syzbot

 sign-in | mailing list | source | docs
🐞 Open [1644]
≡ Subsystems
🐞 Fixed [6103]
🐞 Invalid [15280]
⬇ Missing Backports [170]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KASAN: use-after-free Read in btrfs_test_super

Status: auto-obsoleted due to no activity on 2023/11/08 06:37
Subsystems: btrfs
[Documentation on labels]
Reported-by: syzbot+65bb53688b6052f09c28@syzkaller.appspotmail.com
First crash: 578d, last: 573d
Cause bisection: introduced by (bisect log) [merge commit]:
commit 68cadad11fe2ddd126b37a8fba3726be7fa0f5c6
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon Aug 28 20:19:28 2023 +0000

  Merge tag 'rcu.2023.08.21a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu

Crash: KASAN: use-after-free Read in btrfs_test_super (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) [merge commit]:
commit 468e28d4ac72869ed6c7cd7c7632008597949bd3
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue Aug 29 18:59:37 2023 +0000

  Merge tag 'v6.6-vfs.super.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [btrfs?] KASAN: use-after-free Read in btrfs_test_super 1 (3) 2023/08/29 14:20
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2023/09/15 04:39 23m retest repro linux-next OK log
2023/09/15 04:39 20m retest repro linux-next OK log
2023/09/14 09:32 29m retest repro upstream OK log
2023/09/14 09:32 28m retest repro upstream OK log
2023/09/13 07:14 18m retest repro upstream OK log
2023/08/29 13:55 20m code@siddh.me https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.super error
2023/08/29 05:08 28m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master OK log

Sample crash report:
loop1: detected capacity change from 0 to 32768
BTRFS: device fsid 24c7a497-3402-47dd-bef8-82358f5f30e0 devid 1 transid 8 /dev/loop1 scanned by syz-executor826 (13741)
==================================================================
BUG: KASAN: use-after-free in btrfs_test_super+0x5b/0x90 fs/btrfs/super.c:1348
Read of size 8 at addr ffff88802b6dd110 by task syz-executor826/13741

CPU: 1 PID: 13741 Comm: syz-executor826 Not tainted 6.5.0-syzkaller-01810-gf97e18a3f2fb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x175/0x1b0 mm/kasan/report.c:588
 btrfs_test_super+0x5b/0x90 fs/btrfs/super.c:1348
 sget+0x127/0x4d0 fs/super.c:861
 btrfs_mount_root+0x5ec/0x910 fs/btrfs/super.c:1508
 legacy_get_tree+0xef/0x190 fs/fs_context.c:638
 vfs_get_tree+0x8c/0x280 fs/super.c:1711
 fc_mount fs/namespace.c:1112 [inline]
 vfs_kern_mount+0xbc/0x150 fs/namespace.c:1142
 btrfs_mount+0x39f/0xb50 fs/btrfs/super.c:1585
 legacy_get_tree+0xef/0x190 fs/fs_context.c:638
 vfs_get_tree+0x8c/0x280 fs/super.c:1711
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3034fbb71a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 0e 06 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3034f76088 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f3034fbb71a
RDX: 0000000020005100 RSI: 0000000020000000 RDI: 00007f3034f760a0
RBP: 00007f3034f760a0 R08: 00007f3034f760e0 R09: 00000000000050e9
R10: 0000000000000080 R11: 0000000000000282 R12: 00007f3034f760e0
R13: 0000000000000080 R14: 0000000000000003 R15: 0000000001000000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0000adb740 refcount:0 mapcount:0 mapping:0000000000000000 index:0x4 pfn:0x2b6dd
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 ffffffff00000201 0000000000000000
raw: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52dc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_ZERO), pid 13699, tgid 13698 (syz-executor826), ts 841664353591, free_ts 842544225107
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_pages_node include/linux/gfp.h:260 [inline]
 __kmalloc_large_node+0x91/0x1d0 mm/slab_common.c:1126
 __do_kmalloc_node mm/slab_common.c:973 [inline]
 __kmalloc_node+0x116/0x230 mm/slab_common.c:992
 kmalloc_node include/linux/slab.h:602 [inline]
 kvmalloc_node+0x72/0x180 mm/util.c:604
 kvmalloc include/linux/slab.h:720 [inline]
 kvzalloc include/linux/slab.h:728 [inline]
 btrfs_mount_root+0x135/0x910 fs/btrfs/super.c:1466
 legacy_get_tree+0xef/0x190 fs/fs_context.c:638
 vfs_get_tree+0x8c/0x280 fs/super.c:1711
 fc_mount fs/namespace.c:1112 [inline]
 vfs_kern_mount+0xbc/0x150 fs/namespace.c:1142
 btrfs_mount+0x39f/0xb50 fs/btrfs/super.c:1585
 legacy_get_tree+0xef/0x190 fs/fs_context.c:638
 vfs_get_tree+0x8c/0x280 fs/super.c:1711
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2348
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2443
 free_large_kmalloc+0xff/0x190 mm/slab_common.c:962
 deactivate_locked_super+0xa5/0x200 fs/super.c:454
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88802b6dd000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802b6dd080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802b6dd100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff88802b6dd180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802b6dd200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (65):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/30 06:30 upstream f97e18a3f2fb ce731e62 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/27 08:19 linux-next 626932085009 03d9c195 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 19:19 upstream 1c59d383390f 7ba13a15 .config console log report syz [mounted in repro] ci-upstream-kasan-badwrites-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 18:41 upstream 1c59d383390f 7ba13a15 .config strace log report syz [mounted in repro] ci-upstream-kasan-gce-selinux-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 05:09 linux-next 2ee82481c392 7ba13a15 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/30 01:57 upstream f97e18a3f2fb ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/30 00:57 upstream f97e18a3f2fb ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/30 00:06 upstream f97e18a3f2fb ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 22:29 upstream f97e18a3f2fb ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 21:28 upstream f97e18a3f2fb ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 20:28 upstream 1c59d383390f ce731e62 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: use-after-free Read in btrfs_test_super
2023/08/29 18:55 upstream f97e18a3f2fb ce731e62 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 18:14 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 17:43 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 17:33 upstream 1c59d383390f 7ba13a15 .config console log report info ci-upstream-kasan-badwrites-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 17:29 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 17:21 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 17:18 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:45 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:37 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:29 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:25 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:24 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:14 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:09 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 15:33 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 13:03 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 12:59 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 12:53 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 12:45 upstream 1c59d383390f 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 12:16 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 12:11 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 12:10 upstream 42a7f6e3ffe0 7ba13a15 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: use-after-free Read in btrfs_test_super
2023/08/29 11:57 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 11:49 upstream 42a7f6e3ffe0 7ba13a15 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: use-after-free Read in btrfs_test_super
2023/08/29 11:38 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 11:28 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 10:20 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 10:14 upstream 1c59d383390f 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 07:36 upstream 727dbda16b83 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 05:45 upstream 727dbda16b83 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 04:29 upstream 42a7f6e3ffe0 7ba13a15 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: use-after-free Read in btrfs_test_super
2023/08/29 04:27 upstream 727dbda16b83 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 03:45 upstream 727dbda16b83 7ba13a15 .config console log report info ci2-upstream-fs KASAN: use-after-free Read in btrfs_test_super
2023/08/29 06:08 upstream 42a7f6e3ffe0 7ba13a15 .config console log report info ci-qemu-upstream-386 KASAN: use-after-free Read in btrfs_test_super
2023/08/29 16:52 linux-next ae782d4e2bf5 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/29 03:33 linux-next 2ee82481c392 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
2023/08/25 03:20 linux-next 2b3bd393093b 49be837e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: use-after-free Read in btrfs_test_super
* Struck through repros no longer work on HEAD.