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: 10946 Comm: syz.1.1087 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 : [<8143e110>] lr : [<8143e0fc>] psr: 60000013 sp : dfa61cb8 ip : dfa61cb8 fp : dfa61cd4 r10: 00000000 r9 : 00000084 r8 : dfa61da4 r7 : 00004f27 r6 : 0000009b r5 : 8385f000 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8385f000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85236d00 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8385f000 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 8385f000 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 0xdfa60000 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 0xdfa60000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfa60000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.1.1087 (pid: 10946, stack limit = 0xdfa60000) Stack: (0xdfa61cb8 to 0xdfa62000) 1ca0: 8143e0b0 00004f27 1cc0: 8385f000 00004f27 dfa61cf4 dfa61cd8 8143ddec 8143e0bc 00004f27 80522738 1ce0: 86cd0000 86cd0000 dfa61d14 dfa61cf8 8143e1a4 8143dda0 8385f000 00000000 1d00: 86cd0000 00004f27 dfa61d54 dfa61d18 8143e354 8143e128 82b1a7fc 8390c380 1d20: 828217c0 00000000 00000000 829d6e04 8385f000 00000000 dfa61d90 8385f000 1d40: 00000000 82b2efdc dfa61d8c dfa61d58 8142cc98 8143e2ec 40946400 00000000 1d60: dfa61d7c 200000c0 8385f000 b5403587 40946400 00000003 00000003 8664d400 1d80: dfa61e4c dfa61d90 814284a4 8142cb98 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00020002 00000401 fffffffd 00000cc4 00000ff7 1dc0: 5c952398 00000001 000003ff 00000006 00001602 00000009 00000001 fffffffa 1de0: 0000e1cb 00000009 00000004 00000020 00000006 8000008b fffffffe 0000000b 1e00: fffffffe ffffeadb 00000400 00000039 00000000 02000004 00000002 dffffffa 1e20: 00000000 5e0214c2 00000000 86ee2300 8385f000 200000c0 40946400 00000003 1e40: dfa61f14 dfa61e50 814297c8 814283dc 00000000 5e0214c2 00000000 00000000 1e60: 824b857c dfa61ea4 0000005f 83e73408 00000064 8385f030 dfa61ee4 dfa61e88 1e80: 807cd874 807c3c4c 00000064 00000001 00000000 dfa61ea4 86482cd0 83426220 1ea0: 00006400 0000000b dfa61e98 00000000 00000000 5e0214c2 00000000 86ee2300 1ec0: 40946400 200000c0 200000c0 86ee2300 00000003 8664d400 dfa61ef4 dfa61ee8 1ee0: 807cd9a4 5e0214c2 dfa61f14 00000000 86ee2301 40946400 200000c0 86ee2300 1f00: 00000003 8664d400 dfa61fa4 dfa61f18 8058f904 81429480 ecac8b10 8664d400 1f20: dfa61f3c dfa61f30 81ae1534 81ae1400 dfa61f54 dfa61f40 8025a85c 8028c358 1f40: dfa61fb0 40000000 dfa61f84 dfa61f58 80220bf8 8025a818 00000000 8281d2bc 1f60: dfa61fb0 0013e290 ecac8b10 80220b4c 00000000 5e0214c2 dfa61fac 00000000 1f80: 00000000 00346310 00000036 8020029c 8664d400 00000036 00000000 dfa61fa8 1fa0: 80200060 8058f6cc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fd30dc 1fe0: 76fd2e88 76fd2e78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e0b0>] (subdev_8255_io) from [<8143ddec>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8385f000 r5:00004f27 r4:8143e0b0 [<8143dd94>] (subdev_8255_do_config) from [<8143e1a4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143dd94>] (subdev_8255_do_config) from [<8143e1a4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86cd0000 [<8143e11c>] (subdev_8255_io_init) from [<8143e354>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e11c>] (subdev_8255_io_init) from [<8143e354>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:86cd0000 r5:00000000 r4:8385f000 [<8143e2e0>] (dev_8255_attach) from [<8142cc98>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8385f000 r7:dfa61d90 r6:00000000 r5:8385f000 r4:829d6e04 [<8142cb8c>] (comedi_device_attach) from [<814284a4>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8664d400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8385f000 r4:200000c0 [<814283d0>] (do_devconfig_ioctl) from [<814297c8>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8385f000 r4:86ee2300 [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429474>] (comedi_unlocked_ioctl) from [<8058f904>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8664d400 r9:00000003 r8:86ee2300 r7:200000c0 r6:40946400 r5:86ee2301 r4:00000000 [<8058f6c0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa61fa8 to 0xdfa61ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fd30dc 1fe0: 76fd2e88 76fd2e78 00018ba0 001300f0 r10:00000036 r9:8664d400 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