=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
sed/11201 is trying to lock:
ffff8880207bd430 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1fb/0x9b0 arch/x86/kvm/xen.c:1820
other info that might help us debug this:
context-{2:2}
2 locks held by sed/11201:
#0: ffff88804868e2a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:330 [inline]
#0: ffff88804868e2a0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0 mm/util.c:578
#1: ffff8880207bd980 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#1: ffff8880207bd980 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#1: ffff8880207bd980 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1c3/0x9b0 arch/x86/kvm/xen.c:1818
stack backtrace:
CPU: 0 UID: 0 PID: 11201 Comm: sed Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4830 [inline]
check_wait_context kernel/locking/lockdep.c:4902 [inline]
__lock_acquire+0xbcb/0xd20 kernel/locking/lockdep.c:5187
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
kvm_xen_set_evtchn_fast+0x1fb/0x9b0 arch/x86/kvm/xen.c:1820
xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:140
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:stack_trace_consume_entry+0xf3/0x280 kernel/stacktrace.c:93
Code: 8b 74 24 08 48 8b 1f 45 8d 79 01 0f b6 44 15 00 84 c0 0f 85 3a 01 00 00 45 89 38 4e 8d 3c cb 4c 89 f8 48 c1 e8 03 80 3c 10 00 <74> 1a 4c 89 ff 48 89 f3 49 89 d4 4c 89 c5 e8 9a 18 78 00 49 89 e8
RSP: 0018:ffffc9000bd96a18 EFLAGS: 00000246
RAX: 1ffff920017b2d8b RBX: ffffc9000bd96be0 RCX: f2f98df9551aef00
RDX: dffffc0000000000 RSI: ffffffff820e8c7f RDI: ffffc9000bd96b20
RBP: 1ffff920017b2d66 R08: ffffc9000bd96b30 R09: 000000000000000f
R10: ffffc9000bd96ab8 R11: ffffffff81ac9640 R12: 0000000000000000
R13: 1ffff920017b2d65 R14: ffffc9000bd96b28 R15: ffffc9000bd96c58
arch_stack_walk+0x110/0x150 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_stack+0xf5/0x1f0 mm/page_owner.c:156
__set_page_owner+0x8d/0x4a0 mm/page_owner.c:329
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3869
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5159
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:3022 [inline]
allocate_slab+0x96/0x3a0 mm/slub.c:3195
new_slab mm/slub.c:3249 [inline]
___slab_alloc+0xe94/0x1920 mm/slub.c:4625
__kmem_cache_alloc_bulk+0x1e2/0x590 mm/slub.c:7307
__pcs_replace_empty_main+0x238/0x4b0 mm/slub.c:-1
alloc_from_pcs mm/slub.c:5096 [inline]
slab_alloc_node mm/slub.c:5216 [inline]
kmem_cache_alloc_noprof+0x453/0x6e0 mm/slub.c:5238
vm_area_dup+0x2b/0x680 mm/vma_init.c:123
__split_vma+0x1a9/0xa00 mm/vma.c:515
vms_gather_munmap_vmas+0x4c6/0x12e0 mm/vma.c:1380
__mmap_prepare mm/vma.c:2359 [inline]
__mmap_region mm/vma.c:2652 [inline]
mmap_region+0x722/0x2110 mm/vma.c:2740
do_mmap+0xc45/0x10d0 mm/mmap.c:558
vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:580
ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6f8c511242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007fffaaf58e18 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f6f8c433000 RCX: 00007f6f8c511242
RDX: 0000000000000005 RSI: 0000000000086000 RDI: 00007f6f8c433000
RBP: 0000000000000812 R08: 0000000000000003 R09: 0000000000010000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007fffaaf58e68
R13: 00007f6f8c4e50c0 R14: 00007fffaaf59220 R15: 00000ffff55eb1c6
----------------
Code disassembly (best guess):
0: 8b 74 24 08 mov 0x8(%rsp),%esi
4: 48 8b 1f mov (%rdi),%rbx
7: 45 8d 79 01 lea 0x1(%r9),%r15d
b: 0f b6 44 15 00 movzbl 0x0(%rbp,%rdx,1),%eax
10: 84 c0 test %al,%al
12: 0f 85 3a 01 00 00 jne 0x152
18: 45 89 38 mov %r15d,(%r8)
1b: 4e 8d 3c cb lea (%rbx,%r9,8),%r15
1f: 4c 89 f8 mov %r15,%rax
22: 48 c1 e8 03 shr $0x3,%rax
26: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1)
* 2a: 74 1a je 0x46 <-- trapping instruction
2c: 4c 89 ff mov %r15,%rdi
2f: 48 89 f3 mov %rsi,%rbx
32: 49 89 d4 mov %rdx,%r12
35: 4c 89 c5 mov %r8,%rbp
38: e8 9a 18 78 00 call 0x7818d7
3d: 49 89 e8 mov %rbp,%r8