rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11484/1:b..l P12197/1:b..l P11579/1:b..l P9628/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=153113, q=609 ncpus=1)
task:syz-executor state:R running task stack:22288 pid:9628 tgid:9628 ppid:9615 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7449
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
copy_pte_range mm/memory.c:1429 [inline]
copy_pmd_range+0x5176/0x5c10 mm/memory.c:1490
copy_pud_range mm/memory.c:1527 [inline]
copy_p4d_range mm/memory.c:1551 [inline]
copy_page_range+0xc82/0x1290 mm/memory.c:1637
dup_mmap+0xf17/0x1dc0 mm/mmap.c:1819
dup_mm kernel/fork.c:1543 [inline]
copy_mm+0x11a/0x480 kernel/fork.c:1595
copy_process+0x1e75/0x43e0 kernel/fork.c:2307
kernel_clone+0x2d7/0x940 kernel/fork.c:2766
__do_sys_clone kernel/fork.c:2908 [inline]
__se_sys_clone kernel/fork.c:2892 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2892
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff1549c6bd2
RSP: 002b:00007ffff6405e80 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffff6405e80 RCX: 00007ff1549c6bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffff640600c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555817217d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000ca517 R15: 00007ffff6406060
task:udevd state:R running task stack:24304 pid:11579 tgid:11579 ppid:4980 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:kernfs_root+0xb6/0x230 include/linux/rcupdate.h:-1
Code: c0 f4 4d ff eb 24 e8 b9 f4 4d ff c6 05 6a b4 e9 0d 01 48 c7 c7 60 a2 23 8c be 53 03 00 00 48 c7 c2 a0 a2 23 8c e8 ba a0 29 ff <49> bc 00 00 00 00 00 fc ff df 4d 8d 7e 30 4c 89 f8 48 c1 e8 03 42
RSP: 0018:ffffc900001078f8 EFLAGS: 00000293
RAX: ffffffff8279c62e RBX: ffffffff8279c5ec RCX: ffff88807ce6be80
RDX: 0000000000000000 RSI: ffffffff8c6d9360 RDI: ffffffff8c6d9320
RBP: 0000000000000001 R08: 8f00000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8ed5c6e0 R12: ffff88801eaf9000
R13: ffff88801d6c9780 R14: ffff88801eaf9000 R15: 0000000000000006
kernfs_root_is_locked fs/kernfs/kernfs-internal.h:110 [inline]
kernfs_rcu_name fs/kernfs/kernfs-internal.h:120 [inline]
kernfs_get_target_path fs/kernfs/symlink.c:84 [inline]
kernfs_getlink fs/kernfs/symlink.c:122 [inline]
kernfs_iop_get_link+0x2a2/0x6c0 fs/kernfs/symlink.c:140
pick_link+0x72f/0xfe0 fs/namei.c:-1
step_into_slowpath+0x58a/0x820 fs/namei.c:2127
step_into fs/namei.c:2152 [inline]
open_last_lookups fs/namei.c:4780 [inline]
path_openat+0x98e/0x1d60 fs/namei.c:4997
do_file_open+0x23e/0x4a0 fs/namei.c:5029
do_sys_openat2+0x115/0x200 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd2d0a7407
RSP: 002b:00007fff5d622470 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007efd2d7a7880 RCX: 00007efd2d0a7407
RDX: 0000000000080000 RSI: 00005615c0d95620 RDI: ffffffffffffff9c
RBP: 00005615c0d95620 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
task:syz-executor state:R running task stack:21672 pid:12197 tgid:12197 ppid:12179 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_release+0x2e1/0x3c0 kernel/locking/lockdep.c:5934
Code: 56 f1 11 00 00 00 00 eb b5 e8 1b 76 40 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 73 11 f1 11 48 3b 44 24 28 75 48 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 3b f2 6c ff cc 48 8d 3d 68 01 da
RSP: 0018:ffffc90003106608 EFLAGS: 00000282
RAX: 31b5df2d9b4edb00 RBX: 0000000000000206 RCX: 0000000000000046
RDX: ffffc90003106701 RSI: ffffffff8e6fc287 RDI: ffffffff8c6d9380
RBP: ffff888031484a80 R08: ffffc900031071b0 R09: ffffc90003106738
R10: dffffc0000000000 R11: fffff52000620ce9 R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8ed5c6e0 R15: ffff888031483e80
rcu_lock_release include/linux/rcupdate.h:319 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
class_rcu_destructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5414 [inline]
__kmalloc_node_track_caller_noprof+0x4b4/0x720 mm/slub.c:5545
__kmemdup_nul mm/util.c:64 [inline]
kstrdup+0x42/0x100 mm/util.c:84
__kernfs_new_node+0xa9/0x980 fs/kernfs/dir.c:661
kernfs_new_node fs/kernfs/dir.c:751 [inline]
kernfs_create_dir_ns+0xfe/0x230 fs/kernfs/dir.c:1120
sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x622/0xcd0 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_init_and_add+0x12b/0x1a0 lib/kobject.c:457
rx_queue_add_kobject net/core/net-sysfs.c:1239 [inline]
net_rx_queue_update_kobjects+0x247/0x780 net/core/net-sysfs.c:1301
register_queue_kobjects net/core/net-sysfs.c:2093 [inline]
netdev_register_kobject+0x23e/0x350 net/core/net-sysfs.c:2344
register_netdevice+0x1433/0x1eb0 net/core/dev.c:11503
br_dev_newlink+0x6a/0x150 net/bridge/br_netlink.c:1602
rtnl_newlink_create+0x305/0x7b0 net/core/rtnetlink.c:3969
__rtnl_newlink net/core/rtnetlink.c:4098 [inline]
rtnl_newlink+0x166d/0x1c30 net/core/rtnetlink.c:4215
rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7132
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800
__sock_sendmsg net/socket.c:815 [inline]
__sys_sendto+0x408/0x5a0 net/socket.c:2281
__do_sys_sendto net/socket.c:2288 [inline]
__se_sys_sendto net/socket.c:2284 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2284
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1f53f5e98e
RSP: 002b:00007ffde0020dc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055558d249500 RCX: 00007f1f53f5e98e
RDX: 000000000000004c RSI: 00007f1f54d54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffde0020e44 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f1f54d54670 R15: 0000000000000000
task:syz.1.1046 state:R running task stack:21096 pid:11484 tgid:11484 ppid:9960 task_flags:0x40064c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7449
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
_raw_spin_unlock_irqrestore+0x76/0x80 kernel/locking/spinlock.c:221
spin_unlock_irqrestore include/linux/spinlock.h:425 [inline]
lruvec_unlock_irqrestore include/linux/memcontrol.h:1535 [inline]
folios_put_refs+0x8b0/0xb30 mm/folio.c:1026
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x4e6/0x15d0 mm/shmem.c:1161
shmem_truncate_range mm/shmem.c:1289 [inline]
shmem_evict_inode+0x247/0xae0 mm/shmem.c:1420
evict+0x624/0xb50 fs/inode.c:822
dentry_kill+0x1b9/0x880 fs/dcache.c:826
finish_dput+0x1a/0x260 fs/dcache.c:1001
__fput+0x675/0xa50 fs/file_table.c:520
task_work_run+0x1d9/0x270 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x73a/0x2360 kernel/exit.c:1008
do_group_exit+0x22d/0x2f0 kernel/exit.c:1151
get_signal+0x121b/0x12c0 kernel/signal.c:3039
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop kernel/entry/common.c:101 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
irqentry_exit+0x2ba/0x910 kernel/entry/common.c:165
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f25a6b9e161
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f25a6e25fa0 RCX: 00007f25a6b9e159
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f25a6c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f25a6e26038 R14: 00007f25a6e25fa0 R15: 00007fff276ecdf8
rcu: rcu_preempt kthread starved for 10502 jiffies! g153113 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:27296 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7270
__schedule_loop kernel/sched/core.c:7347 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7362
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 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:
CPU: 0 UID: 0 PID: 12268 Comm: syz.1.1118 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:__get_user_nocheck_8+0x3/0x20 arch/x86/lib/getuser.S:144
Code: c0 0f 01 ca e9 89 d5 2d f5 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <0f> ae e8 48 8b 10 31 c0 0f 01 ca e9 58 d5 2d f5 90 90 90 90 90 90
RSP: 0018:ffffc90003fe7918 EFLAGS: 00040246
RAX: 00007f25a7b12f00 RBX: 00007f25a7b12ed0 RCX: 00007f25a7b12f00
RDX: ffffc90015d7e000 RSI: 0000000000000000 RDI: 0000000000080000
RBP: ffffc90003fe7ad0 R08: ffffc90003fe79cf R09: 1ffff920007fcf39
R10: dffffc0000000000 R11: fffff520007fcf3a R12: dffffc0000000000
R13: ffffc90003fe79f0 R14: 00007f25a7b13040 R15: 0000000000000000
FS: 00007f25a7b136c0(0000) GS:ffff888124cda000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000005368d000 CR4: 0000000000350ef0
Call Trace:
set_xfeature_in_sigframe arch/x86/kernel/fpu/xstate.h:79 [inline]
save_xstate_epilog arch/x86/kernel/fpu/signal.c:145 [inline]
copy_fpstate_to_sigframe+0xb15/0xd20 arch/x86/kernel/fpu/signal.c:237
get_sigframe+0x603/0x830 arch/x86/kernel/signal.c:163
x64_setup_rt_frame+0x163/0xc50 arch/x86/kernel/signal_64.c:175
setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
handle_signal arch/x86/kernel/signal.c:294 [inline]
arch_do_signal_or_restart+0x456/0x860 arch/x86/kernel/signal.c:339
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
__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:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f25a6b9e159
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:00007f25a7b130e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007f25a6e25fa8 RCX: 00007f25a6b9e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f25a6e25fa8
RBP: 00007f25a6e25fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f25a6e26038 R14: 00007fff276ecd10 R15: 00007fff276ecdf8