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: 1 UID: 0 PID: 11187 Comm: syz.6.1397 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<8141c4a0>] lr : [<8141c48c>] psr: 60000013 sp : ea78dcb8 ip : ea78dcb8 fp : ea78dcd4 r10: 00000000 r9 : 00000084 r8 : ea78dda4 r7 : 00004f27 r6 : 0000009b r5 : 83019600 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 83019600 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8548e7c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 83019600 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 83019600 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xea78c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xea78c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xea78c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2654 Process syz.6.1397 (pid: 11187, stack limit = 0xea78c000) Stack: (0xea78dcb8 to 0xea78e000) dca0: 8141c440 00004f27 dcc0: 83019600 00004f27 ea78dcf4 ea78dcd8 8141c17c 8141c44c 00004f27 80518a28 dce0: 857c7000 857c7000 ea78dd14 ea78dcf8 8141c534 8141c130 83019600 00000000 dd00: 857c7000 00004f27 ea78dd54 ea78dd18 8141c6e4 8141c4b8 82b11944 84386800 dd20: 82821780 00000000 00000000 829d6444 83019600 00000000 ea78dd90 83019600 dd40: 00000000 82b2df9c ea78dd8c ea78dd58 8140b0d4 8141c67c 40946400 00000000 dd60: ea78dd7c 200000c0 83019600 b5403587 40946400 844f8000 00000003 83019630 dd80: ea78de4c ea78dd90 81406a0c 8140afd4 35353238 00000000 00000000 00000000 dda0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff ddc0: 5c952399 00000005 000003ff 00000802 00001600 00000001 00000001 00000009 dde0: 0000e1cb 00000008 000000d4 00000003 00000000 00000000 0000d5f2 00000020 de00: f7fffff5 ffffeadb ffffffff 0000003c 00000008 00000004 08000000 00000009 de20: 00000000 465cbb2c 00000000 855b0e40 83019600 200000c0 40946400 844f8000 de40: ea78df14 ea78de50 8140758c 81406944 00000000 465cbb2c 00000000 00000000 de60: 824b457c ea78dea4 0000005f 841bf408 00000064 84384294 ea78dee4 ea78de88 de80: 807baa44 807b0e1c 00000064 00000001 00000000 ea78dea4 833b1610 834e3880 dea0: 00006400 0000000b ea78de98 00000000 00000000 465cbb2c 00000000 855b0e40 dec0: 40946400 200000c0 200000c0 855b0e40 00000003 844f8000 ea78def4 ea78dee8 dee0: 807bab74 465cbb2c ea78df14 00000000 855b0e41 40946400 200000c0 855b0e40 df00: 00000003 844f8000 ea78dfa4 ea78df18 80585038 81407494 ecac8b10 844f8000 df20: ea78df3c ea78df30 81ab96bc 81ab9588 ea78df54 ea78df40 8025a030 8028d95c df40: ea78dfb0 40000000 ea78df84 ea78df58 80220a4c 80259fec 00000000 8281d27c df60: ea78dfb0 0013ddc0 ecac8b10 802209a0 00000000 465cbb2c ea78dfac 00000000 df80: 00000000 00346310 00000036 8020029c 844f8000 00000036 00000000 ea78dfa8 dfa0: 80200060 80584e00 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f9d0dc dfe0: 76f9ce88 76f9ce78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<8141c440>] (subdev_8255_io) from [<8141c17c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:83019600 r5:00004f27 r4:8141c440 [<8141c124>] (subdev_8255_do_config) from [<8141c534>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8141c124>] (subdev_8255_do_config) from [<8141c534>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:857c7000 [<8141c4ac>] (subdev_8255_io_init) from [<8141c6e4>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8141c4ac>] (subdev_8255_io_init) from [<8141c6e4>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:857c7000 r5:00000000 r4:83019600 [<8141c670>] (dev_8255_attach) from [<8140b0d4>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2df9c r9:00000000 r8:83019600 r7:ea78dd90 r6:00000000 r5:83019600 r4:829d6444 [<8140afc8>] (comedi_device_attach) from [<81406a0c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83019630 r9:00000003 r8:844f8000 r7:40946400 r6:b5403587 r5:83019600 r4:200000c0 [<81406938>] (do_devconfig_ioctl) from [<8140758c>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:844f8000 r7:40946400 r6:200000c0 r5:83019600 r4:855b0e40 [<81407488>] (comedi_unlocked_ioctl) from [<80585038>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81407488>] (comedi_unlocked_ioctl) from [<80585038>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81407488>] (comedi_unlocked_ioctl) from [<80585038>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81407488>] (comedi_unlocked_ioctl) from [<80585038>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:844f8000 r9:00000003 r8:855b0e40 r7:200000c0 r6:40946400 r5:855b0e41 r4:00000000 [<80584df4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea78dfa8 to 0xea78dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f9d0dc dfe0: 76f9ce88 76f9ce78 00018734 0012fc20 r10:00000036 r9:844f8000 r8:8020029c r7:00000036 r6:00346310 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