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Message-ID: <66f812c1.050a0220.4a974.0009.GAE@google.com>
Date: Sat, 28 Sep 2024 07:29:21 -0700
From: syzbot <syzbot+0a31340d42a1d572f904@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, eperezma@...hat.com, 
	jasowang@...hat.com, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	mst@...hat.com, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com, virtualization@...ts.linux.dev, 
	xuanzhuo@...ux.alibaba.com
Subject: [syzbot] [net?] [virt?] BUG: unable to handle kernel paging request
 in clear_page_erms (6)

Hello,

syzbot found the following issue on:

HEAD commit:    abf2050f51fd Merge tag 'media/v6.12-1' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15a03107980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2a8c36c5e2b56016
dashboard link: https://syzkaller.appspot.com/bug?extid=0a31340d42a1d572f904
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/9800778169d6/disk-abf2050f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/32a789de3883/vmlinux-abf2050f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/24e5e7200094/bzImage-abf2050f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0a31340d42a1d572f904@...kaller.appspotmail.com

BUG: unable to handle page fault for address: ffff8880603bc000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1a801067 P4D 1a801067 PUD 6c591063 PMD 30259063 PTE 800fffff9fc43060
Oops: Oops: 0002 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 14210 Comm: syz.2.2649 Not tainted 6.11.0-syzkaller-09959-gabf2050f51fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:clear_page_erms+0xb/0x20 arch/x86/lib/clear_page_64.S:50
Code: 48 8d 7f 40 75 d9 90 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa b9 00 10 00 00 31 c0 <f3> aa c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90
RSP: 0018:ffffc90000007310 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000001000
RDX: ffff8880603bc000 RSI: 0000000000000001 RDI: ffff8880603bc000
RBP: dffffc0000000000 R08: ffffea000180ef37 R09: 0000000000000000
R10: ffffed100c077800 R11: fffff94000301de7 R12: 0000000000000001
R13: 0000000000000001 R14: ffffea000180ef00 R15: 0000000000000000
FS:  00007fa3b27206c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8880603bc000 CR3: 000000003ec82000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 clear_page arch/x86/include/asm/page_64.h:54 [inline]
 clear_highpage_kasan_tagged include/linux/highmem.h:248 [inline]
 kernel_init_pages mm/page_alloc.c:1036 [inline]
 post_alloc_hook+0xf8/0x230 mm/page_alloc.c:1535
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x3039/0x3180 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4733
 page_frag_alloc_1k net/core/skbuff.c:249 [inline]
 napi_alloc_skb+0x641/0xa00 net/core/skbuff.c:847
 page_to_skb+0x276/0x9b0 drivers/net/virtio_net.c:800
 receive_mergeable drivers/net/virtio_net.c:2253 [inline]
 receive_buf+0x3bc/0x17b0 drivers/net/virtio_net.c:2391
 virtnet_receive_packets drivers/net/virtio_net.c:2698 [inline]
 virtnet_receive drivers/net/virtio_net.c:2722 [inline]
 virtnet_poll+0x26b2/0x3980 drivers/net/virtio_net.c:2817
 __napi_poll+0xcb/0x490 net/core/dev.c:6771
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6962
 handle_softirqs+0x2c5/0x980 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+0xb9/0xd0 arch/x86/kernel/irq.c:278
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5189
Code: c9 50 e8 79 fa 0b 00 48 83 c4 08 4c 89 f7 e8 4d 39 00 00 e9 de 04 00 00 4c 89 f7 e8 e0 70 60 0a e8 db 58 38 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc9000caa7228 EFLAGS: 00000282
RAX: 0b99d481b6833300 RBX: ffff888050f50000 RCX: ffffffff817088da
RDX: dffffc0000000000 RSI: ffffffff8c0aca40 RDI: ffffffff8c601bc0
RBP: ffffc9000caa7270 R08: ffffffff9422a907 R09: 1ffffffff2845520
R10: dffffc0000000000 R11: fffffbfff2845521 R12: 1ffff110170c7f0c
R13: dffffc0000000000 R14: ffff8880b863ea40 R15: ffff8880b863f860
 context_switch kernel/sched/core.c:5318 [inline]
 __schedule+0x184b/0x4ae0 kernel/sched/core.c:6674
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6853
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6877
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 free_unref_page+0x6b5/0xf00 mm/page_alloc.c:2662
 __folio_put+0x2c7/0x440 mm/swap.c:126
 secretmem_fault+0x1f9/0x430 mm/secretmem.c:87
 __do_fault+0x135/0x460 mm/memory.c:4876
 do_shared_fault mm/memory.c:5346 [inline]
 do_fault mm/memory.c:5420 [inline]
 do_pte_missing mm/memory.c:3965 [inline]
 handle_pte_fault+0x1105/0x6800 mm/memory.c:5751
 __handle_mm_fault mm/memory.c:5894 [inline]
 handle_mm_fault+0x1053/0x1ad0 mm/memory.c:6062
 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc9000caa7df0 EFLAGS: 00050246
RAX: 0000000600000005 RBX: 0000000020000088 RCX: 0000000000000008
RDX: 0000000000000000 RSI: ffffc9000caa7e80 RDI: 0000000020000080
RBP: ffffc9000caa7ef0 R08: ffffc9000caa7e87 R09: 1ffff92001954fd0
R10: dffffc0000000000 R11: fffff52001954fd1 R12: 0000000000000008
R13: ffffc9000caa7e80 R14: 0000000020000080 R15: ffffc9000caa7e80
 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline]
 _inline_copy_to_user include/linux/uaccess.h:188 [inline]
 _copy_to_user+0x86/0xb0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:216 [inline]
 do_pipe2+0x109/0x310 fs/pipe.c:1026
 __do_sys_pipe fs/pipe.c:1047 [inline]
 __se_sys_pipe fs/pipe.c:1045 [inline]
 __x64_sys_pipe+0x3a/0x50 fs/pipe.c:1045
 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: 0033:0x7fa3b197def9
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:00007fa3b2720038 EFLAGS: 00000246 ORIG_RAX: 0000000000000016
RAX: ffffffffffffffda RBX: 00007fa3b1b36058 RCX: 00007fa3b197def9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 00007fa3b19f0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa3b1b36058 R15: 00007ffd07c8ed88
 </TASK>
Modules linked in:
CR2: ffff8880603bc000
---[ end trace 0000000000000000 ]---
RIP: 0010:clear_page_erms+0xb/0x20 arch/x86/lib/clear_page_64.S:50
Code: 48 8d 7f 40 75 d9 90 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa b9 00 10 00 00 31 c0 <f3> aa c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90
RSP: 0018:ffffc90000007310 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000001000
RDX: ffff8880603bc000 RSI: 0000000000000001 RDI: ffff8880603bc000
RBP: dffffc0000000000 R08: ffffea000180ef37 R09: 0000000000000000
R10: ffffed100c077800 R11: fffff94000301de7 R12: 0000000000000001
R13: 0000000000000001 R14: ffffea000180ef00 R15: 0000000000000000
FS:  00007fa3b27206c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8880603bc000 CR3: 000000003ec82000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 8d 7f 40          	lea    0x40(%rdi),%rdi
   4:	75 d9                	jne    0xffffffdf
   6:	90                   	nop
   7:	c3                   	ret
   8:	cc                   	int3
   9:	cc                   	int3
   a:	cc                   	int3
   b:	cc                   	int3
   c:	0f 1f 00             	nopl   (%rax)
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	b9 00 10 00 00       	mov    $0x1000,%ecx
  28:	31 c0                	xor    %eax,%eax
* 2a:	f3 aa                	rep stos %al,%es:(%rdi) <-- trapping instruction
  2c:	c3                   	ret
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  38:	00 00 00
  3b:	0f 1f 40 00          	nopl   0x0(%rax)
  3f:	90                   	nop


---
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@...glegroups.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 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

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