rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P14108/1:b..l P20356/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=128785, q=264 ncpus=2)
task:syz.0.4001 state:R running task stack:27952 pid:20356 tgid:20337 ppid:16498 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6924
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1676 [inline]
zap_pmd_range mm/memory.c:1724 [inline]
zap_pud_range mm/memory.c:1753 [inline]
zap_p4d_range mm/memory.c:1774 [inline]
unmap_page_range+0xbc7/0x3f20 mm/memory.c:1795
unmap_single_vma+0x194/0x2b0 mm/memory.c:1841
unmap_vmas+0x22f/0x490 mm/memory.c:1885
exit_mmap+0x1b8/0xb20 mm/mmap.c:3341
__mmput+0x12a/0x4d0 kernel/fork.c:1346
mmput+0x62/0x70 kernel/fork.c:1368
exit_mm kernel/exit.c:565 [inline]
do_exit+0x9b7/0x2ba0 kernel/exit.c:861
do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
get_signal+0x2616/0x2710 kernel/signal.c:2909
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9af2575b99
RSP: 002b:00007f9af32f60f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f9af2704080 RCX: 00007f9af2575b99
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9af2704080
RBP: 00007f9af2704078 R08: 00007f9af32f66c0 R09: 00007f9af32f66c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9af2704084
R13: 000000000000006e R14: 00007ffd39286df0 R15: 00007ffd39286ed8
task:syz-executor state:R running task stack:23744 pid:14108 tgid:14108 ppid:14074 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067
irqentry_exit+0x36/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5722
Code: c1 05 9a ad 96 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc900036379b0 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff920006c6f38 RCX: 00000000748d1e62
RDX: 0000000000000001 RSI: ffffffff8b2cb1e0 RDI: ffffffff8b8ff7c0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff284ce58
R10: ffffffff942672c7 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8dbb1620 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
ext4_get_group_desc+0x148/0x570 fs/ext4/balloc.c:288
ext4_read_inode_bitmap+0x4f/0x1680 fs/ext4/ialloc.c:132
ext4_free_inode+0x5a1/0x1470 fs/ext4/ialloc.c:287
ext4_evict_inode+0xcd1/0x17d0 fs/ext4/inode.c:303
evict+0x2ed/0x6c0 fs/inode.c:667
iput_final fs/inode.c:1741 [inline]
iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
iput+0x5c/0x80 fs/inode.c:1757
d_delete_notify include/linux/fsnotify.h:326 [inline]
vfs_rmdir fs/namei.c:4227 [inline]
vfs_rmdir+0x487/0x690 fs/namei.c:4191
do_rmdir+0x3a2/0x410 fs/namei.c:4273
__do_sys_unlinkat fs/namei.c:4449 [inline]
__se_sys_unlinkat fs/namei.c:4443 [inline]
__x64_sys_unlinkat+0xf3/0x130 fs/namei.c:4443
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fab11575217
RSP: 002b:00007ffc01a73ad8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fab11575217
RDX: 0000000000000200 RSI: 00007ffc01a74c40 RDI: 00000000ffffff9c
RBP: 00007fab115e364a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000207 R12: 00007ffc01a74c40
R13: 00007fab115e364a R14: 000000000010bf90 R15: 00007ffc01a74c80
rcu: rcu_preempt kthread starved for 10514 jiffies! g128785 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:27680 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6837
schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 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 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112