rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P29841/1:b..l P29257/1:b..l P29892/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=301781, q=320 ncpus=2)
task:modprobe state:R running task stack:23248 pid:29892 tgid:29892 ppid:3557 task_flags:0x400000 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x1664/0x5590 kernel/sched/core.c:6966
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7294
irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
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 02 56 0c 48 89 de 5b e9 83 90 5e 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 0d 28 92 57 11 65 8b 15 49 92 57 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc900043b7878 EFLAGS: 00000212
RAX: ffffffff82471f53 RBX: ffffc900043b7c58 RCX: 0000000000000000
RDX: ffff88802f46bd00 RSI: 000000000000006c RDI: 000000000000002f
RBP: 000000000000006c R08: ffffffff90121db7 R09: 1ffffffff20243b6
R10: dffffc0000000000 R11: fffffbfff20243b7 R12: dffffc0000000000
R13: ffffc900043b7c20 R14: ffffc900043b7c28 R15: ffff888035647320
link_path_walk+0xf3/0x18d0 fs/namei.c:2578
path_openat+0x2c3/0x3860 fs/namei.c:4826
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_sys_openat2+0x113/0x200 fs/open.c:1366
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fabcf6990ba
RSP: 002b:00007ffd23e4b6a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffd23e4b720 RCX: 00007fabcf6990ba
RDX: 0000000000080000 RSI: 00007ffd23e4b720 RDI: 00000000ffffff9c
RBP: 00007ffd23e4b710 R08: 00007ffd23e4b917 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000018
R13: 00007fabcf66d000 R14: 00007ffd23e4b930 R15: 0000000000000000
task:udevd state:R running task stack:25456 pid:29257 tgid:29257 ppid:5192 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x1664/0x5590 kernel/sched/core.c:6966
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7294
irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872
Code: e9 30 ff ff ff e8 e5 5a 0e 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 81 87 7b 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 0e b9 73
RSP: 0018:ffffc900034d7338 EFLAGS: 00000282
RAX: 8af6a4e291e0a700 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 000000000613a49c RSI: ffffffff8e1729a9 RDI: ffffffff8c27eb60
RBP: 0000000000000000 R08: ffffffff81769a45 R09: ffffffff8e760520
R10: ffffc900034d7498 R11: ffffffff81b0eed0 R12: 0000000000000002
R13: ffffffff8e760520 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495
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:5262 [inline]
__kmalloc_noprof+0x35c/0x760 mm/slub.c:5274
kmalloc_noprof include/linux/slab.h:954 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
tomoyo_encode+0x28b/0x550 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x58d/0x5d0 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827
security_inode_getattr+0x12b/0x310 security/security.c:1869
vfs_getattr+0x23/0x70 fs/stat.c:259
vfs_statx_path+0x2b/0x230 fs/stat.c:299
vfs_statx+0x12e/0x200 fs/stat.c:356
vfs_fstatat+0x11b/0x170 fs/stat.c:373
__do_sys_newfstatat fs/stat.c:538 [inline]
__se_sys_newfstatat fs/stat.c:532 [inline]
__x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4405511b0a
RSP: 002b:00007ffd6f6ff8d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000000000000002e RCX: 00007f4405511b0a
RDX: 00007ffd6f6ff8e0 RSI: 00007ffd6f6ff9b0 RDI: 00000000ffffff9c
RBP: 00007ffd6f7009f0 R08: 00007ffd6f701620 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd6f701620
R13: 0000000000000000 R14: 00007ffd6f701220 R15: 00007ffd6f700e20
task:syz.0.5221 state:R running task stack:25360 pid:29841 tgid:29839 ppid:22765 task_flags:0x40044c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x1664/0x5590 kernel/sched/core.c:6966
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7151
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:390 [inline]
zap_pte_range mm/memory.c:1946 [inline]
zap_pmd_range mm/memory.c:2002 [inline]
zap_pud_range mm/memory.c:2030 [inline]
zap_p4d_range mm/memory.c:2051 [inline]
unmap_page_range+0x3c17/0x4930 mm/memory.c:2072
unmap_single_vma mm/memory.c:2114 [inline]
unmap_vmas+0x48f/0x6a0 mm/memory.c:2152
exit_mmap+0x280/0xa10 mm/mmap.c:1302
__mmput+0x118/0x430 kernel/fork.c:1179
exit_mm+0x168/0x220 kernel/exit.c:581
do_exit+0x8b9/0x2580 kernel/exit.c:962
do_group_exit+0x21b/0x2d0 kernel/exit.c:1116
get_signal+0x1284/0x1330 kernel/signal.c:3032
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9bb7b9c799
RSP: 002b:00007f9bb5dd5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f9bb7e16090 RCX: 00007f9bb7b9c799
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f9bb7c32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9bb7e16128 R14: 00007f9bb7e16090 R15: 00007ffde956e5d8
rcu: rcu_preempt kthread starved for 10351 jiffies! g301781 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:28008 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x1664/0x5590 kernel/sched/core.c:6966
__schedule_loop kernel/sched/core.c:7049 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7064
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+0x51e/0xb90 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: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 9d 6b 02 e9 83 ec 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 4f 19 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e407dc0 EFLAGS: 00000242
RAX: 000000000446b9cb RBX: ffffffff819ababd RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8df00ec2 RDI: ffffffff8c27eb60
RBP: ffffffff8e407eb0 R08: ffff8880b863399b R09: 1ffff110170c6733
R10: dffffc0000000000 R11: ffffed10170c6734 R12: ffffffff90121db0
R13: 1ffffffff1c929d8 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88812544c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb9e6a4cd9 CR3: 000000007ba4e000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1bd/0x500 kernel/sched/idle.c:332
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
rest_init+0x2de/0x300 init/main.c:761
start_kernel+0x38a/0x3e0 init/main.c:1212
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147