8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6158 Comm: syz.2.525 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<8139f1c0>] lr : [<8139f1ac>] psr: 60000013 sp : e0365cc0 ip : e0365cc0 fp : e0365cdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 8408a300 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8408a300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85578680 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8408a300 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8408a300 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: non-paged memory Register r9 information: NULL pointer Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xe0364000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xe0364000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.2.525 (pid: 6158, stack limit = 0xe0364000) Stack: (0xe0365cc0 to 0xe0366000) 5cc0: 8139f160 8408a300 00004f27 00004f27 e0365cfc e0365ce0 8139ee98 8139f16c 5ce0: 00004f27 80500f38 85a06000 85a06000 e0365d1c e0365d00 8139f258 8139ee4c 5d00: 85a06000 8408a300 e0365dac 00004f27 e0365d5c e0365d20 8139f44c 8139f1d8 5d20: 20000013 83ba8f00 82822670 00000000 00000000 829c53b0 8408a300 00000000 5d40: e0365d98 8408a300 00000000 82b14ef8 e0365d94 e0365d60 8138e35c 8139f39c 5d60: 200000c0 00000000 e0365d84 200000c0 8408a300 b5403587 200000c0 84e0d400 5d80: 40946400 00000003 e0365e4c e0365d98 81389f28 8138e264 35353238 00000000 5da0: 00000000 00000000 00000000 00004f27 00000005 00000007 00000401 00000004 5dc0: 00000cc7 00000008 5c952397 00000005 00000400 00000002 00000300 00000000 5de0: 00000001 00000009 0000e1cb 00000000 00000004 00000003 000001ff 80000089 5e00: fffffffd 00000000 20001e56 ffffeadb 00000003 0000003d 00000008 00000004 5e20: 08000000 dffffffa 00000000 ebb5485e 00000000 85d34600 8408a300 200000c0 5e40: e0365f14 e0365e50 8138aedc 81389e5c 00000000 00000000 00000000 ebb5485e 5e60: 00000000 00000000 824693fc 0000005f 83d12658 8408a330 841b112c 84e0d400 5e80: e0365ee4 e0365e90 8078f7e4 80785ad4 00000064 00000001 00000000 e0365eac 5ea0: 8493dcd0 834ef440 00006400 0000000b e0365ea0 00000000 00000000 ebb5485e 5ec0: 85d34600 40946400 200000c0 200000c0 00000003 85d34600 e0365ef4 e0365ee8 5ee0: 8078f904 ebb5485e e0365f14 40946400 00000000 85d34601 200000c0 00000003 5f00: 85d34600 84e0d400 e0365fa4 e0365f18 805679ec 8138a90c ecac8b10 84e0d400 5f20: e0365f3c e0365f30 81a24aec 81a249bc e0365f54 e0365f40 80261ffc 802935b0 5f40: e0365fb0 40000000 e0365f84 e0365f58 802229ec 80261fb8 00000000 8281d09c 5f60: e0365fb0 0014c520 ecac8b10 80222940 00000000 ebb5485e e0365fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 84e0d400 00000036 00000000 e0365fa8 5fa0: 80200060 805678c8 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bb70bc 5fe0: 76bb6ec0 76bb6eb0 000193a4 00131fc0 60000010 00000003 00000000 00000000 Call trace: [<8139f160>] (subdev_8255_io) from [<8139ee98>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8408a300 r4:8139f160 [<8139ee40>] (subdev_8255_do_config) from [<8139f258>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8139ee40>] (subdev_8255_do_config) from [<8139f258>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85a06000 [<8139f1cc>] (subdev_8255_io_init) from [<8139f44c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<8139f1cc>] (subdev_8255_io_init) from [<8139f44c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:e0365dac r5:8408a300 r4:85a06000 [<8139f390>] (dev_8255_attach) from [<8138e35c>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:999) r10:82b14ef8 r9:00000000 r8:8408a300 r7:e0365d98 r6:00000000 r5:8408a300 r4:829c53b0 [<8138e258>] (comedi_device_attach) from [<81389f28>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84e0d400 r7:200000c0 r6:b5403587 r5:8408a300 r4:200000c0 [<81389e50>] (do_devconfig_ioctl) from [<8138aedc>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2156) r6:200000c0 r5:8408a300 r4:85d34600 [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<8138a900>] (comedi_unlocked_ioctl) from [<805679ec>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:84e0d400 r9:85d34600 r8:00000003 r7:200000c0 r6:85d34601 r5:00000000 r4:40946400 [<805678bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0365fa8 to 0xe0365ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bb70bc 5fe0: 76bb6ec0 76bb6eb0 000193a4 00131fc0 r10:00000036 r9:84e0d400 r8:8020029c r7:00000036 r6:002f6300 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction