rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 2-...!: (0 ticks this GP) idle=552c/1/0x4000000000000000 softirq=12111/12111 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-7): P5828/1:b..l..
rcu: (detected by 1, t=10502 jiffies, g=7437, q=1261 ncpus=4)
Sending NMI from CPU 1 to CPUs 2:
NMI backtrace for cpu 2
CPU: 2 UID: 0 PID: 5769 Comm: sshd-session Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xa/0x20 kernel/kcov.c:328
Code: 00 00 00 e9 38 fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 0c 24 89 f2 <89> fe bf 05 00 00 00 e9 0a fe ff ff 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0000:ffffc9000161fd10 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff888029840300 RCX: ffffffff89f1fb85
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000001 R09: fffff520002c3f95
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888029840300
R13: ffff88806a228a80 R14: ffffffff89f1fa90 R15: ffff88806a228840
FS: 00007f7ae3f67300(0000) GS:ffff8880d467d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7666df62f8 CR3: 00000000258bd000 CR4: 0000000000352ef0
Call Trace:
advance_sched+0xf5/0xd20 net/sched/sch_taprio.c:939
__run_hrtimer kernel/time/hrtimer.c:2079 [inline]
__hrtimer_run_queues+0x448/0x9a0 kernel/time/hrtimer.c:2136
hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2255
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0033:0x7f7ae405b3a0
Code: 06 00 00 ff ff ff ff f0 83 88 08 03 00 00 10 64 48 8b 3c 25 00 03 00 00 e8 4d b1 00 00 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <53> 49 89 ca 64 48 8b 1c 25 10 00 00 00 8b 83 08 03 00 00 80 3d 66
RSP: 002b:00007ffcfafde838 EFLAGS: 00000206
RAX: 00007ffcfafde870 RBX: 000055776f1ee360 RCX: 00007ffcfafde970
RDX: 00007ffcfafde870 RSI: 0000000000000007 RDI: 000055776f1f9ce0
RBP: 00007ffcfafde8e0 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000003ce0 R11: 0000000000000001 R12: 0000000000000001
R13: 00007ffcfafde970 R14: 0000000000000051 R15: 0000000000000004
task:kworker/u32:2 state:R running task stack:25000 pid:5828 tgid:5828 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7662
irqentry_exit_cond_resched arch/x86/include/asm/fred.h:105 [inline]
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:453 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x33f/0xab0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5947
Code: 05 0f 01 d1 13 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 1e 69 81 10 0f 82 c9 02 00 00 8b 35 fe 98 81 10 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 ad 00 d1 13 0f 85 09 03 00 00 48 83 c4
RSP: 0018:ffffc900036c7780 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000200
RDX: 0000000000000000 RSI: ffffffff8e601094 RDI: ffffffff8c835380
RBP: ffffffff8ffeb260 R08: 00000000ba61d691 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
kernfs_root+0x34/0x2a0 fs/kernfs/kernfs-internal.h:76
__kernfs_remove+0x177/0xbc0 fs/kernfs/dir.c:1557
kernfs_remove_by_name_ns+0x7c/0x120 fs/kernfs/dir.c:1796
kernfs_remove_by_name include/linux/kernfs.h:644 [inline]
remove_files+0x96/0x1c0 fs/sysfs/group.c:28
sysfs_remove_group+0x8b/0x1b0 fs/sysfs/group.c:328
sysfs_remove_groups fs/sysfs/group.c:352 [inline]
sysfs_remove_groups+0x60/0xb0 fs/sysfs/group.c:344
destroy_gid_attrs drivers/infiniband/core/sysfs.c:1143 [inline]
ib_free_port_attrs+0x10a/0x480 drivers/infiniband/core/sysfs.c:1367
remove_one_compat_dev drivers/infiniband/core/device.c:1035 [inline]
rdma_dev_exit_net+0x2fd/0x6b0 drivers/infiniband/core/device.c:1173
ops_exit_list net/core/net_namespace.c:200 [inline]
ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:253
cleanup_net+0x499/0x920 net/core/net_namespace.c:708
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3495
process_scheduled_works kernel/workqueue.c:3578 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3659
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread starved for 10518 jiffies! g7437 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:28552 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5583 [inline]
__schedule+0x125e/0x6990 kernel/sched/core.c:7382
__schedule_loop kernel/sched/core.c:7459 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7474
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x930 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x179/0x260 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 48 Comm: kcompactd0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline]
RIP: 0010:smp_call_function_many_cond+0x8f0/0x18c0 kernel/smp.c:1028
Code: 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 08 49 89 ce 83 e1 07 49 c1 ee 03 49 89 cd 49 01 c6 41 83 c5 03 e8 02 dc 0c 00 f3 90 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 ca 0d 00 00 8b 45 08 31 ff
RSP: 0018:ffffc90000a1f150 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000000000000001
RDX: ffff88801e7b4b00 RSI: ffffffff820169de RDI: 0000000000000005
RBP: ffff88806a2447a0 R08: 0000000000000000 R09: 0000000000000001
R10: ffff88806a1241c7 R11: 0000000000000000 R12: ffffed1003cf6c13
R13: 0000000000000003 R14: ffffed100d4488f5 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8880d457d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c4503a3 CR3: 0000000026fe1000 CR4: 0000000000352ef0
Call Trace:
kvm_flush_tlb_multi+0x238/0x3b0 arch/x86/kernel/kvm.c:716
__flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
arch_tlbbatch_flush+0x1c9/0x3f0 arch/x86/mm/tlb.c:1710
try_to_unmap_flush+0x6f/0xf0 mm/rmap.c:720
migrate_pages_batch+0x2140/0x4700 mm/migrate.c:1995
migrate_pages_sync+0x12c/0x880 mm/migrate.c:2034
migrate_pages+0x1a79/0x2840 mm/migrate.c:2143
compact_zone+0x263e/0x4630 mm/compaction.c:2698
compact_node+0x17f/0x2c0 mm/compaction.c:2945
kcompactd+0x6df/0xd20 mm/compaction.c:3242
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245