[v6.1] INFO: rcu detected stall in __do_softirq

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 88690811da69 Linux 6.1.92
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12ced8bc980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ee57a613e7f5bf6c
dashboard link: https://syzkaller.appspot.com/bug?extid=55d93318bf4f78f520fd
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8b45ba80e02a/disk-88690811.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ca769d644800/vmlinux-88690811.xz
kernel image: https://storage.googleapis.com/syzbot-assets/26a1d8aecbf6/bzImage-88690811.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+55d933...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2655 jiffies s: 4869 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3572 Comm: syz-executor.0 Not tainted 6.1.92-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:debug_object_activate+0x1d9/0x4e0 lib/debugobjects.c:705
Code: 23 02 00 00 48 81 fb 00 f0 ff ff 0f 87 3e 02 00 00 4c 8d 73 10 4c 89 f5 48 c1 ed 03 42 0f b6 44 3d 00 84 c0 0f 85 5b 02 00 00 <41> 8b 06 8d 48 ff 83 f9 02 0f 82 ed 00 00 00 83 c0 fd 83 f8 01 0f
RSP: 0018:ffffc900001e0a08 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880587b7b98 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc900001e08e0
RBP: 1ffff1100b0f6f75 R08: dffffc0000000000 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: ffffffff91f46fb0
R13: ffff8880200e6340 R14: ffff8880587b7ba8 R15: dffffc0000000000
FS: 00005555558f5480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1a0b376440 CR3: 000000005bf0e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<IRQ>
debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline]
debug_activate kernel/time/hrtimer.c:475 [inline]
enqueue_hrtimer+0x30/0x410 kernel/time/hrtimer.c:1084
__run_hrtimer kernel/time/hrtimer.c:1703 [inline]
__hrtimer_run_queues+0x728/0xe50 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x3e/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:__do_softirq+0x1f3/0xa4c kernel/softirq.c:559
Code: 00 00 00 44 0f b7 f3 48 c7 c7 60 fa ea 8a e8 a4 1f cb ff 65 66 c7 05 9a 9d 43 75 00 00 e8 b5 4d d1 f6 fb 49 c7 c7 c0 a0 e0 8c <44> 89 74 24 54 b8 ff ff ff ff 0f bc 44 24 54 41 89 c4 41 ff c4 0f
RSP: 0018:ffffc900001e0e00 EFLAGS: 00000286
RAX: 3d0b1b3c6ace6100 RBX: 0000000000400386 RCX: ffffffff816acf0a
RDX: dffffc0000000000 RSI: ffffffff8aec01c0 RDI: ffffffff8b3d45e0
RBP: ffffc900001e0f30 R08: dffffc0000000000 R09: fffffbfff2093846
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888017763b80
R13: 1ffff9200003c1e8 R14: 0000000000000386 R15: ffffffff8ce0a0c0
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: c1 bc f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 fe 3b d5 f6 48 89 df e8 66 79 d6 f6 e8 31 04 fc f6 fb bf 01 00 00 00 <e8> 56 08 c9 f6 65 8b 05 c7 23 6d 75 85 c0 74 02 5b c3 e8 f4 48 6b
RSP: 0018:ffffc90003b4f7d8 EFLAGS: 00000286
RAX: 3d0b1b3c6ace6100 RBX: ffff888053949cb0 RCX: ffffffff816acf0a
RDX: dffffc0000000000 RSI: ffffffff8aec01c0 RDI: 0000000000000001
RBP: 1ffff1100a729395 R08: dffffc0000000000 R09: fffffbfff2093846
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffea0001975f00
R13: 000000000000000b R14: ffffea0001975f00 R15: ffff888053949ca8
spin_unlock_irq include/linux/spinlock.h:401 [inline]
filemap_remove_folio+0x10d/0x2e0 mm/filemap.c:256
truncate_inode_folio+0x59/0x70 mm/truncate.c:195
shmem_undo_range+0x570/0x2390 mm/shmem.c:942
shmem_truncate_range mm/shmem.c:1062 [inline]
shmem_evict_inode+0x265/0xa60 mm/shmem.c:1171
evict+0x2a4/0x620 fs/inode.c:666
__dentry_kill+0x436/0x650 fs/dcache.c:607
dentry_kill+0xbb/0x290
dput+0xfb/0x1d0 fs/dcache.c:914
__fput+0x5e4/0x890 fs/file_table.c:328
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f67bcc7e297
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffef909abf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f67bcc7e297
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffef909acb0
RBP: 00007ffef909acb0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffef909bd60
R13: 00007f67bccd9636 R14: 0000000000019787 R15: 0000000000000004
</TASK>


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