linux-kernel - WARNING on latest master due to DYNAMIC_PREEMPT and cond

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Message-ID: <20210225131221.11dab26e@gandalf.local.home>
Date:   Thu, 25 Feb 2021 13:12:21 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: WARNING on latest master due to DYNAMIC_PREEMPT and cond_resched()

I got this warning dump on latest master (while fixing the kmem trace event)

 ------------[ cut here ]------------
 unexpected static_call insn opcode 0xe9 at drm_gem_check_release_pagevec+0x2a/0x30 [drm]
 WARNING: CPU: 6 PID: 646 at arch/x86/kernel/static_call.c:77 __static_call_validate+0x68/0x80
 Modules linked in: drm(+) e1000e(+) crct10dif_pclmul i2c_i801 crc32_pclmul snd_seq_device crc32c_intel wmi snd_pcm serio_raw mei_me tpm_infineon i2c_smbus video mei ghash_clmulni_intel lpc_ich snd_timer snd soundcore ip_tables
 CPU: 6 PID: 646 Comm: systemd-udevd Not tainted 5.11.0-test+ #24
 Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v03.03 07/14/2016
 RIP: 0010:__static_call_validate+0x68/0x80
 Code: 05 4f 7a fc 00 75 d7 0f b6 05 4a 7a fc 00 38 47 04 75 cb c3 48 89 fa 48 c7 c7 a0 66 35 89 c6 05 cd 92 9a 01 01 e8 d7 72 b2 00 <0f> 0b c3 0f b6 4a 04 38 4f 04 75 c9 c3 c3 66 2e 0f 1f 84 00 00 00
 e1000e 0000:00:19.0 0000:00:19.0 (uninitialized): registered PHC clock
 RSP: 0018:ffffa67d0050fc30 EFLAGS: 00010286
 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff9584da800000
 RDX: 0000000000000000 RSI: ffffffff88156d6f RDI: ffffffff88156d6f
 RBP: ffffffffc0219f2a R08: 00000007e8bf25a1 R09: 0000000000000000
 R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8826c3c0
 R13: 0000000000000000 R14: ffffffffc0219f2a R15: ffffffffc0293e1b
 FS:  00007f4bd2a29940(0000) GS:ffff9584da800000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00007fd14f762f44 CR3: 00000001069ce003 CR4: 00000000001706e0
 Call Trace:
  arch_static_call_transform+0x5f/0x90
  __static_call_init.part.0+0x15f/0x210
  ? __SCT__tp_func_sched_update_nr_running_tp+0x8/0x8
  static_call_module_notify+0x6b/0x190
 e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) b4:b5:2f:ce:18:65
  notifier_call_chain_robust+0x5a/0xc0
 e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
  blocking_notifier_call_chain_robust+0x43/0x60
 e1000e 0000:00:19.0 eth0: MAC: 10, PHY: 11, PBA No: 0100FF-0FF
  load_module+0x2256/0x2ca0
  ? __kernel_read+0x152/0x2d0
  ? kernel_read_file+0x220/0x280
  ? __do_sys_finit_module+0xb1/0x110
  __do_sys_finit_module+0xb1/0x110
  do_syscall_64+0x33/0x40
  entry_SYSCALL_64_after_hwframe+0x44/0xae

It appears to be tripping up oven the static caller in cond_resched() in
that function.

Attached is my config.

-- Steve

Download attachment "config.gz" of type "application/gzip" (35174 bytes)