================================================================== BUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait write to 0xffff88810d0f0418 of 8 bytes by task 8434 on cpu 1: INIT_LIST_HEAD include/linux/list.h:36 [inline] list_splice_init include/linux/list.h:483 [inline] ep_start_scan fs/eventpoll.c:615 [inline] ep_send_events fs/eventpoll.c:1641 [inline] ep_poll fs/eventpoll.c:1792 [inline] do_epoll_wait+0x4d3/0xf00 fs/eventpoll.c:2220 do_epoll_pwait fs/eventpoll.c:2254 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2267 [inline] __se_sys_epoll_pwait+0xfb/0x210 fs/eventpoll.c:2261 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2261 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810d0f0418 of 8 bytes by task 8431 on cpu 0: list_empty_careful include/linux/list.h:319 [inline] ep_events_available fs/eventpoll.c:374 [inline] ep_poll fs/eventpoll.c:1783 [inline] do_epoll_wait+0x292/0xf00 fs/eventpoll.c:2220 do_epoll_pwait fs/eventpoll.c:2254 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2267 [inline] __se_sys_epoll_pwait+0xfb/0x210 fs/eventpoll.c:2261 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2261 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: 0 PID: 8431 Comm: syz-fuzzer Not tainted 5.11.0-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: 8431 Comm: syz-fuzzer Not tainted 5.11.0-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:79 [inline] dump_stack+0x116/0x15d lib/dump_stack.c:120 panic+0x1e7/0x5fa kernel/panic.c:231 kcsan_report+0x67b/0x680 kernel/kcsan/report.c:634 kcsan_setup_watchpoint+0x47b/0x4e0 kernel/kcsan/core.c:568 list_empty_careful include/linux/list.h:319 [inline] ep_events_available fs/eventpoll.c:374 [inline] ep_poll fs/eventpoll.c:1783 [inline] do_epoll_wait+0x292/0xf00 fs/eventpoll.c:2220 do_epoll_pwait fs/eventpoll.c:2254 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2267 [inline] __se_sys_epoll_pwait+0xfb/0x210 fs/eventpoll.c:2261 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2261 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x466780 Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 RSP: 002b:00007fff385aab20 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000466780 RDX: 0000000000000080 RSI: 00007fff385aab70 RDI: 0000000000000003 RBP: 00007fff385ab170 R08: 0000000000000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000001ac0e60 R14: 000000325e7c0e7a R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..