On Sun, Feb 18, 2024 at 09:06:18PM -0800, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: d37e1e4c52bc Add linux-next specific files for 20240216 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=171ca652180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4bc446d42a7d56c0 > dashboard link: https://syzkaller.appspot.com/bug?extid=6f3c38e8a6a0297caa5a > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/14d0894504b9/disk-d37e1e4c.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6cda61e084ee/vmlinux-d37e1e4c.xz > kernel image: https://storage.googleapis.com/syzbot-assets/720c85283c05/bzImage-d37e1e4c.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+6f3c38e8a6a0297caa5a@xxxxxxxxxxxxxxxxxxxxxxxxx > > Key type pkcs7_test registered > Block layer SCSI generic (bsg) driver version 0.4 loaded (major 239) > io scheduler mq-deadline registered > io scheduler kyber registered > io scheduler bfq registered > input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0 > ACPI: button: Power Button [PWRF] > input: Sleep Button as /devices/LNXSYSTM:00/LNXSLPBN:00/input/input1 > ACPI: button: Sleep Button [SLPF] > ioatdma: Intel(R) QuickData Technology Driver 5.00 > ACPI: \_SB_.LNKC: Enabled at IRQ 11 > virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver > ACPI: \_SB_.LNKD: Enabled at IRQ 10 > virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver > ACPI: \_SB_.LNKB: Enabled at IRQ 10 > virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver > virtio-pci 0000:00:07.0: virtio_pci: leaving for legacy driver > N_HDLC line discipline registered with maxframe=4096 > Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled > 00:03: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A > 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A > 00:05: ttyS2 at I/O 0x3e8 (irq = 6, base_baud = 115200) is a 16550A > 00:06: ttyS3 at I/O 0x2e8 (irq = 7, base_baud = 115200) is a 16550A > Non-volatile memory driver v1.3 > Linux agpgart interface v0.103 > ACPI: bus type drm_connector registered > [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0 > [drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1 > Console: switching to colour frame buffer device 128x48 > platform vkms: [drm] fb0: vkmsdrmfb frame buffer device > usbcore: registered new interface driver udl > brd: module loaded > loop: module loaded > zram: Added device: zram0 > null_blk: disk nullb0 created > null_blk: module loaded > Guest personality initialized and is inactive > VMCI host device registered (name=vmci, major=10, minor=118) > Initialized host personality > usbcore: registered new interface driver rtsx_usb > usbcore: registered new interface driver viperboard > usbcore: registered new interface driver dln2 > usbcore: registered new interface driver pn533_usb > nfcsim 0.2 initialized > usbcore: registered new interface driver port100 > usbcore: registered new interface driver nfcmrvl > Loading iSCSI transport class v2.0-870. > virtio_scsi virtio0: 1/0/0 default/read/poll queues > ------------[ cut here ]------------ > refcount_t: decrement hit 0; leaking memory. > WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:31 > Modules linked in: > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.8.0-rc4-next-20240216-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 > RIP: 0010:refcount_warn_saturate+0xfa/0x1d0 lib/refcount.c:31 > Code: b2 00 00 00 e8 b7 94 f0 fc 5b 5d c3 cc cc cc cc e8 ab 94 f0 fc c6 05 c6 16 ce 0a 01 90 48 c7 c7 a0 5a fe 8b e8 67 69 b4 fc 90 <0f> 0b 90 90 eb d9 e8 8b 94 f0 fc c6 05 a3 16 ce 0a 01 90 48 c7 c7 > RSP: 0000:ffffc90000066e10 EFLAGS: 00010246 > RAX: 15c2c224c9b50400 RBX: ffff888020827d2c RCX: ffff8880162d8000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000004 R08: ffffffff8157b942 R09: fffffbfff1bf95cc > R10: dffffc0000000000 R11: fffffbfff1bf95cc R12: ffffea000502fdc0 > R13: ffffea000502fdc8 R14: 1ffffd4000a05fb9 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffff88823ffff000 CR3: 000000000df32000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > reset_page_owner include/linux/page_owner.h:24 [inline] > free_pages_prepare mm/page_alloc.c:1140 [inline] > __free_pages_ok+0xc42/0xd70 mm/page_alloc.c:1269 > make_alloc_exact+0xc4/0x140 mm/page_alloc.c:4847 > vring_alloc_queue drivers/virtio/virtio_ring.c:319 [inline] Wow this seems to be breakage deep in mm/ - all virtio does is call alloc_pages_exact and that corrupts the refcounts? > vring_alloc_queue_split+0x20a/0x600 drivers/virtio/virtio_ring.c:1108 > vring_create_virtqueue_split+0xc6/0x310 drivers/virtio/virtio_ring.c:1158 > vring_create_virtqueue+0xca/0x110 drivers/virtio/virtio_ring.c:2683 > setup_vq+0xe9/0x2d0 drivers/virtio/virtio_pci_legacy.c:131 > vp_setup_vq+0xbf/0x330 drivers/virtio/virtio_pci_common.c:189 > vp_find_vqs_msix+0x8b2/0xc80 drivers/virtio/virtio_pci_common.c:331 > vp_find_vqs+0x4c/0x4e0 drivers/virtio/virtio_pci_common.c:408 > virtio_find_vqs include/linux/virtio_config.h:233 [inline] > virtscsi_init+0x8db/0xd00 drivers/scsi/virtio_scsi.c:887 > virtscsi_probe+0x3ea/0xf60 drivers/scsi/virtio_scsi.c:945 > virtio_dev_probe+0x991/0xaf0 drivers/virtio/virtio.c:311 > really_probe+0x29e/0xc50 drivers/base/dd.c:658 > __driver_probe_device+0x1a2/0x3e0 drivers/base/dd.c:800 > driver_probe_device+0x50/0x430 drivers/base/dd.c:830 > __driver_attach+0x45f/0x710 drivers/base/dd.c:1216 > bus_for_each_dev+0x239/0x2b0 drivers/base/bus.c:368 > bus_add_driver+0x347/0x620 drivers/base/bus.c:673 > driver_register+0x23a/0x320 drivers/base/driver.c:246 > virtio_scsi_init+0x65/0xe0 drivers/scsi/virtio_scsi.c:1083 > do_one_initcall+0x238/0x830 init/main.c:1233 > do_initcall_level+0x157/0x210 init/main.c:1295 > do_initcalls+0x3f/0x80 init/main.c:1311 > kernel_init_freeable+0x435/0x5d0 init/main.c:1543 > kernel_init+0x1d/0x2b0 init/main.c:1432 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 > </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@xxxxxxxxxxxxxxxx. > > 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
