------------[ cut here ]------------
WARNING: CPU: 1 PID: 7028 at kernel/rcu/tree_stall.h:1001 rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:993
Modules linked in:
CPU: 1 PID: 7028 Comm: syz.1.322 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:rcu_check_gp_start_stall+0x2dc/0x460 kernel/rcu/tree_stall.h:1001
Code: ff ff ff 48 c7 c7 a0 04 ef 96 be 04 00 00 00 e8 9a ba 6c 00 48 89 df b8 01 00 00 00 87 05 7c d9 7e 15 85 c0 0f 85 19 ff ff ff <0f> 0b 48 81 ff 80 51 d3 8c 74 47 48 c7 c0 1c ba 4a 8e 48 c1 e8 03
RSP: 0018:ffffc900001f0bb8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffffff8cd35180 RCX: ffffffff81702b16
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff8cd35180
RBP: ffffc900001f0e30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff2dde094 R12: 0000000000002904
R13: 1ffff110171e7a22 R14: 0000000000000a02 R15: dffffc0000000000
FS:  00007f15f83e36c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000001b70b000 CR4: 00000000003506e0
Call Trace:
 <IRQ>
 rcu_core+0x612/0x1720 kernel/rcu/tree.c:2462
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:kasan_get_alloc_meta mm/kasan/generic.c:434 [inline]
RIP: 0010:kasan_save_alloc_info+0x0/0x30 mm/kasan/generic.c:509
Code: ff 48 89 c3 e8 91 da ff ff 89 43 08 5b 41 5e 41 5f c3 0f 1f 84 00 00 00 00 00 66 0f 1f 00 31 f6 e9 35 ff ff ff 0f 1f 44 00 00 <66> 0f 1f 00 48 63 87 bc 00 00 00 48 85 c0 0f 94 c1 48 01 c6 0f 94
RSP: 0018:ffffc9000457f9d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88801df5a2a0 RCX: 0000000000000000
RDX: 0000000000000dc0 RSI: ffff88801df5a2a0 RDI: ffff88814007f280
RBP: 0000000000000dc0 R08: 0000000000000004 R09: 0000000000000004
R10: ffffed1003beb454 R11: fffffbfff1c950ae R12: 0000000000000001
R13: 0000000000000110 R14: ffff88814007f280 R15: 0000000000000001
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 locks_alloc_lock fs/locks.c:271 [inline]
 flock_lock_inode+0x226/0x17e0 fs/locks.c:1039
 flock_lock_inode_wait fs/locks.c:2018 [inline]
 locks_lock_inode_wait+0x10d/0x460 fs/locks.c:2045
 locks_lock_file_wait include/linux/filelock.h:346 [inline]
 __do_sys_flock fs/locks.c:2115 [inline]
 __se_sys_flock+0x46d/0x5a0 fs/locks.c:2069
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f15f758efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f15f83e3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000049
RAX: ffffffffffffffda RBX: 00007f15f77e5fa0 RCX: 00007f15f758efc9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00007f15f7611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f15f77e6038 R14: 00007f15f77e5fa0 R15: 00007ffd531e3d08
 </TASK>
----------------
Code disassembly (best guess):
   0:	ff 48 89             	decl   -0x77(%rax)
   3:	c3                   	ret
   4:	e8 91 da ff ff       	call   0xffffda9a
   9:	89 43 08             	mov    %eax,0x8(%rbx)
   c:	5b                   	pop    %rbx
   d:	41 5e                	pop    %r14
   f:	41 5f                	pop    %r15
  11:	c3                   	ret
  12:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
  19:	00
  1a:	66 0f 1f 00          	nopw   (%rax)
  1e:	31 f6                	xor    %esi,%esi
  20:	e9 35 ff ff ff       	jmp    0xffffff5a
  25:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
* 2a:	66 0f 1f 00          	nopw   (%rax) <-- trapping instruction
  2e:	48 63 87 bc 00 00 00 	movslq 0xbc(%rdi),%rax
  35:	48 85 c0             	test   %rax,%rax
  38:	0f 94 c1             	sete   %cl
  3b:	48 01 c6             	add    %rax,%rsi
  3e:	0f                   	.byte 0xf
  3f:	94                   	xchg   %eax,%esp