rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12823/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=82229, q=893 ncpus=2)
task:syz.6.1201 state:R running task stack:22272 pid:12823 tgid:12823 ppid:10759 task_flags:0x40064c flags:0x00080001
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 04 0e da 0b 48 89 de 5b e9 83 fd 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 08 18 bf 10 81 e2 00 01 ff 00
RSP: 0018:ffffc9000ba6f160 EFLAGS: 00000246
RAX: ffffffff81f98ee7 RBX: 00000000000003f1 RCX: ffff88802b230000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 1ffffd40001cf951 R08: ffffea0000e7ca87 R09: 1ffffd40001cf950
R10: dffffc0000000000 R11: fffff940001cf951 R12: 0000000000000000
R13: 1ffffd40001cf950 R14: ffffea0000e7ca80 R15: ffffea0000e7ca88
folio_contains+0x127/0x2b0 include/linux/pagemap.h:986
find_lock_entries+0x7a8/0xa60 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
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x694/0x22f0 kernel/exit.c:971
do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
get_signal+0x1285/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x178/0x670 kernel/entry/common.c:196
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f90a438f751
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f90a45e6090 RCX: 00007f90a438f749
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f90a4413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f90a45e6128 R14: 00007f90a45e6090 R15: 00007fffa9c1ec18
rcu: rcu_preempt kthread starved for 9938 jiffies! g82229 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:27576 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: 12848 Comm: syz.6.1205 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:rcu_read_lock_any_held+0x5f/0x90 kernel/rcu/update.c:387
Code: 75 2a 48 c7 c7 00 1b f4 8d be ff ff ff ff e8 58 f0 b3 09 85 c0 75 15 48 c7 c7 60 1b f4 8d be ff ff ff ff e8 43 f0 b3 09 85 c0 <74> 0e bb 01 00 00 00 89 d8 5b e9 ed 6d 6a ff cc 65 8b 05 0a 3d da
RSP: 0018:ffffc9000b027db0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000080000001
RDX: ffff8880340cdb80 RSI: ffffffff8d97663c RDI: ffffffff8bc083e0
RBP: ffffc9000b027ee0 R08: ffff8880644e441b R09: 1ffff1100c89c883
R10: dffffc0000000000 R11: ffffed100c89c884 R12: ffff8880644e4000
R13: ffff8880644e4350 R14: dffffc0000000000 R15: 1ffff1100c89c86a
FS: 00007f90a1dd16c0(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f6b0fb7088 CR3: 000000005e875000 CR4: 0000000000350ef0
Call Trace:
rcu_sync_is_idle include/linux/rcu_sync.h:34 [inline]
percpu_up_read include/linux/percpu-rwsem.h:118 [inline]
__sb_end_write include/linux/fs/super.h:14 [inline]
sb_end_write include/linux/fs/super.h:77 [inline]
quotactl_block fs/quota/quota.c:900 [inline]
__do_sys_quotactl fs/quota/quota.c:955 [inline]
__se_sys_quotactl+0x6a6/0x950 fs/quota/quota.c:917
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: 0033:0x7f90a438f749
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:00007f90a1dd1038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f90a45e6360 RCX: 00007f90a438f749
RDX: 0000000000000000 RSI: 0000200000000140 RDI: ffffffff80000600
RBP: 00007f90a4413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f90a45e63f8 R14: 00007f90a45e6360 R15: 00007fffa9c1ec18