netdev - [syzbot] [bpf?] [net?] general protection fault in bq_flush_to

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Message-ID: <0000000000003054f4061df097f5@google.com>
Date: Tue, 23 Jul 2024 14:10:26 -0700
From: syzbot <syzbot+3c2b6d5d4bec3b904933@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org, 
	daniel@...earbox.net, davem@...emloft.net, eddyz87@...il.com, 
	haoluo@...gle.com, hawk@...nel.org, john.fastabend@...il.com, 
	jolsa@...nel.org, kpsingh@...nel.org, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, martin.lau@...ux.dev, netdev@...r.kernel.org, 
	sdf@...ichev.me, song@...nel.org, syzkaller-bugs@...glegroups.com, 
	yonghong.song@...ux.dev
Subject: [syzbot] [bpf?] [net?] general protection fault in bq_flush_to_queue

Hello,

syzbot found the following issue on:

HEAD commit:    28bbe4ea686a Merge tag 'i2c-for-6.11-rc1-second-batch' of ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16ab4e19980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9d240b438cabdc8e
dashboard link: https://syzkaller.appspot.com/bug?extid=3c2b6d5d4bec3b904933
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/a6bb49754efa/disk-28bbe4ea.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/68010035620f/vmlinux-28bbe4ea.xz
kernel image: https://storage.googleapis.com/syzbot-assets/739b01ffb241/bzImage-28bbe4ea.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3c2b6d5d4bec3b904933@...kaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 9319 Comm: syz.4.1011 Not tainted 6.10.0-syzkaller-12084-g28bbe4ea686a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:bq_flush_to_queue+0x44/0x610 kernel/bpf/cpumap.c:675
Code: df e8 40 d8 d6 ff 49 8d 5e 50 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f6 e8 3a 00 48 8b 2b 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 1d 05 00 00 44 8b 65 00 4d 8d 6e 58 4c
RSP: 0018:ffffc90000a18a80 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880789a4290 RCX: ffff88801ab78000
RDX: 0000000000000100 RSI: 0000000000000010 RDI: ffff8880789a4240
RBP: 0000000000000000 R08: ffffffff896117da R09: 1ffffffff1f5cf4d
R10: dffffc0000000000 R11: fffffbfff1f5cf4e R12: 0000000000000001
R13: ffffc9000d1af820 R14: ffff8880789a4240 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20312356b8 CR3: 0000000079b12000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __cpu_map_flush+0x5d/0xd0 kernel/bpf/cpumap.c:767
 xdp_do_check_flushed+0x136/0x240 net/core/filter.c:4304
 __napi_poll+0xe4/0x490 net/core/dev.c:6774
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6962
 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
 common_interrupt+0xaa/0xd0 arch/x86/kernel/irq.c:278
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:389 [inline]
RIP: 0010:__rcu_read_lock+0x30/0xb0 kernel/rcu/tree_plugin.h:412
Code: 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 4c 8b 3c 25 00 d7 03 00 49 81 c7 44 04 00 00 4c 89 fb 48 c1 eb 03 42 0f b6 04 33 <84> c0 75 35 41 8b 2f ff c5 42 0f b6 04 33 84 c0 75 3e 41 89 2f 42
RSP: 0018:ffffc9000d1af6b0 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: 1ffff1100356f088 RCX: ffffffff81701eba
RDX: dffffc0000000000 RSI: ffffffff8bcad5a0 RDI: ffff88801f942780
RBP: ffff88813fffa000 R08: ffffffff92fcd837 R09: 1ffffffff25f9b06
R10: dffffc0000000000 R11: fffffbfff25f9b07 R12: 1ffff11002bddf93
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff88801ab78444
 rcu_read_lock include/linux/rcupdate.h:836 [inline]
 percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
 percpu_ref_put+0x12/0x180 include/linux/percpu-refcount.h:351
 obj_cgroup_put include/linux/memcontrol.h:802 [inline]
 __memcg_slab_free_hook+0xa7/0x310 mm/memcontrol.c:3050
 memcg_slab_free_hook mm/slub.c:2186 [inline]
 slab_free mm/slub.c:4470 [inline]
 kmem_cache_free+0x1cf/0x350 mm/slub.c:4548
 vma_lock_free kernel/fork.c:457 [inline]
 __vm_area_free+0xe0/0x110 kernel/fork.c:513
 remove_vma mm/mmap.c:187 [inline]
 exit_mmap+0x645/0xc80 mm/mmap.c:3406
 __mmput+0x115/0x380 kernel/fork.c:1345
 exit_mm+0x220/0x310 kernel/exit.c:571
 do_exit+0x9b2/0x27f0 kernel/exit.c:869
 do_group_exit+0x207/0x2c0 kernel/exit.c:1031
 get_signal+0x1695/0x1730 kernel/signal.c:2917
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd3c9775f19
Code: Unable to access opcode bytes at 0x7fd3c9775eef.
RSP: 002b:00007fd3ca6110f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fd3c9905f68 RCX: 00007fd3c9775f19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd3c9905f68
RBP: 00007fd3c9905f60 R08: 00007fd3ca6116c0 R09: 00007fd3ca6116c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd3c9905f6c
R13: 000000000000000b R14: 00007ffc73d12a30 R15: 00007ffc73d12b18
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_flush_to_queue+0x44/0x610 kernel/bpf/cpumap.c:675
Code: df e8 40 d8 d6 ff 49 8d 5e 50 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 f6 e8 3a 00 48 8b 2b 48 89 e8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 1d 05 00 00 44 8b 65 00 4d 8d 6e 58 4c
RSP: 0018:ffffc90000a18a80 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880789a4290 RCX: ffff88801ab78000
RDX: 0000000000000100 RSI: 0000000000000010 RDI: ffff8880789a4240
RBP: 0000000000000000 R08: ffffffff896117da R09: 1ffffffff1f5cf4d
R10: dffffc0000000000 R11: fffffbfff1f5cf4e R12: 0000000000000001
R13: ffffc9000d1af820 R14: ffff8880789a4240 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20312356b8 CR3: 0000000079b12000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	40 d8 d6             	rex fcom %st(6)
   5:	ff 49 8d             	decl   -0x73(%rcx)
   8:	5e                   	pop    %rsi
   9:	50                   	push   %rax
   a:	48 89 d8             	mov    %rbx,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  16:	74 08                	je     0x20
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	e8 f6 e8 3a 00       	call   0x3ae916
  20:	48 8b 2b             	mov    (%rbx),%rbp
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 1d 05 00 00    	jne    0x554
  37:	44 8b 65 00          	mov    0x0(%rbp),%r12d
  3b:	4d 8d 6e 58          	lea    0x58(%r14),%r13
  3f:	4c                   	rex.WR


---
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