rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P25377/1:b..l P25338/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=150177, q=224 ncpus=2)
task:syz.7.4904 state:R running task stack:24304 pid:25338 tgid:25337 ppid:17869 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x16c/0x340 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 f4 39 e0 10 <48> 3b 44 24 58 0f 85 e5 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000b687420 EFLAGS: 00000206
RAX: 6ced4c52264ab600 RBX: 0000000000000000 RCX: 6ced4c52264ab600
RDX: 00000000ba12b26f RSI: ffffffff8d978ed0 RDI: ffffffff8bc08360
RBP: ffffffff8264496c R08: ffffffff8264496c R09: ffffffff8df419e0
R10: dffffc0000000000 R11: ffffed100a401279 R12: 0000000000000002
R13: ffffffff8df419e0 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
kernfs_root+0x38/0x230 fs/kernfs/kernfs-internal.h:75
kernfs_root_is_locked fs/kernfs/kernfs-internal.h:109 [inline]
kernfs_parent+0x51/0x190 fs/kernfs/kernfs-internal.h:133
kernfs_unlink_sibling+0x5a/0x180 fs/kernfs/dir.c:423
__kernfs_remove+0x3d4/0x650 fs/kernfs/dir.c:1517
kernfs_remove_by_name_ns+0xaf/0x130 fs/kernfs/dir.c:1720
kernfs_remove_by_name include/linux/kernfs.h:633 [inline]
remove_files fs/sysfs/group.c:28 [inline]
sysfs_remove_group+0xfc/0x2f0 fs/sysfs/group.c:328
sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:352
destroy_gid_attrs drivers/infiniband/core/sysfs.c:1182 [inline]
ib_free_port_attrs+0xc5/0x3b0 drivers/infiniband/core/sysfs.c:1407
remove_one_compat_dev drivers/infiniband/core/device.c:1038 [inline]
rdma_dev_exit_net+0x1d8/0x340 drivers/infiniband/core/device.c:1176
ops_exit_list net/core/net_namespace.c:199 [inline]
ops_undo_list+0x49a/0x990 net/core/net_namespace.c:252
setup_net+0x2e8/0x330 net/core/net_namespace.c:462
copy_net_ns+0x3e3/0x570 net/core/net_namespace.c:581
create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:130
copy_namespaces+0x438/0x4b0 kernel/nsproxy.c:195
copy_process+0x1689/0x3950 kernel/fork.c:2224
kernel_clone+0x21e/0x820 kernel/fork.c:2651
__do_sys_clone kernel/fork.c:2792 [inline]
__se_sys_clone kernel/fork.c:2776 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2776
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f52c658f749
RSP: 002b:00007f52c745afe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f52c67e5fa0 RCX: 00007f52c658f749
RDX: 0000200000001f80 RSI: 0000200000001f40 RDI: 0000000044208000
RBP: 00007f52c6613f91 R08: 0000200000002000 R09: 0000200000002000
R10: 0000200000001fc0 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f52c67e6038 R14: 00007f52c67e5fa0 R15: 00007ffecbbc2798
task:syz.0.4920 state:R running task stack:25336 pid:25377 tgid:25375 ppid:16295 task_flags:0x400040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:mtree_range_walk+0x36f/0x840 lib/maple_tree.c:-1
Code: eb 23 e8 84 c5 6c f6 c7 44 24 04 00 00 00 00 31 db eb 60 e8 73 c5 6c f6 48 89 d9 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 48 24 e8 5a c5 6c f6 8b 44 24 04 89 c3 4c 8b 6c 24 18 48 bd 00 00
RSP: 0000:ffffc9000d427c40 EFLAGS: 00000283
RAX: ffff88807db20008 RBX: 0000000000000001 RCX: 0000000000000001
RDX: ffffc9001a99a000 RSI: 000000000004e793 RDI: 000000000004e794
RBP: dffffc0000000000 R08: ffff88801bfa1e80 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000002 R12: ffff88807db20010
R13: 00007fc807dfffff R14: 00007fc7fe509000 R15: ffff88807db20000
mas_state_walk lib/maple_tree.c:3298 [inline]
mas_walk+0xc6/0x2e0 lib/maple_tree.c:4599
lock_vma_under_rcu+0x193/0x4a0 mm/mmap_lock.c:253
do_user_addr_fault+0x2d9/0x1380 arch/x86/mm/fault.c:1327
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fc807e509e6
RSP: 002b:00007fc808d5a4a0 EFLAGS: 00010206
RAX: 0000000000909001 RBX: 00007fc808d5a540 RCX: 0000000000000062
RDX: 0000000000000005 RSI: 0000000000000001 RDI: 00007fc808d5a5e0
RBP: 0000000000000102 R08: 00007fc7fdc00000 R09: 0000000000909000
R10: 0000000000000000 R11: 00007fc808d5a550 R12: 0000000000000001
R13: 00007fc80802fc40 R14: 0000000000000000 R15: 00007fc808d5a5e0
rcu: rcu_preempt kthread starved for 10578 jiffies! g150177 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:26832 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 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+0x599/0xb30 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 25364 Comm: syz.1.4912 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:fpregs_activate+0x15/0x1c0 arch/x86/kernel/fpu/context.h:49
Code: 6c ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 48 89 fb e8 52 f7 57 00 48 c7 c7 60 a2 65 8b c6 15 f2 09 65 48 89 1d 4e 2b 15 11 0f 1f 44 00 00 e8 34 f7 57
RSP: 0018:ffffc9000b3d7a90 EFLAGS: 00000246
RAX: ffffffff8169b9ae RBX: ffff8880695719c0 RCX: 0000000000080000
RDX: ffffc90015401000 RSI: 000000000007ffff RDI: ffffffff8b65a260
RBP: 0000000000000000 R08: ffff888069570007 R09: 1ffff1100d2ae000
R10: dffffc0000000000 R11: ffffed100d2ae001 R12: ffffffff8169f16b
R13: dffffc0000000000 R14: ffff8880695719c0 R15: dffffc0000000000
FS: 00007f79e11b36c0(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc8081e7dac CR3: 000000001c2bc000 CR4: 0000000000350ef0
Call Trace:
fpregs_mark_activate+0x64/0xe0 arch/x86/kernel/fpu/core.c:903
restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:317 [inline]
__fpu_restore_sig arch/x86/kernel/fpu/signal.c:346 [inline]
fpu__restore_sig+0x95b/0x10d0 arch/x86/kernel/fpu/signal.c:480
restore_sigcontext arch/x86/kernel/signal_64.c:95 [inline]
__ia32_sys_rt_sigreturn+0x704/0x860 arch/x86/kernel/signal_64.c:268
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f79e038f747
Code: ff ff 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
RSP: 002b:00007f79e11b3038 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f79e05e6090 RCX: 00007f79e038f749
RDX: 0000000000000008 RSI: 0000200000000240 RDI: 0000000000000007
RBP: 00007f79e0413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f79e05e6128 R14: 00007f79e05e6090 R15: 00007ffd03a34968
raw-gadget.0 gadget.1: ignoring, device is not running