rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5922/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=19513, q=633 ncpus=2)
task:kworker/0:3 state:R running task stack:24872 pid:5922 tgid:5922 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: mld mld_dad_work
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 3b 92 2e 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 46 b0 f6 0e 0f 82 a4 02 00 00 8b 35 ce e3 f6 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 dd 91 2e 12 0f 85 ed 02 00 00 48 83 c4
RSP: 0018:ffffc9000396f928 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000003
RDX: 0000000000000000 RSI: ffffffff8df33fcc RDI: ffffffff8c1c1f00
RBP: ffffffff8e7e5460 R08: 00000000a0a886f9 R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
mld_newpack.isra.0+0x368/0xa20 net/ipv6/mcast.c:1783
add_grhead+0x299/0x340 net/ipv6/mcast.c:1886
add_grec+0x1380/0x1920 net/ipv6/mcast.c:2025
mld_send_initial_cr+0x156/0x320 net/ipv6/mcast.c:2268
mld_dad_work+0x32/0x1f0 net/ipv6/mcast.c:2294
process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302
process_scheduled_works kernel/workqueue.c:3385 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g19513 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=5010
rcu: rcu_preempt kthread starved for 10502 jiffies! g19513 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27848 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x10e9/0x6820 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:7282
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2297
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6505 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213
Code: 61 00 be 03 00 00 00 5b e9 22 49 f0 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 45 75 0a 12 <48> 8b 34 24 65 48 8b 15 21 75 0a 12 a9 00 01 ff 00 74 1b f6 c4 01
RSP: 0018:ffffc90000007d60 EFLAGS: 00000087
RAX: 0000000080010001 RBX: ffff888079689080 RCX: ffffffff89a1db43
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff888029c52500
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888079689000 R14: 0000000000010000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881242e1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5867e83270 CR3: 0000000073f05000 CR4: 00000000003526f0
Call Trace:
taprio_set_budgets+0x12b/0x310 net/sched/sch_taprio.c:676
advance_sched+0x5f6/0xc80 net/sched/sch_taprio.c:983
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_is_held_type+0xf5/0x140 kernel/locking/lockdep.c:5945
Code: ff ff ff ff 65 0f c1 15 f1 15 7a 08 83 fa 01 8b 44 24 04 75 2d 9c 5a 80 e6 02 75 47 41 f7 c5 00 02 00 00 74 01 fb 48 83 c4 08 <5b> 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e9 17 39 03 00 31 c0
RSP: 0018:ffffc90003467188 EFLAGS: 00000286
RAX: 0000000000000001 RBX: ffff888079d28338 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8df33fcc RDI: ffffffff8c1c1f00
RBP: ffff888029c52500 R08: 0000000000000005 R09: 0000000000000300
R10: 0000000000000300 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000246 R14: ffff888029c53090 R15: 0000000000000000
lock_is_held include/linux/lockdep.h:249 [inline]
mt_locked lib/maple_tree.c:708 [inline]
mt_slot lib/maple_tree.c:715 [inline]
mas_next_slot+0xa18/0x1960 lib/maple_tree.c:4173
mas_find+0x2ad/0x740 lib/maple_tree.c:5389
vma_next include/linux/mm.h:1596 [inline]
validate_mm+0x11d/0x4e0 mm/vma.c:653
vms_complete_munmap_vmas+0x83b/0xdd0 mm/vma.c:1364
__mmap_complete mm/vma.c:2617 [inline]
__mmap_region+0xb54/0x2da0 mm/vma.c:2780
mmap_region+0x35d/0x620 mm/vma.c:2856
do_mmap+0xc63/0x12f0 mm/mmap.c:560
vm_mmap_pgoff+0x29e/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:606
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a7efad242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffe6ba323e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f6a7eccc000 RCX: 00007f6a7efad242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f6a7eccc000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000004000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffe6ba324a8
R13: 00007f6a7ef82050 R14: 00007ffe6ba32820 R15: 00000fffcd746480