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: 1 UID: 0 PID: 4599 Comm: syz.0.233 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 : [<813a5208>] lr : [<813a51f4>] psr: 60000013 sp : dfe01cc0 ip : dfe01cc0 fp : dfe01cdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 840ff480 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 840ff480 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 859fa380 DAC: 00000000 Register r0 information: slab kmalloc-192 start 840ff480 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 840ff480 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 0xdfe00000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfe00000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.233 (pid: 4599, stack limit = 0xdfe00000) Stack: (0xdfe01cc0 to 0xdfe02000) 1cc0: 813a51a8 840ff480 00002166 00002166 dfe01cfc dfe01ce0 813a4ee0 813a51b4 1ce0: 00002166 80507840 84896084 84896084 dfe01d1c dfe01d00 813a52a0 813a4e94 1d00: 84896084 840ff480 dfe01db0 00002166 dfe01d5c dfe01d20 813a5494 813a5220 1d20: 20000013 83a1bc00 82822670 00000000 00000000 829c53f0 840ff480 00000000 1d40: dfe01d98 840ff480 00000000 82b15078 dfe01d94 dfe01d60 813943b8 813a53e4 1d60: 200004c0 00000000 dfe01d84 200004c0 840ff480 b5403587 200004c0 84acc800 1d80: 40946400 00000001 dfe01e4c dfe01d98 81390048 813942c0 35353238 00000000 1da0: 00000000 00000000 00000000 fffffffb 00002166 00000003 000000b2 000088d7 1dc0: 0000008f fffffffd 00000010 00000002 00000008 00000000 00000007 00000344 1de0: 00000001 00000002 00000001 00000009 00000003 00000006 0000000e 00000004 1e00: 00000000 00000009 000007ff 00000004 00000005 0000b0c4 000007df 00000008 1e20: 000000f3 00000001 00000000 bd8658a9 00000000 8589e9c0 840ff480 200004c0 1e40: dfe01f14 dfe01e50 81390ffc 8138ff7c 00000000 00000000 00000000 bd8658a9 1e60: 00000000 00000000 8246a3fc 0000005f 83d37a58 840ff4b0 83dbb2dc 84acc800 1e80: dfe01ee4 dfe01e90 80795d44 8078c034 00000064 00000001 00000000 dfe01eac 1ea0: 84e93d90 834eaf68 00006400 0000000b dfe01ea0 00000000 00000000 bd8658a9 1ec0: 8589e9c0 40946400 200004c0 200004c0 00000003 8589e9c0 dfe01ef4 dfe01ee8 1ee0: 80795e64 bd8658a9 dfe01f14 40946400 00000000 8589e9c1 200004c0 00000003 1f00: 8589e9c0 84acc800 dfe01fa4 dfe01f18 8056e2e4 81390a2c ecac8b10 84acc800 1f20: dfe01f3c dfe01f30 81a2d68c 81a2d55c dfe01f54 dfe01f40 80261ffc 80293598 1f40: dfe01fb0 40000000 dfe01f84 dfe01f58 802229ec 80261fb8 00000000 8281d09c 1f60: dfe01fb0 0014c4a0 ecac8b10 80222940 00000000 bd8658a9 dfe01fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 84acc800 00000036 00000000 dfe01fa8 1fa0: 80200060 8056e1c0 00000000 00000000 00000003 40946400 200004c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bce0bc 1fe0: 76bcdec0 76bcdeb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<813a51a8>] (subdev_8255_io) from [<813a4ee0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00002166 r6:00002166 r5:840ff480 r4:813a51a8 [<813a4e88>] (subdev_8255_do_config) from [<813a52a0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a4e88>] (subdev_8255_do_config) from [<813a52a0>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84896084 [<813a5214>] (subdev_8255_io_init) from [<813a5494>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a5214>] (subdev_8255_io_init) from [<813a5494>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00002166 r6:dfe01db0 r5:840ff480 r4:84896084 [<813a53d8>] (dev_8255_attach) from [<813943b8>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:840ff480 r7:dfe01d98 r6:00000000 r5:840ff480 r4:829c53f0 [<813942b4>] (comedi_device_attach) from [<81390048>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000001 r9:40946400 r8:84acc800 r7:200004c0 r6:b5403587 r5:840ff480 r4:200004c0 [<8138ff70>] (do_devconfig_ioctl) from [<81390ffc>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200004c0 r5:840ff480 r4:8589e9c0 [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2e4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2e4>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2e4>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2e4>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:84acc800 r9:8589e9c0 r8:00000003 r7:200004c0 r6:8589e9c1 r5:00000000 r4:40946400 [<8056e1b4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe01fa8 to 0xdfe01ff0) 1fa0: 00000000 00000000 00000003 40946400 200004c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bce0bc 1fe0: 76bcdec0 76bcdeb0 000193a4 00131f40 r10:00000036 r9:84acc800 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