[v5.15] INFO: rcu detected stall in sys_rename (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: cc5ec8769306 Linux 5.15.196
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=100328b4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=927522d0dad3d7fe41cd
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ed7568bc5bb4/disk-cc5ec876.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e343e0aaac77/vmlinux-cc5ec876.xz
kernel image: https://storage.googleapis.com/syzbot-assets/089870f2a980/bzImage-cc5ec876.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+927522...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (1 GPs behind) idle=89f/1/0x4000000000000002 softirq=47030/47031 fqs=4994
(detected by 1, t=10502 jiffies, g=66173, q=520)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11903 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:55 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x3a/0x290 mm/kasan/generic.c:189
Code: 49 89 f8 49 01 f0 0f 82 57 02 00 00 49 89 f8 49 c1 e8 2f 41 81 f8 ff ff 01 00 0f 82 43 02 00 00 49 bf 01 00 00 00 00 fc ff df <49> 89 fb 49 c1 eb 03 49 b8 00 00 00 00 00 fc ff df 4f 8d 0c 03 48
RSP: 0018:ffffc90000007080 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000010 RCX: ffffffff813482dd
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90000007250
RBP: 0000000000000000 R08: 000000000001ffff R09: ffffc90000007250
R10: fffff52000000e4c R11: 1ffff92000000e4a R12: 1ffffffff1bd29a1
R13: dffffc0000000000 R14: ffffc90000007250 R15: dffffc0000000001
FS: 00007f305e6d5880(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000001 CR3: 000000007a8c0000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
memset+0x1e/0x40 mm/kasan/shadow.c:44
unwind_next_frame+0xa3d/0x1d90 arch/x86/kernel/unwind_orc.c:547
perf_callchain_kernel+0x4eb/0x650 arch/x86/events/core.c:2783
get_perf_callchain+0x376/0x480 kernel/events/callchain.c:200
perf_callchain kernel/events/core.c:7606 [inline]
perf_prepare_sample+0x352/0x1cb0 kernel/events/core.c:7633
__perf_event_output kernel/events/core.c:7802 [inline]
perf_event_output_forward+0x146/0x280 kernel/events/core.c:7822
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007b00 EFLAGS: 00000206
RAX: f01fe66579826d00 RBX: 1ffff92000000f64 RCX: f01fe66579826d00
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580
RBP: ffffc90000007be0 R08: dffffc0000000000 R09: fffffbfff1ff7c2f
R10: fffffbfff1ff7c2f R11: 1ffffffff1ff7c2e R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
ieee80211_rx_napi+0x1f4/0x360 net/mac80211/rx.c:5010
ieee80211_rx include/net/mac80211.h:4573 [inline]
ieee80211_handle_queued_frames+0x105/0x1b0 net/mac80211/main.c:237
tasklet_action_common+0x298/0x400 kernel/softirq.c:806
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:call_rcu+0x6bf/0x930 kernel/rcu/tree.c:3092
Code: 84 24 a1 00 00 00 02 75 5e f7 44 24 58 00 02 00 00 49 bc 00 00 00 00 00 fc ff df 74 01 fb 48 c7 84 24 80 00 00 00 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 66 43 c7 44 25 09 00 00 43 c6 44 25 0b
RSP: 0018:ffffc900031df9e0 EFLAGS: 00000206
RAX: f01fe66579826d00 RBX: ffff88805abbee40 RCX: f01fe66579826d00
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580
RBP: ffffc900031dfb10 R08: dffffc0000000000 R09: fffffbfff1ff7c2f
R10: fffffbfff1ff7c2f R11: 1ffffffff1ff7c2e R12: dffffc0000000000
R13: 1ffff9200063bf4c R14: 1ffff11017207654 R15: 0000000000000001
__destroy_inode+0x27b/0x5f0 fs/inode.c:286
destroy_inode fs/inode.c:309 [inline]
evict+0x72e/0x870 fs/inode.c:662
__dentry_kill+0x431/0x650 fs/dcache.c:586
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xd8/0x1a0 fs/dcache.c:893
do_renameat2+0x704/0xf70 fs/namei.c:4995
__do_sys_rename fs/namei.c:5039 [inline]
__se_sys_rename fs/namei.c:5037 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5037
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f305e796cc7
Code: e8 5e a7 09 00 f7 d8 19 c0 5b c3 0f 1f 84 00 00 00 00 00 b8 ff ff ff ff 5b c3 66 0f 1f 84 00 00 00 00 00 b8 52 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 01 61 17 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffd5efab648 EFLAGS: 00000202 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 000055d7fc60e5a0 RCX: 00007f305e796cc7
RDX: 000055d7fc5cb010 RSI: 00007ffd5efab660 RDI: 00007ffd5efaba60
RBP: 000055d7fc5e3e00 R08: 00000000000001e0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd5efab660
R13: 00007ffd5efaba60 R14: 0000000000000000 R15: 000055d7f22749dd
</TASK>


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