syzbot


KCSAN: data-race in __find_get_block / has_bh_in_lru

Status: moderation: reported syz repro on 2020/02/03 02:48
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+aa6de90d54fa7c0888ad@syzkaller.appspotmail.com
First crash: 2010d, last: 14h19m

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __find_get_block / has_bh_in_lru

read-write to 0xffff888237d2a448 of 8 bytes by task 3114 on cpu 1:
 bh_lru_install fs/buffer.c:1340 [inline]
 __find_get_block+0x409/0x890 fs/buffer.c:1403
 bdev_getblk+0x35/0x7a0 fs/buffer.c:1423
 __getblk include/linux/buffer_head.h:358 [inline]
 sb_getblk include/linux/buffer_head.h:364 [inline]
 ext4_getblk+0x1c1/0x510 fs/ext4/inode.c:841
 ext4_bread+0x2c/0x110 fs/ext4/inode.c:887
 __ext4_read_dirblock+0x77/0x5a0 fs/ext4/namei.c:144
 htree_dirblock_to_tree+0x102/0x630 fs/ext4/namei.c:1082
 ext4_htree_fill_tree+0x429/0x9b0 fs/ext4/namei.c:1219
 ext4_dx_readdir fs/ext4/dir.c:597 [inline]
 ext4_readdir+0x15b0/0x1ac0 fs/ext4/dir.c:142
 iterate_dir+0x128/0x300 fs/readdir.c:106
 __do_sys_getdents64 fs/readdir.c:405 [inline]
 __se_sys_getdents64+0x88/0x1a0 fs/readdir.c:390
 __x64_sys_getdents64+0x43/0x50 fs/readdir.c:390
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237d2a448 of 8 bytes by task 3102 on cpu 0:
 has_bh_in_lru+0x35/0x1e0 fs/buffer.c:1510
 cpu_needs_drain mm/swap.c:802 [inline]
 __lru_add_drain_all+0x254/0x420 mm/swap.c:889
 lru_add_drain_all+0x10/0x20 mm/swap.c:905
 invalidate_bdev+0x54/0x70 block/bdev.c:86
 ext4_put_super+0x51b/0x7e0 fs/ext4/super.c:1361
 generic_shutdown_super+0xdb/0x210 fs/super.c:696
 kill_block_super+0x2a/0x60 fs/super.c:1667
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7330
 deactivate_locked_super+0x7a/0x1c0 fs/super.c:484
 deactivate_super+0x9b/0xb0 fs/super.c:517
 cleanup_mnt+0x272/0x2e0 fs/namespace.c:1256
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1263
 task_work_run+0x135/0x1a0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd6/0xe0 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000000000 -> 0xffff8881053bbf70

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3102 Comm: syz-executor.0 Not tainted 6.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
==================================================================

Crashes (2496):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/04 09:12 upstream 33cc938e65a9 f819d6f7 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/25 08:48 upstream 02ddfb981de8 e3715315 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/23 09:53 upstream bc3372351d0c 53a8b9bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/20 20:24 upstream 6fea5fabd332 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/19 10:25 upstream 3088d26962e8 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/18 18:33 upstream fc96b232f8e7 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/18 02:42 upstream b5c6891b2c5b 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/17 08:41 upstream cfb2e2c57aef 229db4cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/16 18:11 upstream c62f4b82d571 a95239b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/14 10:55 upstream 8ffd015db85f 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/13 22:52 upstream 5aaaedb0cb54 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/12 13:11 upstream 3bde70a2c827 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/11 15:20 upstream 900241a5cc15 94486846 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/10 20:31 upstream 2eb959eeecc6 1ef3ab4d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/08 14:04 upstream 0af2f6be1b42 a775275d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/06 22:41 upstream 0af2f6be1b42 1c65791e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/05 23:46 upstream a8662bcd2ff1 1c65791e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/05 02:46 upstream a52a3c18cdf3 c53ea9c9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/04 13:34 upstream e48e99b6edf4 1c4febdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/03 15:32 upstream a1b5bd45d4ee 996a9618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/03 04:52 upstream 92b71befc349 c799dfdd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/02 09:22 upstream acc4d5ff0b61 c799dfdd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/04/01 10:08 upstream 1e7857b28020 36d76a97 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/31 20:06 upstream 4e82c87058f4 d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/30 07:01 upstream 7f2ff7b62617 d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/27 18:10 upstream 1a9239bb4253 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/27 02:09 upstream 1e1ba8d23dae 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/25 19:21 upstream 2df0c02dab82 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/25 13:00 upstream 3ba7dfb8da62 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/24 21:44 upstream 38fec10eb60d 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/24 12:04 upstream 586de92313fc 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/23 06:51 upstream 183601b78a9b 4e8d3850 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/22 01:32 upstream d07de43e3f05 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/20 23:39 upstream 5fc319360819 62330552 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/20 02:07 upstream a7f2e10ecd8f e20d7b13 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/19 05:02 upstream 81e4f8d68c66 8d0a2921 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/18 19:19 upstream 76b6905c11fd 22a6c2b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/18 13:52 upstream fc444ada1310 ce3352cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/18 01:51 upstream 4701f33a1070 ce3352cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/17 10:12 upstream 4701f33a1070 948c34e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/14 05:10 upstream 4003c9e78778 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/13 13:15 upstream b7f94fcf5546 44be8b44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/13 02:48 upstream 0fed89a961ea 1a5d9317 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/11 21:38 upstream 0b46b049d6ec 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/09 16:02 upstream 1110ce6a1e34 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/09 03:15 upstream b7c90e3e717a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/08 05:22 upstream 21e4543a2e2f 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2025/03/07 02:43 upstream 0f52fd4f67c6 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __find_get_block / has_bh_in_lru
2021/01/16 23:40 upstream 54c6247d06f1 65a7a854 .config console log report info ci2-upstream-kcsan-gce
2020/02/02 11:07 https://github.com/google/ktsan.git kcsan 245a43005292 2274ad39 .config console log report ci2-upstream-kcsan-gce
2020/01/30 02:45 https://github.com/google/ktsan.git kcsan 245a43005292 5ed23f9a .config console log report ci2-upstream-kcsan-gce
2019/10/24 14:58 https://github.com/google/ktsan.git kcsan 05f2236801fe d01bb02a .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.