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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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