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 e Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 3800 Comm: syz.0.4 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 : [<813a54a0>] lr : [<813a548c>] psr: 60000013 sp : dfe39cc0 ip : dfe39cc0 fp : dfe39cdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 8402ed80 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 8402ed80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 858a6c40 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8402ed80 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 8402ed80 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 0xdfe38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfe38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.4 (pid: 3800, stack limit = 0xdfe38000) Stack: (0xdfe39cc0 to 0xdfe3a000) 9cc0: 813a5440 8402ed80 00002166 00002166 dfe39cfc dfe39ce0 813a5178 813a544c 9ce0: 00002166 80507828 85103084 85103084 dfe39d1c dfe39d00 813a5538 813a512c 9d00: 85103084 8402ed80 dfe39db0 00002166 dfe39d5c dfe39d20 813a572c 813a54b8 9d20: 00000013 838b4a00 82822670 00000000 00000000 829c53f0 8402ed80 00000000 9d40: dfe39d98 8402ed80 00000000 82b15078 dfe39d94 dfe39d60 81394650 813a567c 9d60: 200004c0 00000000 dfe39d84 200004c0 8402ed80 b5403587 200004c0 833b0c00 9d80: 40946400 00000001 dfe39e4c dfe39d98 813902e0 81394558 35353238 00000000 9da0: 00000000 00000000 00000000 fffffffb 00002166 00000003 000000b2 000088d7 9dc0: 0000008f fffffffd 00001010 00000002 00000008 00000000 00000007 00000344 9de0: 00000001 00000002 00000001 00000009 00000003 00000006 0000000e 00000004 9e00: 00000000 00000009 000007ff 00000004 00000005 0000b0c4 000007df 00000008 9e20: 000000f3 00000001 00000000 d40c8f73 00000000 84dd3840 8402ed80 200004c0 9e40: dfe39f14 dfe39e50 81391294 81390214 00000000 00000000 00000000 d40c8f73 9e60: 00000000 00000000 8246a3fc 0000005f 83d4ac58 8402edb0 840d175c 833b0c00 9e80: dfe39ee4 dfe39e90 80795d2c 8078c01c 00000064 00000001 00000000 dfe39eac 9ea0: 857ad6d0 83430770 00006400 0000000b dfe39ea0 00000000 00000000 d40c8f73 9ec0: 84dd3840 40946400 200004c0 200004c0 00000005 84dd3840 dfe39ef4 dfe39ee8 9ee0: 80795e4c d40c8f73 dfe39f14 40946400 00000000 84dd3841 200004c0 00000005 9f00: 84dd3840 833b0c00 dfe39fa4 dfe39f18 8056e2cc 81390cc4 ecac8b10 833b0c00 9f20: dfe39f3c dfe39f30 81a2db6c 81a2da3c dfe39f54 dfe39f40 80261ffc 80293598 9f40: dfe39fb0 40000000 dfe39f84 dfe39f58 802229ec 80261fb8 00000000 8281d09c 9f60: dfe39fb0 0014c520 ecac8b10 80222940 00000000 d40c8f73 dfe39fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 833b0c00 00000036 00000000 dfe39fa8 9fa0: 80200060 8056e1a8 00000000 00000000 00000005 40946400 200004c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b3d0bc 9fe0: 76b3cec0 76b3ceb0 000193a4 00131fc0 60000010 00000005 00000000 00000000 Call trace: [<813a5440>] (subdev_8255_io) from [<813a5178>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00002166 r6:00002166 r5:8402ed80 r4:813a5440 [<813a5120>] (subdev_8255_do_config) from [<813a5538>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a5120>] (subdev_8255_do_config) from [<813a5538>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85103084 [<813a54ac>] (subdev_8255_io_init) from [<813a572c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a54ac>] (subdev_8255_io_init) from [<813a572c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00002166 r6:dfe39db0 r5:8402ed80 r4:85103084 [<813a5670>] (dev_8255_attach) from [<81394650>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:8402ed80 r7:dfe39d98 r6:00000000 r5:8402ed80 r4:829c53f0 [<8139454c>] (comedi_device_attach) from [<813902e0>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000001 r9:40946400 r8:833b0c00 r7:200004c0 r6:b5403587 r5:8402ed80 r4:200004c0 [<81390208>] (do_devconfig_ioctl) from [<81391294>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200004c0 r5:8402ed80 r4:84dd3840 [<81390cb8>] (comedi_unlocked_ioctl) from [<8056e2cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390cb8>] (comedi_unlocked_ioctl) from [<8056e2cc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390cb8>] (comedi_unlocked_ioctl) from [<8056e2cc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390cb8>] (comedi_unlocked_ioctl) from [<8056e2cc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:833b0c00 r9:84dd3840 r8:00000005 r7:200004c0 r6:84dd3841 r5:00000000 r4:40946400 [<8056e19c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe39fa8 to 0xdfe39ff0) 9fa0: 00000000 00000000 00000005 40946400 200004c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b3d0bc 9fe0: 76b3cec0 76b3ceb0 000193a4 00131fc0 r10:00000036 r9:833b0c00 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