230 kernfs_fop_read_iter+0x144/0x5c8 fs/kernfs/file.c:275 call_read_iter include/linux/fs.h:2199 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x5bc/0x8ac fs/read_write.c:470 ksys_read+0x15c/0x26c fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 INITIAL USE at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline] _raw_write_lock_bh+0x54/0x6c kernel/locking/spinlock.c:334 wg_socket_set_peer_endpoint+0x3fc/0x76c drivers/net/wireguard/socket.c:283 wg_set_device+0xed0/0x1aa4 drivers/net/wireguard/netlink.c:588 genl_family_rcv_msg_doit net/netlink/genetlink.c:756 [inline] genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x948/0xc2c net/netlink/genetlink.c:850 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2524 genl_rcv+0x38/0x50 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1354 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1902 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] __sys_sendto+0x3b4/0x504 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2125 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 INITIAL READ USE at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_read_lock_bh include/linux/rwlock_api_smp.h:176 [inline] _raw_read_lock_bh+0x60/0x78 kernel/locking/spinlock.c:252 wg_socket_send_skb_to_peer+0x64/0x1a8 drivers/net/wireguard/socket.c:173 wg_socket_send_buffer_to_peer+0xec/0x144 drivers/net/wireguard/socket.c:200 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x1a8/0x2a4 drivers/net/wireguard/send.c:51 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 } ... key at: [] wg_peer_create.__key.5+0x0/0x20 -> (&sch->q.lock){+...}-{2:2} { HARDIRQ-ON-W at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:355 [inline] dev_reset_queue+0x130/0x1fc net/sched/sch_generic.c:1291 netdev_for_each_tx_queue include/linux/netdevice.h:2453 [inline] dev_deactivate_many+0x540/0xa8c net/sched/sch_generic.c:1359 dev_deactivate+0x13c/0x1fc net/sched/sch_generic.c:1382 linkwatch_do_dev+0x29c/0x3a4 net/core/link_watch.c:166 __linkwatch_run_queue+0x3a0/0x700 net/core/link_watch.c:221 linkwatch_event+0x58/0x68 net/core/link_watch.c:264 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 INITIAL USE at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:355 [inline] dev_reset_queue+0x130/0x1fc net/sched/sch_generic.c:1291 netdev_for_each_tx_queue include/linux/netdevice.h:2453 [inline] dev_deactivate_many+0x540/0xa8c net/sched/sch_generic.c:1359 dev_deactivate+0x13c/0x1fc net/sched/sch_generic.c:1382 linkwatch_do_dev+0x29c/0x3a4 net/core/link_watch.c:166 __linkwatch_run_queue+0x3a0/0x700 net/core/link_watch.c:221 linkwatch_event+0x58/0x68 net/core/link_watch.c:264 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 } ... key at: [] qdisc_alloc.__key+0x0/0x20 ... acquired at: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] __dev_xmit_skb net/core/dev.c:3854 [inline] __dev_queue_xmit+0xb14/0x38d8 net/core/dev.c:4227 dev_queue_xmit include/linux/netdevice.h:3021 [inline] neigh_hh_output include/net/neighbour.h:528 [inline] neigh_output include/net/neighbour.h:542 [inline] ip6_finish_output2+0xd80/0x1a98 net/ipv6/ip6_output.c:134 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] ip6_finish_output+0x538/0x8c8 net/ipv6/ip6_output.c:206 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x270/0x594 net/ipv6/ip6_output.c:227 dst_output include/net/dst.h:444 [inline] ip6_local_out+0x120/0x160 net/ipv6/output_core.c:161 ip6tunnel_xmit include/net/ip6_tunnel.h:161 [inline] udp_tunnel6_xmit_skb+0x48c/0x930 net/ipv6/ip6_udp_tunnel.c:109 send6+0x558/0x924 drivers/net/wireguard/socket.c:152 wg_socket_send_skb_to_peer+0xfc/0x1a8 drivers/net/wireguard/socket.c:178 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x1a8/0x718 drivers/net/wireguard/send.c:276 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (fs_reclaim){+.+.}-{0:0} { HARDIRQ-ON-W at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __fs_reclaim_acquire mm/page_alloc.c:4683 [inline] fs_reclaim_acquire+0x90/0x12c mm/page_alloc.c:4697 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3318 [inline] __kmem_cache_alloc_node+0x58/0x388 mm/slub.c:3437 kmalloc_node_trace+0x44/0x90 mm/slab_common.c:1058 kmalloc_node include/linux/slab.h:575 [inline] kzalloc_node include/linux/slab.h:700 [inline] alloc_worker kernel/workqueue.c:1840 [inline] init_rescuer+0xa4/0x264 kernel/workqueue.c:4269 workqueue_init+0x298/0x5b4 kernel/workqueue.c:6098 kernel_init_freeable+0x33c/0x528 init/main.c:1614 kernel_init+0x24/0x29c init/main.c:1519 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 SOFTIRQ-ON-W at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __fs_reclaim_acquire mm/page_alloc.c:4683 [inline] fs_reclaim_acquire+0x90/0x12c mm/page_alloc.c:4697 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3318 [inline] __kmem_cache_alloc_node+0x58/0x388 mm/slub.c:3437 kmalloc_node_trace+0x44/0x90 mm/slab_common.c:1058 kmalloc_node include/linux/slab.h:575 [inline] kzalloc_node include/linux/slab.h:700 [inline] alloc_worker kernel/workqueue.c:1840 [inline] init_rescuer+0xa4/0x264 kernel/workqueue.c:4269 workqueue_init+0x298/0x5b4 kernel/workqueue.c:6098 kernel_init_freeable+0x33c/0x528 init/main.c:1614 kernel_init+0x24/0x29c init/main.c:1519 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 INITIAL USE at: lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __fs_reclaim_acquire mm/page_alloc.c:4683 [inline] fs_reclaim_acquire+0x90/0x12c mm/page_alloc.c:4697 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3318 [inline] __kmem_cache_alloc_node+0x58/0x388 mm/slub.c:3437 kmalloc_node_trace+0x44/0x90 mm/slab_common.c:1058 kmalloc_node include/linux/slab.h:575 [inline] kzalloc_node include/linux/slab.h:700 [inline] alloc_worker kernel/workqueue.c:1840 [inline] init_rescuer+0xa4/0x264 kernel/workqueue.c:4269 workqueue_init+0x298/0x5b4 kernel/workqueue.c:6098 kernel_init_freeable+0x33c/0x528 init/main.c:1614 kernel_init+0x24/0x29c init/main.c:1519 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 } ... key at: [] __fs_reclaim_map+0x0/0xe0 ... acquired at: __fs_reclaim_acquire mm/page_alloc.c:4683 [inline] fs_reclaim_acquire+0x90/0x12c mm/page_alloc.c:4697 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3318 [inline] __kmem_cache_alloc_node+0x58/0x388 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0xcc/0x1d0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x84/0x1e4 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] get_dist_table+0xa0/0x354 net/sched/sch_netem.c:788 netem_change+0x754/0x1900 net/sched/sch_netem.c:985 netem_init+0x54/0xb8 net/sched/sch_netem.c:1072 qdisc_create+0x70c/0xe64 net/sched/sch_api.c:1314 tc_modify_qdisc+0x9f0/0x1840 rtnetlink_rcv_msg+0x72c/0xd94 net/core/rtnetlink.c:6097 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2524 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6115 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1354 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1902 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x558/0x844 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2565 __do_sys_sendmsg net/socket.c:2574 [inline] __se_sys_sendmsg net/socket.c:2572 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2572 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 stack backtrace: CPU: 1 PID: 10294 Comm: syz-executor.2 Not tainted 6.1.38-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 __lock_acquire+0x6310/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5669 __fs_reclaim_acquire mm/page_alloc.c:4683 [inline] fs_reclaim_acquire+0x90/0x12c mm/page_alloc.c:4697 might_alloc include/linux/sched/mm.h:271 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3318 [inline] __kmem_cache_alloc_node+0x58/0x388 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0xcc/0x1d0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x84/0x1e4 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] get_dist_table+0xa0/0x354 net/sched/sch_netem.c:788 netem_change+0x754/0x1900 net/sched/sch_netem.c:985 netem_init+0x54/0xb8 net/sched/sch_netem.c:1072 qdisc_create+0x70c/0xe64 net/sched/sch_api.c:1314 tc_modify_qdisc+0x9f0/0x1840 rtnetlink_rcv_msg+0x72c/0xd94 net/core/rtnetlink.c:6097 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2524 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6115 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1354 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1902 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x558/0x844 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2565 __do_sys_sendmsg net/socket.c:2574 [inline] __se_sys_sendmsg net/socket.c:2572 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2572 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 10294, name: syz-executor.2 preempt_count: 201, expected: 0 RCU nest depth: 0, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [] sch_tree_lock+0x120/0x1d4 CPU: 1 PID: 10294 Comm: syz-executor.2 Not tainted 6.1.38-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 __might_resched+0x37c/0x4d8 kernel/sched/core.c:9941 __might_sleep+0x90/0xe4 kernel/sched/core.c:9870 might_alloc include/linux/sched/mm.h:274 [inline] slab_pre_alloc_hook mm/slab.h:710 [inline] slab_alloc_node mm/slub.c:3318 [inline] __kmem_cache_alloc_node+0x74/0x388 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0xcc/0x1d0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0x84/0x1e4 mm/util.c:581 kvmalloc include/linux/slab.h:706 [inline] get_dist_table+0xa0/0x354 net/sched/sch_netem.c:788 netem_change+0x754/0x1900 net/sched/sch_netem.c:985 netem_init+0x54/0xb8 net/sched/sch_netem.c:1072 qdisc_create+0x70c/0xe64 net/sched/sch_api.c:1314 tc_modify_qdisc+0x9f0/0x1840 rtnetlink_rcv_msg+0x72c/0xd94 net/core/rtnetlink.c:6097 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2524 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6115 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline] netlink_unicast+0x660/0x8d4 net/netlink/af_netlink.c:1354 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1902 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x558/0x844 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2565 __do_sys_sendmsg net/socket.c:2574 [inline] __se_sys_sendmsg net/socket.c:2572 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2572 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581