15206 2023-09-04 11:54:05 +0000 qemumips BUG using smp_processor_id() in preemptible 2023-10-23 14:48:18 +0000 1 1 7 Build System, Metadata & Runtime OE-Core kernel 4.3 x86 Multiple RESOLVED FIXED Medium+ normal 4.3 M4 1 ross.burton bruce.ashfield bruce.ashfield paulg randy.macleod richard.purdie tom.zanussi --- --- No (bug/feature does not impact docs) oldest_to_newest 96341 0 ross.burton 2023-09-04 11:54:05 +0000 With current master, qemumips has frequent BUG alerts: [ 130.730686] BUG: using smp_processor_id() in preemptible [00000000] code: systemd/1 [ 130.738542] caller is blast_dcache32+0x40/0x190 [ 130.745908] CPU: 0 PID: 1 Comm: systemd Not tainted 6.4.11-yocto-standard #1 [ 130.753928] Stack : 0000000000000001 0000000000000000 0000000000000018 9000000004937798 [ 130.762192] 9000000004937798 90000000049378c8 0000000000000000 0000000000000000 [ 130.770458] 008fac6060240fea 0000000000014f20 9000000004937728 0000000000000000 [ 130.778826] 00000000000b61b4 0000000000000030 ffffffff80e8eed0 0000000000000004 [ 130.787111] 9000000084937577 0000000000000000 0000000000000000 ffffffff810c3b18 [ 130.795440] ffffffff811f0000 0000000000000000 ffffffff81440000 0000000000000000 [ 130.803830] 0000000000000000 0000000000000000 ffffffff809842e8 0000000000175097 [ 130.812272] 0000000000000001 9000000004934000 9000000004937790 c0000000005d9000 [ 130.820722] ffffffff8010b6fc 0000000000000000 0000000000000000 0000000000000000 [ 130.829134] 0000000000000000 0000000000000000 ffffffff8010b71c 008fac6060240fea [ 130.837649] ... [ 130.845556] Call Trace: [ 130.853432] [<ffffffff8010b71c>] show_stack+0x64/0x158 [ 130.861534] [<ffffffff80ea1790>] dump_stack_lvl+0x5c/0x7c [ 130.869565] [<ffffffff80ea29c4>] check_preemption_disabled+0x10c/0x118 [ 130.877605] [<ffffffff8012d7c8>] blast_dcache32+0x40/0x190 [ 130.885585] [<ffffffff8039f648>] __vmalloc_node_range+0x3e0/0x780 [ 130.893527] [<ffffffff8039fbbc>] vzalloc+0x6c/0x78 [ 130.901378] [<ffffffff8095d6c4>] n_tty_open+0x1c/0xb8 [ 130.909252] [<ffffffff8095f5a8>] tty_ldisc_open+0x50/0xd0 [ 130.917053] [<ffffffff80960150>] tty_ldisc_setup+0x20/0x70 [ 130.924927] [<ffffffff80958694>] tty_init_dev.part.0+0xbc/0x2c0 [ 130.932742] [<ffffffff80958da8>] tty_open+0x4b8/0x730 [ 130.940486] [<ffffffff803e6960>] chrdev_open+0xe0/0x250 [ 130.948211] [<ffffffff803da7f4>] do_dentry_open+0x274/0x520 [ 130.955960] [<ffffffff803f642c>] path_openat+0xbc4/0x10d8 [ 130.963718] [<ffffffff803f7460>] do_filp_open+0x148/0x190 [ 130.971482] [<ffffffff803dc264>] do_sys_openat2+0xcc/0x1b0 [ 130.979288] [<ffffffff803dc710>] sys_openat+0x50/0xa8 [ 130.987077] [<ffffffff80119490>] syscall_common+0x34/0x58 Kernel 6.4.11. 96342 1 ross.burton 2023-09-05 09:27:49 +0000 Ah this only happens with DEBUG_PREEMPT enabled. Did we leave that on? 96346 2 richard.purdie 2023-09-06 10:51:19 +0000 That is set, yes. 96598 3 bruce.ashfield 2023-09-28 22:02:05 +0000 This is also in 6.5, I've managed to brute force make this stop happening. Working on a better fix now. I can confirm that this isn't something that we've caused as it happens with v6.5/base as well as our branches. 96599 4 bruce.ashfield 2023-09-29 00:17:02 +0000 I have it fixed. It will be part of the upcoming 6.5 reference kernel. 96766 5 bruce.ashfield 2023-10-23 14:48:18 +0000 I fixed this in the 6.5 kernel series.