syzbot


KASAN: null-ptr-deref Read in drop_buffers (3)

Status: upstream: reported C repro on 2024/10/02 03:03
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+de1498ff3a934ac5e8b4@syzkaller.appspotmail.com
First crash: 220d, last: 24d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] KASAN: null-ptr-deref Read in drop_buffers (3) 1 (3) 2024/10/17 14:11
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: null-ptr-deref Read in drop_buffers (2) jfs C error 252 352d 563d 0/28 auto-obsoleted due to no activity on 2024/05/08 22:28
upstream KASAN: null-ptr-deref Read in drop_buffers kernfs 5 839d 839d 0/28 auto-obsoleted due to no activity on 2023/02/27 02:04
linux-6.1 KASAN: slab-out-of-bounds Read in drop_buffers 1 14d 14d 0/3 upstream: reported on 2025/01/31 23:03
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/10/23 18:22 19m retest repro upstream OK log
2024/10/17 14:11 21m sarvesh20123@gmail.com patch upstream OK log

Sample crash report:
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: null-ptr-deref in buffer_busy fs/buffer.c:2876 [inline]
BUG: KASAN: null-ptr-deref in drop_buffers+0x64/0x4c0 fs/buffer.c:2888
Read of size 4 at addr 0000000000000060 by task kswapd0/89

CPU: 1 UID: 0 PID: 89 Comm: kswapd0 Not tainted 6.13.0-syzkaller-02526-gc4b9570cfb63 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_report+0xe8/0x550 mm/kasan/report.c:492
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 buffer_busy fs/buffer.c:2876 [inline]
 drop_buffers+0x64/0x4c0 fs/buffer.c:2888
 try_to_free_buffers+0x278/0x3b0 fs/buffer.c:2942
 shrink_folio_list+0x210c/0x57e0 mm/vmscan.c:1440
 shrink_inactive_list mm/vmscan.c:1967 [inline]
 shrink_list mm/vmscan.c:2205 [inline]
 shrink_lruvec+0x16db/0x2f30 mm/vmscan.c:5737
 shrink_node_memcgs mm/vmscan.c:5939 [inline]
 shrink_node+0x12a4/0x2e10 mm/vmscan.c:5980
 kswapd_shrink_node mm/vmscan.c:6795 [inline]
 balance_pgdat mm/vmscan.c:6987 [inline]
 kswapd+0x1958/0x2e30 mm/vmscan.c:7252
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
==================================================================

Crashes (96):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/22 16:31 upstream c4b9570cfb63 a44b0418 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: null-ptr-deref Read in drop_buffers
2025/01/19 20:06 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2025/01/14 19:57 upstream c3812b15000c 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2025/01/14 14:48 upstream c45323b7560e 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2025/01/11 07:35 upstream 77a903cd8e5a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2025/01/09 18:53 upstream eea6e4b4dfb8 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: null-ptr-deref Read in drop_buffers
2025/01/09 12:13 upstream eea6e4b4dfb8 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2025/01/08 03:27 upstream 09a0fa92e5b4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2025/01/06 14:50 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/30 10:23 upstream fc033cf25e61 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/28 15:37 upstream fd0584d220fe d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/27 21:02 upstream 8379578b11d5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/26 13:40 upstream 9b2ffa6148b1 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/26 10:25 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/24 18:52 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/22 20:22 upstream bcde95ce32b6 b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/22 10:25 upstream 48f506ad0b68 d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/19 14:15 upstream eabcdba3ad40 1d58202c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/16 15:32 upstream 78d4f34e2115 f93b2b55 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/13 19:01 upstream f932fb9b4074 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/09 11:44 upstream fac04efc5c79 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/05 23:02 upstream 5076001689e4 6e50d07b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/12/03 07:08 upstream cdd30ebb1b9f 578925bc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/11/29 17:23 upstream 7af08b57bcb9 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/11/29 06:23 upstream 7af08b57bcb9 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: null-ptr-deref Read in drop_buffers
2024/11/27 18:13 upstream aaf20f870da0 52b38cc1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: null-ptr-deref Read in drop_buffers
2024/11/27 07:21 upstream 7eef7e306d3c 52b38cc1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/11/21 21:54 upstream 43fb83c17ba2 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: null-ptr-deref Read in drop_buffers
2024/11/21 09:10 upstream 43fb83c17ba2 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/04 15:54 upstream 0c559323bbaa d7906eff .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/04 05:09 upstream 3840cbe24cf0 d7906eff .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/04 03:55 upstream 3840cbe24cf0 d7906eff .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/03 16:00 upstream 7ec462100ef9 d7906eff .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/02 04:09 upstream e32cde8d2bd7 ea2b66a6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/02 03:03 upstream e32cde8d2bd7 ea2b66a6 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/02 01:33 upstream e32cde8d2bd7 ea2b66a6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/09/01 06:52 upstream 6cd90e5ea72f 1eda0d14 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/08/18 04:16 upstream df6cbc62cc9b e1c76ab2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: null-ptr-deref Read in drop_buffers
2024/11/18 12:21 linux-next ae58226b89ac 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/30 11:48 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/09 18:22 linux-next 33ce24234fca 0278d004 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/08 08:12 linux-next 33ce24234fca 402f1df0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/10/08 07:59 linux-next 33ce24234fca 402f1df0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/16 08:13 linux-next 3fe121b62282 b66b37bd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 16:35 linux-next 3fe121b62282 efee4ed2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 12:48 linux-next 3fe121b62282 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 12:43 linux-next 3fe121b62282 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 06:39 linux-next 3fe121b62282 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 06:17 linux-next 3fe121b62282 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 05:51 linux-next 3fe121b62282 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 05:50 linux-next 3fe121b62282 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 03:18 linux-next 3fe121b62282 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/12 17:36 linux-next 3fe121b62282 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/09 22:22 linux-next 82d01fe6ee52 79d68ada .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: null-ptr-deref Read in drop_buffers
2024/07/15 18:28 linux-next 3fe121b62282 efee4ed2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: user-memory-access Read in drop_buffers
* Struck through repros no longer work on HEAD.