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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org On Tue, Dec 09, 2025 at 04:36:30PM +0100, Louis Sautier wrote: > On 12/9/25 13:48, Alexandre Belloni wrote: > > > > On 09/12/2025 12:37:12+0100, Louis Sautier wrote: > > > On 12/8/25 21:58, Alexandre Belloni wrote: > > > > Hello Louis, > > > > > > > > On 02/12/2025 21:17:31+0100, Louis Sautier wrote: > > > > > Hello, > > > > > > > > > > I'm running into a bug when loading the dw-i3c-master module on k= ernel 6.18 > > > > > on one specific server. I suspect it has to do with the large num= ber of > > > > > CPUs=A0on the machine=A0(768 threads, from 2 AMD EPYC 9965 proces= sors) but I am > > > > > not sure. > > > > > > > > > > The system is on Ubuntu 25.10 and a 6.18 kernel with https://gist= .githubusercontent.com/sbraz/a6f37fafbcf9354bbe4eace9e9eb48cb/raw/115da594d= c9d7ea99b06754847571e6fd76d9da5/config > > > > > (basically Ubuntu's). > > > > Just to be sure, does this also happen with v6.17? > > > > > > > > The only change is the shutdown handling so I would guess yes. > > > > > > > Hello, > > > > > > It does happen with 6.17. I initially discovered this while running U= buntu > > > 25.10's stock kernel (6.17.0). > > > > > > > What is the behavior when you build the dw-i3c-master as a static d= river? > > > I'll try CONFIG_DW_I3C_MASTER=3Dy and report back. > > > > > > Someone also suggested (they didn't reply to the list though) that I = add a > > > printk to see what the value of maxdevs is. I'll provide the log as s= oon as > > > I have rebuilt with: > > > > > > --- linux-6.18.orig/drivers/i3c/master/dw-i3c-master.c 2025-11-30 22:= 42:10.000000000 +0000 > > > +++ linux-6.18/drivers/i3c/master/dw-i3c-master.c 2025-12-08 18:17:33= .151567225 +0000 > > > @@ -1588,6 +1588,7 @@ > > > ret =3D readl(master->regs + DEVICE_ADDR_TABLE_POINTER); > > > master->datstartaddr =3D ret; > > > master->maxdevs =3D ret >> 16; > > > + printk("maxdevs: %d\n", master->maxdevs); > > > master->free_pos =3D GENMASK(master->maxdevs - 1, 0); > > > master->quirks =3D (unsigned long)device_get_match_data(&pdev->dev= ); > > > > > Yes, that was going to be my suggestion. > > > I haven't tried with the driver built-in yet. This is what the printk sho= ws: > dw-i3c-master AMDI0015:00: probe with driver dw-i3c-master failed with er= ror > -110 > maxdevs: 65535 Maybe ret is bigger 0x8000_0000, and ret is sign int. so >>16 because -1. unsigned int val =3D readl(master->regs + DEVICE_ADDR_TABLE_POINTER); master->maxdevs =3D val >> 16; Frank > dw-i3c-master AMDI0015:01: probe with driver dw-i3c-master failed with er= ror > -110 > maxdevs: 11 > ------------[ cut here ]------------ > UBSAN: shift-out-of-bounds in drivers/i3c/master/dw-i3c-master.c:885:12 > shift exponent 64 is too large for 64-bit type 'long unsigned int' > CPU: 0 UID: 0 PID: 7363 Comm: (udev-worker) Not tainted 6.18.0 #1 > PREEMPT(voluntary) > Hardware name: Giga Computing MZ73-LM2-000/MZ73-LM2-000, BIOS R23_F43 > 11/28/2025 > Call Trace: > =A0 > =A0dump_stack_lvl+0x5f/0x90 > =A0dump_stack+0x10/0x18 > =A0ubsan_epilogue+0x9/0x39 > =A0__ubsan_handle_shift_out_of_bounds.cold+0xdd/0x1c9 > =A0dw_i3c_master_daa.cold+0x1a/0x90 [dw_i3c_master] > =A0i3c_master_do_daa+0x30/0x90 [i3c] > =A0i3c_master_register+0x616/0xa80 [i3c] > =A0dw_i3c_common_probe+0x298/0x2d0 [dw_i3c_master] > =A0dw_i3c_probe+0x30/0x50 [dw_i3c_master] > =A0platform_probe+0x42/0xc0 > =A0? driver_sysfs_add+0x63/0xd0 > =A0really_probe+0xf9/0x370 > =A0? pm_runtime_barrier+0x56/0xa0 > =A0__driver_probe_device+0x8b/0x160 > =A0driver_probe_device+0x24/0xd0 > =A0? __pfx___driver_attach+0x10/0x10 > =A0__driver_attach+0xef/0x220 > =A0? __pfx_dw_i3c_driver_init+0x10/0x10 [dw_i3c_master] > =A0bus_for_each_dev+0x8a/0xe0 > =A0driver_attach+0x1e/0x30 > =A0bus_add_driver+0x13e/0x230 > =A0? __pfx_dw_i3c_driver_init+0x10/0x10 [dw_i3c_master] > =A0driver_register+0x75/0xf0 > =A0__platform_driver_register+0x1e/0x30 > =A0dw_i3c_driver_init+0x1c/0xff0 [dw_i3c_master] > =A0do_one_initcall+0x59/0x330 > =A0do_init_module+0x8b/0x290 > =A0load_module+0x1f2f/0x2320 > =A0init_module_from_file+0x9b/0x100 > =A0? init_module_from_file+0x9b/0x100 > =A0idempotent_init_module+0x10e/0x300 > =A0__x64_sys_finit_module+0x73/0xf0 > =A0? __secure_computing+0x84/0xe0 > =A0x64_sys_call+0x1f04/0x2350 > =A0do_syscall_64+0x82/0xc80 > =A0? vfs_read+0x179/0x3a0 > =A0? vfs_read+0x179/0x3a0 > =A0? __rseq_handle_notify_resume+0xa2/0x4e0 > =A0? exit_to_user_mode_loop+0xe6/0x190 > =A0? do_syscall_64+0x25c/0xc80 > =A0? irqentry_exit+0x43/0x50 > =A0? exc_page_fault+0x90/0x1b0 > =A0entry_SYSCALL_64_after_hwframe+0x76/0x7e > RIP: 0033:0x70c8bf1348cd > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 > 73 01 c3 48 8b 0d 13 f5 0f 00 f7 d8 64 89 01 48 > RSP: 002b:00007ffd8d0e4cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 > RAX: ffffffffffffffda RBX: 000059c987bf15c0 RCX: 000070c8bf1348cd > RDX: 0000000000000000 RSI: 000070c8be74b336 RDI: 0000000000000065 > RBP: 00007ffd8d0e4d90 R08: 0000000000000000 R09: 000059c987bc1070 > R10: 0000000000000000 R11: 0000000000000246 R12: 000070c8be74b336 > R13: 0000000000020000 R14: 000059c987be8cd0 R15: 000059c987bb1440 > =A0 > ---[ end trace ]--- > maxdevs: 11 > dw-i3c-master AMDI0015:03: probe with driver dw-i3c-master failed with er= ror > -110 > > > -- > linux-i3c mailing list > linux-i3c@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-i3c -- = linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c