Hi, Jochen reported the folowing while booting 6.17.8 based kernel in Debian:
On Sat, Nov 22, 2025 at 07:19:06PM +0100, Jochen Sprickerhof wrote: > Package: src:linux > Version: 6.17.8-1 > Severity: normal > > First time booting into 6.17.8-1 and first time I see UBSAN in my logs: > > [Nov21 08:31] Booting Linux on physical CPU 0x100 > [ +0,012977] ------------[ cut here ]------------ > [ +0,000017] UBSAN: array-index-out-of-bounds in > /build/reproducible-path/linux-6.17.8/drivers/clk/samsung/clk-exynos-clkout.c:178:18 > [ +0,000038] index 0 is out of range for type 'clk_hw *[*]' > [ +0,000025] CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted > 6.17.8+deb14-armmp #1 NONE Debian 6.17.8-1 > [ +0,000018] Hardware name: Samsung Exynos (Flattened Device Tree) > [ +0,000007] Call trace: > [ +0,000009] unwind_backtrace from show_stack+0x18/0x1c > [ +0,000042] show_stack from dump_stack_lvl+0x54/0x68 > [ +0,000036] dump_stack_lvl from ubsan_epilogue+0x8/0x34 > [ +0,000025] ubsan_epilogue from __ubsan_handle_out_of_bounds+0x88/0x8c > [ +0,000024] __ubsan_handle_out_of_bounds from > exynos_clkout_probe+0x38c/0x428 > [ +0,000029] exynos_clkout_probe from platform_probe+0x64/0x98 > [ +0,000034] platform_probe from really_probe+0xd8/0x3ac > [ +0,000031] really_probe from __driver_probe_device+0x94/0x1dc > [ +0,000027] __driver_probe_device from driver_probe_device+0x3c/0xd8 > [ +0,000027] driver_probe_device from __driver_attach+0xd8/0x1d8 > [ +0,000028] __driver_attach from bus_for_each_dev+0x84/0xd4 > [ +0,000026] bus_for_each_dev from bus_add_driver+0xf4/0x218 > [ +0,000023] bus_add_driver from driver_register+0x8c/0x140 > [ +0,000027] driver_register from do_one_initcall+0x50/0x24c > [ +0,000023] do_one_initcall from kernel_init_freeable+0x288/0x2fc > [ +0,000022] kernel_init_freeable from kernel_init+0x24/0x140 > [ +0,000022] kernel_init from ret_from_fork+0x14/0x28 > [ +0,000015] Exception stack(0xf0835fb0 to 0xf0835ff8) > [ +0,000012] 5fa0: 00000000 00000000 > 00000000 00000000 > [ +0,000011] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 > [ +0,000009] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 > [ +0,000007] ---[ end trace ]--- > [ +0,000226] ------------[ cut here ]------------ > [ +0,000012] UBSAN: array-index-out-of-bounds in > /build/reproducible-path/linux-6.17.8/drivers/clk/samsung/clk-exynos-clkout.c:183:29 > [ +0,000032] index 0 is out of range for type 'clk_hw *[*]' > [ +0,000021] CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted > 6.17.8+deb14-armmp #1 NONE Debian 6.17.8-1 > [ +0,000014] Hardware name: Samsung Exynos (Flattened Device Tree) > [ +0,000006] Call trace: > [ +0,000006] unwind_backtrace from show_stack+0x18/0x1c > [ +0,000032] show_stack from dump_stack_lvl+0x54/0x68 > [ +0,000033] dump_stack_lvl from ubsan_epilogue+0x8/0x34 > [ +0,000023] ubsan_epilogue from __ubsan_handle_out_of_bounds+0x88/0x8c > [ +0,000020] __ubsan_handle_out_of_bounds from > exynos_clkout_probe+0x354/0x428 > [ +0,000024] exynos_clkout_probe from platform_probe+0x64/0x98 > [ +0,000031] platform_probe from really_probe+0xd8/0x3ac > [ +0,000031] really_probe from __driver_probe_device+0x94/0x1dc > [ +0,000031] __driver_probe_device from driver_probe_device+0x3c/0xd8 > [ +0,000028] driver_probe_device from __driver_attach+0xd8/0x1d8 > [ +0,000027] __driver_attach from bus_for_each_dev+0x84/0xd4 > [ +0,000025] bus_for_each_dev from bus_add_driver+0xf4/0x218 > [ +0,000023] bus_add_driver from driver_register+0x8c/0x140 > [ +0,000027] driver_register from do_one_initcall+0x50/0x24c > [ +0,000022] do_one_initcall from kernel_init_freeable+0x288/0x2fc > [ +0,000019] kernel_init_freeable from kernel_init+0x24/0x140 > [ +0,000020] kernel_init from ret_from_fork+0x14/0x28 > [ +0,000016] Exception stack(0xf0835fb0 to 0xf0835ff8) > [ +0,000010] 5fa0: 00000000 00000000 > 00000000 00000000 > [ +0,000009] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 > [ +0,000009] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 > [ +0,000098] ---[ end trace ]--- Can you have a look into it? The downstream report is at https://bugs.debian.org/1121211 Regards, Salvatore
