rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1002/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=11809, q=643 ncpus=2)
task:kworker/u4:5 state:R running task stack:21712 pid:1002 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
preempt_schedule_irq+0xb5/0x140 kernel/sched/core.c:7009
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:check_region_inline mm/kasan/generic.c:169 [inline]
RIP: 0010:kasan_check_range+0x10/0x290 mm/kasan/generic.c:187
Code: c0 c3 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc 66 0f 1f 00 b0 01 48 85 f6 0f 84 b8 01 00 00 55 <41> 57 41 56 41 55 41 54 53 4c 8d 04 37 49 39 f8 0f 82 5a 02 00 00
RSP: 0018:ffffc900041aeb78 EFLAGS: 00000202
RAX: ffffffff81b67201 RBX: ffffea0001d45600 RCX: ffffffff81b67288
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea0001d45600
RBP: ffffc900041aed38 R08: ffff8880785a1a07 R09: 1ffff1100f0b4340
R10: dffffc0000000000 R11: ffffed100f0b4341 R12: 1ffffd40003a8ac1
R13: 0000000000000000 R14: ffffea0001d45608 R15: dffffc0000000000
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
folio_test_swapbacked include/linux/page-flags.h:515 [inline]
folio_test_swapcache include/linux/page-flags.h:564 [inline]
folio_index+0x68/0x300 include/linux/pagemap.h:796
__folio_start_writeback+0x1d5/0xf80 mm/page-writeback.c:3019
ext4_bio_write_folio+0xedc/0x2250 fs/ext4/page-io.c:566
mpage_submit_folio+0x237/0x3c0 fs/ext4/inode.c:1908
mpage_map_and_submit_buffers fs/ext4/inode.c:2154 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2293 [inline]
ext4_do_writepages+0x1d01/0x38d0 fs/ext4/inode.c:2718
ext4_writepages+0x1a8/0x2f0 fs/ext4/inode.c:2807
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 10548 jiffies! g11809 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27752 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
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:
CPU: 1 PID: 6009 Comm: syz.1.32 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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 47 61 18 03 0f 1f 80 00 00 00
RSP: 0018:ffffc900037d7cb8 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: 0000000000000200 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: ffffc900037d7c27 R09: 1ffff920006faf84
R10: dffffc0000000000 R11: fffff520006faf85 R12: ffff8880b8f35201
R13: dffffc0000000000 R14: ffff8880b8f35290 R15: 0000000000000020
FS: 00007f3ea813b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000060e30000 CR4: 00000000003506e0
Call Trace:
__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: 0033:0x7f3ea732add9
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:00007f3ea813ab40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f3ea75b5fa8 RCX: 00007f3ea732add9
RDX: 00007f3ea813ab40 RSI: 00007f3ea813ac70 RDI: 0000000000000011
RBP: 00007f3ea75b5fa0 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ea75b6038 R14: 00007ffe02c4cf70 R15: 00007ffe02c4d058
sched: RT throttling activated