rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5429/1:b..l P5308/1:b..l
(detected by 0, t=10502 jiffies, g=14945, q=70 ncpus=2)
task:kworker/u4:20 state:R running task stack:26400 pid:5308 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 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:__sanitizer_cov_trace_const_cmp4+0x0/0x80 kernel/kcov.c:314
Code: 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 03 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 <48> 8b 04 24 65 48 8b 15 f4 a4 81 7e 65 8b 0d f5 a4 81 7e 81 e1 00
RSP: 0018:ffffc9001c45fbd8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff888030bad940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88807cba0b20 R08: dffffc0000000000 R09: fffffbfff215ba49
R10: fffffbfff215ba49 R11: 1ffffffff215ba48 R12: dffffc0000000000
R13: ffffffff89e0239e R14: ffff88807e5e4c80 R15: 0000000000000164
rcu_read_lock include/linux/rcupdate.h:792 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xff/0x600 net/batman-adv/network-coding.c:719
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
task:dhcpcd state:R running task stack:24960 pid:5429 ppid:3932 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:244 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0x80 kernel/kcov.c:313
Code: 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 03 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 48 8b 04 24 <65> 48 8b 15 f4 a4 81 7e 65 8b 0d f5 a4 81 7e 81 e1 00 01 ff 00 74
RSP: 0018:ffffc9000347f718 EFLAGS: 00000202
RAX: ffffffff8a03e3a8 RBX: ffff88802f3eca10 RCX: ffff888030aa9dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003
RBP: ffffc9000347f8f0 R08: ffff888030aa9dc0 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 00007f6d4c12bfff
R13: ffff88802f3eca00 R14: 0000000000000001 R15: 0000000000000001
ma_slots lib/maple_tree.c:793 [inline]
mas_get_slot lib/maple_tree.c:6678 [inline]
mas_validate_gaps lib/maple_tree.c:-1 [inline]
mt_validate+0x2b18/0x4c90 lib/maple_tree.c:7244
validate_mm_mt+0xcd/0x420 mm/mmap.c:294
validate_mm+0xcc/0x2b0 mm/mmap.c:331
remove_mt mm/mmap.c:2318 [inline]
do_mas_align_munmap+0xf98/0x1220 mm/mmap.c:2591
do_mas_munmap+0x240/0x2b0 mm/mmap.c:2646
__vm_munmap+0x18d/0x290 mm/mmap.c:2932
__do_sys_munmap mm/mmap.c:2957 [inline]
__se_sys_munmap mm/mmap.c:2954 [inline]
__x64_sys_munmap+0x5c/0x70 mm/mmap.c:2954
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: 0033:0x7f6d4c3332e7
RSP: 002b:00007ffd9ebc96b8 EFLAGS: 00000202 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000557074e0af00 RCX: 00007f6d4c3332e7
RDX: 0000000000000001 RSI: 000000000002f6d0 RDI: 00007f6d4c0cd000
RBP: 00007ffd9ebc97c0 R08: 00000000000004f0 R09: 0000000000000002
R10: 00007ffd9ebc95f0 R11: 0000000000000202 R12: 00007ffd9ebc9700
R13: 00007f6d4c346000 R14: 0000557074e0af00 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10560 jiffies! g14945 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+0x10ec/0x40b0 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:
CPU: 0 PID: 5417 Comm: syz.3.302 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 2e 31 43 f7 48 89 df e8 86 f6 43 f7 e8 91 e8 66 f7 fb bf 01 00 00 00 36 74 37 f7 65 8b 05 07 35 e2 75 85 c0 74 02 5b c3 e8 54 46 e0
RSP: 0018:ffffc900036bfbb8 EFLAGS: 00000286
RAX: 959adcb991599300 RBX: ffff8880555b1280 RCX: 959adcb991599300
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: 0000000000000001
RBP: ffff8880555b1518 R08: dffffc0000000000 R09: ffffed100aab6251
R10: ffffed100aab6251 R11: 1ffff1100aab6250 R12: 1ffff1100aab62a3
R13: 0000000000000011 R14: dffffc0000000000 R15: 0000000000000000
FS: 000055555dc7e500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffe8 CR3: 0000000018341000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1163/0x1350 kernel/signal.c:2874
arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
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: 0033:0x7fecd684d9e9
Code: 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 fb 44 8d 56 04 4c 8d 0d 22 46 35 00 89 f0 4c 8d 05 19 26 35 00 89 c2 <81> e2 ff 1f 00 00 49 8b 0c d1 48 39 f1 74 28 48 85 c9 74 29 45 38
RSP: 002b:00007ffcf298c838 EFLAGS: 00000246
RAX: 000000008a01b7fe RBX: 00007fecd76e5720 RCX: 0000000000002cf0
RDX: 000000008a01b7fe RSI: ffffffff8a01b7fe RDI: 000000000000000c
RBP: ffffffff8a01b7fe R08: 00007fecd6ba0000 R09: 00007fecd6ba2000
R10: 000000008a01b802 R11: 000000000000000c R12: 000000000000000c
R13: 0000000000000000 R14: ffffffff8a01b9ea R15: 0000000000002cf0