=============================
[ BUG: Invalid wait context ]
6.15.0-syzkaller-08486-gf66bc387efbe #0 Not tainted
-----------------------------
syz.4.277/6889 is trying to lock:
ffffc90004ca5410 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x254/0xeb0 arch/x86/kvm/xen.c:1819
other info that might help us debug this:
context-{2:2}
5 locks held by syz.4.277/6889:
#0: ffff888031f45cf8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2a2/0x370 fs/file.c:1213
#1: ffff888052b32428 (sb_writers#6){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:738
#2: ffff888050863d90 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#2: ffff888050863d90 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3450
#3: ffff88806a533280 (lock#4){+.+.}-{3:3}, at: local_lock_acquire include/linux/local_lock_internal.h:38 [inline]
#3: ffff88806a533280 (lock#4){+.+.}-{3:3}, at: __folio_batch_add_and_move+0x698/0xc90 mm/swap.c:192
#4: ffffc90004ca5960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#4: ffffc90004ca5960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#4: ffffc90004ca5960 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x23a/0xeb0 arch/x86/kvm/xen.c:1817
stack backtrace:
CPU: 1 UID: 0 PID: 6889 Comm: syz.4.277 Not tainted 6.15.0-syzkaller-08486-gf66bc387efbe #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4833 [inline]
check_wait_context kernel/locking/lockdep.c:4905 [inline]
__lock_acquire+0xa12/0x1c90 kernel/locking/lockdep.c:5190
lock_acquire kernel/locking/lockdep.c:5871 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236
kvm_xen_set_evtchn_fast+0x254/0xeb0 arch/x86/kvm/xen.c:1819
xen_timer_callback+0x1db/0x2a0 arch/x86/kvm/xen.c:140
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x5ed/0xad0 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 e6 d2 19 f6 48 89 df e8 ce 26 1a f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 65 4e 0a f6 65 8b 05 2e 72 2c 08 85 c0 74 16 5b
RSP: 0018:ffffc9000c82f7d8 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff88804f46b098 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8dc06ed3 RDI: ffffffff8bf52fc0
RBP: 0000000000000282 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90877557 R11: 0000000000000001 R12: 000000000000001f
R13: dffffc0000000000 R14: ffff88806a5332b0 R15: ffff88806a5333b0
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
unlock_page_lruvec_irqrestore include/linux/memcontrol.h:1526 [inline]
folio_batch_move_lru+0x2b4/0x3b0 mm/swap.c:174
__folio_batch_add_and_move+0x369/0xc90 mm/swap.c:196
shmem_alloc_and_add_folio+0x83b/0xc20 mm/shmem.c:1948
shmem_get_folio_gfp+0x67f/0x1600 mm/shmem.c:2529
shmem_get_folio mm/shmem.c:2635 [inline]
shmem_write_begin+0x160/0x300 mm/shmem.c:3285
generic_perform_write+0x3cd/0x930 mm/filemap.c:4103
shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3460
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x6c4/0x1150 fs/read_write.c:686
ksys_write+0x12a/0x250 fs/read_write.c:738
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: 0033:0x7fb89c58e969
Code: 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 01 48
RSP: 002b:00007fb89d3ad038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb89c7b5fa0 RCX: 00007fb89c58e969
RDX: 000000000208e24b RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007fb89c610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb89c7b5fa0 R15: 00007fff5f598678
hpet: Lost 10 RTC interrupts
----------------
Code disassembly (best guess):
0: f5 cmc
1: 53 push %rbx
2: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
7: 48 89 fb mov %rdi,%rbx
a: 48 83 c7 18 add $0x18,%rdi
e: e8 e6 d2 19 f6 call 0xf619d2f9
13: 48 89 df mov %rbx,%rdi
16: e8 ce 26 1a f6 call 0xf61a26e9
1b: f7 c5 00 02 00 00 test $0x200,%ebp
21: 75 23 jne 0x46
23: 9c pushf
24: 58 pop %rax
25: f6 c4 02 test $0x2,%ah
28: 75 37 jne 0x61
* 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction
2f: e8 65 4e 0a f6 call 0xf60a4e99
34: 65 8b 05 2e 72 2c 08 mov %gs:0x82c722e(%rip),%eax # 0x82c7269
3b: 85 c0 test %eax,%eax
3d: 74 16 je 0x55
3f: 5b pop %rbx