[syzbot] [net?] [virt?] BUG: sleeping function called from invalid context in __set_page_owner

[syzbot] [net?] [virt?] BUG: sleeping function called from invalid context in __set_page_owner

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    ec714e371f22 Merge tag 'perf-tools-for-v6.18-1-2025-10-08'..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=174a4b34580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=db9c80a8900dca57
dashboard link: https://syzkaller.appspot.com/bug?extid=665739f456b28f32b23d
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=140e0dcd980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1581452f980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6d5cce2bcf5d/disk-ec714e37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/60dff1e3a58f/vmlinux-ec714e37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6a1823720b55/bzImage-ec714e37.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+665739f456b28f32b23d@syzkaller.appspotmail.com

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6069, name: syz.0.17
preempt_count: 1, expected: 0
RCU nest depth: 2, expected: 2
5 locks held by syz.0.17/6069:
 #0: ffff888035808350 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1679 [inline]
 #0: ffff888035808350 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: vsock_connect+0x152/0xe20 net/vmw_vsock/af_vsock.c:1546
 #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2074 [inline]
 #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run9+0x1ec/0x500 kernel/trace/bpf_trace.c:2123
 #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: bpf_stream_page_local_lock kernel/bpf/stream.c:46 [inline]
 #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: bpf_stream_elem_alloc kernel/bpf/stream.c:175 [inline]
 #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: __bpf_stream_push_str+0x211/0xbe0 kernel/bpf/stream.c:190
 #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
 #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: __rt_spin_trylock kernel/locking/spinlock_rt.c:110 [inline]
 #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x10d/0x2b0 kernel/locking/spinlock_rt.c:118
 #4: ffff8880b883f6e8 (&s->lock_key#5){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
 #4: ffff8880b883f6e8 (&s->lock_key#5){+.+.}-{3:3}, at: ___slab_alloc+0x12f/0x1470 mm/slub.c:4492
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 UID: 0 PID: 6069 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 __might_resched+0x44b/0x5d0 kernel/sched/core.c:8925
 __rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
 rt_spin_lock+0xc7/0x3e0 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:44 [inline]
 ___slab_alloc+0x12f/0x1470 mm/slub.c:4492
 __slab_alloc+0xc6/0x1f0 mm/slub.c:4746
 __slab_alloc_node mm/slub.c:4822 [inline]
 slab_alloc_node mm/slub.c:5233 [inline]
 __kmalloc_cache_noprof+0xec/0x6c0 mm/slub.c:5719
 kmalloc_noprof include/linux/slab.h:957 [inline]
 add_stack_record_to_list mm/page_owner.c:172 [inline]
 inc_stack_record_count mm/page_owner.c:214 [inline]
 __set_page_owner+0x25c/0x490 mm/page_owner.c:333
 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+0x28c0/0x2960 mm/page_alloc.c:3884
 alloc_frozen_pages_nolock_noprof+0xbc/0x150 mm/page_alloc.c:7595
 alloc_pages_nolock_noprof+0xa/0x30 mm/page_alloc.c:7628
 bpf_stream_page_replace+0x19/0x1e0 kernel/bpf/stream.c:86
 bpf_stream_page_reserve_elem kernel/bpf/stream.c:142 [inline]
 bpf_stream_elem_alloc kernel/bpf/stream.c:177 [inline]
 __bpf_stream_push_str+0x35c/0xbe0 kernel/bpf/stream.c:190
 bpf_stream_stage_printk+0x14e/0x1c0 kernel/bpf/stream.c:448
 bpf_prog_report_may_goto_violation+0xc4/0x190 kernel/bpf/core.c:3181
 bpf_check_timed_may_goto+0xaa/0xb0 kernel/bpf/core.c:3199
 arch_bpf_timed_may_goto+0x21/0x40 arch/x86/net/bpf_timed_may_goto.S:40
 bpf_prog_6fd842a53d323cc5+0x53/0x5f
 bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run include/linux/filter.h:728 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
 bpf_trace_run9+0x2db/0x500 kernel/trace/bpf_trace.c:2123
 __bpf_trace_virtio_transport_alloc_pkt+0x2d7/0x340 include/trace/events/vsock_virtio_transport_common.h:39
 __do_trace_virtio_transport_alloc_pkt include/trace/events/vsock_virtio_transport_common.h:39 [inline]
 trace_virtio_transport_alloc_pkt include/trace/events/vsock_virtio_transport_common.h:39 [inline]
 virtio_transport_alloc_skb+0x10cc/0x1130 net/vmw_vsock/virtio_transport_common.c:311
 virtio_transport_send_pkt_info+0x6be/0x1100 net/vmw_vsock/virtio_transport_common.c:390
 virtio_transport_connect+0xa7/0x100 net/vmw_vsock/virtio_transport_common.c:1072
 vsock_connect+0xb8b/0xe20 net/vmw_vsock/af_vsock.c:1611
 __sys_connect_file net/socket.c:2102 [inline]
 __sys_connect+0x323/0x450 net/socket.c:2121
 __do_sys_connect net/socket.c:2127 [inline]
 __se_sys_connect net/socket.c:2124 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2124
 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: 0033:0x7f770871eec9
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:00007ffd178f3108 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f7708975fa0 RCX: 00007f770871eec9
RDX: 0000000000000010 RSI: 0000200000000100 RDI: 0000000000000005
RBP: 00007f77087a1f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7708975fa0 R14: 00007f7708975fa0 R15: 0000000000000003
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [net?] [virt?] BUG: sleeping function called from invalid context in __set_page_owner

[Hillf Danton]

> Date: Thu, 09 Oct 2025 09:46:27 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ec714e371f22 Merge tag 'perf-tools-for-v6.18-1-2025-10-08'..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=174a4b34580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=db9c80a8900dca57
> dashboard link: https://syzkaller.appspot.com/bug?extid=665739f456b28f32b23d
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=140e0dcd980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1581452f980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/6d5cce2bcf5d/disk-ec714e37.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/60dff1e3a58f/vmlinux-ec714e37.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/6a1823720b55/bzImage-ec714e37.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+665739f456b28f32b23d@syzkaller.appspotmail.com
> 
> BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6069, name: syz.0.17
> preempt_count: 1, expected: 0
> RCU nest depth: 2, expected: 2
> 5 locks held by syz.0.17/6069:
>  #0: ffff888035808350 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1679 [inline]
>  #0: ffff888035808350 (sk_lock-AF_VSOCK){+.+.}-{0:0}, at: vsock_connect+0x152/0xe20 net/vmw_vsock/af_vsock.c:1546
>  #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
>  #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
>  #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2074 [inline]
>  #1: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run9+0x1ec/0x500 kernel/trace/bpf_trace.c:2123
>  #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: bpf_stream_page_local_lock kernel/bpf/stream.c:46 [inline]
>  #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: bpf_stream_elem_alloc kernel/bpf/stream.c:175 [inline]
>  #2: ffff8880b8832c88 ((stream_local_lock)){+.+.}-{3:3}, at: __bpf_stream_push_str+0x211/0xbe0 kernel/bpf/stream.c:190
>  #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
>  #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
>  #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: __rt_spin_trylock kernel/locking/spinlock_rt.c:110 [inline]
>  #3: ffffffff8d7aa500 (rcu_read_lock){....}-{1:3}, at: rt_spin_trylock+0x10d/0x2b0 kernel/locking/spinlock_rt.c:118
>  #4: ffff8880b883f6e8 (&s->lock_key#5){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
>  #4: ffff8880b883f6e8 (&s->lock_key#5){+.+.}-{3:3}, at: ___slab_alloc+0x12f/0x1470 mm/slub.c:4492
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 0 UID: 0 PID: 6069 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
>  __might_resched+0x44b/0x5d0 kernel/sched/core.c:8925
>  __rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
>  rt_spin_lock+0xc7/0x3e0 kernel/locking/spinlock_rt.c:57
>  spin_lock include/linux/spinlock_rt.h:44 [inline]

Given atomic context enforced by bpf [1], this is another case that bpf makes
trouble.

[1] cant_sleep() in __bpf_trace_run()
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/trace/bpf_trace.c#n2065

>  ___slab_alloc+0x12f/0x1470 mm/slub.c:4492
>  __slab_alloc+0xc6/0x1f0 mm/slub.c:4746
>  __slab_alloc_node mm/slub.c:4822 [inline]
>  slab_alloc_node mm/slub.c:5233 [inline]
>  __kmalloc_cache_noprof+0xec/0x6c0 mm/slub.c:5719
>  kmalloc_noprof include/linux/slab.h:957 [inline]
>  add_stack_record_to_list mm/page_owner.c:172 [inline]
>  inc_stack_record_count mm/page_owner.c:214 [inline]
>  __set_page_owner+0x25c/0x490 mm/page_owner.c:333
>  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+0x28c0/0x2960 mm/page_alloc.c:3884
>  alloc_frozen_pages_nolock_noprof+0xbc/0x150 mm/page_alloc.c:7595
>  alloc_pages_nolock_noprof+0xa/0x30 mm/page_alloc.c:7628
>  bpf_stream_page_replace+0x19/0x1e0 kernel/bpf/stream.c:86
>  bpf_stream_page_reserve_elem kernel/bpf/stream.c:142 [inline]
>  bpf_stream_elem_alloc kernel/bpf/stream.c:177 [inline]
>  __bpf_stream_push_str+0x35c/0xbe0 kernel/bpf/stream.c:190
>  bpf_stream_stage_printk+0x14e/0x1c0 kernel/bpf/stream.c:448
>  bpf_prog_report_may_goto_violation+0xc4/0x190 kernel/bpf/core.c:3181
>  bpf_check_timed_may_goto+0xaa/0xb0 kernel/bpf/core.c:3199
>  arch_bpf_timed_may_goto+0x21/0x40 arch/x86/net/bpf_timed_may_goto.S:40
>  bpf_prog_6fd842a53d323cc5+0x53/0x5f
>  bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline]
>  __bpf_prog_run include/linux/filter.h:721 [inline]
>  bpf_prog_run include/linux/filter.h:728 [inline]
>  __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
>  bpf_trace_run9+0x2db/0x500 kernel/trace/bpf_trace.c:2123
>  __bpf_trace_virtio_transport_alloc_pkt+0x2d7/0x340 include/trace/events/vsock_virtio_transport_common.h:39
>  __do_trace_virtio_transport_alloc_pkt include/trace/events/vsock_virtio_transport_common.h:39 [inline]
>  trace_virtio_transport_alloc_pkt include/trace/events/vsock_virtio_transport_common.h:39 [inline]
>  virtio_transport_alloc_skb+0x10cc/0x1130 net/vmw_vsock/virtio_transport_common.c:311
>  virtio_transport_send_pkt_info+0x6be/0x1100 net/vmw_vsock/virtio_transport_common.c:390
>  virtio_transport_connect+0xa7/0x100 net/vmw_vsock/virtio_transport_common.c:1072
>  vsock_connect+0xb8b/0xe20 net/vmw_vsock/af_vsock.c:1611
>  __sys_connect_file net/socket.c:2102 [inline]
>  __sys_connect+0x323/0x450 net/socket.c:2121
>  __do_sys_connect net/socket.c:2127 [inline]
>  __se_sys_connect net/socket.c:2124 [inline]
>  __x64_sys_connect+0x7a/0x90 net/socket.c:2124
>  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

Re: [syzbot] [net?] [virt?] BUG: sleeping function called from invalid context in __set_page_owner

[Hillf Danton]

> Date: Thu, 09 Oct 2025 09:46:27 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ec714e371f22 Merge tag 'perf-tools-for-v6.18-1-2025-10-08'..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=174a4b34580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=db9c80a8900dca57
> dashboard link: https://syzkaller.appspot.com/bug?extid=665739f456b28f32b23d
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=140e0dcd980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1581452f980000

Test Alexei's fix.

#syz test

--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -168,6 +168,9 @@ static void add_stack_record_to_list(struct stack_record *stack_record,
 	unsigned long flags;
 	struct stack *stack;
 
+	if (!gfpflags_allow_spinning(gfp_mask))
+		return;
+
 	set_current_in_page_owner();
 	stack = kmalloc(sizeof(*stack), gfp_nested_mask(gfp_mask));
 	if (!stack) {
--

Re: [syzbot] [net?] [virt?] BUG: sleeping function called from invalid context in __set_page_owner

[syzbot]

syzbot has bisected this issue to:

commit e8d01330225210a8af55f5683fb2ca726717ee16
Author: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date:   Thu Jul 3 20:48:13 2025 +0000

    bpf: Report may_goto timeout to BPF stderr

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11d19892580000
start commit:   ec714e371f22 Merge tag 'perf-tools-for-v6.18-1-2025-10-08'..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13d19892580000
console output: https://syzkaller.appspot.com/x/log.txt?x=15d19892580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=db9c80a8900dca57
dashboard link: https://syzkaller.appspot.com/bug?extid=665739f456b28f32b23d
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=138591e2580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17fcb458580000

Reported-by: syzbot+665739f456b28f32b23d@syzkaller.appspotmail.com
Fixes: e8d013302252 ("bpf: Report may_goto timeout to BPF stderr")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Re: [syzbot] [net?] [virt?] BUG: sleeping function called from invalid context in __set_page_owner

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+665739f456b28f32b23d@syzkaller.appspotmail.com
Tested-by: syzbot+665739f456b28f32b23d@syzkaller.appspotmail.com

Tested on:

commit:         5472d60c Merge tag 'trace-v6.18-2' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=178251e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=db9c80a8900dca57
dashboard link: https://syzkaller.appspot.com/bug?extid=665739f456b28f32b23d
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=120851e2580000

Note: testing is done by a robot and is best-effort only.