rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10883/1:b..l P10881/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=66213, q=421 ncpus=2)
task:syz-executor.3 state:R running task stack:25808 pid:10881 tgid:10879 ppid:10575 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6746
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6925
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.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:1674 [inline]
zap_pmd_range mm/memory.c:1722 [inline]
zap_pud_range mm/memory.c:1751 [inline]
zap_p4d_range mm/memory.c:1772 [inline]
unmap_page_range+0x1c37/0x3c10 mm/memory.c:1793
unmap_single_vma+0x194/0x2b0 mm/memory.c:1839
unmap_vmas+0x22f/0x490 mm/memory.c:1883
exit_mmap+0x1c1/0xb90 mm/mmap.c:3267
__mmput+0x12a/0x4d0 kernel/fork.c:1346
mmput+0x62/0x70 kernel/fork.c:1368
exit_mm kernel/exit.c:569 [inline]
do_exit+0x999/0x2c10 kernel/exit.c:865
do_group_exit+0xd3/0x2a0 kernel/exit.c:1027
get_signal+0x2616/0x2710 kernel/signal.c:2911
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+0xdc/0x260 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f905c27dca9
RSP: 002b:00007f905d07e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000136
RAX: 00000000007ffb80 RBX: 00007f905c3abf80 RCX: 00007f905c27dca9
RDX: 0000000000000002 RSI: 0000000020008400 RDI: 000000000000000d
RBP: 00007f905c2c947e R08: 0000000000000286 R09: 0000000000000000
R10: 0000000020008640 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f905c3abf80 R15: 00007ffe010a2d08
task:syz-executor.2 state:R running task stack:25904 pid:10883 tgid:10882 ppid:9159 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6746
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7068
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 0a 93 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:ffffc9000323f4a8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000647e97 RCX: 00000000c62827c2
RDX: 0000000000000001 RSI: ffffffff8b0cb100 RDI: ffffffff8b6f57a0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff27bba30
R10: ffffffff93ddd187 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8d7b0e20 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
__pte_offset_map+0x48/0x540 mm/pgtable-generic.c:285
pte_offset_map_nolock+0x84/0x1c0 mm/pgtable-generic.c:312
handle_pte_fault mm/memory.c:5286 [inline]
__handle_mm_fault+0xbc6/0x4a80 mm/memory.c:5441
handle_mm_fault+0x476/0xa00 mm/memory.c:5606
do_user_addr_fault+0x2e5/0x1030 arch/x86/mm/fault.c:1382
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71
Code: 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 a4 c3 cc cc cc cc 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1
RSP: 0018:ffffc9000323f958 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000001000 RCX: 0000000000000e80
RDX: 0000000000000000 RSI: ffff8880129e4180 RDI: 00000000207e3000
RBP: 0000000000001000 R08: 0000000000000000 R09: ffffed100253c9ff
R10: ffff8880129e4fff R11: 0000000000000000 R12: 00000000007e2b80
R13: ffffc9000323fd50 R14: ffff8880129e4000 R15: 00000000207e2e80
copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
copy_to_user_iter lib/iov_iter.c:25 [inline]
iterate_iovec include/linux/iov_iter.h:51 [inline]
iterate_and_advance2 include/linux/iov_iter.h:247 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
_copy_to_iter+0x4d2/0x1140 lib/iov_iter.c:185
copy_page_to_iter lib/iov_iter.c:362 [inline]
copy_page_to_iter+0xf1/0x180 lib/iov_iter.c:349
process_vm_rw_pages mm/process_vm_access.c:45 [inline]
process_vm_rw_single_vec mm/process_vm_access.c:118 [inline]
process_vm_rw_core.constprop.0+0x5c9/0xa10 mm/process_vm_access.c:216
process_vm_rw+0x301/0x360 mm/process_vm_access.c:284
__do_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
__se_sys_process_vm_readv mm/process_vm_access.c:292 [inline]
__x64_sys_process_vm_readv+0xe2/0x1c0 mm/process_vm_access.c:292
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f184ee7dca9
RSP: 002b:00007f184fc9c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000136
RAX: ffffffffffffffda RBX: 00007f184efabf80 RCX: 00007f184ee7dca9
RDX: 0000000000000002 RSI: 0000000020008400 RDI: 00000000000000f3
RBP: 00007f184eec947e R08: 0000000000000286 R09: 0000000000000000
R10: 0000000020008640 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f184efabf80 R15: 00007fff30c08e98
rcu: rcu_preempt kthread starved for 10562 jiffies! g66213 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:27296 pid:16 tgid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6746
__schedule_loop kernel/sched/core.c:6823 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6838
schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2582
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1663
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1862
kthread+0x2c1/0x3a0 kernel/kthread.c:388
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 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:86 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112