[v6.1] INFO: rcu detected stall in call_timer_fn (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 090666d3cc90 Linux 6.1.177
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=133fe0b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f5aae664b2df43c2
dashboard link: https://syzkaller.appspot.com/bug?extid=ebff3a27d86a72115648
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0a97b9de9f21/disk-090666d3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/40f470f8fbd0/vmlinux-090666d3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/baabfa2bfd44/bzImage-090666d3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ebff3a...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2798 jiffies s: 39421 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 15146 Comm: syz.4.3367 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_preemption_disabled+0x13/0x110 lib/smp_processor_id.c:13
Code: 00 cc cc 00 00 cc cc 48 c7 c7 80 42 df 8a 48 c7 c6 c0 42 df 8a eb 00 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 <48> 89 44 24 08 65 8b 05 a1 ba d1 75 65 8b 0d 42 10 d2 75 f7 c1 ff
RSP: 0018:ffffc900000078f8 EFLAGS: 00000082
RAX: 1a843908a591e700 RBX: 0000000000000000 RCX: ffffffff8136c17b
RDX: 0000000000000000 RSI: ffffffff8adf42c0 RDI: ffffffff8adf4280
RBP: 0000000000000000 R08: ffffffff8e2121af R09: 1ffffffff1c42435
R10: dffffc0000000000 R11: fffffbfff1c42436 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f0571edb6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f50a9a27dac CR3: 000000007859e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000008d24
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
rcu_is_watching+0x11/0xa0 kernel/rcu/tree.c:721
trace_local_timer_exit arch/x86/include/asm/trace/irq_vectors.h:41 [inline]
__sysvec_apic_timer_interrupt+0x1aa/0x5a0 arch/x86/kernel/apic/apic.c:1125
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 4f 57 1e f7 65 8b 05 50 08 c8 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90000007a40 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a02 RCX: 1a843908a591e700
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: 0000000000000001
RBP: ffffc90000007ad8 R08: ffffffff90b10327 R09: 1ffffffff2162064
R10: dffffc0000000000 R11: fffffbfff2162065 R12: dffffc0000000000
R13: ffff8880b8e28440 R14: ffff8880b8e28440 R15: 1ffff92000000f48
__mod_timer+0x925/0xd20 kernel/time/timer.c:1134
call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x56c/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__bpf_prog_run include/linux/filter.h:607 [inline]
RIP: 0010:bpf_prog_run include/linux/filter.h:614 [inline]
RIP: 0010:bpf_prog_run_array include/linux/bpf.h:1668 [inline]
RIP: 0010:trace_call_bpf+0x308/0x6b0 kernel/trace/bpf_trace.c:135
Code: be 4e 02 00 00 e8 b8 9c ce ff 66 90 e8 f1 56 f6 ff 4c 8d 63 30 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 e7 e8 be 7c 47 00 48 83 c3 48 48 8b 7c 24 20 48 89 de
RSP: 0018:ffffc900059aeec0 EFLAGS: 00000246
RAX: 1ffff92000b8a606 RBX: ffffc90005c53000 RCX: dffffc0000000000
RDX: ffffc9000e4d9000 RSI: 0000000000005aa1 RDI: 0000000000005aa2
RBP: ffffc900059aefb8 R08: dffffc0000000000 R09: 1ffffffff2162048
R10: dffffc0000000000 R11: fffffbfff2162049 R12: ffffc90005c53030
R13: ffff888030657b18 R14: ffff888030657b28 R15: 0000000000000001
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
perf_trace_lock_acquire+0x342/0x3f0 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x452/0x4a0 kernel/locking/lockdep.c:5647
debug_objects_fill_pool+0xa7/0x780 lib/debugobjects.c:653
debug_object_activate+0x32/0x4f0 lib/debugobjects.c:743
debug_rcu_head_queue kernel/rcu/rcu.h:190 [inline]
call_rcu+0xa2/0x950 kernel/rcu/tree.c:2834
alias_free_mem_rcu net/ipv4/fib_trie.c:302 [inline]
fib_table_delete+0xdc4/0xfc0 net/ipv4/fib_trie.c:1758
fib_magic+0x2ea/0x3b0 net/ipv4/fib_frontend.c:1120
fib_del_ifaddr+0x10b2/0x14c0 net/ipv4/fib_frontend.c:1331
fib_inetaddr_event+0xb7/0x1c0 net/ipv4/fib_frontend.c:1462
notifier_call_chain kernel/notifier.c:87 [inline]
blocking_notifier_call_chain+0x103/0x1b0 kernel/notifier.c:382
__inet_del_ifa+0xaac/0x1090 net/ipv4/devinet.c:445
inet_del_ifa net/ipv4/devinet.c:482 [inline]
devinet_ioctl+0x12e8/0x1bf0 net/ipv4/devinet.c:1235
inet_ioctl+0x2fa/0x460 net/ipv4/af_inet.c:1008
sock_do_ioctl+0xfb/0x320 net/socket.c:1202
sock_ioctl+0x48a/0x700 net/socket.c:1321
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0570f9de59
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:00007f0571edb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0571225fa0 RCX: 00007f0570f9de59
RDX: 0000200000000000 RSI: 000000000000891c RDI: 000000000000000a
RBP: 00007f0571033e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0571226038 R14: 00007f0571225fa0 R15: 00007fffe3a44bd8
</TASK>


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