loop0: p57 start 849426176 is beyond EOD, truncated loop0: p58 start 849426176 is beyond EOD, truncated loop0: p59 start 849426176 is beyond EOD, truncated loop0: p60 start 849426176 is beyond EOD, truncated loop0: p61 start 849426176 is beyond EOD, truncated loop0: p62 start 849426176 is beyond EOD, truncated loop0: p63 start 849426176 is beyond EOD, truncated ================================================================== BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff86c848a0 of 8 bytes by task 17820 on cpu 1: data_alloc+0x308/0x380 kernel/printk/printk_ringbuffer.c:1130 prb_reserve+0x8e3/0xaf0 kernel/printk/printk_ringbuffer.c:1727 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2504 __ext4_msg+0x143/0x1c0 fs/ext4/super.c:1003 ext4_parse_param+0xe44/0xfb0 fs/ext4/super.c:-1 vfs_parse_fs_param+0x142/0x2a0 fs/fs_context.c:132 vfs_parse_fs_qstr fs/fs_context.c:173 [inline] vfs_parse_fs_string include/linux/fs_context.h:142 [inline] vfs_parse_monolithic_sep+0x1e6/0x270 fs/fs_context.c:213 generic_parse_monolithic+0x24/0x30 fs/fs_context.c:241 parse_monolithic_mount_data+0x46/0x60 fs/fs_context.c:519 do_new_mount+0x24e/0x8d0 fs/namespace.c:3837 path_mount+0x4ad/0xb90 fs/namespace.c:4161 do_mount fs/namespace.c:4174 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount+0x28c/0x2e0 fs/namespace.c:4367 __x64_sys_mount+0x67/0x80 fs/namespace.c:4367 x64_sys_call+0x2d61/0x3020 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c848a0 of 8 bytes by task 2981 on cpu 0: desc_read kernel/printk/printk_ringbuffer.c:496 [inline] desc_push_tail kernel/printk/printk_ringbuffer.c:792 [inline] desc_reserve kernel/printk/printk_ringbuffer.c:938 [inline] prb_reserve+0x21a/0xaf0 kernel/printk/printk_ringbuffer.c:1677 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2504 blk_add_partition block/partitions/core.c:542 [inline] blk_add_partitions block/partitions/core.c:635 [inline] bdev_disk_changed+0x997/0xe20 block/partitions/core.c:695 blkdev_get_whole+0x1e8/0x2c0 block/bdev.c:751 bdev_open+0x279/0x7d0 block/bdev.c:960 bdev_file_open_by_dev+0x1cc/0x230 block/bdev.c:1062 disk_scan_partitions+0x149/0x1b0 block/genhd.c:387 blkdev_common_ioctl+0x120d/0x2060 block/ioctl.c:712 blkdev_ioctl+0x31f/0x460 block/ioctl.c:791 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583 x64_sys_call+0x1563/0x3020 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000000391f8 -> 0x00000000000eadd8 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 2981 Comm: udevd Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 ================================================================== loop0: p64 start 849426176 is beyond EOD, truncated loop0: p65 start 849426176 is beyond EOD, truncated loop0: p66 start 849426176 is beyond EOD, truncated loop0: p67 start 849426176 is beyond EOD, truncated loop0: p68 start 849426176 is beyond EOD, truncated loop0: p69 start 849426176 is beyond EOD, truncated loop0: p70 start 849426176 is beyond EOD, truncated loop0: p71 start 849426176 is beyond EOD, truncated loop0: p72 start 849426176 is beyond EOD, truncated loop0: p73 start 849426176 is beyond EOD, truncated loop0: p74 start 849426176 is beyond EOD, truncated loop0: p75 start 849426176 is beyond EOD, truncated loop0: p76 start 849426176 is beyond EOD, truncated loop0: p77 start 849426176 is beyond EOD, truncated loop0: p78 start 849426176 is beyond EOD, truncated loop0: p79 start 849426176 is beyond EOD, truncated loop0: p80 start 849426176 is beyond EOD, truncated loop0: p81 start 849426176 is beyond EOD, truncated loop0: p82 start 849426176 is beyond EOD, truncated loop0: p83 start 849426176 is beyond EOD, truncated loop0: p84 start 849426176 is beyond EOD, truncated loop0: p85 start 849426176 is beyond EOD, truncated loop0: p86 start 849426176 is beyond EOD, truncated loop0: p87 start 849426176 is beyond EOD, truncated loop0: p88 start 849426176 is beyond EOD, truncated loop0: p89 start 849426176 is beyond EOD, truncated loop0: p90 start 849426176 is beyond EOD, truncated loop0: p91 start 849426176 is beyond EOD, truncated loop0: p92 start 849426176 is beyond EOD, truncated loop0: p93 start 849426176 is beyond EOD, truncated loop0: p94 start 849426176 is beyond EOD, truncated loop0: p95 start 849426176 is beyond EOD, truncated loop0: p96 start 849426176 is beyond EOD, truncated loop0: p97 start 849426176 is beyond EOD, truncated loop0: p98 start 849426176 is beyond EOD, truncated loop0: p99 start 849426176 is beyond EOD, truncated loop0: p100 start 849426176 is beyond EOD, truncated loop0: p101 start 849426176 is beyond EOD, truncated loop0: p102 start 849426176 is beyond EOD, truncated loop0: p103 start 849426176 is beyond EOD, truncated loop0: p104 start 849426176 is beyond EOD, truncated loop0: p105 start 849426176 is beyond EOD, truncated loop0: p106 start 849426176 is beyond EOD, truncated loop0: p107 start 849426176 is beyond EOD, truncated loop0: p108 start 849426176 is beyond EOD, truncated loop0: p109 start 849426176 is beyond EOD, truncated loop0: p110 start 849426176 is beyond EOD, truncated loop0: p111 start 849426176 is beyond EOD, truncated loop0: p112 start 849426176 is beyond EOD, truncated loop0: p113 start 849426176 is beyond EOD, truncated loop0: p114 start 849426176 is beyond EOD, truncated loop0: p115 start 849426176 is beyond EOD, truncated loop0: p116 start 849426176 is beyond EOD, truncated loop0: p117 start 849426176 is beyond EOD, truncated loop0: p118 start 849426176 is beyond EOD, truncated loop0: p119 start 849426176 is beyond EOD, truncated loop0: p120 start 849426176 is beyond EOD, truncated loop0: p121 start 849426176 is beyond EOD, truncated loop0: p122 start 849426176 is beyond EOD, truncated loop0: p123 start 849426176 is beyond EOD, truncated loop0: p124 start 849426176 is beyond EOD, truncated loop0: p125 start 849426176 is beyond EOD, truncated loop0: p126 start 849426176 is beyond EOD, truncated loop0: p127 start 849426176 is beyond EOD, truncated loop0: p128 start 849426176 is beyond EOD, truncated loop0: p129 start 849426176 is beyond EOD, truncated loop0: p130 start 849426176 is beyond EOD, truncated loop0: p131 start 849426176 is beyond EOD, truncated loop0: p132 start 849426176 is beyond EOD, truncated loop0: p133 start 849426176 is beyond EOD, truncated loop0: p134 start 849426176 is beyond EOD, truncated loop0: p135 start 849426176 is beyond EOD, truncated loop0: p136 start 849426176 is beyond EOD, truncated loop0: p137 start 849426176 is beyond EOD, truncated loop0: p138 start 849426176 is beyond EOD, truncated loop0: p139 start 849426176 is beyond EOD, truncated loop0: p140 start 849426176 is beyond EOD, truncated loop0: p141 start 849426176 is beyond EOD, truncated loop0: p142 start 849426176 is beyond EOD, truncated loop0: p143 start 849426176 is beyond EOD, truncated loop0: p144 start 849426176 is beyond EOD, truncated loop0: p145 start 849426176 is beyond EOD, truncated loop0: p146 start 849426176 is beyond EOD, truncated loop0: p147 start 849426176 is beyond EOD, truncated loop0: p148 start 849426176 is beyond EOD, truncated loop0: p149 start 849426176 is beyond EOD, truncated loop0: p150 start 849426176 is beyond EOD, truncated loop0: p151 start 849426176 is beyond EOD, truncated loop0: p152 start 849426176 is beyond EOD, truncated loop0: p153 start 849426176 is beyond EOD, truncated loop0: p154 start 849426176 is beyond EOD, truncated loop0: p155 start 849426176 is beyond EOD, truncated loop0: p156 start 849426176 is beyond EOD, truncated loop0: p157 start 849426176 is beyond EOD, truncated loop0: p158 start 849426176 is beyond EOD, truncated loop0: p159 start 849426176 is beyond EOD, truncated loop0: p160 start 849426176 is beyond EOD, truncated loop0: p161 start 849426176 is beyond EOD, truncated loop0: p162 start 849426176 is beyond EOD, truncated loop0: p163 start 849426176 is beyond EOD, truncated loop0: p164 start 849426176 is beyond EOD, truncated loop0: p165 start 849426176 is beyond EOD, truncated loop0: p166 start 849426176 is beyond EOD, truncated loop0: p167 start 849426176 is beyond EOD, truncated loop0: p168 start 849426176 is beyond EOD, truncated loop0: p169 start 849426176 is beyond EOD, truncated loop0: p170 start 849426176 is beyond EOD, truncated loop0: p171 start 849426176 is beyond EOD, truncated loop0: p172 start 849426176 is beyond EOD, truncated loop0: p173 start 849426176 is beyond EOD, truncated loop0: p174 start 849426176 is beyond EOD, truncated loop0: p175 start 849426176 is beyond EOD, truncated loop0: p176 start 849426176 is beyond EOD, truncated loop0: p177 start 849426176 is beyond EOD, truncated loop0: p178 start 849426176 is beyond EOD, truncated loop0: p179 start 849426176 is beyond EOD, truncated loop0: p180 start 849426176 is beyond EOD, truncated loop0: p181 start 849426176 is beyond EOD, truncated loop0: p182 start 849426176 is beyond EOD, truncated loop0: p183 start 849426176 is beyond EOD, truncated loop0: p184 start 849426176 is beyond EOD, truncated loop0: p185 start 849426176 is beyond EOD, truncated loop0: p186 start 849426176 is beyond EOD, truncated loop0: p187 start 849426176 is beyond EOD, truncated loop0: p188 start 849426176 is beyond EOD, truncated loop0: p189 start 849426176 is beyond EOD, truncated loop0: p190 start 849426176 is beyond EOD, truncated loop0: p191 start 849426176 is beyond EOD, truncated loop0: p192 start 849426176 is beyond EOD, truncated loop0: p193 start 849426176 is beyond EOD, truncated loop0: p194 start 849426176 is beyond EOD, truncated loop0: p195 start 849426176 is beyond EOD, truncated loop0: p196 start 849426176 is beyond EOD, truncated loop0: p197 start 849426176 is beyond EOD, truncated loop0: p198 start 849426176 is beyond EOD, truncated loop0: p199 start 849426176 is beyond EOD, truncated loop0: p200 start 849426176 is beyond EOD, truncated loop0: p201 start 849426176 is beyond EOD, truncated loop0: p202 start 849426176 is beyond EOD, truncated loop0: p203 start 849426176 is beyond EOD, truncated loop0: p204 start 849426176 is beyond EOD, truncated loop0: p205 start 849426176 is beyond EOD, truncated loop0: p206 start 849426176 is beyond EOD, truncated loop0: p207 start 849426176 is beyond EOD, truncated loop0: p208 start 849426176 is beyond EOD, truncated loop0: p209 start 849426176 is beyond EOD, truncated loop0: p210 start 849426176 is beyond EOD, truncated loop0: p211 start 849426176 is beyond EOD, truncated loop0: p212 start 849426176 is beyond EOD, truncated loop0: p213 start 849426176 is beyond EOD, truncated loop0: p214 start 849426176 is beyond EOD, truncated loop0: p215 start 849426176 is beyond EOD, truncated loop0: p216 start 849426176 is beyond EOD, truncated loop0: p217 start 849426176 is beyond EOD, truncated loop0: p218 start 849426176 is beyond EOD, truncated loop0: p219 start 849426176 is beyond EOD, truncated loop0: p220 start 849426176 is beyond EOD, truncated loop0: p221 start 849426176 is beyond EOD, truncated loop0: p222 start 849426176 is beyond EOD, truncated loop0: p223 start 849426176 is beyond EOD, truncated loop0: p224 start 849426176 is beyond EOD, truncated loop0: p225 start 849426176 is beyond EOD, truncated loop0: p226 start 849426176 is beyond EOD, truncated loop0: p227 start 849426176 is beyond EOD, truncated loop0: p228 start 849426176 is beyond EOD, truncated loop0: p229 start 849426176 is beyond EOD, truncated loop0: p230 start 849426176 is beyond EOD, truncated loop0: p231 start 849426176 is beyond EOD, truncated loop0: p232 start 849426176 is beyond EOD, truncated loop0: p233 start 849426176 is beyond EOD, truncated loop0: p234 start 849426176 is beyond EOD, truncated loop0: p235 start 849426176 is beyond EOD, truncated loop0: p236 start 849426176 is beyond EOD, truncated loop0: p237 start 849426176 is beyond EOD, truncated loop0: p238 start 849426176 is beyond EOD, truncated loop0: p239 start 849426176 is beyond EOD, truncated loop0: p240 start 849426176 is beyond EOD, truncated loop0: p241 start 849426176 is beyond EOD, truncated loop0: p242 start 849426176 is beyond EOD, truncated loop0: p243 start 849426176 is beyond EOD, truncated loop0: p244 start 849426176 is beyond EOD, truncated loop0: p245 start 849426176 is beyond EOD, truncated loop0: p246 start 849426176 is beyond EOD, truncated loop0: p247 start 849426176 is beyond EOD, truncated loop0: p248 start 849426176 is beyond EOD, truncated loop0: p249 start 849426176 is beyond EOD, truncated loop0: p250 start 849426176 is beyond EOD, truncated loop0: p251 start 849426176 is beyond EOD, truncated loop0: p252 start 849426176 is beyond EOD, truncated loop0: p253 start 849426176 is beyond EOD, truncated loop0: p254 start 849426176 is beyond EOD, truncated loop0: p255 start 849426176 is beyond EOD, truncated