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KMSAN: uninit-value in extent_fiemap

Status: upstream: reported on 2023/03/06 17:56
Subsystems: btrfs (incorrect?)
Reported-by: syzbot+8d245945ddc97769435f@syzkaller.appspotmail.com
First crash: 113d, last: 25d

Sample crash report:
BTRFS info (device loop0): using xxhash64 (xxhash64-generic) checksum algorithm
BTRFS info (device loop0): using free space tree
BTRFS info (device loop0): enabling ssd optimizations
=====================================================
BUG: KMSAN: uninit-value in extent_fiemap+0x2ece/0x6040 fs/btrfs/extent_io.c:3966
 extent_fiemap+0x2ece/0x6040 fs/btrfs/extent_io.c:3966
 btrfs_fiemap+0x20c/0x260 fs/btrfs/inode.c:8126
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x2daa/0x3c20 fs/ioctl.c:810
 __do_compat_sys_ioctl fs/ioctl.c:962 [inline]
 __se_compat_sys_ioctl+0x68c/0xfa0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x8f/0xd0 fs/ioctl.c:910
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was stored to memory at:
 read_extent_buffer fs/btrfs/extent_io.c:5185 [inline]
 btrfs_item_key fs/btrfs/ctree.h:2201 [inline]
 btrfs_item_key_to_cpu fs/btrfs/ctree.h:2306 [inline]
 extent_fiemap+0x2092/0x6040 fs/btrfs/extent_io.c:3965
 btrfs_fiemap+0x20c/0x260 fs/btrfs/inode.c:8126
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x2daa/0x3c20 fs/ioctl.c:810
 __do_compat_sys_ioctl fs/ioctl.c:962 [inline]
 __se_compat_sys_ioctl+0x68c/0xfa0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x8f/0xd0 fs/ioctl.c:910
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5581
 __alloc_pages_bulk+0x1a99/0x2690 mm/page_alloc.c:5506
 alloc_pages_bulk_array include/linux/gfp.h:201 [inline]
 btrfs_alloc_page_array fs/btrfs/extent_io.c:1317 [inline]
 btrfs_clone_extent_buffer+0x48d/0x1230 fs/btrfs/extent_io.c:4303
 fiemap_search_slot fs/btrfs/extent_io.c:3688 [inline]
 extent_fiemap+0x1cf4/0x6040 fs/btrfs/extent_io.c:3940
 btrfs_fiemap+0x20c/0x260 fs/btrfs/inode.c:8126
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x2daa/0x3c20 fs/ioctl.c:810
 __do_compat_sys_ioctl fs/ioctl.c:962 [inline]
 __se_compat_sys_ioctl+0x68c/0xfa0 fs/ioctl.c:910
 __ia32_compat_sys_ioctl+0x8f/0xd0 fs/ioctl.c:910
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 0 PID: 6991 Comm: syz-executor.0 Not tainted 6.1.0-rc7-syzkaller-63931-g49a9a20768f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
=====================================================

Crashes (13):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kmsan-gce-386 2022/12/02 11:56 https://github.com/google/kmsan.git master 49a9a20768f5 e080de16 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in extent_fiemap
ci-upstream-kmsan-gce-386 2023/02/28 14:12 https://github.com/google/kmsan.git master 97e36f4aa06f 95aee97a .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2023/02/16 19:22 https://github.com/google/kmsan.git master 9c866a280876 7338e3c4 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2023/02/04 23:05 https://github.com/google/kmsan.git master eda666ff2276 be607b78 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in copy_items
ci-upstream-kmsan-gce-386 2023/01/26 06:38 https://github.com/google/kmsan.git master 41c66f470616 9dfcf09c .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2023/01/14 09:28 https://github.com/google/kmsan.git master e919e2b1bc1c 529798b0 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2023/01/12 17:12 https://github.com/google/kmsan.git master 219e919e391d 96166539 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2023/01/04 13:34 https://github.com/google/kmsan.git master 5c6259d6d19f 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in copy_items
ci-upstream-kmsan-gce-386 2022/12/24 08:16 https://github.com/google/kmsan.git master 5c6259d6d19f 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2022/12/19 11:37 https://github.com/google/kmsan.git master 5c6259d6d19f 05494336 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2022/12/19 11:30 https://github.com/google/kmsan.git master 5c6259d6d19f 05494336 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2022/12/15 05:10 https://github.com/google/kmsan.git master 5c6259d6d19f b18f0a64 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
ci-upstream-kmsan-gce-386 2022/12/15 04:57 https://github.com/google/kmsan.git master 5c6259d6d19f b18f0a64 .config console log report info [disk image] [vmlinux] [kernel image] KMSAN: uninit-value in paths_from_inode
* Struck through repros no longer work on HEAD.