rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5602/1:b..l P8116/1:b..l
rcu: (detected by 0, t=10506 jiffies, g=43413, q=448 ncpus=2)
task:syz-executor state:R running task stack:23864 pid:8116 tgid:8116 ppid:8101 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__kasan_check_read+0x8/0x20 mm/kasan/shadow.c:31
Code: fe 90 0f 0b 90 48 83 c4 60 5b 5d 41 5c e9 c0 fe 55 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 0c 24 <89> f6 31 d2 e9 0f f3 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
RSP: 0018:ffffc9000427f660 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffea0001a4b380 RCX: ffffffff824dcded
RDX: ffff888032f54b00 RSI: 0000000000000008 RDI: ffffea0001a4b380
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 00000000000000c2
R13: 0000000000000001 R14: ffffea0001a4b388 R15: dffffc0000000000
instrument_atomic_read include/linux/instrumented.h:82 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
folio_test_swapbacked include/linux/page-flags.h:572 [inline]
folio_test_swapcache include/linux/page-flags.h:627 [inline]
folio_contains include/linux/pagemap.h:984 [inline]
find_lock_entries+0xcdd/0x1190 mm/filemap.c:2207
shmem_undo_range+0x212/0x1570 mm/shmem.c:1143
shmem_truncate_range mm/shmem.c:1289 [inline]
shmem_evict_inode+0x3b1/0xca0 mm/shmem.c:1420
evict+0x3c2/0xad0 fs/inode.c:822
iput_final fs/inode.c:2014 [inline]
iput.part.0+0x989/0x1050 fs/inode.c:2063
iput+0x35/0x40 fs/inode.c:2029
filename_unlinkat+0x466/0x730 fs/namei.c:5723
__do_sys_unlink fs/namei.c:5754 [inline]
__se_sys_unlink fs/namei.c:5751 [inline]
__x64_sys_unlink+0x46/0x70 fs/namei.c:5751
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f51ba59d247
RSP: 002b:00007ffc868597d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f51ba59d247
RDX: 00007ffc86859800 RSI: 00007ffc86859890 RDI: 00007ffc86859890
RBP: 00007ffc86859890 R08: 00007ffc8685a890 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc8685a920
R13: 00007f51ba6344bb R14: 000000000008db7e R15: 00007ffc8685a960
task:syz-executor state:R running task stack:22856 pid:5602 tgid:5602 ppid:5592 task_flags:0x400140 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:107 [inline]
RIP: 0010:raw_atomic_try_cmpxchg include/linux/atomic/atomic-arch-fallback.h:2130 [inline]
RIP: 0010:raw_atomic_fetch_add_unless include/linux/atomic/atomic-arch-fallback.h:2431 [inline]
RIP: 0010:raw_atomic_add_unless include/linux/atomic/atomic-arch-fallback.h:2456 [inline]
RIP: 0010:atomic_add_unless include/linux/atomic/atomic-instrumented.h:1518 [inline]
RIP: 0010:page_ref_add_unless_zero include/linux/page_ref.h:251 [inline]
RIP: 0010:folio_ref_add_unless_zero include/linux/page_ref.h:260 [inline]
RIP: 0010:folio_try_get include/linux/page_ref.h:276 [inline]
RIP: 0010:find_get_entry mm/filemap.c:2099 [inline]
RIP: 0010:find_lock_entries+0x225/0x1190 mm/filemap.c:2189
Code: be ff 31 ff 44 89 e6 45 89 e5 e8 a6 7f be ff 45 85 e4 0f 84 c9 02 00 00 e8 28 85 be ff 41 8d 54 24 01 44 89 e0 f0 0f b1 55 00 <41> 0f 94 c6 31 ff 41 89 c4 44 89 f6 e8 1a 7f be ff 45 84 f6 74 bd
RSP: 0018:ffffc90003b67668 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffea0000e8c440 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff824dc328 RDI: ffff888031310000
RBP: ffffea0000e8c474 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000
shmem_undo_range+0x212/0x1570 mm/shmem.c:1143
shmem_truncate_range mm/shmem.c:1289 [inline]
shmem_evict_inode+0x3b1/0xca0 mm/shmem.c:1420
evict+0x3c2/0xad0 fs/inode.c:822
iput_final fs/inode.c:2014 [inline]
iput.part.0+0x989/0x1050 fs/inode.c:2063
iput+0x35/0x40 fs/inode.c:2029
filename_unlinkat+0x466/0x730 fs/namei.c:5723
__do_sys_unlink fs/namei.c:5754 [inline]
__se_sys_unlink fs/namei.c:5751 [inline]
__x64_sys_unlink+0x46/0x70 fs/namei.c:5751
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f915ad9d247
RSP: 002b:00007ffce941e378 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f915ad9d247
RDX: 00007ffce941e3a0 RSI: 00007ffce941e430 RDI: 00007ffce941e430
RBP: 00007ffce941e430 R08: 00007ffce941f430 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffce941f4c0
R13: 00007f915ae344bb R14: 000000000008c979 R15: 00007ffce941f500
rcu: rcu_preempt kthread starved for 10506 jiffies! g43413 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:27560 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7376
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 47 93 02 c3 cc cc cc cc 0f 1f 00 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 73 38 19 00 fb f4 0c 50 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8ea07cf0 EFLAGS: 00000242
RAX: 00000000017c740b RBX: ffffffff8ea91580 RCX: ffffffff8bd28215
RDX: 0000000000000001 RSI: ffffffff8e38e858 RDI: ffffffff8c623980
RBP: fffffbfff1d522b0 R08: 0000000000000001 R09: ffffed10170867bd
R10: ffff8880b8433deb R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffffffff1d40fa2 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888123b4f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32c01ff8 CR3: 000000005c235000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:768
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x3ae/0x5b0 kernel/sched/idle.c:355
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454
rest_init+0x2d3/0x2e0 init/main.c:732
start_kernel+0x48e/0x490 init/main.c:1190
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x158