8<--- cut here --- Unable to handle kernel paging request at virtual address fee000ef when write [fee000ef] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 12286 Comm: syz.5.1821 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 : ee055cc0 ip : ee055cc0 fp : ee055cdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 000000ec r6 : 0000009b r5 : 8410fa80 r4 : 000000ef r3 : 0000009b r2 : fee000ef r1 : 00000001 r0 : 8410fa80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 859cf040 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8410fa80 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 8410fa80 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: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xee054000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xee054000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.5.1821 (pid: 12286, stack limit = 0xee054000) Stack: (0xee055cc0 to 0xee056000) 5cc0: 813a4bf0 8410fa80 000000ec 000000ec ee055cfc ee055ce0 813a4928 813a4bfc 5ce0: 000000ec 80507884 84099000 84099000 ee055d1c ee055d00 813a4ce8 813a48dc 5d00: 84099000 8410fa80 ee055dac 000000ec ee055d5c ee055d20 813a4edc 813a4c68 5d20: 20000013 85dc2f80 82822670 00000000 00000000 829c5270 8410fa80 00000000 5d40: ee055d98 8410fa80 00000000 82b15078 ee055d94 ee055d60 81393e00 813a4e2c 5d60: 20000140 00000000 ee055d84 20000140 8410fa80 b5403587 20000140 84f01800 5d80: 40946400 00000003 ee055e4c ee055d98 8138fa90 81393d08 35353238 00000000 5da0: 00000000 00000000 00000000 000000ec 00002168 00000002 0000000c 000088d2 5dc0: 0000008f 00000009 00000010 00000002 ffffffff 000001ff 00000008 00000344 5de0: 00000004 00000007 00000001 40000009 00000003 00000000 ffffffff 00000100 5e00: 00000003 00000080 00000000 00000001 00000001 0000b0c4 0000001c 00000008 5e20: 00000007 00000ecf 00000000 76e953b9 00000000 84997f00 8410fa80 20000140 5e40: ee055f14 ee055e50 81390a44 8138f9c4 00000000 00000000 00000000 76e953b9 5e60: 00000000 00000000 8246a3fc 0000005f 841fc458 8410fab0 84128e1c 84f01800 5e80: ee055ee4 ee055e90 80795a0c 8078bcfc 00000064 00000001 00000000 ee055eac 5ea0: 84936f10 834f0ee0 00006400 0000000b ee055ea0 00000000 00000000 76e953b9 5ec0: 84997f00 40946400 20000140 20000140 00000003 84997f00 ee055ef4 ee055ee8 5ee0: 80795b2c 76e953b9 ee055f14 40946400 00000000 84997f01 20000140 00000003 5f00: 84997f00 84f01800 ee055fa4 ee055f18 8056e2dc 81390474 ecac8b10 84f01800 5f20: ee055f3c ee055f30 81a2cd08 81a2cbd8 ee055f54 ee055f40 80261ffc 80293598 5f40: ee055fb0 40000000 ee055f84 ee055f58 802229ec 80261fb8 00000000 8281d09c 5f60: ee055fb0 0014c4a0 ecac8b10 80222940 00000000 76e953b9 ee055fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 84f01800 00000036 00000000 ee055fa8 5fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b440bc 5fe0: 76b43ec0 76b43eb0 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) r7:000000ec r6:000000ec r5:8410fa80 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) r4:84099000 [<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) r7:000000ec r6:ee055dac r5:8410fa80 r4:84099000 [<813a4e20>] (dev_8255_attach) from [<81393e00>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:8410fa80 r7:ee055d98 r6:00000000 r5:8410fa80 r4:829c5270 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84f01800 r7:20000140 r6:b5403587 r5:8410fa80 r4:20000140 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:8410fa80 r4:84997f00 [<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) r10:84f01800 r9:84997f00 r8:00000003 r7:20000140 r6:84997f01 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xee055fa8 to 0xee055ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b440bc 5fe0: 76b43ec0 76b43eb0 000193a4 00131f40 r10:00000036 r9:84f01800 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