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Message-ID: <CAOQ4uxjY_On6FkkR1YHT2TSUhq=JX2X9ChPg9XgjJuQoAZ3hzg@mail.gmail.com> Date: Fri, 12 Apr 2024 10:52:59 +0300 From: Amir Goldstein <amir73il@...il.com> To: syzbot <syzbot+5e3f9b2a67b45f16d4e6@...kaller.appspotmail.com> Cc: jack@...e.cz, krisman@...e.de, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, repnop@...gle.com, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [ext4?] KASAN: slab-use-after-free Read in fsnotify On Thu, Apr 11, 2024 at 11:06 PM syzbot <syzbot+5e3f9b2a67b45f16d4e6@...kaller.appspotmail.com> wrote: > > Hello, > > syzbot tried to test the proposed patch but the build/boot failed: > > viperboard > [ 7.499011][ T1] usbcore: registered new interface driver dln2 > [ 7.500804][ T1] usbcore: registered new interface driver pn533_usb > [ 7.507181][ T1] nfcsim 0.2 initialized > [ 7.508964][ T1] usbcore: registered new interface driver port100 > [ 7.511844][ T1] usbcore: registered new interface driver nfcmrvl > [ 7.519814][ T1] Loading iSCSI transport class v2.0-870. > [ 7.539126][ T1] virtio_scsi virtio0: 1/0/0 default/read/poll queues > [ 7.550224][ T1] ------------[ cut here ]------------ > [ 7.551264][ T1] refcount_t: decrement hit 0; leaking memory. > [ 7.552627][ T1] WARNING: CPU: 0 PID: 1 at lib/refcount.c:31 refcount_warn_saturate+0xfa/0x1d0 > [ 7.554218][ T1] Modules linked in: > [ 7.554791][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc3-syzkaller-00014-geb06a4b6cca5 #0 > [ 7.556609][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > [ 7.558128][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0 > [ 7.559937][ T1] Code: b2 00 00 00 e8 87 70 e7 fc 5b 5d c3 cc cc cc cc e8 7b 70 e7 fc c6 05 0c 5d e5 0a 01 90 48 c7 c7 40 4b 1f 8c e8 17 ee a9 fc 90 <0f> 0b 90 90 eb d9 e8 5b 70 e7 fc c6 05 e9 5c e5 0a 01 90 48 c7 c7 > [ 7.563097][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246 > [ 7.564240][ T1] RAX: 6f40bd285f2a6000 RBX: ffff888147ed00fc RCX: ffff8880166d0000 > [ 7.565743][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > [ 7.567236][ T1] RBP: 0000000000000004 R08: ffffffff815800a2 R09: fffffbfff1c39af8 > [ 7.568531][ T1] R10: dffffc0000000000 R11: fffffbfff1c39af8 R12: ffffea000503edc0 > [ 7.570021][ T1] R13: ffffea000503edc8 R14: 1ffffd4000a07db9 R15: 0000000000000000 > [ 7.571764][ T1] FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > [ 7.573270][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 7.574232][ T1] CR2: ffff88823ffff000 CR3: 000000000e134000 CR4: 00000000003506f0 > [ 7.575566][ T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 7.576737][ T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 7.578004][ T1] Call Trace: > [ 7.578712][ T1] <TASK> > [ 7.579189][ T1] ? __warn+0x163/0x4e0 > [ 7.580052][ T1] ? refcount_warn_saturate+0xfa/0x1d0 > [ 7.580896][ T1] ? report_bug+0x2b3/0x500 > [ 7.581593][ T1] ? refcount_warn_saturate+0xfa/0x1d0 > [ 7.582383][ T1] ? handle_bug+0x3e/0x70 > [ 7.583169][ T1] ? exc_invalid_op+0x1a/0x50 > [ 7.584335][ T1] ? asm_exc_invalid_op+0x1a/0x20 > [ 7.585285][ T1] ? __warn_printk+0x292/0x360 > [ 7.586058][ T1] ? refcount_warn_saturate+0xfa/0x1d0 > [ 7.586882][ T1] ? refcount_warn_saturate+0xf9/0x1d0 > [ 7.587666][ T1] __free_pages_ok+0xc60/0xd90 > [ 7.588339][ T1] make_alloc_exact+0xa3/0xf0 > [ 7.589220][ T1] vring_alloc_queue_split+0x20a/0x600 > [ 7.590378][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10 > [ 7.591429][ T1] ? vp_find_vqs+0x4c/0x4e0 > [ 7.592174][ T1] ? virtscsi_probe+0x3ea/0xf60 > [ 7.592853][ T1] ? virtio_dev_probe+0x991/0xaf0 > [ 7.593892][ T1] ? really_probe+0x2b8/0xad0 > [ 7.594581][ T1] ? driver_probe_device+0x50/0x430 > [ 7.595325][ T1] vring_create_virtqueue_split+0xc6/0x310 > [ 7.596200][ T1] ? ret_from_fork+0x4b/0x80 > [ 7.597705][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10 > [ 7.599051][ T1] vring_create_virtqueue+0xca/0x110 > [ 7.599905][ T1] ? __pfx_vp_notify+0x10/0x10 > [ 7.600626][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.601770][ T1] setup_vq+0xe9/0x2d0 > [ 7.602429][ T1] ? __pfx_vp_notify+0x10/0x10 > [ 7.603153][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.604003][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.604758][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.605623][ T1] vp_setup_vq+0xbf/0x330 > [ 7.606388][ T1] ? __pfx_vp_config_changed+0x10/0x10 > [ 7.607239][ T1] ? ioread16+0x2f/0x90 > [ 7.608129][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.609047][ T1] vp_find_vqs_msix+0x8b2/0xc80 > [ 7.609880][ T1] vp_find_vqs+0x4c/0x4e0 > [ 7.610578][ T1] virtscsi_init+0x8db/0xd00 > [ 7.611247][ T1] ? __pfx_virtscsi_init+0x10/0x10 > [ 7.612058][ T1] ? __pfx_default_calc_sets+0x10/0x10 > [ 7.612860][ T1] ? scsi_host_alloc+0xa57/0xea0 > [ 7.613671][ T1] ? vp_get+0xfd/0x140 > [ 7.614243][ T1] virtscsi_probe+0x3ea/0xf60 > [ 7.614969][ T1] ? __pfx_virtscsi_probe+0x10/0x10 > [ 7.615847][ T1] ? kernfs_add_one+0x156/0x8b0 > [ 7.616678][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10 > [ 7.617627][ T1] ? virtio_features_ok+0x10c/0x270 > [ 7.618392][ T1] virtio_dev_probe+0x991/0xaf0 > [ 7.619262][ T1] ? __pfx_virtio_dev_probe+0x10/0x10 > [ 7.620216][ T1] really_probe+0x2b8/0xad0 > [ 7.621124][ T1] __driver_probe_device+0x1a2/0x390 > [ 7.621980][ T1] driver_probe_device+0x50/0x430 > [ 7.622710][ T1] __driver_attach+0x45f/0x710 > [ 7.623413][ T1] ? __pfx___driver_attach+0x10/0x10 > [ 7.624299][ T1] bus_for_each_dev+0x239/0x2b0 > [ 7.625118][ T1] ? __pfx___driver_attach+0x10/0x10 > [ 7.625993][ T1] ? __pfx_bus_for_each_dev+0x10/0x10 > [ 7.626858][ T1] ? do_raw_spin_unlock+0x13c/0x8b0 > [ 7.627837][ T1] bus_add_driver+0x347/0x620 > [ 7.628735][ T1] driver_register+0x23a/0x320 > [ 7.629982][ T1] ? __pfx_virtio_scsi_init+0x10/0x10 > [ 7.631006][ T1] virtio_scsi_init+0x65/0xe0 > [ 7.631802][ T1] ? __pfx_virtio_scsi_init+0x10/0x10 > [ 7.632612][ T1] do_one_initcall+0x248/0x880 > [ 7.633404][ T1] ? __pfx_virtio_scsi_init+0x10/0x10 > [ 7.634540][ T1] ? __pfx_do_one_initcall+0x10/0x10 > [ 7.635786][ T1] ? lockdep_hardirqs_on_prepare+0x43d/0x780 > [ 7.636889][ T1] ? __pfx_parse_args+0x10/0x10 > [ 7.637652][ T1] ? do_initcalls+0x1c/0x80 > [ 7.638456][ T1] ? rcu_is_watching+0x15/0xb0 > [ 7.639227][ T1] do_initcall_level+0x157/0x210 > [ 7.640192][ T1] do_initcalls+0x3f/0x80 > [ 7.640818][ T1] kernel_init_freeable+0x435/0x5d0 > [ 7.641593][ T1] ? __pfx_kernel_init_freeable+0x10/0x10 > [ 7.642546][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 > [ 7.643506][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.644295][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.645313][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.646036][ T1] kernel_init+0x1d/0x2b0 > [ 7.646660][ T1] ret_from_fork+0x4b/0x80 > [ 7.647368][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.648542][ T1] ret_from_fork_asm+0x1a/0x30 > [ 7.649812][ T1] </TASK> > [ 7.650346][ T1] Kernel panic - not syncing: kernel: panic_on_warn set ... > [ 7.651620][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.9.0-rc3-syzkaller-00014-geb06a4b6cca5 #0 > [ 7.653389][ T1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > [ 7.655321][ T1] Call Trace: > [ 7.655801][ T1] <TASK> > [ 7.656252][ T1] dump_stack_lvl+0x241/0x360 > [ 7.657006][ T1] ? __pfx_dump_stack_lvl+0x10/0x10 > [ 7.657825][ T1] ? __pfx__printk+0x10/0x10 > [ 7.658542][ T1] ? _printk+0xd5/0x120 > [ 7.659343][ T1] ? vscnprintf+0x5d/0x90 > [ 7.659705][ T1] panic+0x349/0x860 > [ 7.659705][ T1] ? __warn+0x172/0x4e0 > [ 7.659705][ T1] ? __pfx_panic+0x10/0x10 > [ 7.659705][ T1] ? show_trace_log_lvl+0x4e6/0x520 > [ 7.659705][ T1] ? ret_from_fork_asm+0x1a/0x30 > [ 7.659705][ T1] __warn+0x346/0x4e0 > [ 7.659705][ T1] ? refcount_warn_saturate+0xfa/0x1d0 > [ 7.659705][ T1] report_bug+0x2b3/0x500 > [ 7.659705][ T1] ? refcount_warn_saturate+0xfa/0x1d0 > [ 7.659705][ T1] handle_bug+0x3e/0x70 > [ 7.659705][ T1] exc_invalid_op+0x1a/0x50 > [ 7.659705][ T1] asm_exc_invalid_op+0x1a/0x20 > [ 7.659705][ T1] RIP: 0010:refcount_warn_saturate+0xfa/0x1d0 > [ 7.659705][ T1] Code: b2 00 00 00 e8 87 70 e7 fc 5b 5d c3 cc cc cc cc e8 7b 70 e7 fc c6 05 0c 5d e5 0a 01 90 48 c7 c7 40 4b 1f 8c e8 17 ee a9 fc 90 <0f> 0b 90 90 eb d9 e8 5b 70 e7 fc c6 05 e9 5c e5 0a 01 90 48 c7 c7 > [ 7.659705][ T1] RSP: 0000:ffffc90000066e18 EFLAGS: 00010246 > [ 7.659705][ T1] RAX: 6f40bd285f2a6000 RBX: ffff888147ed00fc RCX: ffff8880166d0000 > [ 7.659705][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > [ 7.659705][ T1] RBP: 0000000000000004 R08: ffffffff815800a2 R09: fffffbfff1c39af8 > [ 7.659705][ T1] R10: dffffc0000000000 R11: fffffbfff1c39af8 R12: ffffea000503edc0 > [ 7.659705][ T1] R13: ffffea000503edc8 R14: 1ffffd4000a07db9 R15: 0000000000000000 > [ 7.659705][ T1] ? __warn_printk+0x292/0x360 > [ 7.659705][ T1] ? refcount_warn_saturate+0xf9/0x1d0 > [ 7.659705][ T1] __free_pages_ok+0xc60/0xd90 > [ 7.659705][ T1] make_alloc_exact+0xa3/0xf0 > [ 7.659705][ T1] vring_alloc_queue_split+0x20a/0x600 > [ 7.659705][ T1] ? __pfx_vring_alloc_queue_split+0x10/0x10 > [ 7.659705][ T1] ? vp_find_vqs+0x4c/0x4e0 > [ 7.659705][ T1] ? virtscsi_probe+0x3ea/0xf60 > [ 7.659705][ T1] ? virtio_dev_probe+0x991/0xaf0 > [ 7.659705][ T1] ? really_probe+0x2b8/0xad0 > [ 7.659705][ T1] ? driver_probe_device+0x50/0x430 > [ 7.659705][ T1] vring_create_virtqueue_split+0xc6/0x310 > [ 7.659705][ T1] ? ret_from_fork+0x4b/0x80 > [ 7.659705][ T1] ? __pfx_vring_create_virtqueue_split+0x10/0x10 > [ 7.659705][ T1] vring_create_virtqueue+0xca/0x110 > [ 7.659705][ T1] ? __pfx_vp_notify+0x10/0x10 > [ 7.659705][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.659705][ T1] setup_vq+0xe9/0x2d0 > [ 7.659705][ T1] ? __pfx_vp_notify+0x10/0x10 > [ 7.659705][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.659705][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.659705][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.659705][ T1] vp_setup_vq+0xbf/0x330 > [ 7.659705][ T1] ? __pfx_vp_config_changed+0x10/0x10 > [ 7.659705][ T1] ? ioread16+0x2f/0x90 > [ 7.659705][ T1] ? __pfx_virtscsi_ctrl_done+0x10/0x10 > [ 7.709861][ T1] vp_find_vqs_msix+0x8b2/0xc80 > [ 7.709861][ T1] vp_find_vqs+0x4c/0x4e0 > [ 7.709861][ T1] virtscsi_init+0x8db/0xd00 > [ 7.709861][ T1] ? __pfx_virtscsi_init+0x10/0x10 > [ 7.709861][ T1] ? __pfx_default_calc_sets+0x10/0x10 > [ 7.709861][ T1] ? scsi_host_alloc+0xa57/0xea0 > [ 7.709861][ T1] ? vp_get+0xfd/0x140 > [ 7.709861][ T1] virtscsi_probe+0x3ea/0xf60 > [ 7.709861][ T1] ? __pfx_virtscsi_probe+0x10/0x10 > [ 7.709861][ T1] ? kernfs_add_one+0x156/0x8b0 > [ 7.709861][ T1] ? virtio_no_restricted_mem_acc+0x9/0x10 > [ 7.709861][ T1] ? virtio_features_ok+0x10c/0x270 > [ 7.709861][ T1] virtio_dev_probe+0x991/0xaf0 > [ 7.709861][ T1] ? __pfx_virtio_dev_probe+0x10/0x10 > [ 7.709861][ T1] really_probe+0x2b8/0xad0 > [ 7.709861][ T1] __driver_probe_device+0x1a2/0x390 > [ 7.709861][ T1] driver_probe_device+0x50/0x430 > [ 7.709861][ T1] __driver_attach+0x45f/0x710 > [ 7.709861][ T1] ? __pfx___driver_attach+0x10/0x10 > [ 7.709861][ T1] bus_for_each_dev+0x239/0x2b0 > [ 7.709861][ T1] ? __pfx___driver_attach+0x10/0x10 > [ 7.709861][ T1] ? __pfx_bus_for_each_dev+0x10/0x10 > [ 7.709861][ T1] ? do_raw_spin_unlock+0x13c/0x8b0 > [ 7.709861][ T1] bus_add_driver+0x347/0x620 > [ 7.709861][ T1] driver_register+0x23a/0x320 > [ 7.709861][ T1] ? __pfx_virtio_scsi_init+0x10/0x10 > [ 7.709861][ T1] virtio_scsi_init+0x65/0xe0 > [ 7.709861][ T1] ? __pfx_virtio_scsi_init+0x10/0x10 > [ 7.709861][ T1] do_one_initcall+0x248/0x880 > [ 7.709861][ T1] ? __pfx_virtio_scsi_init+0x10/0x10 > [ 7.709861][ T1] ? __pfx_do_one_initcall+0x10/0x10 > [ 7.709861][ T1] ? lockdep_hardirqs_on_prepare+0x43d/0x780 > [ 7.709861][ T1] ? __pfx_parse_args+0x10/0x10 > [ 7.709861][ T1] ? do_initcalls+0x1c/0x80 > [ 7.709861][ T1] ? rcu_is_watching+0x15/0xb0 > [ 7.709861][ T1] do_initcall_level+0x157/0x210 > [ 7.709861][ T1] do_initcalls+0x3f/0x80 > [ 7.709861][ T1] kernel_init_freeable+0x435/0x5d0 > [ 7.709861][ T1] ? __pfx_kernel_init_freeable+0x10/0x10 > [ 7.709861][ T1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 > [ 7.709861][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.709861][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.709861][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.709861][ T1] kernel_init+0x1d/0x2b0 > [ 7.709861][ T1] ret_from_fork+0x4b/0x80 > [ 7.709861][ T1] ? __pfx_kernel_init+0x10/0x10 > [ 7.709861][ T1] ret_from_fork_asm+0x1a/0x30 > [ 7.709861][ T1] </TASK> > [ 7.709861][ T1] Kernel Offset: disabled > [ 7.709861][ T1] Rebooting in 86400 seconds.. > > Not sure what this is about. Let's try again after rebase to current master: #syz test: https://github.com/amir73il/linux fsnotify-fixes Thanks, Amir.
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