rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4260/1:b..l
(detected by 1, t=10503 jiffies, g=8785, q=76 ncpus=2)
task:syz-executor236 state:R running task stack:25920 pid:4260 ppid:4255 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc90003d67480 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 75c24ad516f25b00
RDX: 0000000000000000 RSI: ffffffff8a6c0f80 RDI: ffffffff8abf0da0
RBP: ffffc90003d67598 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: 0000000000000001
R13: 1ffff920007ace9c R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
is_bpf_text_address+0x43/0x2a0 kernel/bpf/core.c:735
kernel_text_address+0x9c/0xd0 kernel/extable.c:125
__kernel_text_address+0x9/0x30 kernel/extable.c:79
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
kmem_cache_free+0xf7/0x290 mm/slub.c:3683
kern_path+0x3b/0x50 fs/namei.c:2608
tomoyo_mount_acl security/tomoyo/mount.c:136 [inline]
tomoyo_mount_permission+0x75f/0x940 security/tomoyo/mount.c:237
security_sb_mount+0x83/0xb0 security/security.c:993
path_mount+0xb8/0x1010 fs/namespace.c:3329
do_mount fs/namespace.c:3400 [inline]
__do_sys_mount fs/namespace.c:3608 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3585
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe9408efcea
RSP: 002b:00007fff699bc1f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe9409460ae RCX: 00007fe9408efcea
RDX: 0000000000000000 RSI: 00007fe940946181 RDI: 00007fe940946192
RBP: 00007fe940946181 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000045001 R11: 0000000000000246 R12: 00007fe94094c33c
R13: 00007fe940946106 R14: 0000000000000001 R15: 0000000000000001
rcu: rcu_preempt kthread starved for 10557 jiffies! g8785 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:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4280 Comm: syz-executor236 Not tainted 6.1.136-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:216
Code: 48 8b 3d 80 c0 7d 0c 48 89 de 5b e9 17 aa 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d 94 ab 81 7e 65 8b 15 95 ab 81 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00
RSP: 0018:ffffc90003e27ac8 EFLAGS: 00000046
RAX: ffffffff814ffb08 RBX: ffff88803022bb80 RCX: ffff88803022bb80
RDX: 0000000080000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1006045771
R10: ffffed1006045771 R11: 1ffff11006045770 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88803022c0f0 R15: ffff88802969a908
FS: 0000555591a693c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe940945448 CR3: 00000000790e4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
freezing include/linux/freezer.h:36 [inline]
recalc_sigpending+0x158/0x1c0 kernel/signal.c:184
__set_task_blocked kernel/signal.c:3031 [inline]
__set_current_blocked+0x1f8/0x240 kernel/signal.c:3059
set_current_blocked kernel/signal.c:3044 [inline]
signal_delivered kernel/signal.c:2907 [inline]
signal_setup_done+0x28c/0x440 kernel/signal.c:2919
handle_signal arch/x86/kernel/signal.c:846 [inline]
arch_do_signal_or_restart+0xeba/0x1230 arch/x86/kernel/signal.c:873
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe940914d90
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 1a 2a 03 00 e8 d5 06 fb ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fff699bba38 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000004
RDX: 00007fff699bba40 RSI: 00007fff699bbb70 RDI: 0000000000000021
RBP: 00007fe940977130 R08: 00007fe9408ae990 R09: 00007fe9408ae990
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fe940979dc8
R13: 0000000000000000 R14: 00007fe940979de0 R15: 00007fe9408b9f80
sched: RT throttling activated