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================================================================== BUG: KCSAN: data-race in file_update_time / inode_set_ctime_current write to 0xffff888106eef140 of 8 bytes by task 11549 on cpu 0: inode_set_ctime_current+0x533/0x770 fs/inode.c:2763 inode_update_timestamps+0x84/0x270 fs/inode.c:2018 generic_update_time fs/inode.c:2057 [inline] inode_update_time fs/inode.c:2077 [inline] __file_update_time fs/inode.c:2305 [inline] file_update_time+0x20e/0x2b0 fs/inode.c:2335 ext4_page_mkwrite+0x18b/0xba0 fs/ext4/inode.c:6577 do_page_mkwrite mm/memory.c:3378 [inline] wp_page_shared mm/memory.c:3779 [inline] do_wp_page+0xe5a/0x2400 mm/memory.c:3998 handle_pte_fault mm/memory.c:6085 [inline] __handle_mm_fault mm/memory.c:6212 [inline] handle_mm_fault+0x77d/0x2be0 mm/memory.c:6381 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 read to 0xffff888106eef140 of 8 bytes by task 11556 on cpu 1: inode_get_ctime_sec include/linux/fs.h:1743 [inline] inode_get_ctime include/linux/fs.h:1753 [inline] inode_needs_update_time fs/inode.c:2288 [inline] file_update_time+0xca/0x2b0 fs/inode.c:2331 ext4_page_mkwrite+0x18b/0xba0 fs/ext4/inode.c:6577 do_page_mkwrite mm/memory.c:3378 [inline] do_shared_fault mm/memory.c:5666 [inline] do_fault mm/memory.c:5728 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6069 [inline] __handle_mm_fault mm/memory.c:6212 [inline] handle_mm_fault+0x15cb/0x2be0 mm/memory.c:6381 do_user_addr_fault+0x793/0x1090 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:68 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline] _inline_copy_to_user include/linux/uaccess.h:197 [inline] _copy_to_user+0x7c/0xa0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] rng_dev_read+0x3ef/0x740 drivers/char/hw_random/core.c:258 do_loop_readv_writev fs/read_write.c:847 [inline] vfs_readv+0x3f8/0x690 fs/read_write.c:1020 do_preadv fs/read_write.c:1132 [inline] __do_sys_preadv fs/read_write.c:1179 [inline] __se_sys_preadv fs/read_write.c:1174 [inline] __x64_sys_preadv+0xfd/0x1c0 fs/read_write.c:1174 x64_sys_call+0x1503/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:296 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 value changed: 0x00000000000000b9 -> 0x00000000000000ba Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 11556 Comm: syz.5.2620 Not tainted 6.16.0-rc6-syzkaller-00279-gbf61759db409 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== EXT4-fs error (device loop5): ext4_mb_mark_diskspace_used:4113: comm syz.5.2620: Allocating blocks 497-513 which overlap fs metadata
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2025/07/20 12:45 | upstream | bf61759db409 | 7117feec | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in file_update_time / inode_set_ctime_current |