syzbot

 sign-in | mailing list | source | docs
🐞 Open [698]
🐞 Fixed [97]
🐞 Invalid [561]
⬇ Missing Backports [40]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

BUG: unable to handle kernel paging request in prepare_for_delete_or_cut

Status: upstream: reported C repro on 2024/03/02 01:50
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+ac366b1d501fa8852acc@syzkaller.appspotmail.com
First crash: 294d, last: 6d12h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2024/12/15 linux-6.1.y (ToT) 52f863f820fd C [report] BUG: unable to handle kernel paging request in prepare_for_delete_or_cut
2024/03/02 upstream (ToT) 5ad3cb0ed525 C [report] BUG: unable to handle kernel paging request in prepare_for_delete_or_cut
2024/12/15 upstream (ToT) 2d8308bf5b67 C Didn't crash
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in prepare_for_delete_or_cut reiserfs C error done 71 330d 714d 0/28 auto-obsoleted due to no activity on 2024/05/03 14:06
linux-5.15 BUG: unable to handle kernel paging request in prepare_for_delete_or_cut origin:upstream missing-backport C error 5 3d08h 245d 0/3 upstream: reported C repro on 2024/04/20 01:57
linux-4.19 general protection fault in prepare_for_delete_or_cut fat reiserfs C error 3 690d 719d 0/1 upstream: reported C repro on 2023/01/01 21:41
linux-4.14 general protection fault in prepare_for_delete_or_cut reiserfs fat C 2 675d 722d 0/1 upstream: reported C repro on 2022/12/30 06:10
▶ ▼ Fix bisection attempts (7)
Created Duration User Patch Repo Result
2024/12/09 18:05 45m bisect fix linux-6.1.y error job log
2024/10/26 07:27 2h01m bisect fix linux-6.1.y OK (0) job log log
2024/09/25 15:48 1h46m bisect fix linux-6.1.y OK (0) job log log
2024/08/19 09:30 3h24m bisect fix linux-6.1.y OK (0) job log log
2024/07/08 00:52 1h34m bisect fix linux-6.1.y OK (0) job log log
2024/05/29 22:12 1h22m bisect fix linux-6.1.y OK (0) job log log
2024/04/24 18:32 2h00m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 4029, free_space(entry_count) 2
REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 533. Fsck?
Unable to handle kernel paging request at virtual address dfff800000000005
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000005] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4222 Comm: syz-executor167 Not tainted 6.1.80-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
pc : item_head fs/reiserfs/reiserfs.h:2200 [inline]
pc : tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
pc : prepare_for_delete_or_cut+0x130/0x1a34 fs/reiserfs/stree.c:1050
lr : tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
lr : prepare_for_delete_or_cut+0xf0/0x1a34 fs/reiserfs/stree.c:1050
sp : ffff80001dc66da0
x29: ffff80001dc66ee0 x28: 1ffff00003b8ceb4 x27: ffff700003b8cdcc
x26: ffff80001dc675a8 x25: ffff80001dc675a0 x24: dfff800000000000
x23: dfff800000000000 x22: ffff80001dc67640 x21: 0000000000000000
x20: 0000000000000028 x19: ffff80001dc675c0 x18: ffff80001dc66160
x17: 6f662064696c6176 x16: ffff8000120942c0 x15: 0000000000000000
x14: 00000000fffffffe x13: ffff0000da2eb780 x12: ffff80001dc66e60
x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff800008d9ffc0
x8 : 0000000000000005 x7 : 0000000000000001 x6 : 0000000000000000
x5 : ffff80001dc67410 x4 : ffff80001dc67420 x3 : ffff80001dc67640
x2 : ffff80001dc675a0 x1 : 0000000000000001 x0 : 0000000000000008
Call trace:
 reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
 item_head fs/reiserfs/reiserfs.h:2200 [inline]
 tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
 prepare_for_delete_or_cut+0x130/0x1a34 fs/reiserfs/stree.c:1050
 reiserfs_cut_from_item+0x2ac/0x1c98 fs/reiserfs/stree.c:1682
 reiserfs_do_truncate+0x89c/0x11c8 fs/reiserfs/stree.c:1973
 reiserfs_truncate_file+0x510/0xb1c fs/reiserfs/inode.c:2310
 reiserfs_file_release+0x710/0x884 fs/reiserfs/file.c:109
 __fput+0x30c/0x7bc fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x240/0x2f0 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2148/0x3474 arch/arm64/kernel/signal.c:1132
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 35008b48 9100a294 b9800275 d343fe88 (38786908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	35008b48 	cbnz	w8, 0x1168
   4:	9100a294 	add	x20, x20, #0x28
   8:	b9800275 	ldrsw	x21, [x19]
   c:	d343fe88 	lsr	x8, x20, #3
* 10:	38786908 	ldrb	w8, [x8, x24] <-- trapping instruction

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/02 01:49 linux-6.1.y a3eb3a74aa8c 83acf9e0 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_for_delete_or_cut
2024/03/25 08:44 linux-6.1.y d7543167affd 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: unable to handle kernel paging request in prepare_for_delete_or_cut
* Struck through repros no longer work on HEAD.