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: 1607d, last: 1d14h

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 (2099):
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
2024/03/17 16:39 upstream 741e9d668aa5 d615901c .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
2024/03/16 21:38 upstream 66a27abac311 d615901c .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
2024/03/15 14:57 upstream e5eb28f6d1af d615901c .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
2024/03/14 02:35 upstream 61387b8dcf1d f919f202 .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
2024/03/13 03:40 upstream 1f440397665f c35c26ec .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
2024/03/12 12:10 upstream 855684c7d938 c35c26ec .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
2024/03/12 00:41 upstream 045395d86acd 6ee49f2e .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
2024/03/11 14:48 upstream e8f897f4afef 6ee49f2e .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
2024/03/11 03:26 upstream fa4b851b4ad6 6ee49f2e .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
2024/03/10 14:07 upstream 005f6f34bd47 6ee49f2e .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
2024/03/09 23:18 upstream 09e5c48fea17 6ee49f2e .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
2024/03/09 08:04 upstream 10d48d70e82d 6ee49f2e .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
2024/03/08 19:41 upstream 3aaa8ce7a335 8e75c913 .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
2024/03/08 04:34 upstream 3aaa8ce7a335 cf82cde1 .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
2024/03/07 21:11 upstream 135288b73cef 2b789849 .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
2024/03/07 14:49 upstream 67be068d31d4 2b789849 .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
2024/03/07 03:25 upstream 67be068d31d4 f39a7eed .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
2024/03/06 17:33 upstream 5847c9777c30 f39a7eed .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
2024/03/05 22:43 upstream 29cd507cbec2 f39a7eed .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
2024/03/05 20:43 upstream 90d35da658da f39a7eed .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
2024/03/05 03:00 upstream 90d35da658da 5fc53669 .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
2024/03/04 14:42 upstream 90d35da658da 3717835d .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
2024/03/04 00:24 upstream 58c806d867bf 25905f5d .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
2024/03/03 09:05 upstream 04b8076df253 25905f5d .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
2024/03/03 03:27 upstream 5ad3cb0ed525 25905f5d .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
2024/03/02 03:08 upstream 17ba56605bfd 25905f5d .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
2024/03/01 22:23 upstream 17ba56605bfd 83acf9e0 .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
2024/03/01 19:51 upstream 87adedeba51a 83acf9e0 .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
2024/03/01 05:31 upstream 87adedeba51a 352ab904 .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
2024/02/29 16:38 upstream 805d849d7c3c 352ab904 .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
2024/02/29 02:28 upstream e326df53af00 352ab904 .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
2024/02/28 20:50 upstream e326df53af00 55d6f11d .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
2024/02/28 16:35 upstream cf1182944c7c 55d6f11d .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
2024/02/28 02:25 upstream cf1182944c7c d367cbe5 .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
2024/02/27 09:40 upstream 45ec2f5f6ed3 05e69c83 .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
2024/02/26 15:38 upstream d206a76d7d27 da36a36b .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
2024/02/26 00:13 upstream 70ff1fe626a1 8d446f15 .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
2024/02/25 15:06 upstream ab0a97cffa0b 8d446f15 .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
2024/02/24 19:26 upstream f2e367d6ad3b 8d446f15 .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
2024/02/23 23:39 upstream 603c04e27c3e 8d446f15 .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
2024/02/23 20:17 upstream ffd2cb6b718e 8d446f15 .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
2024/02/23 00:13 upstream 1c892cdd8fe0 8d446f15 .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
2024/02/22 13:18 upstream 39133352cbed 345111b5 .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
2024/02/21 12:53 upstream 9fc1ccccfd8d 3af7dd65 .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
2024/02/21 00:49 upstream fca7526b7d89 3af7dd65 .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
2024/02/19 16:23 upstream b401b621758e 3af7dd65 .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
2024/02/18 23:28 upstream b401b621758e 578f7538 .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
2024/02/18 09:29 upstream c02197fc9076 578f7538 .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
2024/02/18 00:35 upstream ced590523156 578f7538 .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
2024/02/17 15:14 upstream c1ca10ceffbb 578f7538 .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.