rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4533/2:b..l P5929/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=18461, q=651 ncpus=2)
task:syz-executor state:R running task stack:19728 pid:5929 tgid:5929 ppid:5925 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x1796/0x49d0 kernel/sched/core.c:6745
preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:7017
preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
rcu_is_watching+0x7e/0xb0 kernel/rcu/tree.c:725
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0xe3/0x550 kernel/locking/lockdep.c:5725
rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
rcu_read_lock include/linux/rcupdate.h:781 [inline]
vma_end_read+0x35/0x170 include/linux/mm.h:706
do_user_addr_fault arch/x86/mm/fault.c:1340 [inline]
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x4c8/0x8c0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f682723ca87
RSP: 002b:00007ffcf78f9cd0 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 00007ffcf78f9d50 RCX: 0000000000000001
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffcf78f9cec R09: 00007ffcf78fa107
R10: 00007ffcf78f9d50 R11: 0000000000000216 R12: 00007f68274d1e40
R13: 00007ffcf78f9cec R14: 0000000000000000 R15: 00007f68274d4000
task:udevd state:R running task stack:22048 pid:4533 tgid:4533 ppid:1 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x1796/0x49d0 kernel/sched/core.c:6745
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7067
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__canonical_address arch/x86/include/asm/page.h:79 [inline]
RIP: 0010:__is_canonical_address arch/x86/include/asm/page.h:84 [inline]
RIP: 0010:copy_from_kernel_nofault_allowed+0x76/0x130 arch/x86/mm/maccess.c:36
Code: 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 6f 0f b6 1d 9d c3 69 0e 31 ff 89 de e8 64 9c 53 00 85 db 74 4a 41 be 40 00 00 00 <41> 29 de bf 41 00 00 00 89 de e8 4b 9c 53 00 80 fb 40 77 60 e8 41
RSP: 0018:ffffc90003de77a0 EFLAGS: 00000206
RAX: 0000000000000000 RBX: 0000000000000030 RCX: dffffc0000000000
RDX: ffff88807ccb0000 RSI: 0000000000000030 RDI: 0000000000000000
RBP: ffff88802c2ae1c0 R08: ffffffff81428dcc R09: 1ffffffff25eecb7
R10: dffffc0000000000 R11: fffffbfff25eecb8 R12: ffff888077a89678
R13: 0000000000000005 R14: 0000000000000040 R15: ffff888077a89678
copy_from_kernel_nofault+0x28/0x2e0 mm/maccess.c:31
prepend_copy fs/d_path.c:50 [inline]
prepend fs/d_path.c:76 [inline]
prepend_name fs/d_path.c:101 [inline]
__prepend_path fs/d_path.c:133 [inline]
prepend_path+0x51f/0xbe0 fs/d_path.c:172
d_absolute_path+0x179/0x310 fs/d_path.c:234
tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline]
tomoyo_realpath_from_path+0x2b4/0x5e0 security/tomoyo/realpath.c:271
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822
security_inode_getattr+0xd8/0x130 security/security.c:2269
vfs_getattr+0x45/0x430 fs/stat.c:173
vfs_fstat fs/stat.c:198 [inline]
vfs_fstatat+0xd6/0x190 fs/stat.c:300
__do_sys_newfstatat fs/stat.c:468 [inline]
__se_sys_newfstatat fs/stat.c:462 [inline]
__x64_sys_newfstatat+0x125/0x1b0 fs/stat.c:462
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f31d93865f4
RSP: 002b:00007ffd04e49288 EFLAGS: 00000202 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 0000558c5ff04e10 RCX: 00007f31d93865f4
RDX: 00007ffd04e492a0 RSI: 00007f31d9423130 RDI: 000000000000000d
RBP: 0000558c5ff5e340 R08: 0000000000090800 R09: 0000558c5ff002f0
R10: 0000000000001000 R11: 0000000000000202 R12: 00007ffd04e492a0
R13: 00000000000000ff R14: 0000558c3df521c4 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10553 jiffies! g18461 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:25392 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5408 [inline]
__schedule+0x1796/0x49d0 kernel/sched/core.c:6745
__schedule_loop kernel/sched/core.c:6822 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6837
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.10.0-rc7-syzkaller-00266-g4d145e3f830b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112
Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 80 d4 03 00 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d 35 06 ab 00 f3 0f 1e fa fb f4 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffffff8e007ca8 EFLAGS: 00000246
RAX: ffffffff8e094680 RBX: ffff88801c291064 RCX: 00000000002ce5f1
RDX: 0000000000000001 RSI: ffff88801c291000 RDI: ffff88801c291064
RBP: 000000000003a538 R08: ffff8880b9437ccb R09: 1ffff11017286f99
R10: dffffc0000000000 R11: ffffffff8b7dd8e0 R12: ffff888015185800
R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eabf080
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbd10356b8 CR3: 0000000019b8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:702
cpuidle_enter_state+0x112/0x480 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x375/0x5d0 kernel/sched/idle.c:332
cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:430
rest_init+0x2dc/0x300 init/main.c:747
start_kernel+0x47a/0x500 init/main.c:1103
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:488
common_startup_64+0x13e/0x147