Do you see kernel WARNING while running bpf: test_sock test case ? This kernel warning is popping up continuously for ~725 times on all devices ( arm64, arm, x86_64 and i386).

selftests: bpf: test_sock Test case: bind4 load with invalid access: src_ip6 .. [PASS] Test case: bind4 load with invalid access: mark .. [PASS] Test case: bind6 load with invalid access: src_ip4 .. [PASS] Test case: sock_create load with invalid access: src_port .. [PASS] Test case: sock_create load w/o expected_attach_type (compat mode) .. [PASS] Test case: sock_create load w/ expected_attach_type .. [PASS] Test case: attach type mismatch bind4 vs bind6 .. [PASS] Test case: attach type mismatch bind6 vs bind4 .. [PASS] Test case: attach type mismatch default vs bind4 .. [PASS] Test case: attach type mismatch bind6 vs sock_create .. [PASS] Test case: bind4 reject all .. [PASS] Test case: bind6 reject all .. [PASS] Test case: bind6 deny specific IP & port .. [PASS] Test case: bind4 allow specific IP & port .. [PASS] Test case: bind4 allow all .. [PASS] Test case: bind6 allow all .. [PASS] Summ[ 200.359313] WARNING: CPU: 1 PID: 3400 at /usr/src/kernel/kernel/workqueue.c:3030 __flush_work+0x3fc/0x470 [ 200.369390] Modules linked in: tun algif_hash af_alg x86_pkg_temp_thermal fuse [ 200.376621] CPU: 1 PID: 3400 Comm: kworker/1:156 Not tainted 5.1.0 #1 [ 200.383061] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS 2.2 05/23/2018 [ 200.390455] Workqueue: events sk_psock_destroy_deferred [ 200.395679] RIP: 0010:__flush_work+0x3fc/0x470 [ 200.400123] Code: 03 00 31 c0 e9 a4 fe ff ff 41 8b 0c 24 49 8b 54 24 08 83 e1 08 49 0f ba 2c 24 03 80 c9 f0 e9 d0 fd ff ff 0f 0b e9 83 fe ff ff <0f> 0b 31 c0 e9 7a fe ff ff e8 e6 1f 06 00 84 c0 0f 85 fd fe ff ff [ 200.418859] RSP: 0018:ffffa5d68487bca0 EFLAGS: 00010246 [ 200.424079] RAX: 0000000000000000 RBX: ffff9abc19269468 RCX: 0000000000000006 [ 200.431200] RDX: 0000000000001b35 RSI: 0000000000000001 RDI: ffff9abc19269468 [ 200.438324] RBP: ffffa5d68487bd68 R08: 0000000000000000 R09: 0000000000000000 [ 200.445449] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9abc19269468 [ 200.452572] R13: 0000000000000001 R14: ffffa5d68487bd98 R15: ffffffffabe91000 [ 200.459696] FS: 0000000000000000(0000) GS:ffff9abc6f880000(0000) knlGS:0000000000000000 [ 200.467776] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 200.473521] CR2: 00007f6c3ebf3cb0 CR3: 00000001d920a006 CR4: 00000000003606e0 [ 200.480644] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 200.487768] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 200.494891] Call Trace: [ 200.497338] ? get_work_pool+0x90/0x90 [ 200.501090] ? mark_held_locks+0x4d/0x80 [ 200.505015] ? __cancel_work_timer+0x11a/0x1d0 [ 200.509452] ? cancel_delayed_work_sync+0x13/0x20 [ 200.514151] ? lockdep_hardirqs_on+0xf6/0x190 [ 200.518509] ? __cancel_work_timer+0x11a/0x1d0 [ 200.522946] ? get_work_pool+0x90/0x90 [ 200.526691] __cancel_work_timer+0x134/0x1d0 [ 200.530965] cancel_delayed_work_sync+0x13/0x20 [ 200.535497] strp_done+0x1c/0x50 [ 200.538729] sk_psock_destroy_deferred+0x34/0x1c0 [ 200.543434] process_one_work+0x281/0x610 [ 200.547439] worker_thread+0x3c/0x3f0 [ 200.551105] kthread+0x12c/0x150 [ 200.554337] ? process_one_work+0x610/0x610 [ 200.558515] ? kthread_park+0x90/0x90 [ 200.562180] ret_from_fork+0x3a/0x50 [ 200.565762] irq event stamp: 2382 [ 200.569079] hardirqs last enabled at (2381): [<ffffffffabe9569a>] __cancel_work_timer+0x11a/0x1d0 [ 200.578030] hardirqs last disabled at (2382): [<ffffffffabe01b7b>] trace_hardirqs_off_thunk+0x1a/0x1c [ 200.587234] softirqs last enabled at (1806): [<fffffffface00334>] __do_softirq+0x334/0x445 [ 200.595573] softirqs last disabled at (1761): [<ffffffffabe76e70>] irq_exit+0xc0/0xd0 [ 200.603398] ---[ end trace 447ba7732b3f8640 ]---

Test full log link, https://qa-reports.linaro.org/lkft/linux-mainline-oe/build/v5.1-9822-g477823...

Best regards Naresh Kamboju