rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7677/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=64609, q=70 ncpus=1)
task:syz-executor state:R running task stack:21800 pid:7677 ppid:7670 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
irqentry_exit+0x67/0x70 kernel/entry/common.c:441
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_count_sub+0x65/0x160 kernel/sched/core.c:5886
Code: ff ff ff 7f 39 cf 7f 25 81 ff ff 00 00 00 0f 93 c1 84 c0 0f 95 c0 08 c8 74 53 65 8b 05 5c bd a6 7e f7 df 65 01 3d 53 bd a6 7e <5b> 5d c3 e8 43 c6 d3 02 85 c0 74 f4 48 c7 c0 30 66 8c 8e 48 c1 e8
RSP: 0018:ffffc9000b3a7360 EFLAGS: 00000297
RAX: 0000000080000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffc9000b3a7f10 RDI: 00000000ffffffff
RBP: 0000000000000001 R08: ffff8880187a3c00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc9000b3a7f10
R13: ffffc9000b3a7448 R14: ffffc9000b3a7f20 R15: ffffc9000b3a7458
unwind_next_frame+0x1d1b/0x2990 arch/x86/kernel/unwind_orc.c:672
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
save_stack+0x125/0x230 mm/page_owner.c:128
__reset_page_owner+0x4e/0x190 mm/page_owner.c:149
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1182 [inline]
free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505
release_pages+0x208a/0x2300 mm/swap.c:1022
__folio_batch_release+0x71/0xe0 mm/swap.c:1042
folio_batch_release include/linux/pagevec.h:83 [inline]
shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026
shmem_truncate_range mm/shmem.c:1135 [inline]
shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264
evict+0x4b7/0x8a0 fs/inode.c:705
do_unlinkat+0x38c/0x590 fs/namei.c:4453
__do_sys_unlink fs/namei.c:4494 [inline]
__se_sys_unlink fs/namei.c:4492 [inline]
__x64_sys_unlink+0x49/0x50 fs/namei.c:4492
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffb12b9d247
RSP: 002b:00007ffee2958338 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ffb12b9d247
RDX: 00007ffee2958360 RSI: 00007ffee29583f0 RDI: 00007ffee29583f0
RBP: 00007ffee29583f0 R08: 00007ffee29593f0 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffee2959480
R13: 00007ffb12c344bb R14: 00000000000cda2d R15: 00007ffee29594c0
rcu: rcu_preempt kthread starved for 10502 jiffies! g64609 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:26824 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 11039 Comm: syz.6.1118 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_region_inline mm/kasan/generic.c:-1 [inline]
RIP: 0010:kasan_check_range+0x12/0x290 mm/kasan/generic.c:187
Code: 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc 66 0f 1f 00 b0 01 48 85 f6 0f 84 b4 01 00 00 55 41 57 <41> 56 41 55 41 54 53 4c 8d 04 37 49 39 f8 0f 82 13 02 00 00 49 89
RSP: 0018:ffffc9000b1cf6a8 EFLAGS: 00000202
RAX: ffffffff887dec01 RBX: ffff888026c79000 RCX: ffffffff887dec18
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888026c790e4
RBP: 0000000000000002 R08: ffff888026c790e7 R09: 1ffff11004d8f21c
R10: dffffc0000000000 R11: ffffed1004d8f21d R12: ffff888026c79000
R13: 1ffff11004d8f208 R14: ffff888026c790e4 R15: dffffc0000000000
FS: 00007f9362ae86c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9361b872c0 CR3: 0000000064645000 CR4: 00000000003506f0
Call Trace:
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline]
__refcount_sub_and_test include/linux/refcount.h:272 [inline]
__refcount_dec_and_test include/linux/refcount.h:315 [inline]
refcount_dec_and_test+0x18/0x70 include/linux/refcount.h:333
skb_unref include/linux/skbuff.h:1249 [inline]
consume_skb+0xcf/0x110 net/core/skbuff.c:1283
unix_stream_read_generic+0xd32/0x1ea0 net/unix/af_unix.c:2852
unix_stream_recvmsg+0x169/0x1c0 net/unix/af_unix.c:2966
sock_recvmsg_nosec net/socket.c:1047 [inline]
sock_recvmsg net/socket.c:1069 [inline]
____sys_recvmsg+0x2bd/0x5d0 net/socket.c:2814
___sys_recvmsg+0x214/0x590 net/socket.c:2856
__sys_recvmsg net/socket.c:2886 [inline]
__do_sys_recvmsg net/socket.c:2896 [inline]
__se_sys_recvmsg net/socket.c:2893 [inline]
__x64_sys_recvmsg+0x21e/0x2f0 net/socket.c:2893
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9361b9e159
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:00007f9362ae8028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f9361e25fa0 RCX: 00007f9361b9e159
RDX: 0000000040002002 RSI: 0000200000000000 RDI: 0000000000000005
RBP: 00007f9361c3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9361e26038 R14: 00007f9361e25fa0 R15: 00007fff88a8da38