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: 0 UID: 0 PID: 6098 Comm: syz.8.7343 Not tainted 6.16.0-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 : dfaf1cc0 ip : dfaf1cc0 fp : dfaf1cdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 84105300 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84105300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8491f0c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84105300 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 84105300 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 0xdfaf0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfaf0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.8.7343 (pid: 6098, stack limit = 0xdfaf0000) Stack: (0xdfaf1cc0 to 0xdfaf2000) 1cc0: 8139f160 84105300 00004f27 00004f27 dfaf1cfc dfaf1ce0 8139ee98 8139f16c 1ce0: 00004f27 80500f38 83a56000 83a56000 dfaf1d1c dfaf1d00 8139f258 8139ee4c 1d00: 83a56000 84105300 dfaf1dac 00004f27 dfaf1d5c dfaf1d20 8139f44c 8139f1d8 1d20: 20000013 84fb2a00 82822670 00000000 00000000 829c53b0 84105300 00000000 1d40: dfaf1d98 84105300 00000000 82b14ef8 dfaf1d94 dfaf1d60 8138e35c 8139f39c 1d60: 200000c0 00000000 dfaf1d84 200000c0 84105300 b5403587 200000c0 84c14800 1d80: 40946400 00000003 dfaf1e4c dfaf1d98 81389f28 8138e264 35353238 00000000 1da0: 00000000 00000000 00000000 00004f27 00000005 00000002 00000401 00000001 1dc0: 00000cc7 00000fff 5c952399 00000005 000003ff 00000802 00001600 00000001 1de0: 00000001 00000009 0000e1cb 00000006 00000004 00000003 00000395 80000089 1e00: fffffffd 00000000 fffffff5 ffffeadb 00000003 0000003c 00000008 00000004 1e20: 08000000 dffffffa 00000000 8ceb10f9 00000000 84ead300 84105300 200000c0 1e40: dfaf1f14 dfaf1e50 8138aedc 81389e5c 00000000 00000000 00000000 8ceb10f9 1e60: 00000000 00000000 824693fc 0000005f 8402ae58 84105330 8410c3fc 84c14800 1e80: dfaf1ee4 dfaf1e90 8078f7e4 80785ad4 00000064 00000001 00000000 dfaf1eac 1ea0: 876beb50 83428908 00006400 0000000b dfaf1ea0 00000000 00000000 8ceb10f9 1ec0: 84ead300 40946400 200000c0 200000c0 00000003 84ead300 dfaf1ef4 dfaf1ee8 1ee0: 8078f904 8ceb10f9 dfaf1f14 40946400 00000000 84ead301 200000c0 00000003 1f00: 84ead300 84c14800 dfaf1fa4 dfaf1f18 805679ec 8138a90c ecac8b10 84c14800 1f20: dfaf1f3c dfaf1f30 81a24aec 81a249bc dfaf1f54 dfaf1f40 80261ffc 802935b0 1f40: dfaf1fb0 40000000 dfaf1f84 dfaf1f58 802229ec 80261fb8 00000000 8281d09c 1f60: dfaf1fb0 0014c520 ecac8b10 80222940 00000000 8ceb10f9 dfaf1fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 84c14800 00000036 00000000 dfaf1fa8 1fa0: 80200060 805678c8 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b8d0bc 1fe0: 76b8cec0 76b8ceb0 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 r5:84105300 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) r4:83a56000 [<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:dfaf1dac r5:84105300 r4:83a56000 [<8139f390>] (dev_8255_attach) from [<8138e35c>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:999) r10:82b14ef8 r9:00000000 r8:84105300 r7:dfaf1d98 r6:00000000 r5:84105300 r4:829c53b0 [<8138e258>] (comedi_device_attach) from [<81389f28>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84c14800 r7:200000c0 r6:b5403587 r5:84105300 r4:200000c0 [<81389e50>] (do_devconfig_ioctl) from [<8138aedc>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2156) r6:200000c0 r5:84105300 r4:84ead300 [<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) r10:84c14800 r9:84ead300 r8:00000003 r7:200000c0 r6:84ead301 r5:00000000 r4:40946400 [<805678bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaf1fa8 to 0xdfaf1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b8d0bc 1fe0: 76b8cec0 76b8ceb0 000193a4 00131fc0 r10:00000036 r9:84c14800 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