rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=f504/0/0x1 softirq=18140/18140 fqs=0
	(t=10501 jiffies g=21793 q=28 ncpus=2)
rcu: rcu_preempt kthread starved for 10502 jiffies! g21793 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27888 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6309 Comm: syz.2.643 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:unwind_next_frame+0x715/0x1fd0 arch/x86/kernel/unwind_orc.c:-1
Code: 0f b6 04 2a 84 c0 0f 85 8a 12 00 00 41 0f b6 45 01 83 e0 03 ff 24 c5 d0 86 89 8a 48 89 54 24 18 4c 89 74 24 50 4c 89 7c 24 08 <4c> 89 64 24 20 48 8d 7b 08 49 89 ff 49 c1 ef 03 41 80 3c 2f 00 74
RSP: 0018:ffffc90004237560 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90004237608 RCX: ffffffff8e36e930
RDX: 1ffffffff1d53f69 RSI: ffffffff8e36e928 RDI: ffffffff8138fb37
RBP: dffffc0000000000 R08: 000000000000000e R09: 0000000000000003
R10: dffffc0000000000 R11: fffff52000846ecd R12: ffffffff8ea9fb4a
R13: ffffffff8ea9fb4e R14: ffffffff8ea9fb4f R15: 1ffffffff1d53f69
FS:  00007fabe2b496c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe68d1456b8 CR3: 0000000078ebf000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 kmem_cache_free+0xf7/0x2a0 mm/slub.c:3709
 locks_free_lock fs/locks.c:335 [inline]
 posix_lock_inode+0x25c7/0x32f0 fs/locks.c:1310
 posix_lock_file fs/locks.c:1333 [inline]
 vfs_lock_file fs/locks.c:2311 [inline]
 do_lock_file_wait fs/locks.c:2325 [inline]
 fcntl_setlk+0xaa7/0x10e0 fs/locks.c:2403
 do_fcntl+0x543/0x1280 fs/fcntl.c:355
 __do_sys_fcntl fs/fcntl.c:446 [inline]
 __se_sys_fcntl+0xc9/0x190 fs/fcntl.c:431
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fabe1b9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fabe2b49028 EFLAGS: 00000246 ORIG_RAX: 0000000000000048
RAX: ffffffffffffffda RBX: 00007fabe1e15fa0 RCX: 00007fabe1b9ce59
RDX: 0000200000000280 RSI: 0000000000000026 RDI: 0000000000000005
RBP: 00007fabe1c32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fabe1e16038 R14: 00007fabe1e15fa0 R15: 00007fffeefdd658
 </TASK>
CPU: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:742
Code: 48 89 df e8 47 77 9e f7 e9 44 ff ff ff e8 2d 08 f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 66 90 0f 00 2d 97 d5 51 00 fb f4 <c3> 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffffff8c807d88 EFLAGS: 000002c6
RAX: 68db936eb23d7200 RBX: ffffffff8a34d677 RCX: 68db936eb23d7200
RDX: 0000000000000001 RSI: ffffffff8a8c17a0 RDI: ffffffff8adee1a0
RBP: ffffffff8c807ec0 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8c8bc740 R15: 1ffffffff1900fbc
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cb8bacf168 CR3: 000000005c6fd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 default_idle_call+0x84/0xc0 kernel/sched/idle.c:109
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x250/0x680 kernel/sched/idle.c:323
 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:422
 rest_init+0x2dc/0x300 init/main.c:745
 arch_call_rest_init+0xa/0xa init/main.c:904
 start_kernel+0x493/0x53c init/main.c:1151
 secondary_startup_64_no_verify+0xcf/0xdb
 </TASK>