syzbot


WARNING in ifs_free

Status: upstream: reported on 2026/01/15 08:12
Subsystems: iomap
[Documentation on labels]
Reported-by: syzbot+d3a62bea0e61f9d121da@syzkaller.appspotmail.com
First crash: 19d, last: 10h59m
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [iomap?] WARNING in ifs_free 0 (1) 2026/01/15 08:12

Sample crash report:
------------[ cut here ]------------
ifs_is_fully_uptodate(folio, ifs) != folio_test_uptodate(folio)
WARNING: fs/iomap/buffered-io.c:256 at ifs_free+0x358/0x420 fs/iomap/buffered-io.c:255, CPU#1: syz-executor/8453
Modules linked in:
CPU: 1 UID: 0 PID: 8453 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ifs_free+0x358/0x420 fs/iomap/buffered-io.c:255
Code: 41 5f 5d e9 2a 77 be ff e8 a5 26 61 ff 90 0f 0b 90 e9 d0 fe ff ff e8 97 26 61 ff 90 0f 0b 90 e9 0a ff ff ff e8 89 26 61 ff 90 <0f> 0b 90 eb c3 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 06 fe ff ff
RSP: 0018:ffffc9000ba2f688 EFLAGS: 00010293
RAX: ffffffff8263c2f7 RBX: 0000000000000008 RCX: ffff88801db5bc80
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: 0000000082643c01 R08: ffffea0001ac1d07 R09: 1ffffd40003583a0
R10: dffffc0000000000 R11: fffff940003583a1 R12: ffff8880605aa9c4
R13: ffff8880605aa980 R14: ffffea0001ac1d00 R15: 1ffffd40003583a1
FS:  0000555559610500(0000) GS:ffff8881253a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffce8112db0 CR3: 00000000744f0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 folio_invalidate mm/truncate.c:140 [inline]
 truncate_cleanup_folio+0xcb/0x190 mm/truncate.c:160
 truncate_inode_pages_range+0x2ce/0xe30 mm/truncate.c:404
 ntfs_evict_inode+0x19/0x40 fs/ntfs3/inode.c:1798
 evict+0x61e/0xb10 fs/inode.c:846
 dispose_list fs/inode.c:888 [inline]
 evict_inodes+0x75a/0x7f0 fs/inode.c:942
 generic_shutdown_super+0xaa/0x2d0 fs/super.c:632
 kill_block_super+0x44/0x90 fs/super.c:1725
 ntfs3_kill_sb+0x44/0x1c0 fs/ntfs3/super.c:1860
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f559ed9c117
Code: a2 c7 05 7c 94 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffce8113408 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f559ee0471f RCX: 00007f559ed9c117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffce81134c0
RBP: 00007ffce81134c0 R08: 00007ffce81144c0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce8114550
R13: 00007f559ee0471f R14: 0000000000042482 R15: 00007ffce8114590
 </TASK>

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/30 17:45 linux-next 33a647c659ff e01a0ca6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ifs_free
2026/01/30 04:54 linux-next 33a647c659ff bfa73b7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ifs_free
2026/01/29 18:42 linux-next 33a647c659ff aeb6fdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ifs_free
2026/01/28 09:19 linux-next 4f938c7d3b25 3029c699 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ifs_free
2026/01/27 09:31 linux-next 615aad0f61e0 efb3e894 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ifs_free
2026/01/11 08:08 linux-next f417b7ffcbef d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ifs_free
2026/01/11 08:07 linux-next f417b7ffcbef d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in ifs_free
* Struck through repros no longer work on HEAD.