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: 6445 Comm: syz.0.656 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: 60000113 sp : df911cc0 ip : df911cc0 fp : df911cdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 8417d240 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 8417d240 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86156fc0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8417d240 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 8417d240 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 0xdf910000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdf910000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.656 (pid: 6445, stack limit = 0xdf910000) Stack: (0xdf911cc0 to 0xdf912000) 1cc0: 813a5440 8417d240 00002166 00002166 df911cfc df911ce0 813a5178 813a544c 1ce0: 00002166 80507828 85865884 85865884 df911d1c df911d00 813a5538 813a512c 1d00: 85865884 8417d240 df911db0 00002166 df911d5c df911d20 813a572c 813a54b8 1d20: 00000013 83bb7280 82822670 00000000 00000000 829c53f0 8417d240 00000000 1d40: df911d98 8417d240 00000000 82b15078 df911d94 df911d60 81394650 813a567c 1d60: 200004c0 00000000 df911d84 200004c0 8417d240 b5403587 200004c0 8561bc00 1d80: 40946400 00000001 df911e4c df911d98 813902e0 81394558 35353238 00000000 1da0: 00000000 00000000 00000000 fffffffb 00002166 00000003 000000b2 000088d7 1dc0: 0000008f 00000000 00001010 00000002 00000008 00000000 0000000b 00000344 1de0: 00000001 00000002 00000001 00000009 00000003 00000006 0000000e 00000004 1e00: 00000000 00000009 000007ff 00000004 00000005 0100b0c4 000007df 00000008 1e20: 000000f3 00000001 00000000 7f30b574 00000000 84d986c0 8417d240 200004c0 1e40: df911f14 df911e50 81391294 81390214 00000000 00000000 00000000 7f30b574 1e60: 00000000 00000000 8246a3fc 0000005f 83d35258 8417d270 83d96bdc 8561bc00 1e80: df911ee4 df911e90 80795d2c 8078c01c 00000064 00000001 00000000 df911eac 1ea0: 8580db50 834356e8 00006400 0000000b df911ea0 00000000 00000000 7f30b574 1ec0: 84d986c0 40946400 200004c0 200004c0 00000003 84d986c0 df911ef4 df911ee8 1ee0: 80795e4c 7f30b574 df911f14 40946400 00000000 84d986c1 200004c0 00000003 1f00: 84d986c0 8561bc00 df911fa4 df911f18 8056e2cc 81390cc4 ecac8b10 8561bc00 1f20: df911f3c df911f30 81a2db6c 81a2da3c df911f54 df911f40 80261ffc 80293598 1f40: df911fb0 40000000 df911f84 df911f58 802229ec 80261fb8 00000000 8281d09c 1f60: df911fb0 0014c520 ecac8b10 80222940 00000000 7f30b574 df911fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 8561bc00 00000036 00000000 df911fa8 1fa0: 80200060 8056e1a8 00000000 00000000 00000003 40946400 200004c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc20bc 1fe0: 76bc1ec0 76bc1eb0 000193a4 00131fc0 60000010 00000003 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 r5:8417d240 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) r4:85865884 [<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:df911db0 r5:8417d240 r4:85865884 [<813a5670>] (dev_8255_attach) from [<81394650>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:8417d240 r7:df911d98 r6:00000000 r5:8417d240 r4:829c53f0 [<8139454c>] (comedi_device_attach) from [<813902e0>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000001 r9:40946400 r8:8561bc00 r7:200004c0 r6:b5403587 r5:8417d240 r4:200004c0 [<81390208>] (do_devconfig_ioctl) from [<81391294>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200004c0 r5:8417d240 r4:84d986c0 [<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) r10:8561bc00 r9:84d986c0 r8:00000003 r7:200004c0 r6:84d986c1 r5:00000000 r4:40946400 [<8056e19c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf911fa8 to 0xdf911ff0) 1fa0: 00000000 00000000 00000003 40946400 200004c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc20bc 1fe0: 76bc1ec0 76bc1eb0 000193a4 00131fc0 r10:00000036 r9:8561bc00 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