Hello, syzbot found the following issue on: HEAD commit: 2ab38c17 mailmap: remove the "repo-abbrev" comment git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=130e19b4d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=38728258f37833e3 dashboard link: https://syzkaller.appspot.com/bug?extid=2b6452167d85a022bc6f compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d) 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+2b6452167d85a022bc6f@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in blk_stat_add / blk_stat_timer_fn write to 0xffffe8ffffd35c80 of 8 bytes by interrupt on cpu 0: blk_rq_stat_init block/blk-stat.c:24 [inline] blk_stat_timer_fn+0x349/0x410 block/blk-stat.c:95 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1417 expire_timers+0x116/0x260 kernel/time/timer.c:1462 __run_timers+0x338/0x3d0 kernel/time/timer.c:1731 run_timer_softirq+0x19/0x30 kernel/time/timer.c:1744 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420 sysvec_apic_timer_interrupt+0x74/0x90 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 read to 0xffffe8ffffd35c80 of 8 bytes by interrupt on cpu 1: blk_rq_stat_add block/blk-stat.c:46 [inline] blk_stat_add+0x13d/0x230 block/blk-stat.c:74 __blk_mq_end_request+0x142/0x230 block/blk-mq.c:546 scsi_end_request+0x2a6/0x470 drivers/scsi/scsi_lib.c:604 scsi_io_completion+0x104/0xfb0 drivers/scsi/scsi_lib.c:969 scsi_finish_command+0x263/0x2b0 drivers/scsi/scsi.c:214 scsi_softirq_done+0xdf/0x440 drivers/scsi/scsi_lib.c:1449 blk_done_softirq+0x145/0x190 block/blk-mq.c:588 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420 common_interrupt+0xb5/0x130 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:619 check_access kernel/kcsan/core.c:633 [inline] __tsan_read1+0x156/0x180 kernel/kcsan/core.c:839 tomoyo_get_mode security/tomoyo/util.c:1003 [inline] tomoyo_init_request_info+0xfc/0x160 security/tomoyo/util.c:1031 tomoyo_path_perm+0x8b/0x330 security/tomoyo/file.c:815 tomoyo_inode_getattr+0x18/0x20 security/tomoyo/tomoyo.c:123 security_inode_getattr+0x7f/0xd0 security/security.c:1280 vfs_getattr fs/stat.c:121 [inline] vfs_fstat+0x45/0x390 fs/stat.c:146 __do_sys_newfstat fs/stat.c:386 [inline] __se_sys_newfstat+0x35/0x240 fs/stat.c:383 __x64_sys_newfstat+0x2d/0x40 fs/stat.c:383 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 18199 Comm: modprobe Not tainted 5.11.0-rc5-syzkaller #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.
