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: 20758 Comm: syz.9.12678 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 : [<8143e0e0>] lr : [<8143e0cc>] psr: 60000013 sp : dfa1dcb8 ip : dfa1dcb8 fp : dfa1dcd4 r10: 00000000 r9 : 00000084 r8 : dfa1dda4 r7 : 00004f27 r6 : 0000009b r5 : 8385e540 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8385e540 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8699fcc0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8385e540 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 8385e540 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 0xdfa1c000 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 0xdfa1c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfa1c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.9.12678 (pid: 20758, stack limit = 0xdfa1c000) Stack: (0xdfa1dcb8 to 0xdfa1e000) dca0: 8143e080 00004f27 dcc0: 8385e540 00004f27 dfa1dcf4 dfa1dcd8 8143ddbc 8143e08c 00004f27 80522490 dce0: 85584800 85584800 dfa1dd14 dfa1dcf8 8143e174 8143dd70 8385e540 00000000 dd00: 85584800 00004f27 dfa1dd54 dfa1dd18 8143e324 8143e0f8 829d6e04 8385e540 dd20: 00000000 00000000 8385e540 829d6e04 8385e540 00000000 dfa1dd90 8385e540 dd40: 00000000 82b2efdc dfa1dd8c dfa1dd58 8142cc5c 8143e2bc b5403587 00000000 dd60: 00000003 200000c0 8385e540 b5403587 40946400 00000003 00000003 85176c00 dd80: dfa1de4c dfa1dd90 81428470 8142cb5c 35353238 00000000 00000000 00000000 dda0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff ddc0: 5c952399 80000005 000003ff 00000802 00001600 00000001 00000000 00000009 dde0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 de00: fffffff5 ffffeadc 00000003 0000003c 00000008 00000004 08000000 dffffffa de20: 00000000 ad6d3318 00000000 86a609c0 8385e540 200000c0 40946400 00000003 de40: dfa1df14 dfa1de50 81429794 814283a8 00000000 ad6d3318 00000000 00000000 de60: 824b857c dfa1dea4 0000005f 8420d408 00000064 8385e570 dfa1dee4 dfa1de88 de80: 807cd6ec 807c3ac4 00000064 00000001 00000000 dfa1dea4 8652c910 83433d48 dea0: 00006400 0000000b dfa1de98 00000000 00000000 ad6d3318 00000000 86a609c0 dec0: 40946400 200000c0 200000c0 86a609c0 00000003 85176c00 dfa1def4 dfa1dee8 dee0: 807cd81c ad6d3318 dfa1df14 00000000 86a609c1 40946400 200000c0 86a609c0 df00: 00000003 85176c00 dfa1dfa4 dfa1df18 8058f600 8142944c ecac8b10 85176c00 df20: dfa1df3c dfa1df30 81ae15b4 81ae1480 dfa1df54 dfa1df40 8025a85c 8028c030 df40: dfa1dfb0 40000000 dfa1df84 dfa1df58 80220bf8 8025a818 00000000 8281d2bc df60: dfa1dfb0 0013e290 ecac8b10 80220b4c 00000000 ad6d3318 dfa1dfac 00000000 df80: 00000000 00346310 00000036 8020029c 85176c00 00000036 00000000 dfa1dfa8 dfa0: 80200060 8058f3c8 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0b0dc dfe0: 76f0ae88 76f0ae78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143e080>] (subdev_8255_io) from [<8143ddbc>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8385e540 r5:00004f27 r4:8143e080 [<8143dd64>] (subdev_8255_do_config) from [<8143e174>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8143dd64>] (subdev_8255_do_config) from [<8143e174>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85584800 [<8143e0ec>] (subdev_8255_io_init) from [<8143e324>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143e0ec>] (subdev_8255_io_init) from [<8143e324>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:85584800 r5:00000000 r4:8385e540 [<8143e2b0>] (dev_8255_attach) from [<8142cc5c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8385e540 r7:dfa1dd90 r6:00000000 r5:8385e540 r4:829d6e04 [<8142cb50>] (comedi_device_attach) from [<81428470>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:85176c00 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8385e540 r4:200000c0 [<8142839c>] (do_devconfig_ioctl) from [<81429794>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8385e540 r4:86a609c0 [<81429440>] (comedi_unlocked_ioctl) from [<8058f600>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81429440>] (comedi_unlocked_ioctl) from [<8058f600>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81429440>] (comedi_unlocked_ioctl) from [<8058f600>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81429440>] (comedi_unlocked_ioctl) from [<8058f600>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85176c00 r9:00000003 r8:86a609c0 r7:200000c0 r6:40946400 r5:86a609c1 r4:00000000 [<8058f3bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa1dfa8 to 0xdfa1dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0b0dc dfe0: 76f0ae88 76f0ae78 00018ba0 001300f0 r10:00000036 r9:85176c00 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