rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6725/1:b..l..
rcu: (detected by 0, t=10502 jiffies, g=22281, q=477 ncpus=2)
task:syz.2.235 state:R running task stack:25352 pid:6725 tgid:6723 ppid:5611 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5584 [inline]
__schedule+0x1768/0x5780 kernel/sched/core.c:7389
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7669
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:543 [inline]
irqentry_exit+0x14f/0x9b0 kernel/entry/common.c:154
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:unwind_next_frame+0x46e/0x2550 arch/x86/kernel/unwind_orc.c:520
Code: d1 48 89 15 74 f4 5c 12 48 85 d2 0f 84 2e 02 00 00 48 8d 5a 04 48 89 54 24 18 4c 8d 6a 05 48 89 d8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 b4 19 00 00 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0
RSP: 0018:ffffc9000e0675a0 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffffff9177fe68 RCX: ffffffff90f8be84
RDX: ffffffff9177fe64 RSI: ffffffff9177fe64 RDI: ffffffff8bed3020
RBP: ffffffff8254ed0c R08: 0000000000000002 R09: 0000000000000000
R10: ffffc9000e067698 R11: ffffffff81b27080 R12: dffffc0000000000
R13: ffffffff9177fe69 R14: ffffc9000e067648 R15: ffffffff90f8be80
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:351 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:5033 [inline]
kmem_cache_alloc_noprof+0x35b/0x680 mm/slub.c:5047
lsm_inode_alloc security/security.c:255 [inline]
security_inode_alloc+0x39/0x310 security/security.c:1229
inode_init_always_gfp+0x983/0xd40 fs/inode.c:298
inode_init_always include/linux/fs.h:2974 [inline]
alloc_inode+0x82/0x1b0 fs/inode.c:345
new_inode+0x1f/0x170 fs/inode.c:1181
rpc_get_inode net/sunrpc/rpc_pipe.c:470 [inline]
rpc_new_dir+0x8f/0x370 net/sunrpc/rpc_pipe.c:563
rpc_populate+0xab/0x1c0 net/sunrpc/rpc_pipe.c:600
rpc_fill_super+0x229/0x420 net/sunrpc/rpc_pipe.c:1136
get_tree_super fs/super.c:1360 [inline]
get_tree_keyed+0xe5/0x170 fs/super.c:1398
vfs_get_tree+0x92/0x2a0 fs/super.c:1881
fc_mount fs/namespace.c:1282 [inline]
do_new_mount_fc fs/namespace.c:3910 [inline]
do_new_mount+0x325/0xb00 fs/namespace.c:3986
do_mount fs/namespace.c:4350 [inline]
__do_sys_mount fs/namespace.c:4565 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4542
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff61ba5fb19
RSP: 002b:00007ff619cae028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff61bce5fa0 RCX: 00007ff61ba5fb19
RDX: 00002000000002c0 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007ff61baf7b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff61bce6038 R14: 00007ff61bce5fa0 R15: 00007fff1bd994c8
rcu: rcu_preempt kthread starved for 10548 jiffies! g22281 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27784 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5584 [inline]
__schedule+0x1768/0x5780 kernel/sched/core.c:7389
__schedule_loop kernel/sched/core.c:7466 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7481
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
kthread+0x38b/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: fa 65 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 d4 13 00 fb f4 3c e7 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8f007ca0 EFLAGS: 00000246
RAX: 000000000034f709 RBX: ffffffff819b782c RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8dafbf1c RDI: ffffffff8bed3080
RBP: ffffffff8f007d78 R08: ffff8880b84341db R09: 1ffff1101708683b
R10: dffffc0000000000 R11: ffffed101708683c R12: 0000000000000000
R13: 1ffffffff1e1edf8 R14: 1ffffffff1e00f9c R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff88812470e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c34f9d0 CR3: 000000004231a000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:767 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:768
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x1cc/0x540 kernel/sched/idle.c:355
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:458
rest_init+0x378/0x3a0 init/main.c:789
start_kernel+0x392/0x3e0 init/main.c:1247
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x157