rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1095/1:b..l P5142/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=10297, q=898 ncpus=2)
task:udevd state:R running task stack:25160 pid:5142 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x14e2/0x4580 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xab/0xc0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xfa/0x110 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x11f/0x190 kernel/sched/wait.c:213
sock_def_readable+0x1e1/0x430 net/core/sock.c:3329
__netlink_sendskb net/netlink/af_netlink.c:1270 [inline]
netlink_sendskb+0x9b/0x130 net/netlink/af_netlink.c:1276
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1891
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f588e2a7407
RSP: 002b:00007ffc1556e080 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f588ea58880 RCX: 00007f588e2a7407
RDX: 0000000000000000 RSI: 00007ffc1556e0e0 RDI: 0000000000000004
RBP: 0000557dce304a90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000b2
R13: 0000557dce2f19e0 R14: 0000000000000000 R15: 0000000000000000
task:kworker/u4:7 state:R running task stack:21712 pid:1095 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x14e2/0x4580 kernel/sched/core.c:6700
preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7010
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:PagePoisoned include/linux/page-flags.h:297 [inline]
RIP: 0010:page_to_nid include/linux/mm.h:1636 [inline]
RIP: 0010:page_zone include/linux/mm.h:1850 [inline]
RIP: 0010:folio_zone include/linux/mm.h:1860 [inline]
RIP: 0010:zone_stat_mod_folio include/linux/vmstat.h:439 [inline]
RIP: 0010:folio_clear_dirty_for_io+0x557/0xc30 mm/page-writeback.c:2932
Code: cd ff 49 bf 00 00 00 00 00 fc ff df 4d 85 f6 75 0e e8 3d dc cd ff 43 80 3c 3c 00 75 0f eb 15 e8 2f dc cd ff fb 43 80 3c 3c 00 <74> 08 48 89 df e8 3f 83 26 00 4c 8b 3b 48 c7 c7 ff ff ff ff 4c 89
RSP: 0018:ffffc9000455ece0 EFLAGS: 00000246
RAX: ffffffff81b7b9a1 RBX: ffffea0001cf5040 RCX: ffff888023529e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000455ede8 R08: ffffffff90d855c7 R09: 1ffffffff21b0ab8
R10: dffffc0000000000 R11: fffffbfff21b0ab9 R12: 1ffffd400039ea08
R13: 0000000000000001 R14: 0000000000000200 R15: dffffc0000000000
mpage_submit_folio+0x7d/0x3c0 fs/ext4/inode.c:1884
mpage_map_and_submit_buffers fs/ext4/inode.c:2149 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2288 [inline]
ext4_do_writepages+0x1d01/0x38d0 fs/ext4/inode.c:2713
ext4_writepages+0x1a8/0x2f0 fs/ext4/inode.c:2802
do_writepages+0x3a2/0x600 mm/page-writeback.c:2575
__writeback_single_inode+0x153/0xee0 fs/fs-writeback.c:1625
writeback_sb_inodes+0x77c/0xef0 fs/fs-writeback.c:1916
__writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:1987
wb_writeback+0x464/0xba0 fs/fs-writeback.c:2097
wb_check_old_data_flush fs/fs-writeback.c:2201 [inline]
wb_do_writeback fs/fs-writeback.c:2254 [inline]
wb_workfn+0xabc/0xe20 fs/fs-writeback.c:2282
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: rcu_preempt kthread starved for 10568 jiffies! g10297 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:27496 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x14e2/0x4580 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x160/0x280 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
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: 6019 Comm: syz.0.31 Not tainted 6.6.94-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x82/0x90 kernel/kcov.c:315
Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 8b 04 24
RSP: 0018:ffffc90000007810 EFLAGS: 00000006
RAX: ffffffff813abf63 RBX: 1ffff92000000f29 RCX: 0000000000010000
RDX: ffff8880264e9e00 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffff8880264e9e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000010000 R12: ffffc90000008000
R13: 1ffff92000000f2b R14: ffffc90000000000 R15: ffffc90000007948
FS: 00007fb2962ce6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc9e8581178 CR3: 000000005cfcb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
deref_stack_reg+0x93/0x240 arch/x86/kernel/unwind_orc.c:403
unwind_next_frame+0x1789/0x2970 arch/x86/kernel/unwind_orc.c:648
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
__sigqueue_alloc+0x40c/0x520 kernel/signal.c:438
__send_signal_locked+0x22f/0xe00 kernel/signal.c:1130
do_send_sig_info kernel/signal.c:1312 [inline]
group_send_sig_info+0x1fa/0x260 kernel/signal.c:1462
do_bpf_send_signal+0x7f/0x190 kernel/trace/bpf_trace.c:836
irq_work_single+0xd5/0x230 kernel/irq_work.c:221
irq_work_run_list kernel/irq_work.c:252 [inline]
irq_work_run+0x156/0x2e0 kernel/irq_work.c:261
__sysvec_irq_work+0x98/0x380 arch/x86/kernel/irq_work.c:22
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x9c/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:196
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 f3 0f 1e fa 89 f6 31 d2 e9 37 7c 19 03 0f 1f 80 00 00 00
RSP: 0018:ffffc90003787cb8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: ffffc90003787c27 R09: 1ffff920006f0f84
R10: dffffc0000000000 R11: fffff520006f0f85 R12: ffff8880b8e35201
R13: dffffc0000000000 R14: ffff8880b8e35290 R15: 0000000000000020
__apic_send_IPI_self arch/x86/include/asm/apic.h:454 [inline]
arch_irq_work_raise+0x68/0x70 arch/x86/kernel/irq_work.c:31
irq_work_queue+0x99/0x140 kernel/irq_work.c:124
bpf_send_signal_common+0x2b6/0x420 kernel/trace/bpf_trace.c:875
____bpf_send_signal kernel/trace/bpf_trace.c:884 [inline]
bpf_send_signal+0x19/0x20 kernel/trace/bpf_trace.c:882
bpf_prog_7ba5217f62dcd359+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
__bpf_prog_run include/linux/filter.h:612 [inline]
bpf_prog_run include/linux/filter.h:619 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
bpf_trace_run2+0x1d1/0x3c0 kernel/trace/bpf_trace.c:2361
__traceiter_sys_enter+0x2a/0x40 include/trace/events/syscalls.h:18
trace_sys_enter+0x69/0x80 include/trace/events/syscalls.h:18
syscall_trace_enter+0xf0/0x150 kernel/entry/common.c:81
do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:77
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb29532ab19
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007fb2962cdb40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fb2955b5fa8 RCX: 00007fb29532ab19
RDX: 00007fb2962cdb40 RSI: 00007fb2962cdc70 RDI: 0000000000000011
RBP: 00007fb2955b5fa0 R08: 0000000000745a08 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 00007fb2955b5fac
R13: 0000000000000000 R14: 00007ffc56169d30 R15: 00007ffc56169e18
sched: RT throttling activated