Symlink component flag not implemented (116)
==================================================================
BUG: KCSAN: data-race in _prb_read_valid / prb_reserve

write to 0xffffffff868f9340 of 88 bytes by task 4780 on cpu 1:
 prb_reserve+0x695/0xaf0 kernel/printk/printk_ringbuffer.c:1651
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2299
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 br_set_state+0x28c/0x390 net/bridge/br_stp.c:57
 br_init_port net/bridge/br_stp_if.c:39 [inline]
 br_stp_enable_port+0x5e/0x110 net/bridge/br_stp_if.c:93
 br_port_carrier_check+0x200/0x230 net/bridge/br_if.c:89
 br_device_event+0x421/0x640 net/bridge/br.c:101
 notifier_call_chain kernel/notifier.c:85 [inline]
 raw_notifier_call_chain+0x6f/0x1b0 kernel/notifier.c:453
 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:2229
 netif_state_change+0x16d/0x1f0 net/core/dev.c:1583
 linkwatch_do_dev+0xb9/0xf0 net/core/link_watch.c:186
 __linkwatch_run_queue+0x582/0x850 net/core/link_watch.c:244
 linkwatch_event+0x40/0x50 net/core/link_watch.c:304
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346
 worker_thread+0x582/0x770 kernel/workqueue.c:3427
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffffffff868f9340 of 8 bytes by task 15430 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:483 [inline]
 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1892 [inline]
 prb_read kernel/printk/printk_ringbuffer.c:1940 [inline]
 _prb_read_valid+0x1c4/0x920 kernel/printk/printk_ringbuffer.c:2131
 desc_update_last_finalized kernel/printk/printk_ringbuffer.c:1531 [inline]
 prb_final_commit+0x136/0x1e0 kernel/printk/printk_ringbuffer.c:1800
 vprintk_store+0x741/0x860 kernel/printk/printk.c:2325
 vprintk_emit+0x10d/0x580 kernel/printk/printk.c:2399
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2438
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2448
 get_symlink_chunk fs/isofs/rock.c:640 [inline]
 rock_ridge_symlink_read_folio+0x58f/0x8a0 fs/isofs/rock.c:762
 filemap_read_folio mm/filemap.c:2444 [inline]
 do_read_cache_folio+0x196/0x5b0 mm/filemap.c:4024
 read_cache_folio+0x3c/0x50 mm/filemap.c:4056
 read_mapping_folio include/linux/pagemap.h:999 [inline]
 __page_get_link+0x36/0x170 fs/namei.c:5512
 page_get_link+0x25/0x80 fs/namei.c:5542
 pick_link+0x41d/0x830 fs/namei.c:-1
 step_into+0x790/0x7f0 fs/namei.c:2021
 walk_component+0x162/0x220 fs/namei.c:2157
 lookup_last fs/namei.c:2652 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2676
 filename_lookup+0x147/0x340 fs/namei.c:2705
 user_path_at+0x3e/0x130 fs/namei.c:3215
 do_utimes_path fs/utimes.c:95 [inline]
 do_utimes+0xd9/0x210 fs/utimes.c:140
 do_futimesat fs/utimes.c:194 [inline]
 __do_sys_futimesat fs/utimes.c:201 [inline]
 __se_sys_futimesat fs/utimes.c:198 [inline]
 __x64_sys_futimesat+0xd2/0x1a0 fs/utimes.c:198
 x64_sys_call+0x2ec1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:262
 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: 0x00000000000031a6 -> 0x00000000000051a6

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 15430 Comm: syz.7.15931 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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