[syzbot] [net?] WARNING in cake_dequeue (2)

From: syzbot
Date: Wed Jul 24 2024 - 05:45:56 EST

Hello,

syzbot found the following issue on:

HEAD commit: 7846b618e0a4 Merge tag 'rtc-6.11' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12b09fe9980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f4925140c45a2a50
dashboard link: https://syzkaller.appspot.com/bug?extid=3880fb06c3b7f5ec1878
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/1367075cbd79/disk-7846b618.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f252a22f2003/vmlinux-7846b618.xz
kernel image: https://storage.googleapis.com/syzbot-assets/23bea0ad3ab6/bzImage-7846b618.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3880fb06c3b7f5ec1878@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
WARNING: CPU: 0 PID: 22566 at net/sched/sch_cake.c:2094 cake_dequeue+0x2af1/0x4690 net/sched/sch_cake.c:2094
Modules linked in:
CPU: 0 PID: 22566 Comm: syz.3.4579 Not tainted 6.10.0-syzkaller-11323-g7846b618e0a4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:cake_dequeue+0x2af1/0x4690 net/sched/sch_cake.c:2094
Code: 74 08 4c 89 f7 e8 af d7 6b f8 4d 89 26 eb 05 e8 75 e1 08 f8 45 31 f6 4c 8b a4 24 08 01 00 00 e9 d4 de ff ff e8 60 e1 08 f8 90 <0f> 0b 90 48 8b 94 24 f0 00 00 00 48 89 d0 48 c1 e8 03 42 0f b6 04
RSP: 0018:ffffc900000079c0 EFLAGS: 00010246
RAX: ffffffff898a6160 RBX: 000000000000ffff RCX: ffff888067efda00
RDX: 0000000080000101 RSI: 000000000000ffff RDI: 0000000000000400
RBP: ffffc90000007c28 R08: ffffffff898a5f7c R09: ffffffff898a69e5
R10: 0000000000000003 R11: ffff888067efda00 R12: ffff88805a900010
R13: dffffc0000000000 R14: 000000000000ffff R15: ffff88805a900000
FS: 00007f3db68136c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3141fffc CR3: 0000000073d06000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
dequeue_skb net/sched/sch_generic.c:293 [inline]
qdisc_restart net/sched/sch_generic.c:398 [inline]
__qdisc_run+0x272/0x2170 net/sched/sch_generic.c:416
qdisc_run+0xda/0x270 include/net/pkt_sched.h:127
net_tx_action+0x89c/0xa50 net/core/dev.c:5322
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:stack_trace_save+0x0/0x1d0 kernel/stacktrace.c:114
Code: 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 0f 0b 90 45 31 e4 eb e1 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc9000a016db8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888067efdf80 RCX: 0000000000000000
RDX: 0000000000000002 RSI: 0000000000000010 RDI: ffffc9000a016e00
RBP: ffffc9000a016ef0 R08: ffffffff82005562 R09: 0000000000000000
R10: ffffc9000a016e00 R11: fffff52001402dd0 R12: dffffc0000000000
R13: 1ffff92001402dbc R14: ffffc9000a016e00 R15: 1ffff1100cfdfbf0
save_stack+0xfb/0x1f0 mm/page_owner.c:156
__set_page_owner+0x92/0x800 mm/page_owner.c:320
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473
prep_new_page mm/page_alloc.c:1481 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
vma_alloc_folio_noprof+0xf3/0x1f0 mm/mempolicy.c:2304
folio_prealloc+0x31/0x170
alloc_anon_folio mm/memory.c:4397 [inline]
do_anonymous_page mm/memory.c:4455 [inline]
do_pte_missing mm/memory.c:3895 [inline]
handle_pte_fault+0x257b/0x7090 mm/memory.c:5381
__handle_mm_fault mm/memory.c:5524 [inline]
handle_mm_fault+0xfb0/0x19d0 mm/memory.c:5689
faultin_page mm/gup.c:1305 [inline]
__get_user_pages+0x6ec/0x16a0 mm/gup.c:1604
populate_vma_page_range+0x264/0x330 mm/gup.c:2043
__mm_populate+0x27a/0x460 mm/gup.c:2146
mm_populate include/linux/mm.h:3469 [inline]
vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3db5975b59
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:00007f3db6813048 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f3db5b05f60 RCX: 00007f3db5975b59
RDX: 000000000000000f RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f3db59e4e5d R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000004008032 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000004d R14: 00007f3db5b05f60 R15: 00007ffc8713fc48
</TASK>
----------------
Code disassembly (best guess):
0: 5d pop %rbp
1: 41 5e pop %r14
3: 41 5f pop %r15
5: 5d pop %rbp
6: c3 ret
7: cc int3
8: cc int3
9: cc int3
a: cc int3
b: 90 nop
c: 0f 0b ud2
e: 90 nop
f: 45 31 e4 xor %r12d,%r12d
12: eb e1 jmp 0xfffffff5
14: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: 90 nop
25: 90 nop
26: 90 nop
27: 90 nop
28: 90 nop
29: 90 nop
* 2a: f3 0f 1e fa endbr64 <-- trapping instruction
2e: 55 push %rbp
2f: 48 89 e5 mov %rsp,%rbp
32: 41 57 push %r15
34: 41 56 push %r14
36: 41 55 push %r13
38: 41 54 push %r12
3a: 53 push %rbx
3b: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp
3f: 48 rex.W


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