rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8009/1:b..l P5826/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=29053, q=427 ncpus=2)
task:syz-executor state:R running task stack:20544 pid:5826 tgid:5826 ppid:5820 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x1850/0x4c30 kernel/sched/core.c:6756
preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:7028
preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x7e/0xb0 kernel/rcu/tree.c:738
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0xe3/0x550 kernel/locking/lockdep.c:5820
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
page_ext_get+0x3d/0x2a0 mm/page_ext.c:525
__reset_page_owner+0x30/0x430 mm/page_owner.c:290
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659
discard_slab mm/slub.c:2688 [inline]
__put_partials+0x160/0x1c0 mm/slub.c:3157
put_cpu_partial+0x17c/0x250 mm/slub.c:3232
__slab_free+0x290/0x380 mm/slub.c:4483
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4119 [inline]
slab_alloc_node mm/slub.c:4168 [inline]
kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4175
getname_flags+0xb7/0x540 fs/namei.c:139
getname fs/namei.c:223 [inline]
__do_sys_unlink fs/namei.c:4635 [inline]
__se_sys_unlink fs/namei.c:4633 [inline]
__x64_sys_unlink+0x3a/0x50 fs/namei.c:4633
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: 0033:0x7f27fbf852d7
RSP: 002b:00007ffd11f334c8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f27fbf852d7
RDX: 00007ffd11f334f0 RSI: 00007ffd11f33580 RDI: 00007ffd11f33580
RBP: 00007ffd11f33580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd11f34600
R13: 00007f27fc001894 R14: 00007ffd11f34640 R15: 0000000000000072
task:syz-executor state:R running task stack:20544 pid:8009 tgid:8009 ppid:8000 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x1850/0x4c30 kernel/sched/core.c:6756
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:jhash2 include/linux/jhash.h:129 [inline]
RIP: 0010:hash_stack lib/stackdepot.c:514 [inline]
RIP: 0010:stack_depot_save_flags+0x99/0x940 lib/stackdepot.c:614
Code: 89 f0 4c 8b 44 24 08 4c 89 c2 03 02 03 5a 04 44 03 72 08 44 89 f7 c1 c7 04 44 29 f0 31 c7 41 01 de 29 fb 89 fd c1 c5 06 31 dd <44> 01 f7 89 e9 c1 c1 08 41 29 ee 44 31 f1 01 fd 29 cf 89 c8 c1 c0
RSP: 0018:ffffc900033c7510 EFLAGS: 00000282
RAX: 0000000095a5fc65 RBX: 0000000002c17be9 RCX: 0000000059f263af
RDX: ffffc900033c7614 RSI: 0000000000000009 RDI: 00000000073cf1a9
RBP: 00000000cdfd11a8 R08: ffffc900033c75c0 R09: 000000000000000f
R10: dffffc0000000000 R11: fffffbfff2032f9f R12: dffffc0000000000
R13: 1ffff92000678eb4 R14: 00000000d327fe6e R15: 1ffff11005444830
save_stack+0x109/0x1f0 mm/page_owner.c:157
__reset_page_owner+0x76/0x430 mm/page_owner.c:297
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659
discard_slab mm/slub.c:2688 [inline]
__put_partials+0x160/0x1c0 mm/slub.c:3157
put_cpu_partial+0x17c/0x250 mm/slub.c:3232
__slab_free+0x290/0x380 mm/slub.c:4483
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x23/0xb0 mm/kasan/common.c:385
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4298 [inline]
__kmalloc_noprof+0x285/0x4c0 mm/slub.c:4310
kmalloc_noprof include/linux/slab.h:905 [inline]
tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
tomoyo_mount_acl security/tomoyo/mount.c:105 [inline]
tomoyo_mount_permission+0x3bf/0xb80 security/tomoyo/mount.c:237
security_sb_mount+0xe0/0x2f0 security/security.c:1564
path_mount+0xb9/0xfa0 fs/namespace.c:3776
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
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: 0033:0x7fe3ecf874ca
RSP: 002b:00007ffdd1f3b718 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe3ed001e6b RCX: 00007fe3ecf874ca
RDX: 00007fe3ed00ebc7 RSI: 00007fe3ed001e6b RDI: 00007fe3ed00ebc7
RBP: 00007fe3ed002063 R08: 0000000000000000 R09: 00007fe3ed176738
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe3ecfe41c8
R13: 00007fe3ecfe41a8 R14: 0000000000000009 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10366 jiffies! g29053 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:25880 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x1850/0x4c30 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6848
schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
kthread+0x2f2/0x390 kernel/kthread.c:389
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111