syzbot


possible deadlock in wg_socket_clear_peer_endpoint_src

Status: auto-obsoleted due to no activity on 2023/10/21 00:03
Reported-by: syzbot+7460f7aacf78cbe044a1@syzkaller.appspotmail.com
First crash: 519d, last: 519d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 possible deadlock in wg_socket_clear_peer_endpoint_src 3 485d 530d 0/3 auto-obsoleted due to no activity on 2023/11/24 01:24

Sample crash report:
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);
  <Interrupt>
    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: [<ffff8000199c7080>] 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: [<ffff800019a4eae0>] 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: [<ffff80001586bd40>] __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:
[<ffff8000106c0d88>] 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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/07/13 00:02 linux-6.1.y 61fd484b2cf6 979d5fe2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 possible deadlock in wg_socket_clear_peer_endpoint_src
* Struck through repros no longer work on HEAD.