------------[ cut here ]------------
WARNING: CPU: 0 PID: 3200 at kernel/rcu/tree_stall.h:824 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:816
Modules linked in:
CPU: 0 PID: 3200 Comm: kworker/u17:9 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: wg-kex-wg2 wg_packet_handshake_send_worker
RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:824
Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 20 95 e2 8f e8 1e 4f 57 00 b8 01 00 00 00 87 05 e3 3b 82 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd 00 c9 f7 8b 48 c7 c3 0c 5c c5 8d 74 58 48 b8 00 00
RSP: 0018:ffffc90000007e50 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 00000001000050c7 RCX: ffffffff81605932
RDX: fffffbfff1fc52a4 RSI: 0000000000000004 RDI: ffffffff8fe29520
RBP: ffffffff8bf7c900 R08: 0000000000000001 R09: 0000000000000003
R10: fffffbfff1fc52a4 R11: ffffffff8bf7c940 R12: 1ffffffff1781e30
R13: 0000000000000246 R14: ffff88802ca35fd2 R15: ffff88802ca36058
FS:  0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c008627000 CR3: 000000000bc8e000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:787 [inline]
 rcu_core+0x4ec/0x12f0 kernel/rcu/tree.c:2789
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu kernel/softirq.c:422 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:fproduct_carry_wide_ lib/crypto/curve25519-hacl64.c:122 [inline]
RIP: 0010:fsquare_fsquare_ lib/crypto/curve25519-hacl64.c:258 [inline]
RIP: 0010:fsquare_fsquare_times_ lib/crypto/curve25519-hacl64.c:280 [inline]
RIP: 0010:fsquare_fsquare_times lib/crypto/curve25519-hacl64.c:288 [inline]
RIP: 0010:crecip_crecip lib/crypto/curve25519-hacl64.c:324 [inline]
RIP: 0010:crecip lib/crypto/curve25519-hacl64.c:441 [inline]
RIP: 0010:format_scalar_of_point lib/crypto/curve25519-hacl64.c:754 [inline]
RIP: 0010:curve25519_generic+0x265d/0x5550 lib/crypto/curve25519-hacl64.c:782
Code: bf ff ff ff ff ff ff 07 00 48 0f ac d0 33 48 c1 ea 33 48 03 84 24 10 01 00 00 48 13 94 24 18 01 00 00 49 21 c6 48 0f ac d0 33 <48> c1 ea 33 49 01 c4 49 11 d5 4c 89 e0 4c 21 d7 4c 89 a4 24 30 01
RSP: 0018:ffffc9000d7b7520 EFLAGS: 00000a07
RAX: 008ec22316501e0c RBX: 0007ffffffffffff RCX: 0113653294873bf6
RDX: 000004761118b280 RSI: 0158955e3ef61509 RDI: 0007ffffffffffff
RBP: ffffc9000d7b7910 R08: a84aa10fac871346 R09: 00000ac4aaf1f7b0
R10: 9da2db8ef8fd1817 R11: 00000bd58a62338e R12: 18d025ac727a2d0a
R13: 000000c28b66fe50 R14: 000436e24963fce0 R15: 0003e81ede0b8bd2
 curve25519_arch+0x1f7/0x230 arch/x86/crypto/curve25519-x86_64.c:1390