rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P29195/1:b..l
rcu: (detected by 0, t=10684 jiffies, g=166205, q=2331 ncpus=2)
task:syz.4.6274 state:R running task stack:24968 pid:29195 tgid:29195 ppid:28464 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7463
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x41/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
insert_page+0x2db/0x440 mm/memory.c:2539
kcov_mmap+0xc9/0x140 kernel/kcov.c:527
vfs_mmap include/linux/fs.h:2064 [inline]
mmap_file mm/internal.h:238 [inline]
__mmap_new_file_vma mm/vma.c:2618 [inline]
__mmap_new_vma mm/vma.c:2691 [inline]
__mmap_region mm/vma.c:2904 [inline]
mmap_region+0x1bfc/0x25b0 mm/vma.c:2989
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd02b39df42
RSP: 002b:00007ffc9d1bbd88 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fd0291f6000 RCX: 00007fd02b39df42
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007fd0291f6000
RBP: 0000000000000011 R08: 00000000000000db R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000206 R12: 0000000000000003
R13: 0000000000000005 R14: 0000000000000000 R15: 00007fd02b625fa0
rcu: rcu_preempt kthread starved for 4369 jiffies! g166205 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27488 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x17db/0x58f0 kernel/sched/core.c:7284
__schedule_loop kernel/sched/core.c:7361 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7376
schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
kthread+0x38b/0x480 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: 20799 Comm: kworker/R-bond6 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Workqueue: 0x0 (bond6)
RIP: 0010:match_held_lock+0x2/0x120 kernel/locking/lockdep.c:5356
Code: 0f b9 3a 90 31 db 48 89 d8 5b 41 5e 41 5f e9 15 00 03 00 cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 53 bb 01 00 00 00 48 39 77 10 0f 84 c6 00 00 00 0f b7 47 22
RSP: 0018:ffffc90000a17518 EFLAGS: 00000006
RAX: 0000000000000005 RBX: 0000000000000014 RCX: 8000000000000101
RDX: 8000000000000100 RSI: ffff8880b8528298 RDI: ffff888050c7cad0
RBP: ffff888050c7cad0 R08: 0000000000000100 R09: 0000000000000001
R10: 0000000000000003 R11: ffffffff81756510 R12: 0000000000000004
R13: 0000000000000004 R14: ffff8880b8528298 R15: ffff888050c7be80
FS: 0000000000000000(0000) GS:ffff888123bbf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd02c282ff8 CR3: 000000007f4d6000 CR4: 00000000003526f0
Call Trace:
find_held_lock kernel/locking/lockdep.c:5401 [inline]
__lock_release kernel/locking/lockdep.c:5588 [inline]
lock_release+0x10c/0x3c0 kernel/locking/lockdep.c:5964
__raw_spin_unlock include/linux/spinlock_api_smp.h:199 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:213
hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:58 [inline]
hrtimer_rearm_deferred include/linux/hrtimer_rearm.h:67 [inline]
irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:505 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline]
irqentry_exit+0x8d9/0x920 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 20 2e 45 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 82 a8 f2 12 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 37 44 da
RSP: 0018:ffffc90000a176a0 EFLAGS: 00000296
RAX: 81fb2111753e4100 RBX: 0000000000000000 RCX: 8000000000000100
RDX: 000000004dbb4af1 RSI: ffffffff8e6f16e9 RDI: ffffffff8c6dd880
RBP: ffff888050c7be80 R08: ffffffff817811df R09: 0000000000000000
R10: ffffc90000a177d8 R11: ffffffff81b2c4a0 R12: ffffffff8fd5c8a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:264 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2748 [inline]
slab_free mm/slub.c:6509 [inline]
kmem_cache_free+0x182/0x650 mm/slub.c:6636
skb_ext_del include/linux/skbuff.h:5116 [inline]
nf_bridge_info_free net/bridge/br_netfilter_hooks.c:157 [inline]
br_nf_dev_queue_xmit+0x4f6/0x25c0 net/bridge/br_netfilter_hooks.c:856
NF_HOOK+0x64e/0x6e0 include/linux/netfilter.h:325
br_nf_post_routing+0xa51/0xee0 net/bridge/br_netfilter_hooks.c:964
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK+0x23e/0x3f0 include/linux/netfilter.h:323
br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1165 [inline]
br_nf_forward_finish+0xa76/0xea0 net/bridge/br_netfilter_hooks.c:667
NF_HOOK+0x64e/0x6e0 include/linux/netfilter.h:325
br_nf_forward_ip+0x7e7/0xa30 net/bridge/br_netfilter_hooks.c:721
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:619
nf_hook include/linux/netfilter.h:280 [inline]
NF_HOOK+0x23e/0x3f0 include/linux/netfilter.h:323
__br_forward+0x397/0x540 net/bridge/br_forward.c:115
br_handle_frame_finish+0x1119/0x1950 net/bridge/br_input.c:229
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0x90c/0xc40 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:325 [inline]
br_nf_pre_routing_ipv6+0x382/0x6f0 net/bridge/br_netfilter_ipv6.c:183
nf_hook_entry_hookfn include/linux/netfilter.h:165 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x1329/0x1600 net/bridge/br_input.c:451
__netif_receive_skb_core+0x989/0x30c0 net/core/dev.c:6184
__netif_receive_skb_one_core net/core/dev.c:6295 [inline]
__netif_receive_skb net/core/dev.c:6410 [inline]
process_backlog+0x727/0x18b0 net/core/dev.c:6761
__napi_poll+0xaa/0x330 net/core/dev.c:7830
napi_poll net/core/dev.c:7893 [inline]
net_rx_action+0x61d/0xf50 net/core/dev.c:8050
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:sched_update_worker kernel/sched/core.c:7351 [inline]
RIP: 0010:schedule+0x1ca/0x2b0 kernel/sched/core.c:7377
Code: 16 48 89 df a8 20 75 1f 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e9 b2 f0 f8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 5b 41 5c <41> 5d 41 5e 41 5f 5d e9 3a 82 a4 f5 90 0f 0b 90 e9 87 fe ff ff 90
RSP: 0018:ffffc9000a5d7cc8 EFLAGS: 00000202
RAX: 0000000004208060 RBX: 0000000000000008 RCX: ffffffff9b9f5501
RDX: 0000000000000001 RSI: ffffffff8c6dd860 RDI: ffff888050c7be80
RBP: 1ffff1100a18f7d3 R08: ffffffff917a717f R09: 1ffffffff22f4e2f
R10: dffffc0000000000 R11: fffffbfff22f4e30 R12: ffff888029c21768
R13: dffffc0000000000 R14: ffff888050c7beac R15: ffff888050c7d1c8
rescuer_thread+0xf7f/0x10e0 kernel/workqueue.c:3752
kthread+0x38b/0x480 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