Hello, syzbot found the following issue on: HEAD commit: f4bc5bbb5fef Merge tag 'nfsd-5.17-2' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=149676d8700000 kernel config: https://syzkaller.appspot.com/x/.config?x=1dcc3374da7c1f7c dashboard link: https://syzkaller.appspot.com/bug?extid=9f00f7796f970f61ce79 compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9f00f7796f970f61ce79@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in random_recv_done / virtio_read write to 0xffff88810254d8cc of 4 bytes by interrupt on cpu 1: random_recv_done+0x58/0x80 drivers/char/hw_random/virtio-rng.c:45 vring_interrupt+0x15d/0x180 drivers/virtio/virtio_ring.c:2165 __handle_irq_event_percpu+0x92/0x450 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x7b/0x110 kernel/irq/handle.c:210 handle_edge_irq+0x18e/0x5f0 kernel/irq/chip.c:820 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0x60/0x100 arch/x86/kernel/irq.c:250 common_interrupt+0x9a/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 preempt_count arch/x86/include/asm/preempt.h:27 [inline] check_kcov_mode kernel/kcov.c:166 [inline] __sanitizer_cov_trace_pc+0x14/0x60 kernel/kcov.c:200 zap_pte_range+0x87d/0x10e0 mm/memory.c:1423 zap_pmd_range mm/memory.c:1490 [inline] zap_pud_range mm/memory.c:1519 [inline] zap_p4d_range mm/memory.c:1540 [inline] unmap_page_range+0x2dc/0x3d0 mm/memory.c:1561 unmap_single_vma+0x157/0x210 mm/memory.c:1606 unmap_vmas+0xd0/0x180 mm/memory.c:1638 exit_mmap+0x261/0x4b0 mm/mmap.c:3178 __mmput+0x27/0x1b0 kernel/fork.c:1114 mmput+0x3d/0x50 kernel/fork.c:1135 exit_mm+0xdb/0x170 kernel/exit.c:507 do_exit+0x569/0x16a0 kernel/exit.c:793 do_group_exit+0x8b/0x160 kernel/exit.c:935 __do_sys_exit_group+0xb/0x10 kernel/exit.c:946 __se_sys_exit_group+0x5/0x10 kernel/exit.c:944 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:944 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae write to 0xffff88810254d8cc of 4 bytes by task 30156 on cpu 0: request_entropy drivers/char/hw_random/virtio-rng.c:56 [inline] copy_data drivers/char/hw_random/virtio-rng.c:74 [inline] virtio_read+0x1a0/0x450 drivers/char/hw_random/virtio-rng.c:92 rng_get_data drivers/char/hw_random/core.c:192 [inline] rng_dev_read+0x1b4/0x630 drivers/char/hw_random/core.c:229 vfs_read+0x1e6/0x750 fs/read_write.c:479 ksys_read+0xd9/0x190 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000040 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 30156 Comm: syz-executor.0 Not tainted 5.17.0-rc3-syzkaller-00043-gf4bc5bbb5fef-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
