syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10360/1:b..l P10355/1:b..l
	(detected by 1, t=10502 jiffies, g=57893, q=341 ncpus=2)
task:modprobe        state:R  running task     stack:23880 pid:10355 ppid:4595   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:lock_is_held_type+0x0/0x180 kernel/locking/lockdep.c:5690
Code: 00 75 d6 48 c7 c7 00 01 0c 8b 48 c7 c6 40 01 0c 8b e8 e4 73 ad f6 0f 0b eb bf e8 ab fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 <55> 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00
RSP: 0018:ffffc9000344f538 EFLAGS: 00000246
RAX: 1ffff1100fa30e10 RBX: 0000000000000300 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88807d1871d8
RBP: ffffc9000344f730 R08: ffffffff8a9c2b1e R09: ffffffff8a9c2c0b
R10: 0000000000000003 R11: ffff88801ee93b80 R12: 1ffff92000689ec7
R13: ffffc9000344f638 R14: ffff88807d1871d8 R15: 0000000000000000
 mt_slot lib/maple_tree.c:814 [inline]
 mas_slot lib/maple_tree.c:847 [inline]
 mt_validate_nulls lib/maple_tree.c:7187 [inline]
 mt_validate+0x507c/0x5ad0 lib/maple_tree.c:7243
 validate_mm_mt+0x165/0x670 mm/mmap.c:295
 validate_mm+0x16e/0x380 mm/mmap.c:332
 __vma_adjust+0x1d41/0x1f40 mm/mmap.c:871
 __split_vma+0x36e/0x530
 mprotect_fixup+0x753/0x840 mm/mprotect.c:623
 do_mprotect_pkey+0x8b6/0xbe0 mm/mprotect.c:792
 __do_sys_mprotect mm/mprotect.c:819 [inline]
 __se_sys_mprotect mm/mprotect.c:816 [inline]
 __x64_sys_mprotect+0x7c/0x90 mm/mprotect.c:816
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efdf39efbb7
RSP: 002b:00007ffe9b9908b8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007efdf39d3570 RCX: 00007efdf39efbb7
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007efdf3725000
RBP: 00007ffe9b9909d0 R08: 00007ffe9b990848 R09: 00007efdf39d25c0
R10: 00007efdf36d2928 R11: 0000000000000206 R12: 00007efdf39d3570
R13: 00007efdf39f7eda R14: 00007efdf3725fb0 R15: 00007efdf3725e58
 </TASK>
task:modprobe        state:R  running task     stack:23880 pid:10360 ppid:3748   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x7c/0x80 kernel/kcov.c:306
Code: 8d 42 28 4c 39 c8 77 22 89 f8 89 f6 49 ff c2 4c 89 11 48 c7 44 0a 08 05 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 <c3> 0f 1f 00 4c 8b 04 24 65 48 8b 0d b4 ca 77 7e 65 8b 05 b5 ca 77
RSP: 0018:ffffc900030ef788 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888021719dc0
RDX: ffff888021719dc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880229b16c0 R08: ffffffff81f3ad1a R09: fffff5200061df76
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880229b16c2
R13: ffffffff8d1d5520 R14: 0000000000000081 R15: dffffc0000000000
 devcgroup_inode_permission include/linux/device_cgroup.h:21 [inline]
 inode_permission+0xea/0x450 fs/namei.c:532
 may_lookup fs/namei.c:1716 [inline]
 link_path_walk+0x283/0xee0 fs/namei.c:2267
 path_openat+0x23d/0x2e60 fs/namei.c:3781
 do_filp_open+0x230/0x480 fs/namei.c:3812
 do_sys_openat2+0x13b/0x4f0 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f72b1f48a46
RSP: 002b:00007ffe3314e5c8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffe3314e828 RCX: 00007f72b1f48a46
RDX: 0000000000080000 RSI: 00007ffe3314e640 RDI: 00000000ffffff9c
RBP: 00007ffe3314e630 R08: 0000000000080000 R09: 00007ffe3314e640
R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffe3314e640
R13: 0000000000000008 R14: 00007ffe3314e80f R15: 00000000ffffffff
 </TASK>
rcu: rcu_preempt kthread starved for 10073 jiffies! g57893 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:26752 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
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:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567