bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4992/1:b..l P5619/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=26481, q=1597 ncpus=2)
task:syz-executor state:R running task stack:24312 pid:5619 tgid:5619 ppid:5612 task_flags:0x40050c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7370
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
zap_pte_range mm/memory.c:1948 [inline]
zap_pmd_range mm/memory.c:2004 [inline]
zap_pud_range mm/memory.c:2032 [inline]
zap_p4d_range mm/memory.c:2053 [inline]
__zap_vma_range+0x3d17/0x4b40 mm/memory.c:2093
unmap_vmas+0x379/0x530 mm/memory.c:2162
exit_mmap+0x280/0x9e0 mm/mmap.c:1300
__mmput+0x118/0x430 kernel/fork.c:1178
exit_mm+0x1f6/0x2d0 kernel/exit.c:582
do_exit+0x6a2/0x22c0 kernel/exit.c:964
do_group_exit+0x21b/0x2d0 kernel/exit.c:1119
get_signal+0x1284/0x1330 kernel/signal.c:3037
arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98
__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:238 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd17157fd7
RSP: 002b:00007ffd8b720c20 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 000055558c24b500 RCX: 00007fbd17157fd7
RDX: 0000000040000000 RSI: 00007ffd8b720c7c RDI: ffffffffffffffff
RBP: 00007ffd8b720c7c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffd8b720ed8 R15: 0000000000000000
task:udevd state:R running task stack:23288 pid:4992 tgid:4992 ppid:1 task_flags:0x400140 flags:0x00080800
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x14f/0x760 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 f1 1d 07 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 db a8 97 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 40 11 0a 0a cc 48 8d 3d 88 63 92
RSP: 0018:ffffc9000301f1d8 EFLAGS: 00000286
RAX: b5175134b7a2ce00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000118ec354 RSI: ffffffff8e21a1b7 RDI: ffffffff8c28af60
RBP: ffffffff8176f256 R08: ffffffff8176f256 R09: ffffffff8e95cda0
R10: ffffc9000301f348 R11: fffff52000603e75 R12: 0000000000000002
R13: ffffffff8e95cda0 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
class_rcu_constructor include/linux/rcupdate.h:1181 [inline]
unwind_next_frame+0xc3/0x2550 arch/x86/kernel/unwind_orc.c:495
__unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:787
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1402 [inline]
__free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2943
__slab_free+0x274/0x2c0 mm/slub.c:5612
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_kmalloc+0x22/0xb0 mm/kasan/common.c:406
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5419
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
kernfs_get_open_node fs/kernfs/file.c:543 [inline]
kernfs_fop_open+0x862/0xda0 fs/kernfs/file.c:718
do_dentry_open+0x785/0x14e0 fs/open.c:947
vfs_open+0x3b/0x340 fs/open.c:1079
do_open fs/namei.c:4699 [inline]
path_openat+0x2e08/0x3860 fs/namei.c:4858
do_file_open+0x23e/0x4a0 fs/namei.c:4887
do_sys_openat2+0x113/0x200 fs/open.c:1364
do_sys_open fs/open.c:1370 [inline]
__do_sys_openat fs/open.c:1386 [inline]
__se_sys_openat fs/open.c:1381 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1381
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f40b2ca7407
RSP: 002b:00007ffcf4ae7b80 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f40b340f880 RCX: 00007f40b2ca7407
RDX: 0000000000080000 RSI: 00007ffcf4ae7d00 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000556ddc30d7f5
R13: 0000556ddc30d7f5 R14: 0000000000000001 R15: 00007ffcf4aec360
rcu: rcu_preempt kthread starved for 10167 jiffies! g26481 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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5738 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events ovs_dp_masks_rebalance
RIP: 0010:__bfs kernel/locking/lockdep.c:1815 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3908 [inline]
RIP: 0010:__lock_acquire+0x1978/0x2cf0 kernel/locking/lockdep.c:5237
Code: de 65 a0 14 25 ff 0f 00 00 39 05 9f 65 9f 12 73 06 89 05 97 65 9f 12 48 8b 02 48 89 df 4c 39 e8 0f 84 2c fe ff ff 4c 89 60 30 <48> 8b 00 4c 39 e8 75 f4 48 89 df e9 18 fe ff ff 48 89 fb 48 c7 c7
RSP: 0018:ffffc900045ef410 EFLAGS: 00000002
RAX: ffffffff96d2a588 RBX: 0000000000000111 RCX: 0000000000000002
RDX: ffffffff96c4ca48 RSI: ffff88802cc78c30 RDI: 0000000000000111
RBP: 3fd0d59606c89f5f R08: ffffc900045ef3d8 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff81a22380 R12: ffffc900045ef4a0
R13: ffffffff93e26730 R14: ffff88802cc78000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88812538a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd1809eff8 CR3: 000000007d408000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
lock_hrtimer_base kernel/time/hrtimer.c:191 [inline]
hrtimer_try_to_cancel+0x223/0x670 kernel/time/hrtimer.c:1524
update_curr_dl_se+0x307/0x1260 kernel/sched/deadline.c:1482
update_curr+0x1fa/0x4e0 kernel/sched/fair.c:1441
enqueue_entity kernel/sched/fair.c:5534 [inline]
enqueue_task_fair+0x442/0x2aa0 kernel/sched/fair.c:7252
enqueue_task+0x75/0x410 kernel/sched/core.c:2165
activate_task kernel/sched/core.c:2205 [inline]
ttwu_do_activate+0x1cc/0x660 kernel/sched/core.c:3725
ttwu_queue kernel/sched/core.c:3978 [inline]
try_to_wake_up+0x724/0x1380 kernel/sched/core.c:4302
wake_up_process kernel/sched/core.c:4434 [inline]
wake_up_q+0x85/0xd0 kernel/sched/core.c:1158
raw_spin_unlock_irqrestore_wake include/linux/sched/wake_q.h:99 [inline]
__mutex_unlock_slowpath+0x648/0x6f0 kernel/locking/mutex.c:1029
ovs_unlock net/openvswitch/datapath.c:113 [inline]
ovs_dp_masks_rebalance+0x93/0xe0 net/openvswitch/datapath.c:2595
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
net_ratelimit: 13481 callbacks suppressed
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 18488 callbacks suppressed
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:7a:50:c5:1f:c4:eb, vlan:0)