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: 0 UID: 0 PID: 15122 Comm: syz.9.1750 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 : [<8143e4c8>] lr : [<8143e4b4>] psr: 60000013 sp : ebb91cb8 ip : ebb91cb8 fp : ebb91cd4 r10: 00000000 r9 : 00000084 r8 : ebb91da4 r7 : 00004f27 r6 : 0000009b r5 : 8339fcc0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8339fcc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 867489c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8339fcc0 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 8339fcc0 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 0xebb90000 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 0xebb90000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xebb90000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.9.1750 (pid: 15122, stack limit = 0xebb90000) Stack: (0xebb91cb8 to 0xebb92000) 1ca0: 8143e468 00004f27 1cc0: 8339fcc0 00004f27 ebb91cf4 ebb91cd8 8143e1a4 8143e474 00004f27 80522784 1ce0: 865e9000 865e9000 ebb91d14 ebb91cf8 8143e55c 8143e158 8339fcc0 00000000 1d00: 865e9000 00004f27 ebb91d54 ebb91d18 8143e70c 8143e4e0 82b018c4 83338380 1d20: 828217c0 00000000 00000000 829d6e04 8339fcc0 00000000 ebb91d90 8339fcc0 1d40: 00000000 82b2efdc ebb91d8c ebb91d58 8142d050 8143e6a4 40946400 00000000 1d60: ebb91d7c 200000c0 8339fcc0 b5403587 40946400 00000003 00000007 84e30000 1d80: ebb91e4c ebb91d90 8142885c 8142cf50 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff 1dc0: 5c952399 80000005 000003ff 00000802 00001600 00000001 00000000 00000009 1de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 1e00: fffffff5 ffffeadc 00000003 0000003c 00000008 00000004 08000000 dffffffa 1e20: 00000000 836766df 00000000 838ba300 8339fcc0 200000c0 40946400 00000003 1e40: ebb91f14 ebb91e50 81429b80 81428794 00000000 836766df 00000000 00000000 1e60: 824b857c ebb91ea4 0000005f 845d5018 00000064 8339fcf0 ebb91ee4 ebb91e88 1e80: 807cda58 807c3e30 00000064 00000001 00000000 ebb91ea4 830cf790 834eaaa0 1ea0: 00006400 0000000b ebb91e98 00000000 00000000 836766df 00000000 838ba300 1ec0: 40946400 200000c0 200000c0 838ba300 00000007 84e30000 ebb91ef4 ebb91ee8 1ee0: 807cdb88 836766df ebb91f14 00000000 838ba301 40946400 200000c0 838ba300 1f00: 00000007 84e30000 ebb91fa4 ebb91f18 8058f968 81429838 ecac8b10 84e30000 1f20: ebb91f3c ebb91f30 81ae1bb4 81ae1a80 ebb91f54 ebb91f40 8025a868 8028c368 1f40: ebb91fb0 40000000 ebb91f84 ebb91f58 80220bf8 8025a824 00000000 8281d2bc 1f60: ebb91fb0 0013e480 ecac8b10 80220b4c 00000000 836766df ebb91fac 00000000 1f80: 00000000 00346310 00000036 8020029c 84e30000 00000036 00000000 ebb91fa8 1fa0: 80200060 8058f730 00000000 00000000 00000007 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc70dc 1fe0: 76fc6e88 76fc6e78 00018ba0 001302e0 60000010 00000007 00000000 00000000 Call trace: [<8143e468>] (subdev_8255_io) from [<8143e1a4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8339fcc0 r5:00004f27 r4:8143e468 [<8143e14c>] (subdev_8255_do_config) from [<8143e55c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143e14c>] (subdev_8255_do_config) from [<8143e55c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:865e9000 [<8143e4d4>] (subdev_8255_io_init) from [<8143e70c>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e4d4>] (subdev_8255_io_init) from [<8143e70c>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:865e9000 r5:00000000 r4:8339fcc0 [<8143e698>] (dev_8255_attach) from [<8142d050>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8339fcc0 r7:ebb91d90 r6:00000000 r5:8339fcc0 r4:829d6e04 [<8142cf44>] (comedi_device_attach) from [<8142885c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84e30000 r9:00000007 r8:00000003 r7:40946400 r6:b5403587 r5:8339fcc0 r4:200000c0 [<81428788>] (do_devconfig_ioctl) from [<81429b80>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8339fcc0 r4:838ba300 [<8142982c>] (comedi_unlocked_ioctl) from [<8058f968>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142982c>] (comedi_unlocked_ioctl) from [<8058f968>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142982c>] (comedi_unlocked_ioctl) from [<8058f968>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142982c>] (comedi_unlocked_ioctl) from [<8058f968>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84e30000 r9:00000007 r8:838ba300 r7:200000c0 r6:40946400 r5:838ba301 r4:00000000 [<8058f724>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xebb91fa8 to 0xebb91ff0) 1fa0: 00000000 00000000 00000007 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc70dc 1fe0: 76fc6e88 76fc6e78 00018ba0 001302e0 r10:00000036 r9:84e30000 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