From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C103E2BCF6C for ; Sat, 14 Feb 2026 19:58:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771099119; cv=none; b=TnjT7Kp7QeBEgh2Ev3oPl6CkYB0083iIyXEQouNaXYXB1S8tBUpW1rwcrdtpY/NcTIi+QtHkyxMU2v9X9PIbW1CLs6Pcx32knS/shFxNvniegDTVo+t/CmWj3wiM8/XJjOJnu0J3DjMwLN12GBTNPFziEQFRCT1RjCE1lBXBTIc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771099119; c=relaxed/simple; bh=kZMupmOdEg7g7ElhrfbguwS/d3ptIJhrxI6Q2pDhBZY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=A1OsglZC4DxhGc4n5cTxMXqL1fQkcRUf//BBuTK1m4tQWqnokjb65l1fld9r+LBTtHOqnES9q5CjKRQMH0iHL3Z0uIxM+d42q6kJmwtL1xTH8PMuHVeqESTc8wHaHlVfSNrmqZK+p6k7F8xN+Wt71h2MGO+HN0UEqQpsLRiT5wo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f72.google.com with SMTP id 006d021491bc7-66304fd6389so9443420eaf.1 for ; Sat, 14 Feb 2026 11:58:37 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771099117; x=1771703917; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=bsfVjpTU3pyec+nQ2qpW1XWMu/ykIzLRTh3lXAZRdMY=; b=W9KPK0w/nVs+CINGoysa2ba3+72GF/AVJYbdBY6dBzvnb1pmgKYOWJFFmZHg6JH7iL M46OJh8hpC8mkApqbdHgO5rm8XjV6h0acnNHHW0fPMPgQ4A/yI8H9vDGx0XM2EXFLs34 zN9l9IIcKhD2357bj+7Ihj/kvhBtRZj6R0Fe6pqa+32eDq2WmPXcmh0swnPCb2wbQ4Ow llHrQbPvA6xJTLxUux/dqw6tADjJvs3bicyQTxMhBD1JKZ8YenA22v7KmbEcS/eHmRyU Di3oAz08a5GCoWYxvJolpuWBR1/W374TDDvJccMj71CwjzWXheabYvWH/8eQOlQRAKoU 13cQ== X-Forwarded-Encrypted: i=1; AJvYcCVuGjHn2HTLcejhhos1uhJ6HpxQNm9lcplivpwMl14t8g0rfzvnDdM1IfDIJdpWoEYI0exf1Ox6tiHn0eg=@vger.kernel.org X-Gm-Message-State: AOJu0Yz4tbDVc1GBi99+8e3GTH2kYi4+pnGY2mlBslmJSxxEs4soP6lP sr89U/NHJneLgA5+7/bwUtoGraRuxbAGCYA1GRARZuWT+pTrTDuntzk5YzhS+LRGi+mVoZoNiE0 7DdakpFiaISMwuoWV/S2AThx6ILdhTyOPBQX0ycs4S3L2YcUPE6lzKRC5vT0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2906:b0:674:3230:ff1c with SMTP id 006d021491bc7-6785c51090fmr1648545eaf.80.1771099116778; Sat, 14 Feb 2026 11:58:36 -0800 (PST) Date: Sat, 14 Feb 2026 11:58:36 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6990d3ec.a70a0220.2c38d7.00d2.GAE@google.com> Subject: [syzbot] [xfs?] KASAN: slab-use-after-free Read in fserror_worker From: syzbot To: cem@kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: dc855b77719f Merge tag 'irq-drivers-2026-02-09' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d8ccaa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d3f400265d9837ec dashboard link: https://syzkaller.appspot.com/bug?extid=fbf6ff30de890ff32ec5 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=173a5b22580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1648d7fa580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-dc855b77.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9b3fb6cba25b/vmlinux-dc855b77.xz kernel image: https://storage.googleapis.com/syzbot-assets/1e986cdef5ea/bzImage-dc855b77.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e278523ff18b/mount_1.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=1599365a580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fbf6ff30de890ff32ec5@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in inode_state_read_once include/linux/fs.h:884 [inline] BUG: KASAN: slab-use-after-free in iput+0x3a7/0xe80 fs/inode.c:1977 Read of size 4 at addr ffff88800ba8efb8 by task kworker/0:2/54 CPU: 0 UID: 0 PID: 54 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events fserror_worker Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 inode_state_read_once include/linux/fs.h:884 [inline] iput+0x3a7/0xe80 fs/inode.c:1977 fserror_worker+0x230/0x350 fs/fserror.c:69 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Allocated by task 5498: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_lru_noprof+0x35f/0x6c0 mm/slub.c:5282 xfs_inode_alloc+0x7e/0x710 fs/xfs/xfs_icache.c:97 xfs_iget_cache_miss fs/xfs/xfs_icache.c:635 [inline] xfs_iget+0xa85/0x2ce0 fs/xfs/xfs_icache.c:799 xfs_lookup+0x321/0x630 fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x130/0x200 fs/xfs/xfs_iops.c:327 __lookup_slow+0x2b7/0x410 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 ovl_lookup_positive_unlocked fs/overlayfs/namei.c:210 [inline] ovl_lookup_single+0x32f/0xea0 fs/overlayfs/namei.c:254 ovl_lookup_layer+0x377/0x450 fs/overlayfs/namei.c:359 ovl_lookup_layers fs/overlayfs/namei.c:1103 [inline] ovl_lookup+0x5f2/0x1c80 fs/overlayfs/namei.c:1397 lookup_one_qstr_excl+0x131/0x360 fs/namei.c:1805 __start_renaming+0x1db/0x410 fs/namei.c:3862 filename_renameat2+0x38c/0x9c0 fs/namei.c:6119 __do_sys_renameat2 fs/namei.c:6173 [inline] __se_sys_renameat2+0x5a/0x2c0 fs/namei.c:6168 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5498: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6674 [inline] kmem_cache_free+0x195/0x610 mm/slub.c:6789 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 xfs_iget_cache_miss fs/xfs/xfs_icache.c:740 [inline] xfs_iget+0xb01/0x2ce0 fs/xfs/xfs_icache.c:799 xfs_lookup+0x321/0x630 fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x130/0x200 fs/xfs/xfs_iops.c:327 __lookup_slow+0x2b7/0x410 fs/namei.c:1916 lookup_slow+0x53/0x70 fs/namei.c:1933 ovl_lookup_positive_unlocked fs/overlayfs/namei.c:210 [inline] ovl_lookup_single+0x32f/0xea0 fs/overlayfs/namei.c:254 ovl_lookup_layer+0x377/0x450 fs/overlayfs/namei.c:359 ovl_lookup_layers fs/overlayfs/namei.c:1103 [inline] ovl_lookup+0x5f2/0x1c80 fs/overlayfs/namei.c:1397 lookup_one_qstr_excl+0x131/0x360 fs/namei.c:1805 __start_renaming+0x1db/0x410 fs/namei.c:3862 filename_renameat2+0x38c/0x9c0 fs/namei.c:6119 __do_sys_renameat2 fs/namei.c:6173 [inline] __se_sys_renameat2+0x5a/0x2c0 fs/namei.c:6168 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88800ba8ed00 which belongs to the cache xfs_inode of size 1784 The buggy address is located 696 bytes inside of freed 1784-byte region [ffff88800ba8ed00, ffff88800ba8f3f8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xba8c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8880125ab781 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88803139da00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080080008 00000000f5000000 ffff8880125ab781 head: 00fff00000000040 ffff88803139da00 dead000000000122 0000000000000000 head: 0000000000000000 0000000080080008 00000000f5000000 ffff8880125ab781 head: 00fff00000000002 ffffea00002ea301 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5498, tgid 5497 (syz.0.17), ts 109700745240, free_ts 106973924123 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3a0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xd90/0x1790 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_lru_noprof+0x3ed/0x6c0 mm/slub.c:5282 xfs_inode_alloc+0x7e/0x710 fs/xfs/xfs_icache.c:97 xfs_iget_cache_miss fs/xfs/xfs_icache.c:635 [inline] xfs_iget+0xa85/0x2ce0 fs/xfs/xfs_icache.c:799 xfs_icreate+0xbe/0x170 fs/xfs/xfs_inode.c:600 xfs_create+0x648/0xae0 fs/xfs/xfs_inode.c:721 xfs_generic_create+0x410/0xb30 fs/xfs/xfs_iops.c:216 xfs_vn_mkdir+0x37/0x50 fs/xfs/xfs_iops.c:309 vfs_mkdir+0x413/0x630 fs/namei.c:5233 filename_mkdirat+0x285/0x510 fs/namei.c:5266 page last free pid 5456 tgid 5456 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xbf8/0xd70 mm/page_alloc.c:2973 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 __slab_free+0x294/0x320 mm/slub.c:5956 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x427/0x6f0 mm/slub.c:5315 __alloc_skb+0x1d7/0x390 net/core/skbuff.c:679 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] netlink_ack+0x146/0xa50 net/netlink/af_netlink.c:2487 netlink_rcv_skb+0x2b6/0x4b0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] __sys_sendto+0x709/0x7a0 net/socket.c:2206 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2209 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88800ba8ee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800ba8ef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88800ba8ef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88800ba8f000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800ba8f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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@googlegroups.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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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