syzbot


KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages (3)

Status: moderation: reported on 2023/12/10 00:02
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+a0bf2421e1edfc040964@syzkaller.appspotmail.com
First crash: 545d, last: 12h46m
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages ext4 45 1126d 1233d 0/28 auto-closed as invalid on 2022/04/01 15:15
upstream KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages (2) ext4 63 581d 1087d 0/28 auto-obsoleted due to no activity on 2023/09/28 20:31

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881004c1e70 of 8 bytes by task 3293 on cpu 0:
 __filemap_add_folio+0x432/0x710 mm/filemap.c:929
 filemap_add_folio+0x9f/0x1b0 mm/filemap.c:981
 page_cache_ra_unbounded+0x1c1/0x350 mm/readahead.c:275
 do_page_cache_ra mm/readahead.c:327 [inline]
 force_page_cache_ra mm/readahead.c:356 [inline]
 page_cache_sync_ra+0x252/0x680 mm/readahead.c:575
 filemap_get_pages+0x2ba/0x11b0 mm/filemap.c:2602
 filemap_read+0x231/0x8d0 mm/filemap.c:2713
 blkdev_read_iter+0x227/0x2d0 block/fops.c:796
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x5e6/0x710 fs/read_write.c:570
 ksys_read+0xeb/0x1b0 fs/read_write.c:713
 __do_sys_read fs/read_write.c:722 [inline]
 __se_sys_read fs/read_write.c:720 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:720
 x64_sys_call+0x2a3b/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881004c1e70 of 8 bytes by task 36 on cpu 1:
 nr_blockdev_pages+0x7c/0xd0 block/bdev.c:485
 si_meminfo+0x87/0xd0 mm/show_mem.c:80
 update_defense_level+0x4b/0x5c0 net/netfilter/ipvs/ip_vs_ctl.c:102
 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x4de/0xa20 kernel/workqueue.c:3319
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3400
 kthread+0x4ae/0x520 kernel/kthread.c:464
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x000000000000000d -> 0x000000000000000e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 36 Comm: kworker/1:1 Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_long defense_work_handler
==================================================================

Crashes (84):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/27 18:17 upstream 1a9239bb4253 6c09fb82 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/03/27 13:56 upstream 1e1ba8d23dae 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/03/25 15:02 upstream 3ba7dfb8da62 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/03/13 00:29 upstream 0fed89a961ea 1a5d9317 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/03/02 12:22 upstream ece144f151ac c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/03/01 14:48 upstream 7a5668899f54 67cf5345 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/02/19 08:17 upstream 6537cfb395f3 9a14138f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/02/14 19:10 upstream 128c8f96eb86 1022af74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/02/10 07:55 upstream 69b54314c975 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/02/03 21:32 upstream 2014c95afece a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/02/01 12:40 upstream 60c828cf80c0 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/01/20 14:45 upstream ffd294d346d1 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/01/19 00:20 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/01/13 15:03 upstream 5bc55a333a2f 249ceea9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/01/13 02:07 upstream be548645527a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/01/11 11:44 upstream 77a903cd8e5a 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/01/07 03:19 upstream fbfd64d25c7a f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2025/01/03 21:39 upstream 0bc21e701a6f f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/12/22 03:44 upstream 48f506ad0b68 d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/12/17 01:31 upstream f44d154d6e3d eec85da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/12/14 02:35 upstream 243f750a2df0 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/12/09 02:45 upstream 62b5a46999c7 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/11/23 20:09 upstream 42d9e8b7ccdd 68da6d95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/11/15 15:07 upstream cfaaa7d010d1 f6ede3a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/10/26 01:23 upstream 850925a8133c 65e8686b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/10/24 09:15 upstream c2ee9f594da8 15fa2979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/10/22 08:58 upstream d12937763990 a93682b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/10/14 09:55 upstream 6485cf5ea253 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/09/28 14:31 upstream ad46e8f95e93 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/09/17 23:08 upstream 2f27fce67173 c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/09/16 22:19 upstream adfc3ded5c33 c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/09/13 12:01 upstream fdf042df0463 73e8a465 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/09/06 14:53 upstream b831f83e40a2 464ac2ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/08/31 08:46 upstream 1934261d8974 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/08/17 18:29 upstream e5fa841af679 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/08/17 02:00 upstream 85652baa895b dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/27 03:01 upstream 2f8c4f506285 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/22 03:01 upstream 7846b618e0a4 b88348e9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/19 19:27 upstream 4305ca0087dd 890ce4f3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/18 23:46 upstream b1bc554e009e 71884c12 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/15 18:10 upstream 5e0497553643 c605e6a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/11 10:02 upstream 9d9a2f29aefd c699c2eb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/06 02:51 upstream d270dd21bee0 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/07/02 13:26 upstream 1dfe225e9af5 07f0a0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/06/23 02:34 upstream 563a50672d8a edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/03/03 13:38 upstream 04b8076df253 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/02/27 16:06 upstream 45ec2f5f6ed3 05e69c83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/02/22 04:12 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/02/13 08:08 upstream c664e16bb1ba 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/02/12 14:06 upstream 841c35169323 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/02/09 01:18 upstream 047371968ffc 7f07e9b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/01/09 18:21 upstream 9f8413c4a66f 4807fb37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2024/01/05 02:50 upstream 5eff55d725a4 28c42cff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/12/21 12:24 upstream a4aebe936554 4f9530a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/12/12 02:55 upstream 26aff849438c 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/11/24 18:38 upstream f1a09972a45a 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/11/17 08:12 upstream 7475e51b8796 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/11/15 13:09 upstream c42d9eeef8e5 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/11/01 17:19 upstream 8bc9e6515183 69904c9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/10/20 20:28 upstream c8045b4a33a5 361b23dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/10/14 05:26 upstream 8cb1f10d8c4b f757a323 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/10/02 01:28 upstream e81a2dabc3f3 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/10/01 12:24 upstream e402b08634b3 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
2023/09/30 06:43 upstream 9f3ebbef746f 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages
* Struck through repros no longer work on HEAD.