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: 1 UID: 0 PID: 4608 Comm: syz.1.79 Not tainted 6.16.0-rc5-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 : [<813a4c50>] lr : [<813a4c3c>] psr: 60000013 sp : dfa19cc0 ip : dfa19cc0 fp : dfa19cdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 84089d80 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 84089d80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85b89380 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84089d80 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 84089d80 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 0xdfa18000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfa18000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.79 (pid: 4608, stack limit = 0xdfa18000) Stack: (0xdfa19cc0 to 0xdfa1a000) 9cc0: 813a4bf0 84089d80 00002166 00002166 dfa19cfc dfa19ce0 813a4928 813a4bfc 9ce0: 00002166 80507884 8557e084 8557e084 dfa19d1c dfa19d00 813a4ce8 813a48dc 9d00: 8557e084 84089d80 dfa19db0 00002166 dfa19d5c dfa19d20 813a4edc 813a4c68 9d20: 20000013 83b60f80 82822670 00000000 00000000 829c5270 84089d80 00000000 9d40: dfa19d98 84089d80 00000000 82b15078 dfa19d94 dfa19d60 81393e00 813a4e2c 9d60: 20000140 00000000 dfa19d84 20000140 84089d80 b5403587 20000140 856ac800 9d80: 40946400 00000003 dfa19e4c dfa19d98 8138fa90 81393d08 35353238 00000000 9da0: 00000000 00000000 00000000 fffffffb 00002166 00000002 00100000 000088d6 9dc0: 0000008f fffffffd 00000010 00000002 ffffffff 00000200 00000fff 00000344 9de0: 00000001 00000002 00000200 00000009 00000000 00000003 0000000e 00000004 9e00: 00000000 00000080 000007ff 00000001 00000001 00000004 000007df 00000008 9e20: 000000f3 00000001 00000000 ace6cbbf 00000000 84849b40 84089d80 20000140 9e40: dfa19f14 dfa19e50 81390a44 8138f9c4 00000000 00000000 00000000 ace6cbbf 9e60: 00000000 00000000 8246a3fc 0000005f 83d83a58 84089db0 83fd4e64 856ac800 9e80: dfa19ee4 dfa19e90 80795a0c 8078bcfc 00000064 00000001 00000000 dfa19eac 9ea0: 859679d0 834d6bb0 00006400 0000000b dfa19ea0 00000000 00000000 ace6cbbf 9ec0: 84849b40 40946400 20000140 20000140 00000003 84849b40 dfa19ef4 dfa19ee8 9ee0: 80795b2c ace6cbbf dfa19f14 40946400 00000000 84849b41 20000140 00000003 9f00: 84849b40 856ac800 dfa19fa4 dfa19f18 8056e2dc 81390474 ecac8b10 856ac800 9f20: dfa19f3c dfa19f30 81a2cd48 81a2cc18 dfa19f54 dfa19f40 80261ffc 80293598 9f40: dfa19fb0 40000000 dfa19f84 dfa19f58 802229ec 80261fb8 00000000 8281d09c 9f60: dfa19fb0 0014c4a0 ecac8b10 80222940 00000000 ace6cbbf dfa19fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 856ac800 00000036 00000000 dfa19fa8 9fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b0f0bc 9fe0: 76b0eec0 76b0eeb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<813a4bf0>] (subdev_8255_io) from [<813a4928>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00002166 r6:00002166 r5:84089d80 r4:813a4bf0 [<813a48d0>] (subdev_8255_do_config) from [<813a4ce8>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a48d0>] (subdev_8255_do_config) from [<813a4ce8>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8557e084 [<813a4c5c>] (subdev_8255_io_init) from [<813a4edc>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a4c5c>] (subdev_8255_io_init) from [<813a4edc>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00002166 r6:dfa19db0 r5:84089d80 r4:8557e084 [<813a4e20>] (dev_8255_attach) from [<81393e00>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:84089d80 r7:dfa19d98 r6:00000000 r5:84089d80 r4:829c5270 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:856ac800 r7:20000140 r6:b5403587 r5:84089d80 r4:20000140 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:84089d80 r4:84849b40 [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:856ac800 r9:84849b40 r8:00000003 r7:20000140 r6:84849b41 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa19fa8 to 0xdfa19ff0) 9fa0: 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b0f0bc 9fe0: 76b0eec0 76b0eeb0 000193a4 00131f40 r10:00000036 r9:856ac800 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