syzbot

INFO: task syz.4.288:9157 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc2-syzkaller-00100-geb952c47d154 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.288       state:D stack:23264 pid:9157  tgid:9156  ppid:7440   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 percpu_rwsem_wait+0x3c2/0x450 kernel/locking/percpu-rwsem.c:162
 __percpu_down_read+0xee/0x130 kernel/locking/percpu-rwsem.c:177
 percpu_down_read include/linux/percpu-rwsem.h:65 [inline]
 __sb_start_write include/linux/fs.h:1716 [inline]
 sb_start_write+0x184/0x1c0 include/linux/fs.h:1852
 mnt_want_write+0x3f/0x90 fs/namespace.c:515
 filename_create+0x184/0x540 fs/namei.c:4019
 do_symlinkat+0xf9/0x3a0 fs/namei.c:4634
 __do_sys_symlinkat fs/namei.c:4657 [inline]
 __se_sys_symlinkat fs/namei.c:4654 [inline]
 __x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4654
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdc49b7dff9
RSP: 002b:00007fdc4a921038 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007fdc49d35f80 RCX: 00007fdc49b7dff9
RDX: 0000000020000000 RSI: ffffffffffffff9c RDI: 00000000200001c0
RBP: 00007fdc49bf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdc49d35f80 R15: 00007ffef9513ca8
 </TASK>
INFO: task syz.4.288:9169 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc2-syzkaller-00100-geb952c47d154 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.288       state:D stack:24864 pid:9169  tgid:9156  ppid:7440   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 xfs_ail_push_all_sync+0x236/0x310 fs/xfs/xfs_trans_ail.c:726
 xfs_log_quiesce+0xdf/0x5b0 fs/xfs/xfs_log.c:1018
 xfs_fs_freeze+0x8d/0x1a0 fs/xfs/xfs_super.c:936
 freeze_super+0x81b/0xee0 fs/super.c:2107
 fs_bdev_freeze+0x1ac/0x320 fs/super.c:1484
 bdev_freeze+0xd6/0x220 block/bdev.c:257
 xfs_fs_goingdown+0xa9/0x160 fs/xfs/xfs_fsops.c:446
 xfs_file_ioctl+0x12e5/0x1a30 fs/xfs/xfs_ioctl.c:1343
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdc49b7dff9
RSP: 002b:00007fdc4a900038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdc49d36058 RCX: 00007fdc49b7dff9
RDX: 0000000020000080 RSI: 000000008004587d RDI: 0000000000000006
RBP: 00007fdc49bf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdc49d36058 R15: 00007ffef9513ca8
 </TASK>
INFO: task syz.4.288:9171 blocked for more than 144 seconds.
      Not tainted 6.12.0-rc2-syzkaller-00100-geb952c47d154 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.288       state:D stack:24320 pid:9171  tgid:9156  ppid:7440   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 percpu_rwsem_wait+0x3c2/0x450 kernel/locking/percpu-rwsem.c:162
 __percpu_down_read+0xee/0x130 kernel/locking/percpu-rwsem.c:177
 percpu_down_read include/linux/percpu-rwsem.h:65 [inline]
 __sb_start_write include/linux/fs.h:1716 [inline]
 sb_start_write+0x184/0x1c0 include/linux/fs.h:1852
 mnt_want_write+0x3f/0x90 fs/namespace.c:515
 filename_create+0x184/0x540 fs/namei.c:4019
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4272
 __do_sys_mkdirat fs/namei.c:4295 [inline]
 __se_sys_mkdirat fs/namei.c:4293 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdc49b7c897
RSP: 002b:00007fdc4a8dee68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fdc4a8deef0 RCX: 00007fdc49b7c897
RDX: 00000000000001ff RSI: 0000000020000040 RDI: 00000000ffffff9c
RBP: 0000000020000140 R08: 0000000020000000 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 0000000020000040
R13: 00007fdc4a8deeb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
3 locks held by kworker/u8:7/2580:
1 lock held by klogd/4662:
2 locks held by getty/4981:
 #0: ffff88803289a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by kworker/1:6/5300:
 #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: ffff8880b8728948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 kernel/sched/psi.c:987
 #2: ffff888063598240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1488
3 locks held by kworker/u8:10/5417:
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
 #1: ffffc900047efd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
 #1: ffffc900047efd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
 #2: ffffffff8fcbf8c8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
1 lock held by syz.4.288/9157:
 #0: ffff8880791b6420 (sb_writers#19){++++}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
5 locks held by syz.4.288/9169:
 #0: ffff888148c9f4b0 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: bdev_freeze+0x2a/0x220 block/bdev.c:248
 #1: ffff8880791b6420 (sb_writers#19){++++}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline]
 #1: ffff8880791b6420 (sb_writers#19){++++}-{0:0}, at: freeze_super+0x4e9/0xee0 fs/super.c:2085
 #2: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #2: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #2: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: freeze_super+0x4f1/0xee0 fs/super.c:2086
 #3: ffff8880791b6518 (sb_pagefaults#3){++++}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline]
 #3: ffff8880791b6518 (sb_pagefaults#3){++++}-{0:0}, at: freeze_super+0x519/0xee0 fs/super.c:2090
 #4: ffff8880791b6610 (sb_internal#4){++++}-{0:0}, at: sb_wait_write fs/super.c:1896 [inline]
 #4: ffff8880791b6610 (sb_internal#4){++++}-{0:0}, at: freeze_super+0x7cc/0xee0 fs/super.c:2104
1 lock held by syz.4.288/9171:
 #0: ffff8880791b6420 (sb_writers#19){++++}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515
1 lock held by syz.2.302/9430:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.3.304/9519:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.0.312/9585:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.4.334/9777:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.3.383/10033:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.0.384/10064:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.1.404/10183:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.2.423/10257:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.4.426/10271:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
1 lock held by syz.3.400/10275:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.1.454/10422:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.0.486/10534:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
2 locks held by syz-executor/10551:
 #0: ffffffff8fcbf8c8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fcbf8c8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3517
 #1: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
 #1: ffffffff8e93d378 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
1 lock held by syz.4.510/10618:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz.2.514/10662:
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880791b60e0 (&type->s_umount_key#65){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz-executor/10745:
 #0: ffffffff8fcbf8c8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline]
 #0: ffffffff8fcbf8c8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3517
3 locks held by syz.0.506/10758:
 #0: ffff8880273fcd80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:481 [inline]
 #0: ffff8880273fcd80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2698
 #1: ffff8880273fc078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x572/0x11a0 net/bluetooth/hci_sync.c:5183
 #2: ffffffff8fe2c168 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1972 [inline]
 #2: ffffffff8fe2c168 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2589
2 locks held by syz.1.523/10759:
 #0: ffff88803b0c4d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:481 [inline]
 #0: ffff88803b0c4d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2698
 #1: ffff88803b0c4078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x572/0x11a0 net/bluetooth/hci_sync.c:5183

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00100-geb952c47d154 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5416 Comm: kworker/u8:9 Not tainted 6.12.0-rc2-syzkaller-00100-geb952c47d154 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:hlock_id kernel/locking/lockdep.c:430 [inline]
RIP: 0010:__lock_acquire+0xdbd/0x2050 kernel/locking/lockdep.c:5190
Code: c3 00 60 00 00 74 0d 41 bc 01 00 00 00 49 c7 c6 ff ff ff ff 48 8b 44 24 20 0f b6 04 38 84 c0 0f 85 f4 0b 00 00 48 8b 44 24 10 <8b> 18 48 83 bc 24 c8 00 00 00 00 0f 84 99 00 00 00 48 8b 44 24 38
RSP: 0018:ffffc90000a18750 EFLAGS: 00000046
RAX: ffff888020bd47a0 RBX: 00000000000c0073 RCX: ffff888020bd46e0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000
RBP: ffff888020bd4780 R08: ffffffff9429080f R09: 1ffffffff2852101
R10: dffffc0000000000 R11: fffffbfff2852102 R12: 0000000000000000
R13: ffff888020bd46d8 R14: e3a7f52acf58201d R15: ffff888020bd47a0
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd2cc467d60 CR3: 000000000e734000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 seqcount_lockdep_reader_access+0x13f/0x220 include/linux/seqlock.h:73
 timekeeping_debug_get_ns kernel/time/timekeeping.c:256 [inline]
 timekeeping_get_ns+0x5c/0x420 kernel/time/timekeeping.c:401
 ktime_get_with_offset+0xed/0x150 kernel/time/timekeeping.c:893
 ktime_get_real include/linux/timekeeping.h:82 [inline]
 mac80211_hwsim_get_tsf_raw drivers/net/wireless/virtual/mac80211_hwsim.c:1208 [inline]
 __mac80211_hwsim_beacon_tx+0x2d7/0x6e0 drivers/net/wireless/virtual/mac80211_hwsim.c:2250
 mac80211_hwsim_beacon_tx+0x3bf/0x850 drivers/net/wireless/virtual/mac80211_hwsim.c:2315
 __iterate_interfaces+0x222/0x510 net/mac80211/util.c:774
 ieee80211_iterate_active_interfaces_atomic+0xd8/0x170 net/mac80211/util.c:810
 mac80211_hwsim_beacon+0xd4/0x1f0 drivers/net/wireless/virtual/mac80211_hwsim.c:2345
 __run_hrtimer kernel/time/hrtimer.c:1691 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1755
 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1772
 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5829
Code: 2b 00 74 08 4c 89 f7 e8 5a 1c 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900047df9e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920008fbf48 RCX: efaf994c7dece300
RDX: dffffc0000000000 RSI: ffffffff8c0adc40 RDI: ffffffff8c602720
RBP: ffffc900047dfb40 R08: ffffffff94290807 R09: 1ffffffff2852100
R10: dffffc0000000000 R11: fffffbfff2852101 R12: 1ffff920008fbf44
R13: dffffc0000000000 R14: ffffc900047dfa40 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0xec/0x610 net/batman-adv/network-coding.c:719
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>