syzbot


KCSAN: data-race in delete_from_page_cache_batch / folio_mapping (2)

Status: moderation: reported on 2023/12/07 10:15
Subsystems: block
[Documentation on labels]
Reported-by: syzbot+1da3e64037786c0f857e@syzkaller.appspotmail.com
First crash: 961d, last: 2d05h
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in delete_from_page_cache_batch / folio_mapping ext4 75 1176d 1230d 0/28 auto-closed as invalid on 2022/04/26 14:38

Sample crash report:
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
==================================================================
BUG: KCSAN: data-race in delete_from_page_cache_batch / folio_mapping

write to 0xffffea000464f4d8 of 8 bytes by task 3765 on cpu 1:
 page_cache_delete_batch mm/filemap.c:306 [inline]
 delete_from_page_cache_batch+0x2f6/0x6f0 mm/filemap.c:332
 truncate_inode_pages_range+0x1b8/0x690 mm/truncate.c:380
 truncate_inode_pages+0x24/0x30 mm/truncate.c:460
 kill_bdev block/bdev.c:91 [inline]
 set_blocksize+0x259/0x310 block/bdev.c:207
 sb_set_blocksize+0x7a/0x100 block/bdev.c:224
 ext4_load_super fs/ext4/super.c:5110 [inline]
 __ext4_fill_super fs/ext4/super.c:5262 [inline]
 ext4_fill_super+0x12ab/0x34e0 fs/ext4/super.c:5724
 get_tree_bdev_flags+0x291/0x300 fs/super.c:1679
 get_tree_bdev+0x1f/0x30 fs/super.c:1702
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5756
 vfs_get_tree+0x54/0x1d0 fs/super.c:1802
 do_new_mount+0x207/0x680 fs/namespace.c:3885
 path_mount+0x4a4/0xb20 fs/namespace.c:4209
 do_mount fs/namespace.c:4222 [inline]
 __do_sys_mount fs/namespace.c:4433 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4410
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4410
 x64_sys_call+0xd36/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea000464f4d8 of 8 bytes by task 3314 on cpu 0:
 folio_mapping+0xa1/0x120 mm/util.c:701
 folio_evictable mm/internal.h:478 [inline]
 lru_add+0x80/0x430 mm/swap.c:136
 folio_batch_move_lru+0x177/0x230 mm/swap.c:168
 lru_add_drain_cpu+0x77/0x250 mm/swap.c:642
 lru_add_drain mm/swap.c:730 [inline]
 __folio_batch_release+0x44/0xb0 mm/swap.c:1049
 folio_batch_release include/linux/pagevec.h:101 [inline]
 truncate_inode_pages_range+0x22a/0x690 mm/truncate.c:383
 truncate_inode_pages mm/truncate.c:460 [inline]
 truncate_inode_pages_final+0x55/0x60 mm/truncate.c:495
 ext4_evict_inode+0xb2/0xd80 fs/ext4/inode.c:185
 evict+0x2e3/0x550 fs/inode.c:810
 iput_final fs/inode.c:1898 [inline]
 iput+0x447/0x5b0 fs/inode.c:1924
 ext4_mb_release+0x539/0x720 fs/ext4/mballoc.c:3817
 ext4_put_super+0x25c/0x7d0 fs/ext4/super.c:1307
 generic_shutdown_super+0xe3/0x210 fs/super.c:643
 kill_block_super+0x2a/0x70 fs/super.c:1753
 ext4_kill_sb+0x42/0x80 fs/ext4/super.c:7391
 deactivate_locked_super+0x75/0x1c0 fs/super.c:474
 deactivate_super+0x97/0xa0 fs/super.c:507
 cleanup_mnt+0x269/0x2e0 fs/namespace.c:1417
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1424
 task_work_run+0x12e/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xe4/0x100 kernel/entry/common.c:114
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888100631e18 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3314 Comm: syz-executor Not tainted 6.15.0-syzkaller-13804-g939f15e640f1 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
==================================================================

Crashes (138):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/09 04:48 upstream 939f15e640f1 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/06/06 18:27 upstream e271ed52b344 9fa58bba .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/06/05 17:37 upstream ec7714e49479 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/06/05 04:23 upstream 1af80d00e1e0 6b6b5f21 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/06/03 18:22 upstream 546b1c9e93c2 a30356b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/05/22 21:13 upstream 5cdb2c77c4c3 0919b50b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/05/10 22:06 upstream bec6f00f120e 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/05/03 00:46 upstream 2bfcee565c3a b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/04/26 19:56 upstream f1a3944c860b c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/04/21 00:47 upstream 6fea5fabd332 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/04/13 02:13 upstream 7cdabafc0012 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/04/05 21:05 upstream a8662bcd2ff1 1c65791e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/03/26 13:49 upstream 2df0c02dab82 89d30d73 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/03/20 09:03 upstream a7f2e10ecd8f 9209bc22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/03/19 15:31 upstream 81e4f8d68c66 e20d7b13 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/03/10 22:16 upstream 4d872d51bc9d 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/24 21:11 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/20 18:29 upstream e9a8cac0bf89 50668798 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/19 02:45 upstream 6537cfb395f3 9a14138f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/17 00:31 upstream 224e74511041 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/12 11:05 upstream 09fbf3d50205 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/07 16:46 upstream bb066fe812d6 53657d1b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/03 17:40 upstream 2014c95afece a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/02 13:54 upstream a86bf2283d2c 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/02/01 11:31 upstream 60c828cf80c0 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/01/26 10:42 upstream aa22f4da2a46 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/01/21 11:38 upstream 95ec54a420b8 6e87cfa2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/01/10 21:41 upstream 2144da25584e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2025/01/03 13:08 upstream 0bc21e701a6f d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/12/23 01:12 upstream bcde95ce32b6 b4fbdbd4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/12/19 05:02 upstream eabcdba3ad40 1432fc84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/12/08 12:16 upstream 7503345ac5f5 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/11/30 20:59 upstream 2ba9f676d0a2 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/11/28 03:19 upstream 7d4050728c83 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/10/23 14:51 upstream c2ee9f594da8 15fa2979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/10/22 05:12 upstream d12937763990 a93682b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/10/18 07:24 upstream 6efbea77b390 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/10/13 11:02 upstream 7234e2ea0edd 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/09/24 16:00 upstream abf2050f51fd 5643e0e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/09/09 07:57 upstream da3ea35007d0 9750182a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/09/05 11:13 upstream c763c4339688 464ac2ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/08/12 07:38 upstream 7006fe2f7f78 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/07/26 20:34 upstream 2f8c4f506285 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/07/08 09:49 upstream 256abd8e550c 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/07/01 19:08 upstream 9903efbddba0 b294e901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/06/12 02:52 upstream 2ef5971ff345 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/06/05 07:49 upstream 32f88d65f01b e1e2c66e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/05/19 07:17 upstream 0450d2083be6 c0f1611a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2024/05/11 16:16 upstream cf87f46fd34d 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2023/11/26 19:22 upstream 090472ed9c92 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
2022/10/24 01:06 upstream d47136c28015 23bf86af .config console log report info [disk image] [vmlinux] ci2-upstream-kcsan-gce KCSAN: data-race in delete_from_page_cache_batch / folio_mapping
* Struck through repros no longer work on HEAD.