8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5029 Comm: syz.1.271 Not tainted 6.17.0-rc1-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 : [<813b7f10>] lr : [<813b7efc>] psr: 60000013 sp : dfa41cb8 ip : dfa41cb8 fp : dfa41cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 841bc000 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 841bc000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860662c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 841bc000 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 841bc000 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 0xdfa40000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa40000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.271 (pid: 5029, stack limit = 0xdfa40000) Stack: (0xdfa41cb8 to 0xdfa42000) 1ca0: 813b7eb0 841bc000 1cc0: 00004f27 00004f27 dfa41cf4 dfa41cd8 813b7be8 813b7ebc 00004f27 80503d54 1ce0: 85948800 85948800 dfa41d14 dfa41cf8 813b7fa8 813b7b9c 85948800 841bc000 1d00: dfa41da4 00004f27 dfa41d54 dfa41d18 813b819c 813b7f28 829d0084 841bc000 1d20: b5403587 00000000 841bc000 829d0084 841bc000 841bc044 dfa41d90 841bc000 1d40: 00000000 82b16f00 dfa41d8c dfa41d58 813a70a0 813b80ec 80000013 00000000 1d60: dfa41d7c 200000c0 841bc000 b5403587 200000c0 849a8000 40946400 00000003 1d80: dfa41e4c dfa41d90 813a2c20 813a6fa4 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000009 00000002 00000401 00000001 00000005 00000fff 1dc0: 5c952399 00000005 000003ff 00000802 00001600 fffffffe 00000000 00000009 1de0: 0000e1cb 00400006 00000001 00400003 00000396 80000089 fffffffd 00000000 1e00: 00000009 ffffeadb 00000003 2000003c 00000008 00000004 08000000 00000006 1e20: 00000000 1f664852 00000000 85cfba80 841bc000 200000c0 200000c0 849a8000 1e40: dfa41f14 dfa41e50 813a3bec 813a2b2c 00000000 00000000 00000000 1f664852 1e60: 00000000 00000000 8247054c 0000005f 84276858 841bc030 841946cc 849a8000 1e80: dfa41ee4 dfa41e90 8079795c 8078dcc0 00000064 00000001 00000000 dfa41eac 1ea0: 85c0a910 8342f330 00006400 0000000b dfa41ea0 00000000 00000000 1f664852 1ec0: 85cfba80 40946400 200000c0 200000c0 85cfba80 00000003 dfa41ef4 dfa41ee8 1ee0: 80797a7c 1f664852 dfa41f14 40946400 00000000 85cfba81 200000c0 85cfba80 1f00: 00000003 849a8000 dfa41fa4 dfa41f18 8056cf18 813a361c ecac8b10 849a8000 1f20: dfa41f3c dfa41f30 81a388b8 81a38788 dfa41f54 dfa41f40 8025e490 8028ef8c 1f40: dfa41fb0 40000000 dfa41f84 dfa41f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfa41fb0 0014c820 ecac8b10 80222940 00000000 1f664852 dfa41fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 849a8000 00000036 00000000 dfa41fa8 1fa0: 80200060 8056cdf4 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76faa0bc 1fe0: 76fa9ec0 76fa9eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813b7eb0>] (subdev_8255_io) from [<813b7be8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:841bc000 r4:813b7eb0 [<813b7b90>] (subdev_8255_do_config) from [<813b7fa8>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b7b90>] (subdev_8255_do_config) from [<813b7fa8>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85948800 [<813b7f1c>] (subdev_8255_io_init) from [<813b819c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b7f1c>] (subdev_8255_io_init) from [<813b819c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfa41da4 r5:841bc000 r4:85948800 [<813b80e0>] (dev_8255_attach) from [<813a70a0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:841bc000 r7:dfa41d90 r6:841bc044 r5:841bc000 r4:829d0084 [<813a6f98>] (comedi_device_attach) from [<813a2c20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:849a8000 r7:200000c0 r6:b5403587 r5:841bc000 r4:200000c0 [<813a2b20>] (do_devconfig_ioctl) from [<813a3bec>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:849a8000 r7:200000c0 r6:200000c0 r5:841bc000 r4:85cfba80 [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:849a8000 r9:00000003 r8:85cfba80 r7:200000c0 r6:85cfba81 r5:00000000 r4:40946400 [<8056cde8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa41fa8 to 0xdfa41ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76faa0bc 1fe0: 76fa9ec0 76fa9eb0 0001948c 001322c0 r10:00000036 r9:849a8000 r8:8020029c r7:00000036 r6:002f6308 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