================================================================== BUG: KCSAN: data-race in do_nanosleep / mm_update_next_owner read to 0xffff88811ce6f064 of 4 bytes by task 10130 on cpu 1: mm_update_next_owner+0x373/0x5a0 kernel/exit.c:389 exit_mm kernel/exit.c:484 [inline] do_exit+0x4a4/0x18c0 kernel/exit.c:784 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 __do_sys_exit_group kernel/exit.c:906 [inline] __se_sys_exit_group kernel/exit.c:904 [inline] __x64_sys_exit_group+0x2e/0x30 kernel/exit.c:904 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88811ce6f064 of 4 bytes by task 7998 on cpu 0: freezer_count include/linux/freezer.h:121 [inline] freezable_schedule include/linux/freezer.h:173 [inline] do_nanosleep+0x14d/0x320 kernel/time/hrtimer.c:1874 hrtimer_nanosleep+0x191/0x320 kernel/time/hrtimer.c:1927 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline] __x64_sys_nanosleep+0x106/0x150 kernel/time/hrtimer.c:1948 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7998 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7998 Comm: syz-executor.4 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x11d/0x181 lib/dump_stack.c:118 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0xd kernel/kcsan/report.c:313 kcsan_setup_watchpoint+0x3fe/0x460 kernel/kcsan/core.c:416 check_access kernel/kcsan/core.c:459 [inline] __tsan_unaligned_write4+0xc7/0x110 kernel/kcsan/core.c:588 freezer_count include/linux/freezer.h:121 [inline] freezable_schedule include/linux/freezer.h:173 [inline] do_nanosleep+0x14d/0x320 kernel/time/hrtimer.c:1874 hrtimer_nanosleep+0x191/0x320 kernel/time/hrtimer.c:1927 __do_sys_nanosleep kernel/time/hrtimer.c:1961 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1948 [inline] __x64_sys_nanosleep+0x106/0x150 kernel/time/hrtimer.c:1948 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4594a0 Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 91 f4 61 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 d4 d1 fb ff c3 48 83 ec 08 e8 ea 46 00 00 RSP: 002b:00007ffccbc74fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 0000000000022482 RCX: 00000000004594a0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffccbc74ff0 RBP: 00000000000000e2 R08: 0000000000000001 R09: 0000000000d69940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005 R13: 00007ffccbc75040 R14: 0000000000022401 R15: 00007ffccbc75050 Kernel Offset: disabled Rebooting in 86400 seconds..