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kernel BUG in filemap_unaccount_folio

Status: upstream: reported C repro on 2023/12/13 08:56
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+3d218f7b6c5511a83a79@syzkaller.appspotmail.com
First crash: 581d, last: 3d07h
Fix commit to backport (bisect log) :
tree: upstream
commit 7d79cd784470395539bda91bf0b3505ff5b2ab6d
Author: Vivek Kasireddy <vivek.kasireddy@intel.com>
Date: Mon Jun 24 06:36:13 2024 +0000

  udmabuf: use vmf_insert_pfn and VM_PFNMAP for handling mmap

  
Fix bisection: the issue occurs on the latest tested release (bisect log)
Crash: kernel BUG in filemap_unaccount_folio (log)
Repro: C syz .config
  
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH v5.4-v6.1] udmabuf: use vmf_insert_pfn and VM_PFNMAP for handling mmap 1 (1) 2024/12/04 15:17
[PATCH v6.6] udmabuf: use vmf_insert_pfn and VM_PFNMAP for handling mmap 1 (1) 2024/12/04 15:17
Please, fix syzbot crash: kernel BUG in filemap_unaccount_folio 1 (1) 2024/12/04 15:17
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/08/09 linux-6.1.y (ToT) 48d525b0e463 C [report] kernel BUG in filemap_unaccount_folio
2024/05/02 upstream (ToT) 0106679839f7 C [report] kernel BUG in filemap_unaccount_folio
2024/08/09 upstream (ToT) ee9a43b7cfe2 C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in filemap_unaccount_folio mm -1 C done error 402 19h14m 679d 0/29 upstream: reported C repro on 2023/09/06 18:51
linux-6.6 kernel BUG in filemap_unaccount_folio -1 4 1d19h 23d 0/2 upstream: reported on 2025/06/24 02:03
upstream kernel BUG in __filemap_get_folio kernel -1 C done 814 1012d 1183d 22/29 fixed on 2023/02/24 13:50
▶ ▼ Fix bisection attempts (6)
Created Duration User Patch Repo Result
2024/08/18 13:55 5h29m fix candidate upstream OK (1) job log
2024/07/15 06:52 3h41m bisect fix linux-6.1.y OK (0) job log log
2024/06/03 05:26 1h30m bisect fix linux-6.1.y OK (0) job log log
2024/04/02 20:26 2h25m bisect fix linux-6.1.y OK (0) job log log
2024/03/03 11:50 1h22m bisect fix linux-6.1.y OK (0) job log log
2024/01/24 09:48 1h22m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
 exit_mmap+0x3b3/0x980 mm/mmap.c:3250
 __mmput+0x115/0x3c0 kernel/fork.c:1200
 exit_mm+0x226/0x300 kernel/exit.c:565
 do_exit+0x9f6/0x26a0 kernel/exit.c:858
 do_group_exit+0x202/0x2b0 kernel/exit.c:1021
 __do_sys_exit_group kernel/exit.c:1032 [inline]
 __se_sys_exit_group kernel/exit.c:1030 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1030
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
------------[ cut here ]------------
kernel BUG at mm/filemap.c:153!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4248 Comm: syz-executor373 Tainted: G        W          6.1.121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:filemap_unaccount_folio+0x5c2/0xa60 mm/filemap.c:153
Code: 07 38 c1 0f 8c 21 fe ff ff 48 89 ef e8 e7 21 2b 00 e9 14 fe ff ff e8 6d 97 d3 ff 4c 89 ef 48 c7 c6 e0 ff 14 8b e8 7e 50 13 00 <0f> 0b e8 57 97 d3 ff 4c 89 ef 48 c7 c6 60 05 15 8b e8 68 50 13 00
RSP: 0018:ffffc90003b67578 EFLAGS: 00010046
RAX: d8398c7165fba200 RBX: ffff888077258368 RCX: ffffc90003b67303
RDX: 0000000000000002 RSI: ffffffff8b0c14c0 RDI: ffffffff8b5e6400
RBP: ffffc90003b67718 R08: dffffc0000000000 R09: fffffbfff1d3608e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888077258368
R13: ffffea0001c71440 R14: ffffea0001c71440 R15: ffffea0001c71440
FS:  0000555568ec3380(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f564526c0d0 CR3: 0000000079347000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __filemap_remove_folio+0xc7/0xaa0 mm/filemap.c:222
 filemap_remove_folio+0x105/0x2e0 mm/filemap.c:255
 truncate_inode_folio+0x59/0x70 mm/truncate.c:195
 shmem_undo_range+0x570/0x2390 mm/shmem.c:942
 shmem_truncate_range mm/shmem.c:1062 [inline]
 shmem_evict_inode+0x265/0xa60 mm/shmem.c:1171
 evict+0x529/0x930 fs/inode.c:705
 __dentry_kill+0x436/0x650 fs/dcache.c:611
 dentry_kill+0xbb/0x290
 dput+0xfb/0x1d0 fs/dcache.c:918
 __fput+0x62e/0x8d0 fs/file_table.c:328
 task_work_run+0x246/0x300 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f56451f3d70
Code: ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 80 3d 11 93 07 00 00 74 17 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c
RSP: 002b:00007ffc1acc4da8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f56451f3d70
RDX: 0000000000000000 RSI: 0000000000004000 RDI: 0000000000000003
RBP: 00007f564523e0fd R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000202 R12: 00007f564524327c
R13: 00007f564523e082 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:filemap_unaccount_folio+0x5c2/0xa60 mm/filemap.c:153
Code: 07 38 c1 0f 8c 21 fe ff ff 48 89 ef e8 e7 21 2b 00 e9 14 fe ff ff e8 6d 97 d3 ff 4c 89 ef 48 c7 c6 e0 ff 14 8b e8 7e 50 13 00 <0f> 0b e8 57 97 d3 ff 4c 89 ef 48 c7 c6 60 05 15 8b e8 68 50 13 00
RSP: 0018:ffffc90003b67578 EFLAGS: 00010046
RAX: d8398c7165fba200 RBX: ffff888077258368 RCX: ffffc90003b67303
RDX: 0000000000000002 RSI: ffffffff8b0c14c0 RDI: ffffffff8b5e6400
RBP: ffffc90003b67718 R08: dffffc0000000000 R09: fffffbfff1d3608e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888077258368
R13: ffffea0001c71440 R14: ffffea0001c71440 R15: ffffea0001c71440
FS:  0000555568ec3380(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f564526c0d0 CR3: 0000000079347000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (980):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/12/23 17:04 linux-6.1.y 29f02ec58a94 b4fbdbd4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2024/05/01 22:07 linux-6.1.y dcbc050cb0d3 3ba885bc .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/04/09 21:36 linux-6.1.y 3dfebb87d7eb 47d015b1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/04/07 03:18 linux-6.1.y 8e60a714ba3b 1c65791e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/03/04 11:32 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/03/03 19:35 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2024/11/11 22:41 linux-6.1.y d7039b844a1c 0c4b1325 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2024/05/01 19:55 linux-6.1.y dcbc050cb0d3 3ba885bc .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2023/12/25 06:39 linux-6.1.y 4aa6747d9352 fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2023/12/13 08:56 linux-6.1.y e7cddbb41b63 ebcad15c .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/07 10:30 linux-6.1.y 04d1ccaa9c28 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/07/03 19:39 linux-6.1.y 7e69c33e4858 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/07/03 13:50 linux-6.1.y 7e69c33e4858 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/07/03 13:50 linux-6.1.y 7e69c33e4858 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/07/01 05:25 linux-6.1.y 7e69c33e4858 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/29 19:36 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/29 12:05 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/28 13:14 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/28 13:14 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/28 09:21 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/25 19:35 linux-6.1.y 58485ff1a74f 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/23 16:17 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/23 04:05 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/22 11:41 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/22 09:34 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/22 03:45 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/21 20:20 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/21 00:00 linux-6.1.y 58485ff1a74f 804b3919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/20 21:00 linux-6.1.y 58485ff1a74f 804b3919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/06/20 01:44 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in filemap_unaccount_folio
2025/07/13 22:04 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/12 09:09 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/12 02:52 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/04 22:32 linux-6.1.y 7e69c33e4858 d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/03 20:40 linux-6.1.y 7e69c33e4858 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/03 15:04 linux-6.1.y 7e69c33e4858 115ceea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/03 01:39 linux-6.1.y 7e69c33e4858 bc80e4f0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/07/01 02:18 linux-6.1.y 7e69c33e4858 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/30 16:13 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/30 04:05 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/29 18:21 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/29 09:13 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/29 07:22 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/28 03:42 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/27 20:44 linux-6.1.y 7e69c33e4858 803ce19b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/25 22:46 linux-6.1.y 58485ff1a74f 26d77996 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/24 06:28 linux-6.1.y 58485ff1a74f e2f27c35 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/23 16:12 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/23 14:25 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/23 06:03 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/22 22:58 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/22 10:40 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/22 07:07 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/21 18:36 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/21 13:50 linux-6.1.y 58485ff1a74f d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/21 01:30 linux-6.1.y 58485ff1a74f 804b3919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/20 11:32 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/20 08:13 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/20 02:23 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/19 22:11 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
2025/06/19 17:25 linux-6.1.y 58485ff1a74f ed3e87f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in filemap_unaccount_folio
* Struck through repros no longer work on HEAD.