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: 3772 Comm: syz.0.11 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 : [<8143e530>] lr : [<8143e51c>] psr: 60000013 sp : e4341cb8 ip : e4341cb8 fp : e4341cd4 r10: 00000000 r9 : 00000084 r8 : e4341da4 r7 : 00004f27 r6 : 0000009b r5 : 8385fc00 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8385fc00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85f09780 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8385fc00 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 8385fc00 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 0xe4340000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xe4340000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xe4340000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.0.11 (pid: 3772, stack limit = 0xe4340000) Stack: (0xe4341cb8 to 0xe4342000) 1ca0: 8143e4d0 00004f27 1cc0: 8385fc00 00004f27 e4341cf4 e4341cd8 8143e20c 8143e4dc 00004f27 805228d4 1ce0: 85ec1000 85ec1000 e4341d14 e4341cf8 8143e5c4 8143e1c0 8385fc00 00000000 1d00: 85ec1000 00004f27 e4341d54 e4341d18 8143e774 8143e548 82afde04 847d3700 1d20: 828217c0 00000000 00000000 829d6e04 8385fc00 00000000 e4341d90 8385fc00 1d40: 00000000 82b2efdc e4341d8c e4341d58 8142d0ac 8143e70c 40946400 00000000 1d60: e4341d7c 200000c0 8385fc00 b5403587 40946400 00000003 00000003 833c4800 1d80: e4341e4c e4341d90 814288c0 8142cfac 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00000002 00000401 fffffffe 00000cc7 00000fff 1dc0: 5c95239c 00000001 000003ff 00000006 00001600 00000001 04000009 00000009 1de0: 0000e1cb 00000006 00000004 00000010 00000000 8000008b fffffffe 00000009 1e00: fffffff5 ffffeadb 00000103 0000083c 00000000 00000004 00000002 dffffffa 1e20: 00000000 6a28ee01 00000000 8531f480 8385fc00 200000c0 40946400 00000003 1e40: e4341f14 e4341e50 81429be4 814287f8 00000000 6a28ee01 00000000 00000000 1e60: 824b857c e4341ea4 0000005f 84595de0 00000064 8385fc30 e4341ee4 e4341e88 1e80: 807cdb54 807c3f2c 00000064 00000001 00000000 e4341ea4 8337c0d0 8342bee0 1ea0: 00006400 0000000b e4341e98 00000000 00000000 6a28ee01 00000000 8531f480 1ec0: 40946400 200000c0 200000c0 8531f480 00000003 833c4800 e4341ef4 e4341ee8 1ee0: 807cdc84 6a28ee01 e4341f14 00000000 8531f481 40946400 200000c0 8531f480 1f00: 00000003 833c4800 e4341fa4 e4341f18 8058fa74 8142989c ecac8b10 833c4800 1f20: e4341f3c e4341f30 81ae19f4 81ae18c0 e4341f54 e4341f40 8025a85c 8028c340 1f40: e4341fb0 40000000 e4341f84 e4341f58 80220bf8 8025a818 00000000 8281d2bc 1f60: e4341fb0 0013e290 ecac8b10 80220b4c 00000000 6a28ee01 e4341fac 00000000 1f80: 00000000 00346310 00000036 8020029c 833c4800 00000036 00000000 e4341fa8 1fa0: 80200060 8058f83c 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f8a0dc 1fe0: 76f89e88 76f89e78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e4d0>] (subdev_8255_io) from [<8143e20c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8385fc00 r5:00004f27 r4:8143e4d0 [<8143e1b4>] (subdev_8255_do_config) from [<8143e5c4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143e1b4>] (subdev_8255_do_config) from [<8143e5c4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85ec1000 [<8143e53c>] (subdev_8255_io_init) from [<8143e774>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e53c>] (subdev_8255_io_init) from [<8143e774>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:85ec1000 r5:00000000 r4:8385fc00 [<8143e700>] (dev_8255_attach) from [<8142d0ac>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8385fc00 r7:e4341d90 r6:00000000 r5:8385fc00 r4:829d6e04 [<8142cfa0>] (comedi_device_attach) from [<814288c0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:833c4800 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8385fc00 r4:200000c0 [<814287ec>] (do_devconfig_ioctl) from [<81429be4>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8385fc00 r4:8531f480 [<81429890>] (comedi_unlocked_ioctl) from [<8058fa74>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429890>] (comedi_unlocked_ioctl) from [<8058fa74>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429890>] (comedi_unlocked_ioctl) from [<8058fa74>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429890>] (comedi_unlocked_ioctl) from [<8058fa74>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:833c4800 r9:00000003 r8:8531f480 r7:200000c0 r6:40946400 r5:8531f481 r4:00000000 [<8058f830>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe4341fa8 to 0xe4341ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f8a0dc 1fe0: 76f89e88 76f89e78 00018ba0 001300f0 r10:00000036 r9:833c4800 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