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================================================================== BUG: KCSAN: data-race in __fat_write_inode / fat16_ent_get read to 0xffff88811ce0127e of 2 bytes by task 27825 on cpu 0: fat16_ent_get+0x2d/0x80 fs/fat/fatent.c:138 fat_ent_read+0x3d0/0x550 fs/fat/fatent.c:370 fat_free_clusters+0x15e/0x760 fs/fat/fatent.c:566 fat_add_cluster+0xbc/0xd0 fs/fat/inode.c:114 __fat_get_block fs/fat/inode.c:154 [inline] fat_get_block+0x3ae/0x4e0 fs/fat/inode.c:189 __block_write_begin_int+0x2ea/0xf10 fs/buffer.c:2008 __block_write_begin fs/buffer.c:2058 [inline] block_write_begin+0x77/0x160 fs/buffer.c:2117 cont_write_begin+0x3d6/0x670 fs/buffer.c:2466 fat_write_begin+0x72/0xc0 fs/fat/inode.c:235 pagecache_write_begin+0x6b/0x90 mm/filemap.c:3128 cont_expand_zero fs/buffer.c:2393 [inline] cont_write_begin+0x17a/0x670 fs/buffer.c:2456 fat_write_begin+0x72/0xc0 fs/fat/inode.c:235 pagecache_write_begin+0x6b/0x90 mm/filemap.c:3128 generic_cont_expand_simple+0xb0/0x120 fs/buffer.c:2357 fat_cont_expand+0x4e/0x1c0 fs/fat/file.c:222 fat_setattr+0x75d/0x840 fs/fat/file.c:501 notify_change+0x7e1/0xaa0 fs/attr.c:337 do_truncate+0xfb/0x180 fs/open.c:64 do_sys_ftruncate+0x30f/0x340 fs/open.c:195 __do_sys_ftruncate fs/open.c:205 [inline] __se_sys_ftruncate fs/open.c:203 [inline] __x64_sys_ftruncate+0x3f/0x50 fs/open.c:203 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88811ce0127c of 4 bytes by task 27821 on cpu 1: __fat_write_inode+0x247/0x520 fs/fat/inode.c:876 fat_write_inode+0x6d/0xf0 fs/fat/inode.c:908 write_inode fs/fs-writeback.c:1312 [inline] __writeback_single_inode+0x6f7/0x8e0 fs/fs-writeback.c:1511 writeback_single_inode+0x232/0x310 fs/fs-writeback.c:1565 sync_inode fs/fs-writeback.c:2602 [inline] sync_inode_metadata+0x74/0xa0 fs/fs-writeback.c:2622 __generic_file_fsync+0x122/0x190 fs/libfs.c:1011 fat_file_fsync+0x58/0x120 fs/fat/file.c:190 vfs_fsync_range+0x82/0x150 fs/sync.c:197 generic_write_sync include/linux/fs.h:2856 [inline] generic_file_write_iter+0x318/0x38c mm/filemap.c:3474 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 27821 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2019/12/24 00:38 | https://github.com/google/ktsan.git kcsan | 245a43005292 | be5c2c81 | .config | console log | report | ci2-upstream-kcsan-gce |