loop0: detected capacity change from 0 to 764
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86677c70 of 8 bytes by task 14261 on cpu 1:
 data_alloc+0x291/0x2c0 kernel/printk/printk_ringbuffer.c:1096
 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 get_symlink_chunk fs/isofs/rock.c:634 [inline]
 rock_ridge_symlink_read_folio+0x58e/0x8a0 fs/isofs/rock.c:756
 filemap_read_folio mm/filemap.c:2358 [inline]
 do_read_cache_folio+0x108/0x5b0 mm/filemap.c:3903
 do_read_cache_page mm/filemap.c:3969 [inline]
 read_cache_page+0x3a/0xb0 mm/filemap.c:3978
 read_mapping_page include/linux/pagemap.h:1005 [inline]
 page_get_link+0x3c/0x340 fs/namei.c:5373
 pick_link+0x43f/0x7e0
 step_into+0x748/0x820 fs/namei.c:1982
 walk_component+0x169/0x230 fs/namei.c:2118
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2634
 filename_lookup+0x150/0x340 fs/namei.c:2663
 user_path_at+0x3c/0x120 fs/namei.c:3070
 do_mount fs/namespace.c:3897 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x24b/0x2d0 fs/namespace.c:4088
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4088
 x64_sys_call+0x2c84/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:166
 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

read to 0xffffffff86677c70 of 8 bytes by task 14259 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:482 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:778 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:924 [inline]
 prb_reserve+0x235/0xb60 kernel/printk/printk_ringbuffer.c:1619
 vprintk_store+0x558/0x870 kernel/printk/printk.c:2326
 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2408
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2447
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x7a/0xa0 kernel/printk/printk.c:2457
 isofs_read_inode fs/isofs/inode.c:1377 [inline]
 __isofs_iget+0xed4/0xf80 fs/isofs/inode.c:1509
 isofs_iget fs/isofs/isofs.h:133 [inline]
 isofs_get_blocks+0x18c/0x4a0 fs/isofs/inode.c:1064
 isofs_get_block fs/isofs/inode.c:1117 [inline]
 isofs_bmap fs/isofs/inode.c:1128 [inline]
 isofs_bread+0x5b/0x100 fs/isofs/inode.c:1136
 isofs_find_entry fs/isofs/namei.c:59 [inline]
 isofs_lookup+0x189/0x8c0 fs/isofs/namei.c:165
 __lookup_slow+0x184/0x250 fs/namei.c:1791
 lookup_slow+0x3c/0x60 fs/namei.c:1808
 walk_component+0x1f5/0x230 fs/namei.c:2112
 lookup_last fs/namei.c:2610 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2634
 filename_lookup+0x150/0x340 fs/namei.c:2663
 user_path_at+0x3c/0x120 fs/namei.c:3070
 do_mount fs/namespace.c:3897 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x24b/0x2d0 fs/namespace.c:4088
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4088
 x64_sys_call+0x2c84/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:166
 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: 0xffffffffffff9598 -> 0x00000000000992b8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14259 Comm: syz.0.3611 Not tainted 6.13.0-syzkaller-05474-g113691ce9f32 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
==================================================================
Symlink component flag not implemented
Symlink component flag not implemented (129)
rock: directory entry would overflow storage
rock: sig=0x4f50, size=4, remaining=3
iso9660: Corrupted directory entry in block 6 of inode 1792