comedi comedi1: 8255: I/O port conflict (0xfffffffb,4) 8<--- cut here --- Unable to handle kernel paging request at virtual address fee02169 when write [fee02169] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 16729 Comm: syz.0.2723 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 : [<8139f128>] lr : [<8139f114>] psr: 60000013 sp : df95dcc0 ip : df95dcc0 fp : df95dcdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 83cd7900 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 83cd7900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 849fc980 DAC: fffffffd Register r0 information: slab kmalloc-192 start 83cd7900 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 83cd7900 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: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf95c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdf95c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.2723 (pid: 16729, stack limit = 0xdf95c000) Stack: (0xdf95dcc0 to 0xdf95e000) dcc0: 8139f0c8 83cd7900 00002166 00002166 df95dcfc df95dce0 8139ee00 8139f0d4 dce0: 00002166 80500f20 84c27484 84c27484 df95dd1c df95dd00 8139f1c0 8139edb4 dd00: 84c27484 83cd7900 df95ddb0 00002166 df95dd5c df95dd20 8139f3b4 8139f140 dd20: 20000013 840cf600 82822670 00000000 00000000 829c53b0 83cd7900 00000000 dd40: df95dd98 83cd7900 00000000 82b14ef8 df95dd94 df95dd60 8138e2c4 8139f304 dd60: 200004c0 00000000 df95dd84 200004c0 83cd7900 b5403587 200004c0 83fc3000 dd80: 40946400 00000001 df95de4c df95dd98 81389e90 8138e1cc 35353238 00000000 dda0: 00000000 00000000 00000000 fffffffb 00002166 00000003 000000b2 000088d7 ddc0: 0000008f 00000000 00001010 00000002 00000008 00000000 0000000b 00000344 dde0: 00000001 00000002 00000001 00000009 00000003 00000006 0000000e 00000004 de00: 00000000 00000009 000007ff 00000004 00000005 0100b0c4 000007df 00000008 de20: 000000f3 00000001 00000000 0639a447 00000000 8492bd80 83cd7900 200004c0 de40: df95df14 df95de50 8138ae44 81389dc4 00000000 00000000 00000000 0639a447 de60: 00000000 00000000 824693fc 0000005f 83bcfa58 83cd7930 840a3f84 83fc3000 de80: df95dee4 df95de90 8078f7bc 80785aac 00000064 00000001 00000000 df95deac dea0: 85c806d0 8342b660 00006400 0000000b df95dea0 00000000 00000000 0639a447 dec0: 8492bd80 40946400 200004c0 200004c0 00000003 8492bd80 df95def4 df95dee8 dee0: 8078f8dc 0639a447 df95df14 40946400 00000000 8492bd81 200004c0 00000003 df00: 8492bd80 83fc3000 df95dfa4 df95df18 805679c4 8138a874 ecac8b10 83fc3000 df20: df95df3c df95df30 81a24b4c 81a24a1c df95df54 df95df40 80261ffc 80293598 df40: df95dfb0 40000000 df95df84 df95df58 802229ec 80261fb8 00000000 8281d09c df60: df95dfb0 0014c520 ecac8b10 80222940 00000000 0639a447 df95dfac 00000000 df80: 00000000 002f6300 00000036 8020029c 83fc3000 00000036 00000000 df95dfa8 dfa0: 80200060 805678a0 00000000 00000000 00000003 40946400 200004c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b3c0bc dfe0: 76b3bec0 76b3beb0 000193a4 00131fc0 60000010 00000003 00000000 00000000 Call trace: [<8139f0c8>] (subdev_8255_io) from [<8139ee00>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00002166 r6:00002166 r5:83cd7900 r4:8139f0c8 [<8139eda8>] (subdev_8255_do_config) from [<8139f1c0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8139eda8>] (subdev_8255_do_config) from [<8139f1c0>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84c27484 [<8139f134>] (subdev_8255_io_init) from [<8139f3b4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<8139f134>] (subdev_8255_io_init) from [<8139f3b4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00002166 r6:df95ddb0 r5:83cd7900 r4:84c27484 [<8139f2f8>] (dev_8255_attach) from [<8138e2c4>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:999) r10:82b14ef8 r9:00000000 r8:83cd7900 r7:df95dd98 r6:00000000 r5:83cd7900 r4:829c53b0 [<8138e1c0>] (comedi_device_attach) from [<81389e90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000001 r9:40946400 r8:83fc3000 r7:200004c0 r6:b5403587 r5:83cd7900 r4:200004c0 [<81389db8>] (do_devconfig_ioctl) from [<8138ae44>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2156) r6:200004c0 r5:83cd7900 r4:8492bd80 [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:83fc3000 r9:8492bd80 r8:00000003 r7:200004c0 r6:8492bd81 r5:00000000 r4:40946400 [<80567894>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf95dfa8 to 0xdf95dff0) dfa0: 00000000 00000000 00000003 40946400 200004c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b3c0bc dfe0: 76b3bec0 76b3beb0 000193a4 00131fc0 r10:00000036 r9:83fc3000 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