possible deadlock in dev_requeue_skb

Status: auto-obsoleted due to no activity on 2024/10/11 02:24
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+e0e18fa7a2b40aa3562e@syzkaller.appspotmail.com
First crash: 1146d, last: 1097d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/07/02 linux-5.15.y (ToT) 4af60700a60c C [report] BUG: sleeping function called from invalid context in get_dist_table
2023/07/02 upstream (ToT) 995b406c7e97 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 possible deadlock in dev_requeue_skb 4 55 1098d 1146d 0/3 auto-obsoleted due to no activity on 2023/10/25 01:20
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/10/11 02:07 16m retest repro linux-5.15.y no crash log
▶ ▼ Fix bisection attempts (9)
Created Duration User Patch Repo Result
2024/09/28 09:45 1h03m fix candidate upstream error job log
2024/08/21 19:24 0m fix candidate upstream error job log
2024/07/08 00:51 0m fix candidate upstream error job log
2024/04/25 23:55 1m fix candidate upstream error job log
2024/03/25 10:54 1h31m fix candidate upstream error job log
2024/02/08 09:24 0m fix candidate upstream error job log
2023/12/20 15:54 6m fix candidate upstream error job log
2023/11/18 13:18 0m fix candidate upstream error job log
2023/10/08 08:54 0m bisect fix linux-5.15.y error job log

Sample crash report:
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.15.119-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor558/3960 [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:
ffff0000cb09f108 (&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
  lapbeth_data_transmit+0x1dc/0x294 drivers/net/wan/lapbether.c:259
  lapb_data_transmit+0x8c/0xb0 net/lapb/lapb_iface.c:447
  lapb_transmit_buffer+0x178/0x204 net/lapb/lapb_out.c:149
  lapb_send_control+0x220/0x320 net/lapb/lapb_subr.c:251
  lapb_t1timer_expiry+0x4f4/0x8bc
  call_timer_fn+0x19c/0x8f0 kernel/time/timer.c:1421
  expire_timers kernel/time/timer.c:1466 [inline]
  __run_timers+0x554/0x718 kernel/time/timer.c:1737
  run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1750
  __do_softirq+0x344/0xe20 kernel/softirq.c:558
  do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
  invoke_softirq kernel/softirq.c:439 [inline]
  __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:636
  irq_exit+0x14/0x88 kernel/softirq.c:660
  handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710
  gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:758
  call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899
  do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267
  el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:442
  el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:458
  el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580
  arch_local_irq_enable+0xc/0x18 arch/arm64/include/asm/irqflags.h:35
  default_idle_call+0xcc/0x4a8 kernel/sched/idle.c:112
  cpuidle_idle_call kernel/sched/idle.c:194 [inline]
  do_idle+0x1d4/0x4dc kernel/sched/idle.c:306
  cpu_startup_entry+0x24/0x28 kernel/sched/idle.c:403
  secondary_start_kernel+0x240/0x298 arch/arm64/kernel/smp.c:265
  __secondary_switched+0x94/0x98 arch/arm64/kernel/head.S:661

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-executor558/3960:
 #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: ffff0000cb09f108 (&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
                    lapbeth_data_transmit+0x1dc/0x294 drivers/net/wan/lapbether.c:259
                    lapb_data_transmit+0x8c/0xb0 net/lapb/lapb_iface.c:447
                    lapb_transmit_buffer+0x178/0x204 net/lapb/lapb_out.c:149
                    lapb_send_control+0x220/0x320 net/lapb/lapb_subr.c:251
                    lapb_t1timer_expiry+0x4f4/0x8bc
                    call_timer_fn+0x19c/0x8f0 kernel/time/timer.c:1421
                    expire_timers kernel/time/timer.c:1466 [inline]
                    __run_timers+0x554/0x718 kernel/time/timer.c:1737
                    run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1750
                    __do_softirq+0x344/0xe20 kernel/softirq.c:558
                    do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
                    invoke_softirq kernel/softirq.c:439 [inline]
                    __irq_exit_rcu+0x28c/0x534 kernel/softirq.c:636
                    irq_exit+0x14/0x88 kernel/softirq.c:660
                    handle_domain_irq+0xf4/0x178 kernel/irq/irqdesc.c:710
                    gic_handle_irq+0x78/0x1c8 drivers/irqchip/irq-gic-v3.c:758
                    call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:899
                    do_interrupt_handler+0x74/0x94 arch/arm64/kernel/entry-common.c:267
                    el1_interrupt+0x30/0x58 arch/arm64/kernel/entry-common.c:442
                    el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:458
                    el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:580
                    arch_local_irq_enable+0xc/0x18 arch/arm64/include/asm/irqflags.h:35
                    default_idle_call+0xcc/0x4a8 kernel/sched/idle.c:112
                    cpuidle_idle_call kernel/sched/idle.c:194 [inline]
                    do_idle+0x1d4/0x4dc kernel/sched/idle.c:306
                    cpu_startup_entry+0x24/0x28 kernel/sched/idle.c:403
                    secondary_start_kernel+0x240/0x298 arch/arm64/kernel/smp.c:265
                    __secondary_switched+0x94/0x98 arch/arm64/kernel/head.S:661
   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: 3960 Comm: syz-executor558 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: 3960, name: syz-executor558
INFO: lockdep is turned off.
Preemption disabled at:
[<ffff800010049c20>] netem_change+0x22c/0x1a90 net/sched/sch_netem.c:972
CPU: 1 PID: 3960 Comm: syz-executor558 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

Crashes (50):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/07/02 06:25 linux-5.15.y 4af60700a60c bfc47836 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/01 01:53 linux-5.15.y 4af60700a60c af3053d2 .config console log report info ci2-linux-5-15-kasan possible deadlock in dev_requeue_skb
2023/08/16 06:36 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/16 01:57 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/15 10:10 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/15 07:27 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/15 00:18 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/14 08:52 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/13 19:58 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/13 14:16 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/13 14:06 linux-5.15.y 24c4de4069cb 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/08 17:23 linux-5.15.y 38d4ca22a528 9552ae77 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/05 20:07 linux-5.15.y 38d4ca22a528 4ffcc9ef .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/08/02 01:13 linux-5.15.y 09996673e313 df07ffe8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/31 19:18 linux-5.15.y 09996673e313 2a0d0f29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/31 17:09 linux-5.15.y 09996673e313 2a0d0f29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/30 22:55 linux-5.15.y 09996673e313 2a0d0f29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/29 02:40 linux-5.15.y 09996673e313 92476829 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/27 01:14 linux-5.15.y 5c6a716301d9 41fe1bae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/27 00:56 linux-5.15.y 5c6a716301d9 41fe1bae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/26 02:26 linux-5.15.y 5c6a716301d9 6756545c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/18 19:59 linux-5.15.y d54cfc420586 022df2bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/18 19:53 linux-5.15.y d54cfc420586 022df2bb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/16 15:49 linux-5.15.y d54cfc420586 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/15 17:24 linux-5.15.y d54cfc420586 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/15 15:46 linux-5.15.y d54cfc420586 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/12 02:49 linux-5.15.y d54cfc420586 2f19aa4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/12 02:33 linux-5.15.y d54cfc420586 2f19aa4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/10 20:22 linux-5.15.y d54cfc420586 d47e94ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/10 08:42 linux-5.15.y d54cfc420586 668cb1fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/10 03:26 linux-5.15.y d54cfc420586 668cb1fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/10 03:23 linux-5.15.y d54cfc420586 668cb1fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/09 12:48 linux-5.15.y d54cfc420586 668cb1fa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/07 10:21 linux-5.15.y d54cfc420586 22ae5830 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/02 21:42 linux-5.15.y 4af60700a60c bfc47836 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/01 19:31 linux-5.15.y 4af60700a60c bfc47836 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/01 01:09 linux-5.15.y 4af60700a60c af3053d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/07/01 00:12 linux-5.15.y 4af60700a60c af3053d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/29 18:39 linux-5.15.y 4af60700a60c 134ddc02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/29 03:06 linux-5.15.y 4af60700a60c ca69c785 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/29 02:49 linux-5.15.y 4af60700a60c ca69c785 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/28 22:33 linux-5.15.y 4af60700a60c ca69c785 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/28 20:01 linux-5.15.y 4af60700a60c ca69c785 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/28 19:30 linux-5.15.y 4af60700a60c ca69c785 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/28 18:17 linux-5.15.y 4af60700a60c ca69c785 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/28 16:24 linux-5.15.y 4af60700a60c 4cd5bb25 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/28 13:38 linux-5.15.y 4af60700a60c 4cd5bb25 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
2023/06/28 12:16 linux-5.15.y 4af60700a60c 4cd5bb25 .config console log report info ci2-linux-5-15-kasan-arm64 possible deadlock in dev_requeue_skb
* Struck through repros no longer work on HEAD.