bridge0: port 2(bridge_slave_1) entered forwarding state
bridge0: topology change detected, propagating
bridge0: port 1(bridge_slave_0) entered forwarding state
bridge0: topology change detected, propagating
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17061/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=115793, q=554 ncpus=2)
task:syz.5.3002 state:R running task stack:25336 pid:17061 tgid:17054 ppid:10003 task_flags:0x40044c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7556
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa00 kernel/entry/common.c:167
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:679
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 bb ef 4e 12 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 06 a1 16 0f 0f 82 ac 02 00 00 8b 35 ce d4 16 0f 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 5d ef 4e 12 0f 85 ec 02 00 00 48 83 c4
RSP: 0018:ffffc900057beb30 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e137bfb RDI: ffffffff8c3e9b80
RBP: ffffffff8e9e60c0 R08: 00000000a0f308ed 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:840 [inline]
class_rcu_constructor include/linux/rcupdate.h:1183 [inline]
unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495
__unwind_start+0x3cd/0x7e0 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0x73/0xf0 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x162/0x1e0 mm/page_owner.c:165
__reset_page_owner+0x84/0x190 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
folios_put_refs+0x585/0xaa0 mm/swap.c:1057
folio_batch_release include/linux/folio_batch.h:101 [inline]
shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1149
shmem_truncate_range mm/shmem.c:1277 [inline]
shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1407
evict+0x3c2/0xad0 fs/inode.c:825
iput_final fs/inode.c:2019 [inline]
iput.part.0+0x989/0x1050 fs/inode.c:2068
iput+0x35/0x40 fs/inode.c:2034
dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
dentry_kill+0x25d/0xc20 fs/dcache.c:826
shrink_kill fs/dcache.c:1275 [inline]
shrink_dentry_list+0x1e8/0x310 fs/dcache.c:1292
shrink_dcache_tree+0x201/0x400 fs/dcache.c:1759
do_one_tree fs/dcache.c:1795 [inline]
shrink_dcache_for_umount+0x101/0x6c0 fs/dcache.c:1812
generic_shutdown_super+0x7e/0x360 fs/super.c:625
kill_anon_super+0x3a/0x60 fs/super.c:1232
deactivate_locked_super+0xc1/0x1b0 fs/super.c:477
deactivate_super fs/super.c:510 [inline]
deactivate_super+0xe7/0x110 fs/super.c:506
cleanup_mnt+0x21f/0x450 fs/namespace.c:1317
task_work_run+0x150/0x240 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x951/0x2ae0 kernel/exit.c:1004
do_group_exit+0xd5/0x2a0 kernel/exit.c:1147
get_signal+0x1ec7/0x21e0 kernel/signal.c:3038
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x6f0 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x666/0x870 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0102d9ce59
RSP: 002b:00007f0103c8a028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f0103016090 RCX: 00007f0102d9ce59
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f0102e32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0103016128 R14: 00007f0103016090 R15: 00007ffed2437b58
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g115793 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=63380
rcu: rcu_preempt kthread starved for 10502 jiffies! g115793 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:28984 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x125c/0x6730 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
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: 18094 Comm: syz.0.3211 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:229 [inline]
RIP: 0010:__lock_acquire+0xd86/0x1a40 kernel/locking/lockdep.c:5233
Code: c7 f8 ff ff be fe ff ff ff ba ff ff ff ff bf ff ff ff ff c7 44 24 48 01 00 00 00 41 b8 ff ff ff ff e9 92 f7 ff ff 0f b7 43 f8 <66> 25 ff 1f 0f b7 c0 48 0f a3 05 5b c6 55 14 0f 83 b2 02 00 00 48
RSP: 0018:ffffc90000007c98 EFLAGS: 00000002
RAX: 0000000000000038 RBX: ffff888034310c40 RCX: 0000000000000000
RDX: 00000000fc3af7d7 RSI: 00000000c603d25a RDI: 000000001a0ddaca
RBP: ffff888034310000 R08: 00000000ffffffff R09: 0000000000000f36
R10: 0000000000000004 R11: 0000000000000000 R12: 38dc0a14a830ef67
R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f1575a656c0(0000) GS:ffff8881240e0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6824dc1ff8 CR3: 000000003b6df000 CR4: 00000000003526f0
Call Trace:
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
spin_lock include/linux/spinlock.h:342 [inline]
advance_sched+0xe5/0xd20 net/sched/sch_taprio.c:930
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213
Code: 64 00 be 03 00 00 00 5b e9 52 26 f8 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 05 80 2a 12 <48> 8b 34 24 65 48 8b 15 e1 7f 2a 12 a9 00 01 ff 00 74 1b f6 c4 01
RSP: 0018:ffffc90003c069a0 EFLAGS: 00000202
RAX: 0000000080000001 RBX: ffffea0001438e01 RCX: ffffffff8265ca0b
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff888034310000
RBP: ffffea0001438e00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88802be36c80 R14: 0000000000000000 R15: ffffea0001438e30
folio_test_anon include/linux/page-flags.h:718 [inline]
__folio_mod_stat mm/rmap.c:1335 [inline]
__folio_remove_rmap mm/rmap.c:1873 [inline]
folio_remove_rmap_ptes+0x754/0xdd0 mm/rmap.c:1900
try_to_unmap_one+0x1bd6/0x3900 mm/rmap.c:2348
rmap_walk_anon+0x49c/0x870 mm/rmap.c:3001
rmap_walk mm/rmap.c:3106 [inline]
rmap_walk mm/rmap.c:3101 [inline]
try_to_unmap+0x172/0x1c0 mm/rmap.c:2406
shrink_folio_list+0x2062/0x60a0 mm/vmscan.c:1347
reclaim_folio_list+0xdc/0x5d0 mm/vmscan.c:2171
reclaim_pages+0x428/0x5e0 mm/vmscan.c:2208
madvise_cold_or_pageout_pte_range+0x155c/0x2620 mm/madvise.c:563
walk_pmd_range mm/pagewalk.c:148 [inline]
walk_pud_range mm/pagewalk.c:239 [inline]
walk_p4d_range mm/pagewalk.c:280 [inline]
walk_pgd_range+0xc1a/0x1dd0 mm/pagewalk.c:321
__walk_page_range+0x171/0x850 mm/pagewalk.c:429
walk_page_range_vma_unsafe+0x209/0x8f0 mm/pagewalk.c:733
walk_page_range_vma+0x63/0x90 mm/pagewalk.c:743
madvise_pageout_page_range mm/madvise.c:622 [inline]
madvise_pageout+0x259/0x540 mm/madvise.c:647
madvise_vma_behavior+0x452/0x2240 mm/madvise.c:1358
madvise_walk_vmas+0x2fe/0xa90 mm/madvise.c:1713
madvise_do_behavior+0x1ea/0x510 mm/madvise.c:1908
do_madvise+0x238/0x290 mm/madvise.c:2006
__do_sys_madvise mm/madvise.c:2015 [inline]
__se_sys_madvise mm/madvise.c:2013 [inline]
__x64_sys_madvise+0xa9/0x110 mm/madvise.c:2013
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1574b9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1575a65028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f1574e16090 RCX: 00007f1574b9ce59
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007f1574c32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1574e16128 R14: 00007f1574e16090 R15: 00007ffdd0589208