INFO: task hung in cfg80211_event_work

From: syzbot
Date: Mon Dec 14 2020 - 05:34:31 EST

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Hello,

syzbot found the following issue on:

HEAD commit: a68a0262 mm/madvise: remove racy mm ownership check
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15bb9413500000
kernel config: https://syzkaller.appspot.com/x/.config?x=59df2a4dced5f928
dashboard link: https://syzkaller.appspot.com/bug?extid=84fea7179610ae50a9c7
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1169fa13500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1240f123500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+84fea7179610ae50a9c7@xxxxxxxxxxxxxxxxxxxxxxxxx

INFO: task kworker/u4:2:58 blocked for more than 161 seconds.
Not tainted 5.10.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2 state:D stack:23600 pid: 58 ppid: 2 flags:0x00004000
Workqueue: cfg80211 cfg80211_event_work
Call Trace:
context_switch kernel/sched/core.c:3779 [inline]
__schedule+0x893/0x2130 kernel/sched/core.c:4528
schedule+0xcf/0x270 kernel/sched/core.c:4606
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4665
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
cfg80211_event_work+0xe/0x20 net/wireless/core.c:321
process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Showing all locks held in the system:
2 locks held by kworker/0:0/5:
#0: ffff888010066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888010066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff888010066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff888010066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff888010066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff888010066538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc90000ca7da8 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
3 locks held by kworker/1:0/17:
3 locks held by kworker/u4:2/58:
#0: ffff888141147138 ((wq_completion)cfg80211){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888141147138 ((wq_completion)cfg80211){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff888141147138 ((wq_completion)cfg80211){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff888141147138 ((wq_completion)cfg80211){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff888141147138 ((wq_completion)cfg80211){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff888141147138 ((wq_completion)cfg80211){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc90000f2fda8 ((work_completion)(&rdev->event_work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
#2: ffffffff8c927908 (rtnl_mutex){+.+.}-{3:3}, at: cfg80211_event_work+0xe/0x20 net/wireless/core.c:321
1 lock held by khungtaskd/1657:
#0: ffffffff8b3378e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254
1 lock held by khugepaged/1664:
#0: ffffffff8b4062a8 (lock#5){+.+.}-{3:3}, at: lru_add_drain_all+0x5f/0x6f0 mm/swap.c:801
1 lock held by in:imklog/8161:
#0: ffff88801c8459f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932
2 locks held by syz-executor702/8473:
#0: ffffffff8c9aec50 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:810
#1: ffffffff8c927908 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x34f/0x630 net/wireless/nl80211.c:14579
2 locks held by syz-executor702/8474:
#0: ffffffff8c9aec50 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:810
#1: ffffffff8c9aed08 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8c9aed08 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:798
2 locks held by syz-executor702/8476:
#0: ffffffff8c9aec50 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:810
#1: ffffffff8c9aed08 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8c9aed08 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:798
3 locks held by syz-executor702/8477:
#0: ffff888021e90460 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x190/0x660 fs/namei.c:3879
#1: ffff888031258488 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:809 [inline]
#1: ffff888031258488 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x27d/0x660 fs/namei.c:3883
#2: ffff88803125a288 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline]
#2: ffff88803125a288 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: vfs_unlink+0xcd/0x600 fs/namei.c:3824
3 locks held by syz-executor702/8478:
#0: ffffffff8c9aec50 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:810
#1: ffffffff8c9aed08 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline]
#1: ffffffff8c9aed08 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:798
#2: ffffffff8c927908 (rtnl_mutex){+.+.}-{3:3}, at: ieee80211_register_hw+0x1782/0x3b60 net/mac80211/main.c:1222
5 locks held by kworker/u4:0/8484:
#0: ffff88801303f938 ((wq_completion)phy3){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88801303f938 ((wq_completion)phy3){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff88801303f938 ((wq_completion)phy3){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff88801303f938 ((wq_completion)phy3){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff88801303f938 ((wq_completion)phy3){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff88801303f938 ((wq_completion)phy3){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc900016ffda8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
#2: ffff888013f78d00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1021 [inline]
#2: ffff888013f78d00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x93/0xe80 net/mac80211/ibss.c:1683
#3: ffff888013921548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_ibss_sta_expire net/mac80211/ibss.c:1262 [inline]
#3: ffff888013921548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_sta_merge_ibss net/mac80211/ibss.c:1305 [inline]
#3: ffff888013921548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x481/0xe80 net/mac80211/ibss.c:1711
#4: ffffffff8b33ffa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#4: ffffffff8b33ffa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f2/0x610 kernel/rcu/tree_exp.h:836
5 locks held by kworker/u4:1/8965:
#0: ffff888027081138 ((wq_completion)phy5){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888027081138 ((wq_completion)phy5){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff888027081138 ((wq_completion)phy5){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff888027081138 ((wq_completion)phy5){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff888027081138 ((wq_completion)phy5){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff888027081138 ((wq_completion)phy5){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc90002eefda8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
#2: ffff888025bd8d00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1021 [inline]
#2: ffff888025bd8d00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_rx_queued_mgmt+0xe9/0x1870 net/mac80211/ibss.c:1631
#3: ffff888014bb9548 (&local->sta_mtx){+.+.}-{3:3}, at: sta_info_destroy_addr+0x48/0xe0 net/mac80211/sta_info.c:1127
#4: ffffffff8b33ffa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
#4: ffffffff8b33ffa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x27e/0x610 kernel/rcu/tree_exp.h:836
3 locks held by syz-executor702/9802:
4 locks held by kworker/u4:4/9815:
#0: ffff88802c99c938 ((wq_completion)phy4){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff88802c99c938 ((wq_completion)phy4){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff88802c99c938 ((wq_completion)phy4){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff88802c99c938 ((wq_completion)phy4){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff88802c99c938 ((wq_completion)phy4){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff88802c99c938 ((wq_completion)phy4){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc9000a91fda8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
#2: ffff88801459cd00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1021 [inline]
#2: ffff88801459cd00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x93/0xe80 net/mac80211/ibss.c:1683
#3: ffff888013f71548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_ibss_sta_expire net/mac80211/ibss.c:1262 [inline]
#3: ffff888013f71548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_sta_merge_ibss net/mac80211/ibss.c:1305 [inline]
#3: ffff888013f71548 (&local->sta_mtx){+.+.}-{3:3}, at: ieee80211_ibss_work+0x481/0xe80 net/mac80211/ibss.c:1711
4 locks held by kworker/u4:5/9825:
#0: ffff888026e79138 ((wq_completion)phy7){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888026e79138 ((wq_completion)phy7){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff888026e79138 ((wq_completion)phy7){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff888026e79138 ((wq_completion)phy7){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff888026e79138 ((wq_completion)phy7){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff888026e79138 ((wq_completion)phy7){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243
#1: ffffc9000aa0fda8 ((work_completion)(&sdata->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247
#2: ffff8880275acd00 (&wdev->mtx){+.+.}-{3:3}, at: sdata_lock net/mac80211/ieee80211_i.h:1021 [inline]
#2: ffff8880275acd00 (&wdev->mtx){+.+.}-{3:3}, at: ieee80211_ibss_rx_queued_mgmt+0xe9/0x1870 net/mac80211/ibss.c:1631
#3: ffff888017fc9548 (&local->sta_mtx){+.+.}-{3:3}, at: sta_info_destroy_addr+0x48/0xe0 net/mac80211/sta_info.c:1127

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

NMI backtrace for cpu 0
CPU: 0 PID: 1657 Comm: khungtaskd Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
watchdog+0xd43/0xfa0 kernel/hung_task.c:294
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9802 Comm: syz-executor702 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x19/0x60 kernel/kcov.c:197
Code: 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 65 48 8b 14 25 00 f0 01 00 65 8b 05 40 eb 91 7e a9 00 01 ff 00 48 8b 34 24 <74> 0f f6 c4 01 74 35 8b 82 5c 14 00 00 85 c0 74 2b 8b 82 38 14 00
RSP: 0018:ffffc90000d90028 EFLAGS: 00000006
RAX: 0000000000010101 RBX: ffffc90000d90120 RCX: ffffffff818ed219
RDX: ffff8880328ccec0 RSI: ffffffff818ed227 RDI: 0000000000000007
RBP: ffffc90000d90280 R08: 0000000000000000 R09: ffffffff8ebaf667
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888032b13000 R14: 0000000000000000 R15: ffffc90000d90120
FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5ba2697710 CR3: 0000000012582000 CR4: 0000000000350ee0
Call Trace:
<IRQ>
perf_prepare_sample+0x817/0x1d40 kernel/events/core.c:7136
__perf_event_output kernel/events/core.c:7191 [inline]
perf_event_output_forward+0xf3/0x270 kernel/events/core.c:7211
__perf_event_overflow+0x13c/0x370 kernel/events/core.c:8867
perf_swevent_hrtimer+0x37c/0x3f0 kernel/events/core.c:10267
__run_hrtimer kernel/time/hrtimer.c:1519 [inline]
__hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
__sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:lock_release+0x3d5/0x710 kernel/locking/lockdep.c:5445
Code: 15 02 00 00 48 c7 c7 40 5f 4b 89 e8 c5 6b 8f 07 b8 ff ff ff ff 65 0f c1 05 58 d8 ab 7e 83 f8 01 0f 85 67 01 00 00 ff 34 24 9d <48> b8 00 00 00 00 00 fc ff df 48 01 c5 48 c7 45 00 00 00 00 00 c7
RSP: 0018:ffffc90000d906d0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 02e61d1879d3e8c2 RCX: ffffc90000d90720
RDX: 1ffff11006519af9 RSI: 0000000000000101 RDI: 0000000000000000
RBP: 1ffff920001b20dc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000002 R14: ffff8880328cd7d0 R15: ffff8880328ccec0
rcu_lock_release include/linux/rcupdate.h:253 [inline]
rcu_read_unlock include/linux/rcupdate.h:695 [inline]
is_bpf_text_address+0xcb/0x160 kernel/bpf/core.c:710
kernel_text_address kernel/extable.c:151 [inline]
kernel_text_address+0xbd/0xf0 kernel/extable.c:120
__kernel_text_address+0x9/0x30 kernel/extable.c:105
unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline]
unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313
arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461
slab_post_alloc_hook mm/slab.h:535 [inline]
slab_alloc_node mm/slub.c:2891 [inline]
__kmalloc_node_track_caller+0x1e0/0x3e0 mm/slub.c:4495
__kmalloc_reserve net/core/skbuff.c:142 [inline]
__alloc_skb+0xae/0x550 net/core/skbuff.c:210
alloc_skb include/linux/skbuff.h:1094 [inline]
ndisc_alloc_skb+0x134/0x320 net/ipv6/ndisc.c:420
ndisc_send_rs+0x388/0x700 net/ipv6/ndisc.c:686
addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3873
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410
expire_timers kernel/time/timer.c:1455 [inline]
__run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747
__run_timers kernel/time/timer.c:1728 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
__do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
asm_call_irq_on_stack+0xf/0x20
</IRQ>
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:393 [inline]
__irq_exit_rcu kernel/softirq.c:423 [inline]
irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:schedule_debug kernel/sched/core.c:4278 [inline]
RIP: 0010:__schedule+0x12c/0x2130 kernel/sched/core.c:4423
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7d 1a 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b 45 18 48 89 c1 48 c1 e9 03 80 3c 11 00 <0f> 85 43 1a 00 00 48 81 38 9d 6e ac 57 0f 85 c5 1f 00 00 49 8d 45
RSP: 0018:ffffc9000a94f8e0 EFLAGS: 00000246
RAX: ffffc9000a948000 RBX: 0000000000000001 RCX: 1ffff92001529000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880328cced8
RBP: ffffc9000a94f9a8 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9f34940
R13: ffff8880328ccec0 R14: ffff8880b9f34940 R15: 0000000000034940
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789
irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:get_freepointer mm/slub.c:278 [inline]
RIP: 0010:slab_free_freelist_hook+0x8b/0x150 mm/slub.c:1562
Code: 8b 43 28 49 8b 55 00 48 89 54 05 00 48 8b 04 24 49 89 6d 00 48 83 38 00 0f 84 8d 00 00 00 4c 39 f5 0f 84 90 00 00 00 8b 43 28 <4c> 89 e5 4d 8b 24 04 0f 1f 44 00 00 9c 41 5f fa 41 f7 c7 00 02 00
RSP: 0018:ffffc9000a94fa80 EFLAGS: 00000246
RAX: 0000000000000038 RBX: ffff888010f21500 RCX: ffffffff8130c470
RDX: ffffc9000a94fac8 RSI: ffffc9000a94fac0 RDI: ffff888010f21500
RBP: ffff888010f21500 R08: 0000000000000001 R09: ffff888031f4f13f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880211a8000
R13: ffffc9000a94fac0 R14: ffff8880211a8000 R15: ffffffff8b460f60
slab_free mm/slub.c:3142 [inline]
kmem_cache_free+0x82/0x350 mm/slub.c:3158
free_mm_slot mm/khugepaged.c:414 [inline]
__khugepaged_exit+0x2b8/0x3f0 mm/khugepaged.c:531
khugepaged_exit include/linux/khugepaged.h:52 [inline]
__mmput+0x389/0x470 kernel/fork.c:1078
mmput+0x53/0x60 kernel/fork.c:1100
exit_mm kernel/exit.c:486 [inline]
do_exit+0xa72/0x29b0 kernel/exit.c:796
do_group_exit+0x125/0x310 kernel/exit.c:906
get_signal+0x42a/0x1f10 kernel/signal.c:2758
arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44a3e9
Code: Unable to access opcode bytes at RIP 0x44a3bf.
RSP: 002b:00007fa491ecadb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006e0c38 RCX: 000000000044a3e9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006e0c38
RBP: 00000000006e0c30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e0c3c
R13: 00007fffc6dec0df R14: 00007fa491ecb9c0 R15: 0000000000000005
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.207 msecs

---
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