8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2c when write [fee04f2c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7505 Comm: syz.1.1128 Not tainted 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 : [<81415c6c>] lr : [<81415c58>] psr: 60000013 sp : dfaf5cb0 ip : dfaf5cb0 fp : dfaf5ccc r10: 00000001 r9 : 00000084 r8 : dfaf5d9c r7 : 00004f29 r6 : 0000009b r5 : 846930c0 r4 : 00004f2c r3 : 0000009b r2 : fee04f2c r1 : 00000001 r0 : 846930c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 89715680 DAC: fffffffd Register r0 information: slab kmalloc-192 start 846930c0 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 846930c0 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 0xdfaf4000 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 0xdfaf4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfaf4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.1128 (pid: 7505, stack limit = 0xdfaf4000) Stack: (0xdfaf5cb0 to 0xdfaf6000) 5ca0: 81415c0c 846930c0 00004f29 00004f29 5cc0: dfaf5cec dfaf5cd0 81415944 81415c18 00004f29 80514fcc 851fe000 851fe000 5ce0: dfaf5d0c dfaf5cf0 81415d04 814158f8 846930c0 00000000 851fe000 00004f29 5d00: dfaf5d4c dfaf5d10 81415eb0 81415c84 0000005f 84419f00 828217b0 00000000 5d20: 00000000 829d46a0 846930c0 84693104 dfaf5d88 846930c0 00000000 82b28ad8 5d40: dfaf5d84 dfaf5d50 814049e0 81415e48 846930f0 00000000 dfaf5d74 20000680 5d60: 846930c0 b5403587 846930f0 83956c00 40946400 00000003 dfaf5e44 dfaf5d88 5d80: 81400338 814048e4 35353238 00000000 00000000 00000000 00000000 00004f29 5da0: 00000005 00000003 00000009 00000001 0000000b 00000012 00000002 00000081 5dc0: fffffffc 00000002 fffffffe 00000009 00001887 00000061 00000002 00000008 5de0: 00400009 00000009 00000005 00000099 000000c0 00000400 ffffffff 00008001 5e00: 02000e69 00000006 00080008 00000004 00000000 ffff0000 00000000 c7ca283c 5e20: 00000000 85ebba80 846930c0 20000680 846930f0 83956c00 dfaf5f14 dfaf5e48 5e40: 8140132c 81400244 00000000 00000000 00000000 dfaf5e54 dfaf5e54 c7ca283c 5e60: 00000000 00000000 824a35ec 0000005f 841ab018 00000064 842e8e1c 83956c00 5e80: dfaf5ee4 dfaf5e90 807b7f80 807ae4a4 00000064 00000001 00000000 dfaf5eac 5ea0: 85d18c10 83426e58 00006400 0000000b dfaf5ea0 00000000 dfaf5d40 c7ca283c 5ec0: 85ebba80 40946400 20000680 20000680 85ebba80 00000006 dfaf5ef4 dfaf5ee8 5ee0: 807b80a0 c7ca283c dfaf5f14 40946400 00000000 85ebba81 20000680 85ebba80 5f00: 00000006 83956c00 dfaf5fa4 dfaf5f18 80585608 81400d7c ecac8b10 83956c00 5f20: dfaf5f3c dfaf5f30 81aaf9ac 81aaf87c dfaf5f54 dfaf5f40 8025bcbc 8028e0c4 5f40: dfaf5fb0 40000000 dfaf5f84 dfaf5f58 80221a38 8025bc78 00000000 8281d17c 5f60: dfaf5fb0 0014c8c0 ecac8b10 8022198c 00000000 c7ca283c dfaf5fac 00000000 5f80: 00000000 00326310 00000036 8020029c 83956c00 00000036 00000000 dfaf5fa8 5fa0: 80200060 805854e4 00000000 00000000 00000006 40946400 20000680 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f690bc 5fe0: 76f68ec0 76f68eb0 000192bc 00132360 60000010 00000006 00000000 00000000 Call trace: [<81415c0c>] (subdev_8255_io) from [<81415944>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f29 r6:00004f29 r5:846930c0 r4:81415c0c [<814158ec>] (subdev_8255_do_config) from [<81415d04>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814158ec>] (subdev_8255_do_config) from [<81415d04>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:851fe000 [<81415c78>] (subdev_8255_io_init) from [<81415eb0>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415c78>] (subdev_8255_io_init) from [<81415eb0>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f29 r6:851fe000 r5:00000000 r4:846930c0 [<81415e3c>] (dev_8255_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:846930c0 r7:dfaf5d88 r6:84693104 r5:846930c0 r4:829d46a0 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83956c00 r7:846930f0 r6:b5403587 r5:846930c0 r4:20000680 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83956c00 r7:846930f0 r6:20000680 r5:846930c0 r4:85ebba80 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83956c00 r9:00000006 r8:85ebba80 r7:20000680 r6:85ebba81 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaf5fa8 to 0xdfaf5ff0) 5fa0: 00000000 00000000 00000006 40946400 20000680 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f690bc 5fe0: 76f68ec0 76f68eb0 000192bc 00132360 r10:00000036 r9:83956c00 r8:8020029c r7:00000036 r6:00326310 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