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: 7848 Comm: syz.0.822 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 : [<81415a14>] lr : [<81415a00>] psr: 60000013 sp : dfad5cb0 ip : dfad5cb0 fp : dfad5ccc r10: 00000001 r9 : 00000084 r8 : dfad5d9c r7 : 00004f27 r6 : 0000009b r5 : 8456da80 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8456da80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 866a5b80 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8456da80 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 8456da80 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 0xdfad4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfad4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfad4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.822 (pid: 7848, stack limit = 0xdfad4000) Stack: (0xdfad5cb0 to 0xdfad6000) 5ca0: 814159b4 8456da80 00004f27 00004f27 5cc0: dfad5cec dfad5cd0 814156ec 814159c0 00004f27 80514fb4 8526f800 8526f800 5ce0: dfad5d0c dfad5cf0 81415aac 814156a0 8456da80 00000000 8526f800 00004f27 5d00: dfad5d4c dfad5d10 81415c58 81415a2c 8280cc60 83e62080 828217b0 00000000 5d20: 00000000 829d46a0 8456da80 8456dac4 dfad5d88 8456da80 00000000 82b28ad8 5d40: dfad5d84 dfad5d50 81404788 81415bf0 8456dab0 00000000 dfad5d74 200000c0 5d60: 8456da80 b5403587 8456dab0 85dd9800 40946400 00000003 dfad5e44 dfad5d88 5d80: 814000e0 8140468c 35353238 00000000 00000000 00000000 00000000 00004f27 5da0: 00000005 00000002 00000401 00000001 00000cc8 00000fff 5c952399 00000005 5dc0: 000003ff 00000802 00001600 00000000 00000001 00000009 0000e1cb 00000008 5de0: 000000d4 00000003 00000000 00000000 0100d5f2 00000020 f7fffff5 ffffeadb 5e00: ffffffff 00000002 00000008 00000004 08000000 00000009 00000000 09a95ce7 5e20: 00000000 85d8a840 8456da80 200000c0 8456dab0 85dd9800 dfad5f14 dfad5e48 5e40: 814010d4 813fffec 00000000 00000000 00000000 00000000 00000000 09a95ce7 5e60: 00000000 00000000 824a35ec 0000005f 83fd7be8 00000064 8459e09c 85dd9800 5e80: dfad5ee4 dfad5e90 807b7ea8 807ae3cc 00000064 00000001 00000000 dfad5eac 5ea0: 85870a90 834f3000 00006400 0000000b dfad5ea0 00000000 00000000 09a95ce7 5ec0: 85d8a840 40946400 200000c0 200000c0 85d8a840 00000003 dfad5ef4 dfad5ee8 5ee0: 807b7fc8 09a95ce7 dfad5f14 40946400 00000000 85d8a841 200000c0 85d8a840 5f00: 00000003 85dd9800 dfad5fa4 dfad5f18 805855f0 81400b24 ecac8b10 85dd9800 5f20: dfad5f3c dfad5f30 81aaf74c 81aaf61c dfad5f54 dfad5f40 8025bcbc 8028e0c4 5f40: dfad5fb0 40000000 dfad5f84 dfad5f58 80221a38 8025bc78 00000000 8281d17c 5f60: dfad5fb0 0014c880 ecac8b10 8022198c 00000000 09a95ce7 dfad5fac 00000000 5f80: 00000000 00316310 00000036 8020029c 85dd9800 00000036 00000000 dfad5fa8 5fa0: 80200060 805854cc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fe70bc 5fe0: 76fe6ec0 76fe6eb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<814159b4>] (subdev_8255_io) from [<814156ec>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8456da80 r4:814159b4 [<81415694>] (subdev_8255_do_config) from [<81415aac>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81415694>] (subdev_8255_do_config) from [<81415aac>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8526f800 [<81415a20>] (subdev_8255_io_init) from [<81415c58>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415a20>] (subdev_8255_io_init) from [<81415c58>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:8526f800 r5:00000000 r4:8456da80 [<81415be4>] (dev_8255_attach) from [<81404788>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:8456da80 r7:dfad5d88 r6:8456dac4 r5:8456da80 r4:829d46a0 [<81404680>] (comedi_device_attach) from [<814000e0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85dd9800 r7:8456dab0 r6:b5403587 r5:8456da80 r4:200000c0 [<813fffe0>] (do_devconfig_ioctl) from [<814010d4>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85dd9800 r7:8456dab0 r6:200000c0 r5:8456da80 r4:85d8a840 [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85dd9800 r9:00000003 r8:85d8a840 r7:200000c0 r6:85d8a841 r5:00000000 r4:40946400 [<805854c0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfad5fa8 to 0xdfad5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fe70bc 5fe0: 76fe6ec0 76fe6eb0 0001929c 00132320 r10:00000036 r9:85dd9800 r8:8020029c r7:00000036 r6:00316310 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