syzbot


KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range

Status: moderation: reported on 2022/01/06 20:11
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+06d291120ff02d083cb8@syzkaller.appspotmail.com
First crash: 1242d, last: 1d22h

Sample crash report:
loop0: detected capacity change from 0 to 256
==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range

read-write to 0xffff888100630570 of 8 bytes by task 3290 on cpu 1:
 __filemap_add_folio+0x432/0x710 mm/filemap.c:928
 filemap_add_folio+0x9f/0x1b0 mm/filemap.c:980
 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:2590
 filemap_read+0x231/0x8d0 mm/filemap.c:2701
 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 0xffff888100630570 of 8 bytes by task 3613 on cpu 0:
 mapping_needs_writeback mm/filemap.c:643 [inline]
 filemap_write_and_wait_range+0x5c/0x370 mm/filemap.c:692
 filemap_write_and_wait include/linux/pagemap.h:68 [inline]
 sync_blockdev block/bdev.c:222 [inline]
 set_blocksize+0x1d3/0x270 block/bdev.c:172
 sb_set_blocksize+0x7e/0x100 block/bdev.c:186
 fat_fill_super+0x998/0x1c70 fs/fat/inode.c:1629
 vfat_fill_super+0x24/0x30 fs/fat/namei_vfat.c:1197
 get_tree_bdev_flags+0x2b4/0x330 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 vfat_get_tree+0x1c/0x30 fs/fat/namei_vfat.c:1202
 vfs_get_tree+0x56/0x1e0 fs/super.c:1759
 do_new_mount+0x246/0x6b0 fs/namespace.c:3878
 path_mount+0x49b/0xb30 fs/namespace.c:4205
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x28f/0x2e0 fs/namespace.c:4406
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4406
 x64_sys_call+0xd11/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:166
 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

value changed: 0x0000000000000005 -> 0x0000000000000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3613 Comm: syz.0.60 Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================
netlink: 4 bytes leftover after parsing attributes in process `syz.0.60'.
bridge_slave_1: left allmulticast mode
bridge_slave_1: left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_0: left allmulticast mode
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state

Crashes (872):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/26 08:49 upstream 2df0c02dab82 89d30d73 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/24 11:42 upstream 586de92313fc 875573af .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/23 21:45 upstream 586de92313fc 4e8d3850 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/23 04:18 upstream 183601b78a9b 4e8d3850 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/23 00:31 upstream 183601b78a9b c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/21 20:47 upstream d07de43e3f05 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/21 02:10 upstream 5fc319360819 62330552 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/18 09:25 upstream fc444ada1310 ce3352cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/11 04:16 upstream 4d872d51bc9d 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/03/08 03:57 upstream 21e4543a2e2f 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/24 11:38 upstream d082ecbc71e9 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/23 13:33 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/21 17:10 upstream 334426094588 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/20 21:42 upstream e9a8cac0bf89 0808a665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/18 20:02 upstream 6537cfb395f3 c37c7249 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/16 12:27 upstream ad1b832bf1cf 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/15 12:01 upstream 78a632a2086c 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/13 21:17 upstream ab68d7eb7b1a a98a8417 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/12 10:34 upstream 09fbf3d50205 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/11 12:56 upstream febbc555cf0f 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/07 22:50 upstream bb066fe812d6 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/05 14:19 upstream 5c8c229261f1 4dc70884 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/02/03 01:43 upstream d79bc8f79baa 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/29 22:30 upstream ebbb8be421ee 136953f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/29 18:22 upstream 05dbaf8dd8bf 136953f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/26 11:19 upstream aa22f4da2a46 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/25 04:15 upstream b46c89c08f41 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/23 23:48 upstream d0d106a2bd21 521b0ce3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/23 14:50 upstream 21266b8df522 a44b0418 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/22 12:19 upstream c4b9570cfb63 da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/22 00:46 upstream b9d8a295ed6b da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/17 22:10 upstream 9bffa1ad25b8 953d1c45 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/17 09:42 upstream 9bffa1ad25b8 f9e07a6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/16 18:41 upstream ce69b4019001 f9e07a6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/16 01:50 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/12 07:09 upstream b62cef9a5c67 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/10 08:51 upstream 643e2e259c2b 67d7ec0a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/06 22:08 upstream 9d89551994a4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/05 23:15 upstream 9244696b34f2 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/05 02:14 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2025/01/02 02:24 upstream 56e6a3499e14 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2024/12/31 01:27 upstream ccb98ccef0e5 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2024/12/29 00:09 upstream 059dd502b263 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2022/01/06 17:04 upstream 75acfdb6fd92 6acc789a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
2021/11/01 23:42 upstream e66435936756 098b5d53 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range
* Struck through repros no longer work on HEAD.