rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11861/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=66289, q=736 ncpus=2)
task:syz-executor state:R running task stack:21344 pid:11861 tgid:11861 ppid:11852 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7190
irqentry_exit+0x5e3/0x670 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 54 0e da 0b 48 89 de 5b e9 b3 fb 5a 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 10 80 92 65 8b 15 58 18 bf 10 81 e2 00 01 ff 00
RSP: 0018:ffffc900043af4f8 EFLAGS: 00000202
RAX: ffffffff81f99e15 RBX: ffffc900043af9a0 RCX: ffff888028cabd00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900043af650 R08: ffffea0001a45947 R09: 1ffffd4000348b28
R10: dffffc0000000000 R11: fffff94000348b29 R12: ffffea0001a45940
R13: 000000000000059b R14: 0000000000000000 R15: 0000000000000001
find_lock_entries+0x7b5/0xa60 mm/filemap.c:2184
shmem_undo_range+0x254/0x1490 mm/shmem.c:1119
shmem_truncate_range mm/shmem.c:1249 [inline]
shmem_evict_inode+0x26e/0xa70 mm/shmem.c:1379
evict+0x5f4/0xae0 fs/inode.c:837
__dentry_kill+0x209/0x660 fs/dcache.c:670
finish_dput+0xc9/0x480 fs/dcache.c:879
__fput+0x68e/0xa70 fs/file_table.c:476
task_work_run+0x1d4/0x260 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c53f8e3aa
RSP: 002b:00007ffc71876bf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f4c53f8e3aa
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffc71876c4c R08: 0000000000000000 R09: 00007ffc71876957
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000003e
R13: 0000000000000043 R14: 00000000000e5372 R15: 00007ffc71876ca0
rcu: rcu_preempt kthread starved for 10438 jiffies! g66289 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:27360 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13609 Comm: syz.8.1999 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__lock_acquire+0x6d6/0x2cf0 kernel/locking/lockdep.c:5207
Code: ba 08 00 00 00 e8 6a 44 00 00 31 ed 85 c0 0f 84 6d 0d 00 00 83 3d 79 5b ed 17 00 75 13 48 63 44 24 18 48 0f a3 05 8a cb e9 11 <0f> 83 8a 1e 00 00 49 8b 9e 20 0b 00 00 48 83 7c 24 28 00 75 19 83
RSP: 0018:ffffc9000c5066c0 EFLAGS: 00000047
RAX: 000000000000017e RBX: ffff8880558f3d00 RCX: ffffffff9329ee20
RDX: 0000000000000008 RSI: ffff8880558f4880 RDI: ffff8880558f3d00
RBP: 0000000000000000 R08: ffffffff81fe0129 R09: ffff8880b87336f8
R10: dffffc0000000000 R11: fffff520018a0d5a R12: 0000000000000004
R13: ffff8880558f4880 R14: ffff8880558f3d00 R15: 0000000000000002
FS: 00007f1755a826c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3dad71 CR3: 000000009c6bd000 CR4: 0000000000350ef0
Call Trace:
lock_acquire+0x107/0x340 kernel/locking/lockdep.c:5868
local_lock_acquire include/linux/local_lock_internal.h:41 [inline]
lru_add_drain+0x91/0x3e0 mm/swap.c:736
lru_gen_shrink_lruvec mm/vmscan.c:5017 [inline]
shrink_lruvec+0x215/0x2980 mm/vmscan.c:5784
shrink_node_memcgs mm/vmscan.c:6020 [inline]
shrink_node+0xaa9/0x35b0 mm/vmscan.c:6061
shrink_zones mm/vmscan.c:6300 [inline]
do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6362
try_to_free_mem_cgroup_pages+0x2ea/0x7a0 mm/vmscan.c:6690
try_charge_memcg+0xa2d/0x1280 mm/memcontrol.c:2388
try_charge mm/memcontrol.c:2530 [inline]
charge_memcg+0x9f/0x180 mm/memcontrol.c:4728
__mem_cgroup_charge+0x25/0x80 mm/memcontrol.c:4745
mem_cgroup_charge include/linux/memcontrol.h:663 [inline]
shmem_alloc_and_add_folio+0x790/0xf40 mm/shmem.c:1942
shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2556
shmem_get_folio mm/shmem.c:2662 [inline]
shmem_write_begin+0x16c/0x330 mm/shmem.c:3315
generic_perform_write+0x2c5/0x900 mm/filemap.c:4314
shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3490
iter_file_splice_write+0x972/0x10b0 fs/splice.c:738
do_splice_from fs/splice.c:938 [inline]
direct_splice_actor+0x101/0x160 fs/splice.c:1161
splice_direct_to_actor+0x5a8/0xcc0 fs/splice.c:1105
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1230
do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
__do_sys_sendfile64 fs/read_write.c:1431 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1754b8f749
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:00007f1755a82038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f1754de5fa0 RCX: 00007f1754b8f749
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000009
RBP: 00007f1754c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000100000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1754de6038 R14: 00007f1754de5fa0 R15: 00007fff77721958