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: 11271 Comm: syz.4.278 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 : [<813a4cc8>] lr : [<813a4cb4>] psr: 60000013 sp : eb3c9cc0 ip : eb3c9cc0 fp : eb3c9cdc r10: 00000001 r9 : 00000000 r8 : 00000084 r7 : 00002166 r6 : 0000009b r5 : 841ca780 r4 : 00002169 r3 : 0000009b r2 : fee02169 r1 : 00000001 r0 : 841ca780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85c9af00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 841ca780 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 841ca780 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 0xeb3c8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xeb3c8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.4.278 (pid: 11271, stack limit = 0xeb3c8000) Stack: (0xeb3c9cc0 to 0xeb3ca000) 9cc0: 813a4c68 841ca780 00002166 00002166 eb3c9cfc eb3c9ce0 813a49a0 813a4c74 9ce0: 00002166 80507874 85429084 85429084 eb3c9d1c eb3c9d00 813a4d60 813a4954 9d00: 85429084 841ca780 eb3c9db0 00002166 eb3c9d5c eb3c9d20 813a4f54 813a4ce0 9d20: 00000013 849fb300 82822670 00000000 00000000 829c53f0 841ca780 00000000 9d40: eb3c9d98 841ca780 00000000 82b15078 eb3c9d94 eb3c9d60 81393e78 813a4ea4 9d60: 20000140 00000000 eb3c9d84 20000140 841ca780 b5403587 20000140 84c5a400 9d80: 40946400 00000003 eb3c9e4c eb3c9d98 8138fb08 81393d80 35353238 00000000 9da0: 00000000 00000000 00000000 fffffffb 00002166 00000002 00100003 000088d6 9dc0: 0000008f fffffffd 00000010 00000002 ffffffdf 00000200 00000fff 00000344 9de0: 00000005 00000002 00000200 00000009 00000003 00000003 0000000e 00000004 9e00: 00000401 00000080 000007ff 00000001 00000001 0000b0c2 000007df 00000008 9e20: 000000f3 80000001 00000000 e0a1f9cd 00000000 84fa5600 841ca780 20000140 9e40: eb3c9f14 eb3c9e50 81390abc 8138fa3c 00000000 00000000 00000000 e0a1f9cd 9e60: 00000000 00000000 8246a3fc 0000005f 83d8ac58 841ca7b0 841c44d4 84c5a400 9e80: eb3c9ee4 eb3c9e90 80795a14 8078bd04 00000064 00000001 00000000 eb3c9eac 9ea0: 8598cc10 8341f5d8 00006400 0000000b eb3c9ea0 00000000 00000000 e0a1f9cd 9ec0: 84fa5600 40946400 20000140 20000140 00000003 84fa5600 eb3c9ef4 eb3c9ee8 9ee0: 80795b34 e0a1f9cd eb3c9f14 40946400 00000000 84fa5601 20000140 00000003 9f00: 84fa5600 84c5a400 eb3c9fa4 eb3c9f18 8056e2cc 813904ec ecac8b10 84c5a400 9f20: eb3c9f3c eb3c9f30 81a2d168 81a2d038 eb3c9f54 eb3c9f40 80261ffc 80293598 9f40: eb3c9fb0 40000000 eb3c9f84 eb3c9f58 802229ec 80261fb8 00000000 8281d09c 9f60: eb3c9fb0 0014c4a0 ecac8b10 80222940 00000000 e0a1f9cd eb3c9fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 84c5a400 00000036 00000000 eb3c9fa8 9fa0: 80200060 8056e1a8 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc80bc 9fe0: 76bc7ec0 76bc7eb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<813a4c68>] (subdev_8255_io) from [<813a49a0>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00002166 r6:00002166 r5:841ca780 r4:813a4c68 [<813a4948>] (subdev_8255_do_config) from [<813a4d60>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a4948>] (subdev_8255_do_config) from [<813a4d60>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85429084 [<813a4cd4>] (subdev_8255_io_init) from [<813a4f54>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a4cd4>] (subdev_8255_io_init) from [<813a4f54>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00002166 r6:eb3c9db0 r5:841ca780 r4:85429084 [<813a4e98>] (dev_8255_attach) from [<81393e78>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:841ca780 r7:eb3c9d98 r6:00000000 r5:841ca780 r4:829c53f0 [<81393d74>] (comedi_device_attach) from [<8138fb08>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84c5a400 r7:20000140 r6:b5403587 r5:841ca780 r4:20000140 [<8138fa30>] (do_devconfig_ioctl) from [<81390abc>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:841ca780 r4:84fa5600 [<813904e0>] (comedi_unlocked_ioctl) from [<8056e2cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813904e0>] (comedi_unlocked_ioctl) from [<8056e2cc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<813904e0>] (comedi_unlocked_ioctl) from [<8056e2cc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<813904e0>] (comedi_unlocked_ioctl) from [<8056e2cc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:84c5a400 r9:84fa5600 r8:00000003 r7:20000140 r6:84fa5601 r5:00000000 r4:40946400 [<8056e19c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeb3c9fa8 to 0xeb3c9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc80bc 9fe0: 76bc7ec0 76bc7eb0 000193a4 00131f40 r10:00000036 r9:84c5a400 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