==================================================================
BUG: KCSAN: data-race in __splice_from_pipe / pipe_poll
read to 0xffff888103e7f0f8 of 4 bytes by task 7351 on cpu 1:
pipe_poll+0x84/0x1d0 fs/pipe.c:549
vfs_poll include/linux/poll.h:90 [inline]
do_select+0x7d0/0x1020 fs/select.c:534
core_sys_select+0x38b/0x520 fs/select.c:677
do_pselect fs/select.c:759 [inline]
__do_sys_pselect6 fs/select.c:784 [inline]
__se_sys_pselect6 fs/select.c:769 [inline]
__x64_sys_pselect6+0x22a/0x280 fs/select.c:769
do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
write to 0xffff888103e7f0f8 of 4 bytes by task 7356 on cpu 0:
splice_from_pipe_feed fs/splice.c:515 [inline]
__splice_from_pipe+0x3ce/0x480 fs/splice.c:624
vmsplice_to_user fs/splice.c:1272 [inline]
do_vmsplice.part.0+0x1c5/0x210 fs/splice.c:1350
do_vmsplice fs/splice.c:1344 [inline]
__do_sys_vmsplice+0x15f/0x1c0 fs/splice.c:1371
__se_sys_vmsplice fs/splice.c:1353 [inline]
__x64_sys_vmsplice+0x5e/0x80 fs/splice.c:1353
do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7356 Comm: syz-executor.1 Not tainted 5.3.0+ #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: 7356 Comm: syz-executor.1 Not tainted 5.3.0+ #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+0xf5/0x159 lib/dump_stack.c:113
panic+0x209/0x639 kernel/panic.c:219
kcsan_report.cold+0xc/0x1b kernel/kcsan/report.c:303
__kcsan_setup_watchpoint+0x3ee/0x510 kernel/kcsan/core.c:455
__tsan_write4 kernel/kcsan/kcsan.c:30 [inline]
__tsan_write4+0x32/0x40 kernel/kcsan/kcsan.c:30
splice_from_pipe_feed fs/splice.c:515 [inline]
__splice_from_pipe+0x3ce/0x480 fs/splice.c:624
vmsplice_to_user fs/splice.c:1272 [inline]
do_vmsplice.part.0+0x1c5/0x210 fs/splice.c:1350
do_vmsplice fs/splice.c:1344 [inline]
__do_sys_vmsplice+0x15f/0x1c0 fs/splice.c:1371
__se_sys_vmsplice fs/splice.c:1353 [inline]
__x64_sys_vmsplice+0x5e/0x80 fs/splice.c:1353
do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x459a59
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcd9aab4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000116
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459a59
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000005
RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd9aab56d4
R13: 00000000004c94e5 R14: 00000000004e0c68 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..