BUG: KCSAN: data-race in detach_buf_split / virtqueue_add read to 0xffff888101913e48 of 4 bytes by task 26544 on cpu 0: virtqueue_add_split drivers/virtio/virtio_ring.c:553 [inline] virtqueue_add+0x4b3/0x20e0 drivers/virtio/virtio_ring.c:2133 virtqueue_add_inbuf+0x53/0x80 drivers/virtio/virtio_ring.c:2212 request_entropy drivers/char/hw_random/virtio-rng.c:61 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1c5/0x3f0 drivers/char/hw_random/virtio-rng.c:92 rng_get_data drivers/char/hw_random/core.c:197 [inline] rng_dev_read+0x1a7/0x5e0 drivers/char/hw_random/core.c:234 vfs_read+0x19f/0x5c0 fs/read_write.c:468 ksys_read+0xeb/0x1a0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __x64_sys_read+0x42/0x50 fs/read_write.c:621 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read-write to 0xffff888101913e48 of 4 bytes by interrupt on cpu 1: detach_buf_split+0x2fc/0x570 drivers/virtio/virtio_ring.c:757 virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:835 [inline] virtqueue_get_buf_ctx+0x3c2/0x5b0 drivers/virtio/virtio_ring.c:2327 virtqueue_get_buf+0x1f/0x30 drivers/virtio/virtio_ring.c:2333 random_recv_done+0x4c/0x90 drivers/char/hw_random/virtio-rng.c:42 vring_interrupt+0x150/0x170 drivers/virtio/virtio_ring.c:2501 __handle_irq_event_percpu+0x91/0x490 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210 handle_edge_irq+0x167/0x590 kernel/irq/chip.c:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x3d/0x90 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 is_atomic kernel/kcsan/core.c:249 [inline] should_watch kernel/kcsan/core.c:277 [inline] check_access kernel/kcsan/core.c:752 [inline] __tsan_read8+0xe4/0x180 kernel/kcsan/core.c:1025 pie_calculate_probability+0x3eb/0x520 net/sched/sch_pie.c:408 fq_pie_timer+0xbc/0x150 net/sched/sch_fq_pie.c:387 call_timer_fn+0x35/0x290 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x46c/0x650 kernel/time/timer.c:2022 run_timer_softirq+0x1d/0x40 kernel/time/timer.c:2035 __do_softirq+0xc1/0x265 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0x3b/0x90 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x6d/0x80 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 check_access kernel/kcsan/core.c:750 [inline] __tsan_read1+0xcf/0x180 kernel/kcsan/core.c:1022 crc32_body lib/crc32.c:121 [inline] crc32_le_generic lib/crc32.c:179 [inline] __crc32c_le_base+0x232/0x520 lib/crc32.c:201 chksum_update+0x32/0x50 crypto/crc32c_generic.c:88 crypto_shash_update+0x136/0x1a0 crypto/shash.c:134 ext4_chksum fs/ext4/ext4.h:2399 [inline] ext4_inode_csum+0x410/0x4b0 fs/ext4/inode.c:77 ext4_inode_csum_set fs/ext4/inode.c:115 [inline] ext4_fill_raw_inode+0xd22/0xe60 fs/ext4/inode.c:4329 ext4_do_update_inode fs/ext4/inode.c:5083 [inline] ext4_mark_iloc_dirty+0x2e9/0xe10 fs/ext4/inode.c:5715 __ext4_mark_inode_dirty+0x314/0x440 fs/ext4/inode.c:5919 ext4_dirty_inode+0x91/0xb0 fs/ext4/inode.c:5948 __mark_inode_dirty+0x169/0x7d0 fs/fs-writeback.c:2424 mark_inode_dirty include/linux/fs.h:2149 [inline] generic_write_end+0x18e/0x360 fs/buffer.c:2256 ext4_da_write_end+0x4df/0x690 fs/ext4/inode.c:3012 generic_perform_write+0x253/0x3d0 mm/filemap.c:3957 ext4_buffered_write_iter+0x240/0x3e0 fs/ext4/file.c:300 ext4_file_write_iter+0xdd/0x10f0 __kernel_write_iter+0x162/0x3c0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x25d/0x490 fs/coredump.c:915 elf_core_dump+0x1a73/0x1b90 fs/binfmt_elf.c:2142 do_coredump+0x1029/0x1890 fs/coredump.c:764 get_signal+0xd65/0xff0 kernel/signal.c:2862 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:310 irqentry_exit+0x12/0x40 kernel/entry/common.c:413 exc_general_protection+0x339/0x4c0 arch/x86/kernel/traps.c:728 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 value changed: 0x00000000 -> 0x00000002 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 26532 Comm: syz-executor.1 Tainted: G W 6.4.0-syzkaller-01224-g1ef6663a587b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ================================================================== ================================================================== BUG: KCSAN: data-race in detach_buf_split / virtqueue_add read to 0xffff888101913e2c of 4 bytes by task 26614 on cpu 0: virtqueue_add_split drivers/virtio/virtio_ring.c:575 [inline] virtqueue_add+0x75a/0x20e0 drivers/virtio/virtio_ring.c:2133 virtqueue_add_inbuf+0x53/0x80 drivers/virtio/virtio_ring.c:2212 request_entropy drivers/char/hw_random/virtio-rng.c:61 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1c5/0x3f0 drivers/char/hw_random/virtio-rng.c:92 rng_get_data drivers/char/hw_random/core.c:197 [inline] rng_dev_read+0x1a7/0x5e0 drivers/char/hw_random/core.c:234 vfs_read+0x19f/0x5c0 fs/read_write.c:468 ksys_read+0xeb/0x1a0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __x64_sys_read+0x42/0x50 fs/read_write.c:621 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read-write to 0xffff888101913e2c of 4 bytes by interrupt on cpu 1: detach_buf_split+0x316/0x570 drivers/virtio/virtio_ring.c:760 virtqueue_get_buf_ctx_split drivers/virtio/virtio_ring.c:835 [inline] virtqueue_get_buf_ctx+0x3c2/0x5b0 drivers/virtio/virtio_ring.c:2327 virtqueue_get_buf+0x1f/0x30 drivers/virtio/virtio_ring.c:2333 random_recv_done+0x4c/0x90 drivers/char/hw_random/virtio-rng.c:42 vring_interrupt+0x150/0x170 drivers/virtio/virtio_ring.c:2501 __handle_irq_event_percpu+0x91/0x490 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210 handle_edge_irq+0x167/0x590 kernel/irq/chip.c:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0x3c/0xb0 arch/x86/kernel/irq.c:257 common_interrupt+0x3d/0x90 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 __sanitizer_cov_trace_const_cmp8+0x0/0x80 kernel/kcov.c:306 pie_calculate_probability+0x19e/0x520 net/sched/sch_pie.c:345 fq_pie_timer+0xbc/0x150 net/sched/sch_fq_pie.c:387 call_timer_fn+0x35/0x290 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x46c/0x650 kernel/time/timer.c:2022 run_timer_softirq+0x1d/0x40 kernel/time/timer.c:2035 __do_softirq+0xc1/0x265 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0x3b/0x90 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x6d/0x80 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 kmem_cache_free+0x18b/0x280 free_buffer_head+0x49/0x1d0 fs/buffer.c:2988 try_to_free_buffers+0x130/0x180 fs/buffer.c:2929 jbd2_journal_try_to_free_buffers+0x1b0/0x1d0 fs/jbd2/transaction.c:2196 ext4_release_folio+0x9d/0x190 fs/ext4/inode.c:3175 filemap_release_folio+0xa4/0xe0 mm/filemap.c:4141 block_invalidate_folio+0x381/0x3c0 fs/buffer.c:1589 ext4_invalidate_folio+0x73/0x150 fs/ext4/inode.c:3138 folio_invalidate mm/truncate.c:159 [inline] truncate_cleanup_folio mm/truncate.c:179 [inline] truncate_inode_pages_range+0x29f/0x800 mm/truncate.c:368 truncate_inode_pages mm/truncate.c:449 [inline] truncate_inode_pages_final+0x58/0x60 mm/truncate.c:484 ext4_evict_inode+0x174/0xdc0 fs/ext4/inode.c:193 evict+0x1aa/0x410 fs/inode.c:665 iput_final fs/inode.c:1789 [inline] iput+0x42c/0x5b0 fs/inode.c:1815 dentry_unlink_inode+0x22a/0x240 fs/dcache.c:401 __dentry_kill+0x2db/0x4a0 fs/dcache.c:607 dentry_kill+0x8d/0x1e0 dput+0x118/0x1f0 fs/dcache.c:913 __fput+0x475/0x600 fs/file_table.c:386 ____fput+0x15/0x20 fs/file_table.c:406 task_work_run+0x135/0x1a0 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x5ff/0x1670 kernel/exit.c:874 do_group_exit+0x101/0x150 kernel/exit.c:1024 get_signal+0xeb7/0xff0 kernel/signal.c:2876 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:308 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:310 irqentry_exit+0x12/0x40 kernel/entry/common.c:413 exc_general_protection+0x339/0x4c0 arch/x86/kernel/traps.c:728 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 value changed: 0x000000ff -> 0x000000fe Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 26490 Comm: syz-executor.1 Tainted: G W 6.4.0-syzkaller-01224-g1ef6663a587b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ==================================================================