comedi comedi3: 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: 6307 Comm: syz.2.504 Not tainted 6.16.0-rc6-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 : [<813a5288>] lr : [<813a5274>] psr: 60000013 sp : dfbedcc0 ip : dfbedcc0 fp : dfbedcdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 83bfb9c0 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 83bfb9c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85acb900 DAC: fffffffd Register r0 information: slab kmalloc-192 start 83bfb9c0 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 83bfb9c0 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 0xdfbec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfbec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.2.504 (pid: 6307, stack limit = 0xdfbec000) Stack: (0xdfbedcc0 to 0xdfbee000) dcc0: 813a5228 83bfb9c0 00002166 00002166 dfbedcfc dfbedce0 813a4f60 813a5234 dce0: 00002166 80507840 863fe084 863fe084 dfbedd1c dfbedd00 813a5320 813a4f14 dd00: 863fe084 83bfb9c0 dfbeddb0 00002166 dfbedd5c dfbedd20 813a5514 813a52a0 dd20: 00000013 83894e80 82822670 00000000 00000000 829c53f0 83bfb9c0 00000000 dd40: dfbedd98 83bfb9c0 00000000 82b15078 dfbedd94 dfbedd60 81394438 813a5464 dd60: 20000140 00000000 dfbedd84 20000140 83bfb9c0 b5403587 20000140 85793000 dd80: 40946400 00000003 dfbede4c dfbedd98 813900c8 81394340 35353238 00000000 dda0: 00000000 00000000 00000000 fffffffb 00002166 00000002 00100000 000088d6 ddc0: 0000008f fffffffd 00100010 01000002 ffffffff 00000200 00000008 00000006 dde0: 00000001 00000007 00000007 00000009 00000003 00000003 00000101 00000100 de00: 00000003 00000084 00000005 0000000b 00000000 00005721 00000000 00000008 de20: 00000007 00000000 00000000 5b9612fc 00000000 84f96d80 83bfb9c0 20000140 de40: dfbedf14 dfbede50 8139107c 8138fffc 00000000 00000000 00000000 5b9612fc de60: 00000000 00000000 8246a3fc 0000005f 83f56658 83bfb9f0 841d9204 85793000 de80: dfbedee4 dfbede90 80795d44 8078c034 00000064 00000001 00000000 dfbedeac dea0: 858b2790 834e1330 00006400 0000000b dfbedea0 00000000 00000000 5b9612fc dec0: 84f96d80 40946400 20000140 20000140 00000003 84f96d80 dfbedef4 dfbedee8 dee0: 80795e64 5b9612fc dfbedf14 40946400 00000000 84f96d81 20000140 00000003 df00: 84f96d80 85793000 dfbedfa4 dfbedf18 8056e2e4 81390aac ecac8b10 85793000 df20: dfbedf3c dfbedf30 81a2d70c 81a2d5dc dfbedf54 dfbedf40 80261ffc 80293598 df40: dfbedfb0 40000000 dfbedf84 dfbedf58 802229ec 80261fb8 00000000 8281d09c df60: dfbedfb0 0014c4a0 ecac8b10 80222940 00000000 5b9612fc dfbedfac 00000000 df80: 00000000 002f6300 00000036 8020029c 85793000 00000036 00000000 dfbedfa8 dfa0: 80200060 8056e1c0 00000000 00000000 00000003 40946400 20000140 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc60bc dfe0: 76bc5ec0 76bc5eb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<813a5228>] (subdev_8255_io) from [<813a4f60>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00002166 r6:00002166 r5:83bfb9c0 r4:813a5228 [<813a4f08>] (subdev_8255_do_config) from [<813a5320>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a4f08>] (subdev_8255_do_config) from [<813a5320>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:863fe084 [<813a5294>] (subdev_8255_io_init) from [<813a5514>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a5294>] (subdev_8255_io_init) from [<813a5514>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00002166 r6:dfbeddb0 r5:83bfb9c0 r4:863fe084 [<813a5458>] (dev_8255_attach) from [<81394438>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:83bfb9c0 r7:dfbedd98 r6:00000000 r5:83bfb9c0 r4:829c53f0 [<81394334>] (comedi_device_attach) from [<813900c8>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:85793000 r7:20000140 r6:b5403587 r5:83bfb9c0 r4:20000140 [<8138fff0>] (do_devconfig_ioctl) from [<8139107c>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:83bfb9c0 r4:84f96d80 [<81390aa0>] (comedi_unlocked_ioctl) from [<8056e2e4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390aa0>] (comedi_unlocked_ioctl) from [<8056e2e4>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390aa0>] (comedi_unlocked_ioctl) from [<8056e2e4>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390aa0>] (comedi_unlocked_ioctl) from [<8056e2e4>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:85793000 r9:84f96d80 r8:00000003 r7:20000140 r6:84f96d81 r5:00000000 r4:40946400 [<8056e1b4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbedfa8 to 0xdfbedff0) dfa0: 00000000 00000000 00000003 40946400 20000140 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc60bc dfe0: 76bc5ec0 76bc5eb0 000193a4 00131f40 r10:00000036 r9:85793000 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