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: 7928 Comm: syz.0.1009 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 : [<813dbc00>] lr : [<813dbbec>] psr: 60000013 sp : df9c9cb8 ip : df9c9cb8 fp : df9c9cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 840cca80 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 840cca80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84914fc0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 840cca80 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 840cca80 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 0xdf9c8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdf9c8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.1009 (pid: 7928, stack limit = 0xdf9c8000) Stack: (0xdf9c9cb8 to 0xdf9ca000) 9ca0: 813dbba0 840cca80 9cc0: 00004f27 00004f27 df9c9cf4 df9c9cd8 813db8d8 813dbbac 00004f27 8050a7fc 9ce0: 85464000 85464000 df9c9d14 df9c9cf8 813dbc98 813db88c 85464000 840cca80 9d00: df9c9da4 00004f27 df9c9d54 df9c9d18 813dbe8c 813dbc18 82af1fe0 85d82600 9d20: 828215f0 00000000 00000000 829d23cc 840cca80 840ccac4 df9c9d90 840cca80 9d40: 00000000 82b25910 df9c9d8c df9c9d58 813cad84 813dbddc 200000c0 00000000 9d60: df9c9d7c 200000c0 840cca80 b5403587 200000c0 85d1d400 40946400 00000003 9d80: df9c9e4c df9c9d90 813c68d0 813cac88 35353238 00000000 00000000 00000000 9da0: 00000000 00004f27 00000009 00000002 00000401 00000001 00000cc7 00000fff 9dc0: 5c952399 00000005 000003ff 00000802 00001600 fffffffe 00000001 00000009 9de0: 0000e1cb 00000006 00000004 00000003 00000396 80000089 fffffffd 00000000 9e00: fffffff5 ffffeadb 00000003 0000003c 00000008 00000004 08000000 dffffffa 9e20: 00000000 10d56c8d 00000000 85db1e40 840cca80 200000c0 200000c0 85d1d400 9e40: df9c9f14 df9c9e50 813c789c 813c67dc 00000000 00000000 00000000 10d56c8d 9e60: 00000000 00000000 824625b4 0000005f 8423a838 840ccab0 841d1054 85d1d400 9e80: df9c9ee4 df9c9e90 807a7d9c 8079e194 00000064 00000001 00000000 df9c9eac 9ea0: 85831850 8342ea18 00006400 0000000b df9c9ea0 00000000 00000000 10d56c8d 9ec0: 85db1e40 40946400 200000c0 200000c0 85db1e40 00000003 df9c9ef4 df9c9ee8 9ee0: 807a7ebc 10d56c8d df9c9f14 40946400 00000000 85db1e41 200000c0 85db1e40 9f00: 00000003 85d1d400 df9c9fa4 df9c9f18 80578f00 813c72cc df9c9f3c df9c9f28 9f20: 8025c42c 8022859c 85d1d400 00000001 df9c9f54 df9c9f40 8025c484 8028d914 9f40: df9c9fb0 40000000 df9c9f84 df9c9f58 802229ec 8025c440 00000000 8281cfb4 9f60: df9c9fb0 0014ced0 ecac8b10 80222940 00000000 10d56c8d df9c9fac 00000000 9f80: 00000000 00316308 00000036 8020029c 85d1d400 00000036 00000000 df9c9fa8 9fa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fb90bc 9fe0: 76fb8ec0 76fb8eb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813dbba0>] (subdev_8255_io) from [<813db8d8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:840cca80 r4:813dbba0 [<813db880>] (subdev_8255_do_config) from [<813dbc98>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db880>] (subdev_8255_do_config) from [<813dbc98>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85464000 [<813dbc0c>] (subdev_8255_io_init) from [<813dbe8c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbc0c>] (subdev_8255_io_init) from [<813dbe8c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:df9c9da4 r5:840cca80 r4:85464000 [<813dbdd0>] (dev_8255_attach) from [<813cad84>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:840cca80 r7:df9c9d90 r6:840ccac4 r5:840cca80 r4:829d23cc [<813cac7c>] (comedi_device_attach) from [<813c68d0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85d1d400 r7:200000c0 r6:b5403587 r5:840cca80 r4:200000c0 [<813c67d0>] (do_devconfig_ioctl) from [<813c789c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85d1d400 r7:200000c0 r6:200000c0 r5:840cca80 r4:85db1e40 [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85d1d400 r9:00000003 r8:85db1e40 r7:200000c0 r6:85db1e41 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9c9fa8 to 0xdf9c9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fb90bc 9fe0: 76fb8ec0 76fb8eb0 00019294 00132970 r10:00000036 r9:85d1d400 r8:8020029c r7:00000036 r6:00316308 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