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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3689:b0:3d0:11ff:a782 with SMTP id e9e14a558f8ab-3d18c231101mr59262605ab.9.1739533322237; Fri, 14 Feb 2025 03:42:02 -0800 (PST) Date: Fri, 14 Feb 2025 03:42:02 -0800 In-Reply-To: <20250214111926.2252-1-hdanton@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67af2c0a.050a0220.21dd3.0043.GAE@google.com> Subject: Re: [syzbot] [netfs?] WARNING: refcount bug in netfs_put_subrequest From: syzbot To: hdanton@sina.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-use-after-free Write in io_submit_one netfs: Couldn't get user pages (rc=-14) ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline] BUG: KASAN: slab-use-after-free in __refcount_sub_and_test include/linux/refcount.h:264 [inline] BUG: KASAN: slab-use-after-free in __refcount_dec_and_test include/linux/refcount.h:307 [inline] BUG: KASAN: slab-use-after-free in refcount_dec_and_test include/linux/refcount.h:325 [inline] BUG: KASAN: slab-use-after-free in iocb_put fs/aio.c:1208 [inline] BUG: KASAN: slab-use-after-free in io_submit_one+0x4e5/0x1da0 fs/aio.c:2055 Write of size 4 at addr ffff88802e13ae88 by task syz.1.40/6596 CPU: 3 UID: 0 PID: 6596 Comm: syz.1.40 Not tainted 6.14.0-rc2-syzkaller-g128c8f96eb86-dirty #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:400 [inline] __refcount_sub_and_test include/linux/refcount.h:264 [inline] __refcount_dec_and_test include/linux/refcount.h:307 [inline] refcount_dec_and_test include/linux/refcount.h:325 [inline] iocb_put fs/aio.c:1208 [inline] io_submit_one+0x4e5/0x1da0 fs/aio.c:2055 __do_sys_io_submit fs/aio.c:2111 [inline] __se_sys_io_submit fs/aio.c:2081 [inline] __x64_sys_io_submit+0x1b2/0x340 fs/aio.c:2081 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8f53d8cde9 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:00007f8f54b7f038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f8f53fa5fa0 RCX: 00007f8f53d8cde9 RDX: 00004000000002c0 RSI: 0000000000000001 RDI: 00007f8f54b5e000 RBP: 00007f8f53e0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8f53fa5fa0 R15: 00007ffeeb0594c8 Allocated by task 6596: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4171 aio_get_req fs/aio.c:1058 [inline] io_submit_one+0x123/0x1da0 fs/aio.c:2048 __do_sys_io_submit fs/aio.c:2111 [inline] __se_sys_io_submit fs/aio.c:2081 [inline] __x64_sys_io_submit+0x1b2/0x340 fs/aio.c:2081 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6596: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kmem_cache_free+0x2e2/0x4d0 mm/slub.c:4711 iocb_destroy fs/aio.c:1110 [inline] iocb_put fs/aio.c:1210 [inline] iocb_put fs/aio.c:1206 [inline] aio_complete_rw+0x3ec/0x7b0 fs/aio.c:1507 netfs_rreq_assess_dio fs/netfs/read_collect.c:379 [inline] netfs_read_collection+0x30fa/0x3cf0 fs/netfs/read_collect.c:442 netfs_wait_for_pause+0x31c/0x3e0 fs/netfs/read_collect.c:693 netfs_dispatch_unbuffered_reads fs/netfs/direct_read.c:106 [inline] netfs_unbuffered_read fs/netfs/direct_read.c:144 [inline] netfs_unbuffered_read_iter_locked+0xb50/0x1610 fs/netfs/direct_read.c:229 netfs_unbuffered_read_iter+0xc5/0x100 fs/netfs/direct_read.c:264 v9fs_file_read_iter+0xbf/0x100 fs/9p/vfs_file.c:361 aio_read+0x313/0x4e0 fs/aio.c:1602 __io_submit_one fs/aio.c:2003 [inline] io_submit_one+0x1580/0x1da0 fs/aio.c:2052 __do_sys_io_submit fs/aio.c:2111 [inline] __se_sys_io_submit fs/aio.c:2081 [inline] __x64_sys_io_submit+0x1b2/0x340 fs/aio.c:2081 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802e13adc0 which belongs to the cache aio_kiocb of size 216 The buggy address is located 200 bytes inside of freed 216-byte region [ffff88802e13adc0, ffff88802e13ae98) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802e13af00 pfn:0x2e13a head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888020025cc0 dead000000000122 0000000000000000 raw: ffff88802e13af00 0000000080190010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff888020025cc0 dead000000000122 0000000000000000 head: ffff88802e13af00 0000000080190010 00000000f5000000 0000000000000000 head: 00fff00000000001 ffffea0000b84e81 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6485, tgid 6484 (syz.1.20), ts 73097474485, free_ts 73096375881 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4739 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2587 [inline] new_slab+0x23d/0x330 mm/slub.c:2640 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] kmem_cache_alloc_noprof+0xfa/0x3d0 mm/slub.c:4171 aio_get_req fs/aio.c:1058 [inline] io_submit_one+0x123/0x1da0 fs/aio.c:2048 __do_sys_io_submit fs/aio.c:2111 [inline] __se_sys_io_submit fs/aio.c:2081 [inline] __x64_sys_io_submit+0x1b2/0x340 fs/aio.c:2081 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 34 tgid 34 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660 rcu_do_batch kernel/rcu/tree.c:2546 [inline] rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2802 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561 run_ksoftirqd kernel/softirq.c:950 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:942 smpboot_thread_fn+0x661/0xa30 kernel/smpboot.c:164 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff88802e13ad80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88802e13ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802e13ae80: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802e13af00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802e13af80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ================================================================== Tested on: commit: 128c8f96 Merge tag 'drm-fixes-2025-02-14' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17c659b0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c09dc55ba7f798e3 dashboard link: https://syzkaller.appspot.com/bug?extid=d9890527385ab9767e03 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=102087df980000