syzbot

 sign-in | mailing list | source | docs
🐞 Open [712]
🐞 Fixed [297]
🐞 Invalid [838]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

WARNING in __brelse

Status: upstream: reported C repro on 2022/10/01 01:04
Subsystems: vfs reiserfs ext4 udf
[Documentation on labels]
Reported-by: syzbot+9fe23c7ceaed0aea4b6b@syzkaller.appspotmail.com
First crash: 957d, last: 801d
▶ ▼ Similar bugs (10)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __brelse (3) fs C done done 1118 62d 658d 0/28 upstream: reported C repro on 2023/07/26 14:30
android-49 WARNING in __brelse C 6 2233d 2223d 0/3 public: reported C repro on 2019/04/14 00:00
upstream WARNING in __brelse udf C inconclusive 22 817d 959d 22/28 fixed on 2023/02/24 13:50
linux-4.14 WARNING in __brelse vfs udf C 6 820d 926d 0/1 upstream: reported C repro on 2022/10/31 19:01
linux-6.1 WARNING in __brelse 8 380d 437d 0/3 auto-obsoleted due to no activity on 2024/08/08 10:26
linux-5.15 WARNING in __brelse (2) 10 64d 286d 0/3 upstream: reported on 2024/08/02 08:59
linux-6.1 WARNING in __brelse (2) 4 121d 173d 0/3 auto-obsoleted due to no activity on 2025/04/23 19:37
android-414 WARNING in __brelse C 10 2233d 2225d 0/1 public: reported C repro on 2019/04/12 00:00
upstream WARNING in __brelse (2) udf 1 809d 805d 0/28 auto-obsoleted due to no activity on 2023/06/25 16:51
linux-5.15 WARNING in __brelse 1 760d 760d 0/3 auto-obsoleted due to no activity on 2023/08/14 05:07

Sample crash report:
------------[ cut here ]------------
VFS: brelse: Trying to free free buffer
WARNING: CPU: 0 PID: 54 at fs/buffer.c:1144 __brelse fs/buffer.c:1144 [inline]
WARNING: CPU: 0 PID: 54 at fs/buffer.c:1144 __brelse+0x67/0xa0 fs/buffer.c:1138
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 54 Comm: kworker/u4:2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x5a kernel/panic.c:541
 report_bug+0x262/0x2b0 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__brelse fs/buffer.c:1144 [inline]
RIP: 0010:__brelse+0x67/0xa0 fs/buffer.c:1138
Code: 7c 04 84 d2 75 4e 44 8b 63 60 31 ff 44 89 e6 e8 bf 16 b2 ff 45 85 e4 75 1c e8 45 15 b2 ff 48 c7 c7 e0 1c 75 88 e8 1e 4d 42 06 <0f> 0b 5b 5d 41 5c e9 2e 15 b2 ff e8 29 15 b2 ff be 04 00 00 00 48
RSP: 0018:ffff8880b51676c0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880b5426a80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1016a2ceca
RBP: ffff8880b5426ae0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880ba028860 R14: ffff8880ae32ac78 R15: ffff8880ba0287e0
 brelse include/linux/buffer_head.h:297 [inline]
 bh_lru_install fs/buffer.c:1247 [inline]
 __find_get_block+0xa28/0xde0 fs/buffer.c:1297
 __getblk_gfp+0x28/0x70 fs/buffer.c:1317
 sb_getblk include/linux/buffer_head.h:333 [inline]
 __ext4_get_inode_loc+0x351/0x10f0 fs/ext4/inode.c:4621
 ext4_write_inode+0x2ec/0x4d0 fs/ext4/inode.c:5466
 write_inode fs/fs-writeback.c:1244 [inline]
 __writeback_single_inode+0x733/0x11d0 fs/fs-writeback.c:1442
 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1716
 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1822
 wb_check_old_data_flush fs/fs-writeback.c:1924 [inline]
 wb_do_writeback fs/fs-writeback.c:1977 [inline]
 wb_workfn+0x8ba/0x1250 fs/fs-writeback.c:2006
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (43):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/20 23:01 linux-4.19.y 3f8a27f9e27b 2414209c .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 WARNING in __brelse
2023/01/16 08:54 linux-4.19.y 3f8a27f9e27b a63719e7 .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 WARNING in __brelse
2022/11/07 01:25 linux-4.19.y 3f8a27f9e27b 6d752409 .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 WARNING in __brelse
2022/10/30 14:30 linux-4.19.y 3f8a27f9e27b 2a71366b .config console log report syz C [disk image] [vmlinux] [mounted in repro] ci2-linux-4-19 WARNING in __brelse
2022/10/03 10:21 linux-4.19.y 3f8a27f9e27b feb56351 .config console log report syz C [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/10/01 01:04 linux-4.19.y 3f8a27f9e27b feb56351 .config console log report syz C [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/03/06 02:52 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/03/04 09:25 linux-4.19.y 3f8a27f9e27b f8902b57 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/02/28 02:04 linux-4.19.y 3f8a27f9e27b 95aee97a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/02/25 10:30 linux-4.19.y 3f8a27f9e27b ee50e71c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/02/19 12:55 linux-4.19.y 3f8a27f9e27b bcdf85f8 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/02/17 09:47 linux-4.19.y 3f8a27f9e27b 851bc19a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/02/10 10:21 linux-4.19.y 3f8a27f9e27b 07980f9d .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/02/05 03:07 linux-4.19.y 3f8a27f9e27b be607b78 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/26 17:06 linux-4.19.y 3f8a27f9e27b 9dfcf09c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/24 07:42 linux-4.19.y 3f8a27f9e27b 9dfcf09c .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/23 06:23 linux-4.19.y 3f8a27f9e27b cc0f9968 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/18 10:31 linux-4.19.y 3f8a27f9e27b 42660d9e .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/16 23:23 linux-4.19.y 3f8a27f9e27b a63719e7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/16 08:06 linux-4.19.y 3f8a27f9e27b a63719e7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/13 13:13 linux-4.19.y 3f8a27f9e27b 96166539 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/12 16:59 linux-4.19.y 3f8a27f9e27b 96166539 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/12 09:43 linux-4.19.y 3f8a27f9e27b 96166539 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/07 17:54 linux-4.19.y 3f8a27f9e27b 1dac8c7a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/07 15:10 linux-4.19.y 3f8a27f9e27b 1dac8c7a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/05 12:16 linux-4.19.y 3f8a27f9e27b 1dac8c7a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/04 06:02 linux-4.19.y 3f8a27f9e27b f0036e18 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/02 14:43 linux-4.19.y 3f8a27f9e27b ab32d508 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2023/01/02 05:08 linux-4.19.y 3f8a27f9e27b ab32d508 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/29 19:30 linux-4.19.y 3f8a27f9e27b 44712fbc .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/28 10:04 linux-4.19.y 3f8a27f9e27b 44712fbc .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/26 12:51 linux-4.19.y 3f8a27f9e27b 9da18ae8 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/24 07:42 linux-4.19.y 3f8a27f9e27b 9da18ae8 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/18 18:54 linux-4.19.y 3f8a27f9e27b 05494336 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/16 20:53 linux-4.19.y 3f8a27f9e27b 05494336 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/13 14:07 linux-4.19.y 3f8a27f9e27b 67be1ae7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/12 10:54 linux-4.19.y 3f8a27f9e27b 67be1ae7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/12 07:42 linux-4.19.y 3f8a27f9e27b 67be1ae7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/12 01:44 linux-4.19.y 3f8a27f9e27b 67be1ae7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/12 01:43 linux-4.19.y 3f8a27f9e27b 67be1ae7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/12/10 01:24 linux-4.19.y 3f8a27f9e27b 67be1ae7 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/11/28 23:25 linux-4.19.y 3f8a27f9e27b 247de55b .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
2022/11/08 21:20 linux-4.19.y 3f8a27f9e27b 060f945e .config console log report info [disk image] [vmlinux] ci2-linux-4-19 WARNING in __brelse
* Struck through repros no longer work on HEAD.