loop4: p135 start 53543428 is beyond EOD, truncated loop4: p136 start 53543428 is beyond EOD, truncated loop4: p137 start 53543428 is beyond EOD, truncated loop4: p138 start 53543428 is beyond EOD, truncated loop4: p139 start 53543428 is beyond EOD, truncated loop4: p140 start 53543428 is beyond EOD, truncated ================================================================== BUG: KCSAN: data-race in _prb_read_valid / prb_reserve write to 0xffffffff86cb2aa0 of 88 bytes by task 15383 on cpu 0: prb_reserve+0x6fb/0xaf0 kernel/printk/printk_ringbuffer.c:1693 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 set_capacity_and_notify+0x1d5/0x230 block/genhd.c:93 loop_set_size+0x2e/0x70 drivers/block/loop.c:220 loop_configure+0x826/0x9c0 drivers/block/loop.c:1075 lo_ioctl+0x1e1/0x1390 drivers/block/loop.c:1530 blkdev_ioctl+0x387/0x460 block/ioctl.c:797 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 read to 0xffffffff86cb2aa0 of 8 bytes by task 15331 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:500 [inline] prb_first_seq kernel/printk/printk_ringbuffer.c:2017 [inline] _prb_read_valid+0x325/0x930 kernel/printk/printk_ringbuffer.c:2174 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2245 printk_get_next_message+0xea/0x550 kernel/printk/printk.c:3052 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x2bc/0x6b0 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xa1/0x280 kernel/printk/printk.c:3413 vprintk_emit+0x3e4/0x600 kernel/printk/printk.c:2479 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 disk_unlock_native_capacity block/partitions/core.c:522 [inline] blk_add_partition block/partitions/core.c:545 [inline] blk_add_partitions block/partitions/core.c:635 [inline] bdev_disk_changed+0xacb/0xe20 block/partitions/core.c:695 loop_reread_partitions drivers/block/loop.c:443 [inline] loop_set_status+0x5af/0x670 drivers/block/loop.c:1272 loop_set_status64 drivers/block/loop.c:1368 [inline] lo_ioctl+0x66d/0x1390 drivers/block/loop.c:1554 blkdev_ioctl+0x387/0x460 block/ioctl.c:797 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: 0x0000000000006586 -> 0x0000000000008586 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 15331 Comm: syz.4.3264 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== loop4: p141 start 53543428 is beyond EOD, truncated loop4: p142 start 53543428 is beyond EOD, truncated loop4: p143 start 53543428 is beyond EOD, truncated loop4: p144 start 53543428 is beyond EOD, truncated loop4: p145 start 53543428 is beyond EOD, truncated loop4: p146 start 53543428 is beyond EOD, truncated loop4: p147 start 53543428 is beyond EOD, truncated loop4: p148 start 53543428 is beyond EOD, truncated loop4: p149 start 53543428 is beyond EOD, truncated loop4: p150 start 53543428 is beyond EOD, truncated loop4: p151 start 53543428 is beyond EOD, truncated loop4: p152 start 53543428 is beyond EOD, truncated loop4: p153 start 53543428 is beyond EOD, truncated loop4: p154 start 53543428 is beyond EOD, truncated loop4: p155 start 53543428 is beyond EOD, truncated loop4: p156 start 53543428 is beyond EOD, truncated loop4: p157 start 53543428 is beyond EOD, truncated loop4: p158 start 53543428 is beyond EOD, truncated loop4: p159 start 53543428 is beyond EOD, truncated loop4: p160 start 53543428 is beyond EOD, truncated loop4: p161 start 53543428 is beyond EOD, truncated loop4: p162 start 53543428 is beyond EOD, truncated loop4: p163 start 53543428 is beyond EOD, truncated loop4: p164 start 53543428 is beyond EOD, truncated loop4: p165 start 53543428 is beyond EOD, truncated loop4: p166 start 53543428 is beyond EOD, truncated loop4: p167 start 53543428 is beyond EOD, truncated loop4: p168 start 53543428 is beyond EOD, truncated loop4: p169 start 53543428 is beyond EOD, truncated loop4: p170 start 53543428 is beyond EOD, truncated loop4: p171 start 53543428 is beyond EOD, truncated loop4: p172 start 53543428 is beyond EOD, truncated loop4: p173 start 53543428 is beyond EOD, truncated loop4: p174 start 53543428 is beyond EOD, truncated loop4: p175 start 53543428 is beyond EOD, truncated loop4: p176 start 53543428 is beyond EOD, truncated loop4: p177 start 53543428 is beyond EOD, truncated loop4: p178 start 53543428 is beyond EOD, truncated loop4: p179 start 53543428 is beyond EOD, truncated loop4: p180 start 53543428 is beyond EOD, truncated loop4: p181 start 53543428 is beyond EOD, truncated loop4: p182 start 53543428 is beyond EOD, truncated loop4: p183 start 53543428 is beyond EOD, truncated loop4: p184 start 53543428 is beyond EOD, truncated loop4: p185 start 53543428 is beyond EOD, truncated loop4: p186 start 53543428 is beyond EOD, truncated loop4: p187 start 53543428 is beyond EOD, truncated loop4: p188 start 53543428 is beyond EOD, truncated loop4: p189 start 53543428 is beyond EOD, truncated loop4: p190 start 53543428 is beyond EOD, truncated loop4: p191 start 53543428 is beyond EOD, truncated loop4: p192 start 53543428 is beyond EOD, truncated loop4: p193 start 53543428 is beyond EOD, truncated loop4: p194 start 53543428 is beyond EOD, truncated loop4: p195 start 53543428 is beyond EOD, truncated loop4: p196 start 53543428 is beyond EOD, truncated loop4: p197 start 53543428 is beyond EOD, truncated loop4: p198 start 53543428 is beyond EOD, truncated loop4: p199 start 53543428 is beyond EOD, truncated loop4: p200 start 53543428 is beyond EOD, truncated loop4: p201 start 53543428 is beyond EOD, truncated loop4: p202 start 53543428 is beyond EOD, truncated loop4: p203 start 53543428 is beyond EOD, truncated loop4: p204 start 53543428 is beyond EOD, truncated loop4: p205 start 53543428 is beyond EOD, truncated loop4: p206 start 53543428 is beyond EOD, truncated loop4: p207 start 53543428 is beyond EOD, truncated loop4: p208 start 53543428 is beyond EOD, truncated loop4: p209 start 53543428 is beyond EOD, truncated loop4: p210 start 53543428 is beyond EOD, truncated loop4: p211 start 53543428 is beyond EOD, truncated loop4: p212 start 53543428 is beyond EOD, truncated loop4: p213 start 53543428 is beyond EOD, truncated loop4: p214 start 53543428 is beyond EOD, truncated loop4: p215 start 53543428 is beyond EOD, truncated loop4: p216 start 53543428 is beyond EOD, truncated loop4: p217 start 53543428 is beyond EOD, truncated loop4: p218 start 53543428 is beyond EOD, truncated loop4: p219 start 53543428 is beyond EOD, truncated loop4: p220 start 53543428 is beyond EOD, truncated loop4: p221 start 53543428 is beyond EOD, truncated loop4: p222 start 53543428 is beyond EOD, truncated loop4: p223 start 53543428 is beyond EOD, truncated loop4: p224 start 53543428 is beyond EOD, truncated loop4: p225 start 53543428 is beyond EOD, truncated loop4: p226 start 53543428 is beyond EOD, truncated loop4: p227 start 53543428 is beyond EOD, truncated loop4: p228 start 53543428 is beyond EOD, truncated loop4: p229 start 53543428 is beyond EOD, truncated loop4: p230 start 53543428 is beyond EOD, truncated loop4: p231 start 53543428 is beyond EOD, truncated loop4: p232 start 53543428 is beyond EOD, truncated loop4: p233 start 53543428 is beyond EOD, truncated loop4: p234 start 53543428 is beyond EOD, truncated loop4: p235 start 53543428 is beyond EOD, truncated loop4: p236 start 53543428 is beyond EOD, truncated loop4: p237 start 53543428 is beyond EOD, truncated loop4: p238 start 53543428 is beyond EOD, truncated loop4: p239 start 53543428 is beyond EOD, truncated loop4: p240 start 53543428 is beyond EOD, truncated loop4: p241 start 53543428 is beyond EOD, truncated loop4: p242 start 53543428 is beyond EOD, truncated loop4: p243 start 53543428 is beyond EOD, truncated loop4: p244 start 53543428 is beyond EOD, truncated loop4: p245 start 53543428 is beyond EOD, truncated loop4: p246 start 53543428 is beyond EOD, truncated loop4: p247 start 53543428 is beyond EOD, truncated loop4: p248 start 53543428 is beyond EOD, truncated loop4: p249 start 53543428 is beyond EOD, truncated loop4: p250 start 53543428 is beyond EOD, truncated loop4: p251 start 53543428 is beyond EOD, truncated loop4: p252 start 53543428 is beyond EOD, truncated loop4: p253 start 53543428 is beyond EOD, truncated loop4: p254 start 53543428 is beyond EOD, truncated loop4: p255 start 53543428 is beyond EOD, truncated