syzbot


KCSAN: data-race in shmem_getattr / shmem_recalc_inode

Status: moderation: reported on 2024/07/04 23:41
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+dfb578404df369f6599b@syzkaller.appspotmail.com
First crash: 225d, last: 3d10h

Sample crash report:
==================================================================
BUG: KCSAN: data-race in shmem_getattr / shmem_recalc_inode

read-write to 0xffff888101f5fa30 of 8 bytes by task 4319 on cpu 1:
 shmem_recalc_inode+0x36/0x1b0 mm/shmem.c:443
 shmem_alloc_and_add_folio mm/shmem.c:1960 [inline]
 shmem_get_folio_gfp+0x7ce/0xd90 mm/shmem.c:2522
 shmem_get_folio mm/shmem.c:2628 [inline]
 shmem_write_begin+0xa2/0x180 mm/shmem.c:3278
 generic_perform_write+0x1a8/0x4a0 mm/filemap.c:4189
 shmem_file_write_iter+0xc2/0xe0 mm/shmem.c:3454
 __kernel_write_iter+0x247/0x4c0 fs/read_write.c:612
 dump_emit_page fs/coredump.c:884 [inline]
 dump_user_range+0x3ac/0x550 fs/coredump.c:945
 elf_core_dump+0x1bf4/0x1cf0 fs/binfmt_elf.c:2129
 do_coredump+0x171e/0x1c90 fs/coredump.c:758
 get_signal+0xd4f/0x1000 kernel/signal.c:3021
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 irqentry_exit_to_user_mode+0xa7/0x120 kernel/entry/common.c:231
 irqentry_exit+0x12/0x50 kernel/entry/common.c:334
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

read to 0xffff888101f5fa30 of 8 bytes by task 3301 on cpu 0:
 shmem_getattr+0x42/0x200 mm/shmem.c:1237
 vfs_getattr_nosec fs/stat.c:208 [inline]
 vfs_getattr fs/stat.c:246 [inline]
 vfs_statx_path+0x178/0x2f0 fs/stat.c:283
 vfs_statx+0xe1/0x170 fs/stat.c:349
 vfs_fstatat fs/stat.c:368 [inline]
 __do_sys_newfstatat fs/stat.c:532 [inline]
 __se_sys_newfstatat+0xdc/0x300 fs/stat.c:526
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:526
 x64_sys_call+0x236d/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000000000275f -> 0x0000000000002760

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3301 Comm: syz-executor Not tainted 6.14.0-rc2-syzkaller-00039-g09fbf3d50205 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
==================================================================

Crashes (59):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/12 07:11 upstream 09fbf3d50205 f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/30 16:44 upstream 72deda0abee6 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/27 00:27 upstream c2da8b3f914f 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/26 07:49 upstream 0f8e26b38d7a 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/24 21:50 upstream 113691ce9f32 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/23 17:24 upstream 21266b8df522 a44b0418 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/22 06:56 upstream b9d8a295ed6b da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/20 23:56 upstream 100ceb4817a2 6e87cfa2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/20 05:56 upstream 9528d418de4d f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/19 06:48 upstream fda5e3f28400 f2cb035c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/17 04:57 upstream ce69b4019001 f9e07a6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/15 19:00 upstream 619f0b6fad52 968edaf4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/15 00:52 upstream c3812b15000c f310a27d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/10 23:15 upstream 2144da25584e 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/09 14:53 upstream eea6e4b4dfb8 9220929f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/06 11:15 upstream 9d89551994a4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2025/01/02 04:27 upstream 56e6a3499e14 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/25 12:19 upstream 9b2ffa6148b1 444551c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/21 00:17 upstream e9b8ffafd20a d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/17 12:10 upstream f44d154d6e3d f93b2b55 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/16 21:15 upstream 78d4f34e2115 eec85da6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/14 23:40 upstream a0e3919a2df2 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/14 10:44 upstream a446e965a188 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/08 05:57 upstream 7503345ac5f5 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/06 09:37 upstream b8f52214c61a 946d28f0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/04 20:49 upstream feffde684ac2 b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/12/04 00:28 upstream ceb8bf2ceaa7 b50eb251 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/30 09:02 upstream 509f806f7f70 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/22 05:14 upstream 28eb75e178d3 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/20 07:20 upstream bf9aa14fc523 7d02db5a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/18 18:33 upstream adc218676eef e7bb5d6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/15 10:41 upstream cfaaa7d010d1 f6ede3a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/12 07:29 upstream 2d5404caa8c7 75bb1b32 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/11 17:45 upstream 2d5404caa8c7 0c4b1325 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/08 16:12 upstream 906bd684e4b1 179b040e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/07 16:43 upstream ff7afaeca1a1 867e44df .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/04 03:01 upstream a33ab3f94f51 f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/11/03 19:05 upstream 11066801dd4b f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/10/21 23:02 upstream d12937763990 f1e4447c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/10/19 20:02 upstream 3d5ad2d4eca3 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/10/12 19:28 upstream 09f6b0c8904b 084d8178 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/10/08 02:25 upstream 87d6aab2389e d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/10/04 08:16 upstream 0c559323bbaa d7906eff .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/09/26 15:12 upstream 11a299a7933e 0d19f247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/09/25 19:48 upstream 684a64bf32b6 349a68c4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/09/24 04:43 upstream 18ba6034468e 89298aad .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/09/12 23:52 upstream fdf042df0463 60e1a995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/09/05 16:09 upstream c763c4339688 464ac2ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/08/20 23:00 upstream 521b1e7f4cf0 9f0ab3fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/08/18 07:18 upstream 810996a36309 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/08/16 13:40 upstream d7a5aa4b3c00 e1c76ab2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/08/13 12:36 upstream d74da846046a 7b0f4b46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/08/09 12:02 upstream ee9a43b7cfe2 a83d9288 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/07/31 17:53 upstream e4fc196f5ba3 6fde257d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/07/27 00:50 upstream 2f8c4f506285 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/07/17 05:52 upstream 0434dbe32053 215bec2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/07/13 11:08 upstream 528dd46d0fc3 eaeb5c15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/07/10 14:03 upstream 34afb82a3c67 bc144f9a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
2024/07/04 23:41 upstream 661e504db04c 3f2748a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in shmem_getattr / shmem_recalc_inode
* Struck through repros no longer work on HEAD.