rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P20095/1:b..l
rcu: (detected by 1, t=10505 jiffies, g=207509, q=548 ncpus=2)
task:udevd state:R running task stack:24136 pid:20095 tgid:20095 ppid:5192 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7512
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x14f/0x730 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:folio_contains+0x217/0x2b0 include/linux/pagemap.h:987
Code: 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 4b 45 8b 36 4c 29 e3 48 89 df 4c 89 f6 e8 8c d9 c2 ff 4c 39 f3 <0f> 92 c0 5b 41 5c 41 5d 41 5e 41 5f 5d e9 72 59 0d ff cc e8 11 d7
RSP: 0018:ffffc90004ff74c8 EFLAGS: 00000297
RAX: ffffffff8202e784 RBX: 0000000000000000 RCX: ffff888033550000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 1ffffd4000274311 R08: ffffea00013a1887 R09: 1ffffd4000274310
R10: dffffc0000000000 R11: fffff94000274311 R12: 0000000000000551
R13: 1ffffd4000274310 R14: 0000000000000001 R15: 0000000000000000
find_lock_entries+0x768/0xb20 mm/filemap.c:2189
shmem_undo_range+0x2d6/0x1660 mm/shmem.c:1131
shmem_truncate_range mm/shmem.c:1277 [inline]
shmem_evict_inode+0x289/0xae0 mm/shmem.c:1407
evict+0x61e/0xb10 fs/inode.c:841
__dentry_kill+0x1a2/0x5e0 fs/dcache.c:670
finish_dput+0xc9/0x480 fs/dcache.c:879
__fput+0x691/0xa60 fs/file_table.c:518
task_work_run+0x1d9/0x270 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:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb860a7407
RSP: 002b:00007ffe43909790 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007feb867e9880 RCX: 00007feb860a7407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007feb867e96e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 0000563184f7b410 R14: 0000000000000008 R15: 0000563184f63500
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g207509 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=143584
rcu: rcu_preempt kthread starved for 10505 jiffies! g207509 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 28211 Comm: syz.1.5037 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__mm_get_cid kernel/sched/sched.h:3867 [inline]
RIP: 0010:mm_get_cid kernel/sched/sched.h:3880 [inline]
RIP: 0010:sched_mm_cid_fork+0x681/0x10e0 kernel/sched/core.c:10953
Code: 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 40 44 8b 35 97 76 94 0c 48 89 df 4c 89 f6 e8 d4 7d 1a 03 bd 00 00 00 80 <41> 39 c6 76 c5 41 89 c6 89 c1 c1 e9 06 48 8d 3c cb be 08 00 00 00
RSP: 0018:ffffc900034f7c48 EFLAGS: 00000046
RAX: 0000000000000002 RBX: ffff88807b93bc90 RCX: 0000000080000001
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88807b93bc90
RBP: 0000000080000000 R08: 1ffff1100f727641 R09: 0000000000000000
R10: ffff88807b93b34c R11: fffff5200069ef78 R12: 1ffffffff1c529d7
R13: 0000000080000000 R14: 0000000000000002 R15: ffff88807b93b100
FS: 00007fc9bfc866c0(0000) GS:ffff888125225000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcae63c068 CR3: 000000007e3fc000 CR4: 0000000000350ef0
Call Trace:
bprm_execve+0xdb7/0x1440 fs/exec.c:1771
do_execveat_common+0x50d/0x690 fs/exec.c:1846
__do_sys_execveat fs/exec.c:1941 [inline]
__se_sys_execveat fs/exec.c:1934 [inline]
__x64_sys_execveat+0xc7/0xf0 fs/exec.c:1934
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc9bed9c819
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:00007fc9bfc86028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007fc9bf015fa0 RCX: 00007fc9bed9c819
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000006
RBP: 00007fc9bee32c91 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc9bf016038 R14: 00007fc9bf015fa0 R15: 00007fff5740acf8