rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6374/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=15393, q=790 ncpus=2)
task:syz-executor state:R running task stack:24088 pid:6374 tgid:6374 ppid:6366 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
irqentry_exit+0x36/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x576/0x20a0 arch/x86/kernel/unwind_orc.c:512
Code: c1 ea 03 0f b6 14 02 0f b6 04 06 4c 89 c6 83 e6 07 40 38 f2 40 0f 9e c6 84 d2 0f 95 c2 40 84 d6 0f 85 c8 14 00 00 41 83 e7 07 <44> 38 f8 0f 9e c2 84 c0 0f 95 c0 84 c2 0f 85 b1 14 00 00 4c 89 f2
RSP: 0018:ffffc90003537180 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff91e9a592
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff912cdf3c
RBP: ffffc90003537238 R08: ffffffff91e9a596 R09: 0000000000000000
R10: 0000000000000002 R11: 000000000009ce00 R12: ffffc90003537240
R13: ffffc900035371f0 R14: ffffc90003537225 R15: 0000000000000007
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
sctp_inetaddr_event+0x3b0/0x6d0 net/sctp/protocol.c:808
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
blocking_notifier_call_chain kernel/notifier.c:380 [inline]
blocking_notifier_call_chain+0x69/0xa0 kernel/notifier.c:368
__inet_insert_ifa+0x925/0xcd0 net/ipv4/devinet.c:567
inet_rtm_newaddr+0xd87/0x1540 net/ipv4/devinet.c:1002
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6946
netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg net/socket.c:729 [inline]
__sys_sendto+0x4a0/0x520 net/socket.c:2228
__do_sys_sendto net/socket.c:2235 [inline]
__se_sys_sendto net/socket.c:2231 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2231
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb499390a7c
RSP: 002b:00007fff3ce6ad90 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fb49a0e4620 RCX: 00007fb499390a7c
RDX: 0000000000000028 RSI: 00007fb49a0e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fff3ce6ade4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fb49a0e4670 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10506 jiffies! g15393 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:27368 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6588 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:lock_is_held_type+0x6/0x150 kernel/locking/lockdep.c:5925
Code: 0f 0b 90 90 eb e0 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 <41> 56 41 55 41 bd ff ff ff ff 41 54 55 53 48 83 ec 08 8b 0d 36 ce
RSP: 0018:ffffc90003c8fa50 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 1ffff92000791f4e RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8e5c1160
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8ba6b8e0
R13: 000000000000008e R14: ffff88803001e204 R15: ffff88803001c880
FS: 00007f304d4796c0(0000) GS:ffff8881246b9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 000000005c73f000 CR4: 00000000003526f0
Call Trace:
lock_is_held include/linux/lockdep.h:249 [inline]
__might_resched+0x4ca/0x5e0 kernel/sched/core.c:8919
__might_fault+0x83/0x190 mm/memory.c:6956
__copy_to_user include/linux/uaccess.h:142 [inline]
save_xstate_epilog arch/x86/kernel/fpu/signal.c:121 [inline]
copy_fpstate_to_sigframe+0x84f/0xaf0 arch/x86/kernel/fpu/signal.c:232
get_sigframe+0x4a8/0x9c0 arch/x86/kernel/signal.c:163
x64_setup_rt_frame+0x12e/0xcf0 arch/x86/kernel/signal_64.c:175
setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
handle_signal arch/x86/kernel/signal.c:294 [inline]
arch_do_signal_or_restart+0x5e4/0x7d0 arch/x86/kernel/signal.c:339
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f304c58ebe7
Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89
RSP: 002b:00007f304d4790e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 00000000000000ca RBX: 00007f304c7b5fa8 RCX: 00007f304c58ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f304c7b5fa8
RBP: 00007f304c7b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f304c7b6038 R14: 00007ffef32b65f0 R15: 00007ffef32b66d8