netlink: 164 bytes leftover after parsing attributes in process `syz-executor.3'. ===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 6.4.0-rc7-syzkaller-00194-g8a28a0b6f1a1 #0 Not tainted ----------------------------------------------------- syz-executor.3/11739 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: ffffffff8c8e9a80 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8c8e9a80 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:670 [inline] ffffffff8c8e9a80 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slab.c:3240 [inline] ffffffff8c8e9a80 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3540 and this task is already holding: ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:355 [inline] ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: sch_tree_lock include/net/sch_generic.h:576 [inline] ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: sch_tree_lock include/net/sch_generic.h:571 [inline] ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: netem_change+0x1520/0x1f70 net/sched/sch_netem.c:969 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 kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] dev_requeue_skb net/sched/sch_generic.c:148 [inline] sch_direct_xmit+0xa49/0xc30 net/sched/sch_generic.c:362 __dev_xmit_skb net/core/dev.c:3805 [inline] __dev_queue_xmit+0x14d6/0x3b10 net/core/dev.c:4210 dev_queue_xmit include/linux/netdevice.h:3088 [inline] neigh_hh_output include/net/neighbour.h:528 [inline] neigh_output include/net/neighbour.h:542 [inline] ip_finish_output2+0x15a1/0x22b0 net/ipv4/ip_output.c:229 __ip_finish_output net/ipv4/ip_output.c:307 [inline] __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:289 ip_finish_output+0x31/0x280 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip_output+0x1a3/0x320 net/ipv4/ip_output.c:431 dst_output include/net/dst.h:458 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8d9/0x1c50 net/ipv4/ip_output.c:533 __tcp_transmit_skb+0x194b/0x3800 net/ipv4/tcp_output.c:1399 __tcp_send_ack.part.0+0x3a5/0x760 net/ipv4/tcp_output.c:3983 __tcp_send_ack net/ipv4/tcp_output.c:3989 [inline] tcp_send_ack+0x81/0xa0 net/ipv4/tcp_output.c:3989 __tcp_ack_snd_check+0x156/0x9e0 net/ipv4/tcp_input.c:5536 tcp_rcv_established+0x192c/0x1f90 net/ipv4/tcp_input.c:5982 tcp_v4_do_rcv+0x65a/0x9c0 net/ipv4/tcp_ipv4.c:1722 tcp_v4_rcv+0x30ed/0x3300 net/ipv4/tcp_ipv4.c:2144 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2ec/0x520 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:303 [inline] NF_HOOK include/linux/netfilter.h:297 [inline] ip_local_deliver+0x1ae/0x200 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:468 [inline] ip_sublist_rcv_finish+0x9a/0x2c0 net/ipv4/ip_input.c:580 ip_list_rcv_finish.constprop.0+0x4f9/0x6c0 net/ipv4/ip_input.c:630 ip_sublist_rcv net/ipv4/ip_input.c:638 [inline] ip_list_rcv+0x347/0x4a0 net/ipv4/ip_input.c:673 __netif_receive_skb_list_ptype net/core/dev.c:5536 [inline] __netif_receive_skb_list_core+0x548/0x8f0 net/core/dev.c:5584 __netif_receive_skb_list net/core/dev.c:5636 [inline] netif_receive_skb_list_internal+0x75f/0xdc0 net/core/dev.c:5727 gro_normal_list include/net/gro.h:433 [inline] gro_normal_one include/net/gro.h:446 [inline] napi_gro_complete.constprop.0+0x5a7/0x700 net/core/gro.c:328 dev_gro_receive+0x128f/0x28d0 net/core/gro.c:552 napi_gro_receive+0x27c/0xab0 net/core/gro.c:657 e1000_receive_skb drivers/net/ethernet/intel/e1000/e1000_main.c:4008 [inline] e1000_clean_rx_irq+0x50e/0x1010 drivers/net/ethernet/intel/e1000/e1000_main.c:4461 e1000_clean+0x9bf/0x26b0 drivers/net/ethernet/intel/e1000/e1000_main.c:3803 __napi_poll+0xb7/0x6f0 net/core/dev.c:6498 napi_poll net/core/dev.c:6565 [inline] net_rx_action+0x8a9/0xcb0 net/core/dev.c:6698 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662 common_interrupt+0xad/0xd0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] default_idle+0xf/0x20 arch/x86/kernel/process.c:710 default_idle_call+0x67/0xa0 kernel/sched/idle.c:97 cpuidle_idle_call kernel/sched/idle.c:170 [inline] do_idle+0x317/0x3c0 kernel/sched/idle.c:282 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379 start_secondary+0x221/0x2b0 arch/x86/kernel/smpboot.c:269 secondary_startup_64_no_verify+0xf4/0xfb to a SOFTIRQ-irq-unsafe lock: (fs_reclaim){+.+.}-{0:0} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __fs_reclaim_acquire mm/page_alloc.c:3893 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3907 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slab.c:3240 [inline] __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] alloc_workqueue_attrs kernel/workqueue.c:3510 [inline] wq_numa_init kernel/workqueue.c:6216 [inline] workqueue_init+0xf5/0xd40 kernel/workqueue.c:6343 kernel_init_freeable+0x34c/0xba0 init/main.c:1557 kernel_init+0x1e/0x2c0 init/main.c:1462 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 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); lock(&sch->q.lock); *** DEADLOCK *** 2 locks held by syz-executor.3/11739: #0: ffffffff8e10bbe8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline] #0: ffffffff8e10bbe8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3e8/0xd50 net/core/rtnetlink.c:6414 #1: ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:355 [inline] #1: ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: sch_tree_lock include/net/sch_generic.h:576 [inline] #1: ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: sch_tree_lock include/net/sch_generic.h:571 [inline] #1: ffff888021bd5108 (&sch->q.lock){+.-.}-{2:2}, at: netem_change+0x1520/0x1f70 net/sched/sch_netem.c:969 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&sch->q.lock){+.-.}-{2:2} { HARDIRQ-ON-W at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:355 [inline] dev_reset_queue+0xab/0x1d0 net/sched/sch_generic.c:1291 netdev_for_each_tx_queue include/linux/netdevice.h:2517 [inline] dev_deactivate_many+0x36d/0xb00 net/sched/sch_generic.c:1359 dev_deactivate+0xed/0x1b0 net/sched/sch_generic.c:1382 linkwatch_do_dev+0x101/0x150 net/core/link_watch.c:180 __linkwatch_run_queue+0x23f/0x6a0 net/core/link_watch.c:235 linkwatch_event+0x4e/0x70 net/core/link_watch.c:278 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] dev_requeue_skb net/sched/sch_generic.c:148 [inline] sch_direct_xmit+0xa49/0xc30 net/sched/sch_generic.c:362 __dev_xmit_skb net/core/dev.c:3805 [inline] __dev_queue_xmit+0x14d6/0x3b10 net/core/dev.c:4210 dev_queue_xmit include/linux/netdevice.h:3088 [inline] neigh_hh_output include/net/neighbour.h:528 [inline] neigh_output include/net/neighbour.h:542 [inline] ip_finish_output2+0x15a1/0x22b0 net/ipv4/ip_output.c:229 __ip_finish_output net/ipv4/ip_output.c:307 [inline] __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:289 ip_finish_output+0x31/0x280 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:292 [inline] ip_output+0x1a3/0x320 net/ipv4/ip_output.c:431 dst_output include/net/dst.h:458 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8d9/0x1c50 net/ipv4/ip_output.c:533 __tcp_transmit_skb+0x194b/0x3800 net/ipv4/tcp_output.c:1399 __tcp_send_ack.part.0+0x3a5/0x760 net/ipv4/tcp_output.c:3983 __tcp_send_ack net/ipv4/tcp_output.c:3989 [inline] tcp_send_ack+0x81/0xa0 net/ipv4/tcp_output.c:3989 __tcp_ack_snd_check+0x156/0x9e0 net/ipv4/tcp_input.c:5536 tcp_rcv_established+0x192c/0x1f90 net/ipv4/tcp_input.c:5982 tcp_v4_do_rcv+0x65a/0x9c0 net/ipv4/tcp_ipv4.c:1722 tcp_v4_rcv+0x30ed/0x3300 net/ipv4/tcp_ipv4.c:2144 ip_protocol_deliver_rcu+0x9f/0x480 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2ec/0x520 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:303 [inline] NF_HOOK include/linux/netfilter.h:297 [inline] ip_local_deliver+0x1ae/0x200 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:468 [inline] ip_sublist_rcv_finish+0x9a/0x2c0 net/ipv4/ip_input.c:580 ip_list_rcv_finish.constprop.0+0x4f9/0x6c0 net/ipv4/ip_input.c:630 ip_sublist_rcv net/ipv4/ip_input.c:638 [inline] ip_list_rcv+0x347/0x4a0 net/ipv4/ip_input.c:673 __netif_receive_skb_list_ptype net/core/dev.c:5536 [inline] __netif_receive_skb_list_core+0x548/0x8f0 net/core/dev.c:5584 __netif_receive_skb_list net/core/dev.c:5636 [inline] netif_receive_skb_list_internal+0x75f/0xdc0 net/core/dev.c:5727 gro_normal_list include/net/gro.h:433 [inline] gro_normal_one include/net/gro.h:446 [inline] napi_gro_complete.constprop.0+0x5a7/0x700 net/core/gro.c:328 dev_gro_receive+0x128f/0x28d0 net/core/gro.c:552 napi_gro_receive+0x27c/0xab0 net/core/gro.c:657 e1000_receive_skb drivers/net/ethernet/intel/e1000/e1000_main.c:4008 [inline] e1000_clean_rx_irq+0x50e/0x1010 drivers/net/ethernet/intel/e1000/e1000_main.c:4461 e1000_clean+0x9bf/0x26b0 drivers/net/ethernet/intel/e1000/e1000_main.c:3803 __napi_poll+0xb7/0x6f0 net/core/dev.c:6498 napi_poll net/core/dev.c:6565 [inline] net_rx_action+0x8a9/0xcb0 net/core/dev.c:6698 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662 common_interrupt+0xad/0xd0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] default_idle+0xf/0x20 arch/x86/kernel/process.c:710 default_idle_call+0x67/0xa0 kernel/sched/idle.c:97 cpuidle_idle_call kernel/sched/idle.c:170 [inline] do_idle+0x317/0x3c0 kernel/sched/idle.c:282 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379 start_secondary+0x221/0x2b0 arch/x86/kernel/smpboot.c:269 secondary_startup_64_no_verify+0xf4/0xfb INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:355 [inline] dev_reset_queue+0xab/0x1d0 net/sched/sch_generic.c:1291 netdev_for_each_tx_queue include/linux/netdevice.h:2517 [inline] dev_deactivate_many+0x36d/0xb00 net/sched/sch_generic.c:1359 dev_deactivate+0xed/0x1b0 net/sched/sch_generic.c:1382 linkwatch_do_dev+0x101/0x150 net/core/link_watch.c:180 __linkwatch_run_queue+0x23f/0x6a0 net/core/link_watch.c:235 linkwatch_event+0x4e/0x70 net/core/link_watch.c:278 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 } ... key at: [] __key.4+0x0/0x40 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (fs_reclaim){+.+.}-{0:0} { HARDIRQ-ON-W at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __fs_reclaim_acquire mm/page_alloc.c:3893 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3907 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slab.c:3240 [inline] __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] alloc_workqueue_attrs kernel/workqueue.c:3510 [inline] wq_numa_init kernel/workqueue.c:6216 [inline] workqueue_init+0xf5/0xd40 kernel/workqueue.c:6343 kernel_init_freeable+0x34c/0xba0 init/main.c:1557 kernel_init+0x1e/0x2c0 init/main.c:1462 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 SOFTIRQ-ON-W at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __fs_reclaim_acquire mm/page_alloc.c:3893 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3907 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slab.c:3240 [inline] __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] alloc_workqueue_attrs kernel/workqueue.c:3510 [inline] wq_numa_init kernel/workqueue.c:6216 [inline] workqueue_init+0xf5/0xd40 kernel/workqueue.c:6343 kernel_init_freeable+0x34c/0xba0 init/main.c:1557 kernel_init+0x1e/0x2c0 init/main.c:1462 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __fs_reclaim_acquire mm/page_alloc.c:3893 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3907 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slab.c:3240 [inline] __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] alloc_workqueue_attrs kernel/workqueue.c:3510 [inline] wq_numa_init kernel/workqueue.c:6216 [inline] workqueue_init+0xf5/0xd40 kernel/workqueue.c:6343 kernel_init_freeable+0x34c/0xba0 init/main.c:1557 kernel_init+0x1e/0x2c0 init/main.c:1462 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 } ... key at: [] __fs_reclaim_map+0x0/0xe0 ... acquired at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __fs_reclaim_acquire mm/page_alloc.c:3893 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3907 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slab.c:3240 [inline] __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3540 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:697 [inline] get_dist_table+0x8e/0x3a0 net/sched/sch_netem.c:788 netem_change+0x57c/0x1f70 net/sched/sch_netem.c:985 netem_init+0x70/0xc0 net/sched/sch_netem.c:1072 qdisc_create+0x4d1/0x10c0 net/sched/sch_api.c:1326 tc_modify_qdisc+0x488/0x1c30 net/sched/sch_api.c:1720 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd stack backtrace: CPU: 2 PID: 11739 Comm: syz-executor.3 Not tainted 6.4.0-rc7-syzkaller-00194-g8a28a0b6f1a1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2627 [inline] check_irq_usage+0x114e/0x1a40 kernel/locking/lockdep.c:2866 check_prev_add kernel/locking/lockdep.c:3117 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fe5/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __fs_reclaim_acquire mm/page_alloc.c:3893 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3907 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slab.c:3240 [inline] __kmem_cache_alloc_node+0x3b/0x3f0 mm/slab.c:3540 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:697 [inline] get_dist_table+0x8e/0x3a0 net/sched/sch_netem.c:788 netem_change+0x57c/0x1f70 net/sched/sch_netem.c:985 netem_init+0x70/0xc0 net/sched/sch_netem.c:1072 qdisc_create+0x4d1/0x10c0 net/sched/sch_api.c:1326 tc_modify_qdisc+0x488/0x1c30 net/sched/sch_api.c:1720 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0ec768c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0ec844a168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0ec77abf80 RCX: 00007f0ec768c389 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007f0ec76d7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe957b59ff R14: 00007f0ec844a300 R15: 0000000000022000 BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 11739, name: syz-executor.3 preempt_count: 201, expected: 0 RCU nest depth: 0, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 2 PID: 11739 Comm: syz-executor.3 Not tainted 6.4.0-rc7-syzkaller-00194-g8a28a0b6f1a1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x136/0x150 lib/dump_stack.c:106 __might_resched+0x358/0x580 kernel/sched/core.c:10153 might_alloc include/linux/sched/mm.h:306 [inline] slab_pre_alloc_hook mm/slab.h:670 [inline] slab_alloc_node mm/slab.c:3240 [inline] __kmem_cache_alloc_node+0x235/0x3f0 mm/slab.c:3540 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:697 [inline] get_dist_table+0x8e/0x3a0 net/sched/sch_netem.c:788 netem_change+0x57c/0x1f70 net/sched/sch_netem.c:985 netem_init+0x70/0xc0 net/sched/sch_netem.c:1072 qdisc_create+0x4d1/0x10c0 net/sched/sch_api.c:1326 tc_modify_qdisc+0x488/0x1c30 net/sched/sch_api.c:1720 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6417 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2546 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1913 sock_sendmsg_nosec net/socket.c:724 [inline] sock_sendmsg+0xde/0x190 net/socket.c:747 ____sys_sendmsg+0x71c/0x900 net/socket.c:2503 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2557 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0ec768c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0ec844a168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0ec77abf80 RCX: 00007f0ec768c389 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00007f0ec76d7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe957b59ff R14: 00007f0ec844a300 R15: 0000000000022000