rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=b0e/1/0x4000000000000000 softirq=148023/148023 fqs=1
(detected by 0, t=10002 jiffies, g=234653, q=50)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1669 Comm: syz-executor.4 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:get_ctx kernel/kcsan/core.c:193 [inline]
RIP: 0010:check_access kernel/kcsan/core.c:601 [inline]
RIP: 0010:__tsan_unaligned_write4+0xe2/0x190 kernel/kcsan/core.c:800
Code: 72 28 4c 89 c1 48 c1 e9 31 81 e1 ff 3f 00 00 49 8d 4c 0a ff 48 39 d1 72 11 48 8d 0c c5 f0 e4 51 89 48 85 c9 0f 85 85 00 00 00 <65> 8b 05 a3 30 a9 7e a9 00 01 ff 00 74 17 48 c7 c0 70 86 02 00 65
RSP: 0000:ffffc90000d08e68 EFLAGS: 00000093
RAX: 000000000000001e RBX: ffff88812c11ec90 RCX: 0000000000000000
RDX: 000088812c11ec90 RSI: ffff88812c11ec80 RDI: ffff88812c11ec90
RBP: 0000000012bce4c5 R08: 0000000000000000 R09: 000088812c11ec93
R10: 0000ffffffffffff R11: 0000000000000000 R12: ffff88812c11ec00
R13: ffff88812c11ec80 R14: ffff88812c11ec80 R15: ffff88812c11ec00
FS: 0000000001e49940(0000) GS:ffff88812c100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001190000 CR3: 000000006cb9e000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
raw_write_seqcount_t_barrier include/linux/seqlock.h:565 [inline]
__run_hrtimer+0x60/0x4b0 kernel/time/hrtimer.c:1502
__hrtimer_run_queues kernel/time/hrtimer.c:1588 [inline]
hrtimer_interrupt+0x37c/0xa40 kernel/time/hrtimer.c:1650
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
__sysvec_apic_timer_interrupt+0xa3/0x280 arch/x86/kernel/apic/apic.c:1097
asm_call_irq_on_stack+0xf/0x20
</IRQ>
__run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
sysvec_apic_timer_interrupt+0x80/0xd0 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
RIP: 0010:kcsan_setup_watchpoint+0x44b/0x4a0 kernel/kcsan/core.c:563
Code: 24 20 48 c7 00 00 00 00 00 31 ff e8 ff 00 00 00 80 3d 2a 7e f9 07 00 75 16 48 83 3d f6 16 6e 06 00 74 4c 48 8b 7c 24 30 57 9d <0f> 1f 44 00 00 4c 89 64 24 40 eb 05 ff 74 24 40 9d 48 83 c4 50 5b
RSP: 0000:ffffc90006483d18 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0010ffff87c67ee0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000ffffffffffff R11: 0000000000000000 R12: 0000000000000014
R13: 0000000000000008 R14: ffffffff87c67ee0 R15: 0000000000000028
pud_val arch/x86/include/asm/paravirt.h:524 [inline]
pud_page_vaddr arch/x86/include/asm/pgtable.h:871 [inline]
pmd_offset include/linux/pgtable.h:91 [inline]
pmd_alloc include/linux/mm.h:2119 [inline]
__handle_mm_fault mm/memory.c:4497 [inline]
handle_mm_fault+0x678/0x1af0 mm/memory.c:4633
do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1372
handle_page_fault arch/x86/mm/fault.c:1429 [inline]
exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1482
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538
RIP: 0033:0x41056e
Code: 0f 1f 40 00 48 c7 44 24 10 00 00 00 00 c7 44 24 0c 00 00 00 00 48 8b ac 24 88 00 00 00 48 81 fd 00 00 59 01 0f 83 48 06 00 00 <4c> 8b 75 00 4c 8d 65 08 4c 89 a4 24 88 00 00 00 49 83 fe ff 0f 84
RSP: 002b:00007fff3547ed40 EFLAGS: 00010287
RAX: 00007f24e6b07000 RBX: 0000000000000000 RCX: 0000000000156878
RDX: 0000000000000256 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000001190000 R08: 0000000000000000 R09: 0000000000000004
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff3547ef30 R14: 0000000000000000 R15: 00007fff3547ef40
rcu: rcu_preempt kthread starved for 9999 jiffies! g234653 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:14568 pid: 10 ppid: 2 flags:0x10004000
Call Trace:
context_switch kernel/sched/core.c:3778 [inline]
__schedule+0x3bd/0x590 kernel/sched/core.c:4527