syzbot


WARNING in ifs_free

Status: upstream: reported C repro on 2026/01/15 08:12
Subsystems: ntfs3 iomap
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+d3a62bea0e61f9d121da@syzkaller.appspotmail.com
First crash: 182d, last: 8h45m
Cause bisection: failed (error log, bisect log)
  
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ID Workflow Result Correct Bug Created Started Finished Revision Error
59ca75d0-a62f-4f7f-9d44-37f11507a45e assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in ifs_free 2026/05/17 09:31 2026/05/17 09:31 2026/05/17 10:26 de5aae85e5f28e2fa1c7deefcc24fe286abe5140

			
		
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[syzbot] [iomap?] WARNING in ifs_free 2 (4) 2026/02/20 17:07

Sample crash report:
------------[ cut here ]------------
ifs_is_fully_uptodate(folio, ifs) != folio_test_uptodate(folio)
WARNING: fs/iomap/buffered-io.c:265 at ifs_free+0x34a/0x410 fs/iomap/buffered-io.c:264, CPU#0: syz-executor/5750
Modules linked in:
CPU: 0 UID: 0 PID: 5750 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:ifs_free+0x34a/0x410 fs/iomap/buffered-io.c:264
Code: 41 5f 5d e9 18 a3 c2 ff e8 73 15 65 ff 90 0f 0b 90 e9 d5 fe ff ff e8 65 15 65 ff 90 0f 0b 90 e9 12 ff ff ff e8 57 15 65 ff 90 <0f> 0b 90 eb c7 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 08 fe ff ff
RSP: 0018:ffffc90003f5f698 EFLAGS: 00010293
RAX: ffffffff826032b9 RBX: 0000000000000008 RCX: ffff888039998000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000008260b001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff9400025f989 R12: ffff88801ab79084
R13: ffff88801ab79000 R14: ffffea00012fcc40 R15: 0000000000000000
FS:  0000555593e84500(0000) GS:ffff888126117000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff84b2df000 CR3: 0000000036ebc000 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+0x2c4/0xd80 mm/truncate.c:404
 ntfs_evict_inode+0x19/0x40 fs/ntfs3/inode.c:1797
 evict+0x624/0xb50 fs/inode.c:825
 dispose_list fs/inode.c:867 [inline]
 evict_inodes+0x7e3/0x870 fs/inode.c:921
 generic_shutdown_super+0xaa/0x2d0 fs/super.c:633
 kill_block_super+0x44/0x90 fs/super.c:1665
 ntfs3_kill_sb+0x44/0x1c0 fs/ntfs3/super.c:1915
 deactivate_locked_super+0xbc/0x130 fs/super.c:477
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
 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:70 [inline]
 exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f549a7be097
Code: a2 c7 05 5c 06 25 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:00007ffded8c4e38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f549a8522ca RCX: 00007f549a7be097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffded8c4ef0
RBP: 00007ffded8c4ef0 R08: 00007ffded8c5ef0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffded8c5f80
R13: 00007f549a8522ca R14: 000000000002404f R15: 00007ffded8c5fc0
 </TASK>

Crashes (1210):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/27 04:37 upstream 51cb1aa1250c fb92f11c .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (corrupt fs)] [mounted in repro #3] [mounted in repro #4] ci2-upstream-fs WARNING in ifs_free
2026/05/17 06:07 upstream 6916d5703ddf de5aae85 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in ifs_free
2026/02/20 09:50 upstream 8bf22c33e7a1 17d780d6 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs WARNING in ifs_free
2026/02/19 20:51 upstream 2b7a25df823d 73a252ac .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root WARNING in ifs_free
2026/07/12 04:59 upstream cab9e339cfbc d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ifs_free
2026/07/11 23:26 upstream dd3210c47e8d d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/11 21:00 upstream cab9e339cfbc d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ifs_free
2026/07/11 17:13 upstream d96fcfe1b7f9 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ifs_free
2026/07/11 08:52 upstream 61c03dfde854 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/11 08:51 upstream 61c03dfde854 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/10 23:56 upstream d96fcfe1b7f9 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/10 20:10 upstream d96fcfe1b7f9 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/10 17:18 upstream a635d6748234 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/10 11:01 upstream a635d6748234 4167ee25 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/10 08:25 upstream a635d6748234 4167ee25 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/10 07:14 upstream 2c7c88a412aa 4167ee25 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ifs_free
2026/07/10 04:36 upstream a635d6748234 4167ee25 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/09 23:53 upstream 2c7c88a412aa a0c310a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/09 21:42 upstream 2c7c88a412aa a0c310a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/09 11:28 upstream 0e35b9b6ec0f b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/09 10:12 upstream 0e35b9b6ec0f b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/09 07:23 upstream 0e35b9b6ec0f b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in ifs_free
2026/07/09 04:40 upstream 0e35b9b6ec0f b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/09 01:09 upstream 0e35b9b6ec0f b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/08 14:06 upstream 0e35b9b6ec0f 88a4b44c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/08 04:59 upstream 0e35b9b6ec0f 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/08 01:28 upstream 0e35b9b6ec0f 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/07 10:17 upstream 0e35b9b6ec0f 8e71ce95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/06 17:35 upstream 8cdeaa50eae8 88b240e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/06 04:29 upstream f105f3631d51 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/05 21:35 upstream f105f3631d51 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/05 13:50 upstream 7404ce516372 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/05 11:51 upstream 7404ce516372 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/04 08:42 upstream 71dfdfb0209b fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/04 02:59 upstream 71dfdfb0209b fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/03 20:37 upstream 71dfdfb0209b 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/03 15:51 upstream 51512e22efe8 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/03 09:27 upstream 51512e22efe8 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/03 08:33 upstream 51512e22efe8 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/02 22:39 upstream 4a50a141f05a 2b70b115 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/01 11:55 upstream 665159e24674 00a5cf1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/07/01 10:27 upstream 665159e24674 00a5cf1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 22:55 upstream dc59e4fea9d8 00e8b0fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 21:23 upstream dc59e4fea9d8 00e8b0fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 18:00 upstream dc59e4fea9d8 00e8b0fd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 11:30 upstream dc59e4fea9d8 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 09:54 upstream dc59e4fea9d8 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 07:27 upstream dc59e4fea9d8 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 04:54 upstream dc59e4fea9d8 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/30 00:04 upstream dc59e4fea9d8 6a0c72dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/06/29 20:14 upstream dc59e4fea9d8 6a0c72dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs WARNING in ifs_free
2026/05/19 19:16 upstream ab5fce87a778 223544dc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in ifs_free
2026/05/18 16:51 upstream 5200f5f493f7 143ffb88 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in ifs_free
2026/06/22 23:22 linux-next 948efecf22e4 5a630be6 .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.