8<--- cut here --- Unable to handle kernel paging request at virtual address fee01003 when write [fee01003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6612 Comm: syz.1.907 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 : [<814658e8>] lr : [<814658d4>] psr: 60000013 sp : df9ddcb8 ip : df9ddcb8 fp : df9ddcd4 r10: 00001000 r9 : 00000004 r8 : df9ddda4 r7 : 00000000 r6 : 0000009b r5 : 8301a000 r4 : 00001003 r3 : 0000009b r2 : fee01003 r1 : 00000001 r0 : 8301a000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8617b9c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8301a000 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8301a000 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.1.907 (pid: 6612, stack limit = 0xdf9dc000) Stack: (0xdf9ddcb8 to 0xdf9de000) dca0: 81465888 00001000 dcc0: 8301a000 00000000 df9ddcf4 df9ddcd8 814655c4 81465894 00001000 805320dc dce0: 85f81000 85f81000 df9ddd14 df9ddcf8 8146597c 81465578 8301a000 00000000 dd00: 85f81000 00000000 df9ddd54 df9ddd18 81465b2c 81465900 ffffffff 00000004 dd20: 82a208c0 00000000 00000000 82bd325c 8301a000 00000000 df9ddd90 8301a000 dd40: 00000000 82d2cdc4 df9ddd8c df9ddd58 814544b4 81465ac4 40946400 00000000 dd60: df9ddd7c 20000380 8301a000 b5403587 40946400 00000001 00000007 845f3100 dd80: df9dde4c df9ddd90 8144fcc0 814543b8 35353238 00000000 00000000 00000000 dda0: 00000000 00001000 00002080 00000a1a 00000004 00000006 0800afa3 00000000 ddc0: 00000002 00005855 00000002 0000000b 000007ff 00000001 00000005 00000006 dde0: 00000002 00000000 00000004 00000002 0000000a 00000008 0000caa2 00001003 de00: 20001e5b 02000003 00000e69 00000002 00000004 00004086 00000000 000006f5 de20: 00000000 1bf8d1fe 00000000 86073180 8301a000 20000380 40946400 00000001 de40: df9ddf14 df9dde50 81450fe4 8144fbf8 df9dde4c 1bf8d1fe 00000000 00000000 de60: 82530804 df9ddea4 0000005f 841932c8 00000064 8301a030 df9ddee4 df9dde88 de80: 807e9240 807df554 00000064 00000001 00000000 df9ddea4 830eb0d0 8342ddd0 dea0: 00006400 0000000b df9dde98 00000000 df9ddd38 1bf8d1fe 00000000 86073180 dec0: 40946400 20000380 20000380 86073180 00000007 845f3100 df9ddef4 df9ddee8 dee0: 807e9374 1bf8d1fe df9ddf14 00000000 86073181 40946400 20000380 86073180 df00: 00000007 845f3100 df9ddfa4 df9ddf18 805a16e0 81450c9c ecac8b10 845f3100 df20: df9ddf3c df9ddf30 81b160d4 81b15fa0 df9ddf54 df9ddf40 8025a664 8028e168 df40: df9ddfb0 40000000 df9ddf84 df9ddf58 80220be0 8025a620 00000000 82a1c5fc df60: df9ddfb0 0013e940 ecac8b10 80220b34 00000000 1bf8d1fe df9ddfac 00000000 df80: 00000000 00346310 00000036 8020029c 845f3100 00000036 00000000 df9ddfa8 dfa0: 80200060 805a14a8 00000000 00000000 00000007 40946400 20000380 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f880dc dfe0: 76f87e88 76f87e78 00018e58 001307a0 60000010 00000007 00000000 00000000 Call trace: [<81465888>] (subdev_8255_io) from [<814655c4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301a000 r5:00001000 r4:81465888 [<8146556c>] (subdev_8255_do_config) from [<8146597c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8146556c>] (subdev_8255_do_config) from [<8146597c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85f81000 [<814658f4>] (subdev_8255_io_init) from [<81465b2c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814658f4>] (subdev_8255_io_init) from [<81465b2c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85f81000 r5:00000000 r4:8301a000 [<81465ab8>] (dev_8255_attach) from [<814544b4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2cdc4 r9:00000000 r8:8301a000 r7:df9ddd90 r6:00000000 r5:8301a000 r4:82bd325c [<814543ac>] (comedi_device_attach) from [<8144fcc0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:845f3100 r9:00000007 r8:00000001 r7:40946400 r6:b5403587 r5:8301a000 r4:20000380 [<8144fbec>] (do_devconfig_ioctl) from [<81450fe4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000380 r5:8301a000 r4:86073180 [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81450c90>] (comedi_unlocked_ioctl) from [<805a16e0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:845f3100 r9:00000007 r8:86073180 r7:20000380 r6:40946400 r5:86073181 r4:00000000 [<805a149c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9ddfa8 to 0xdf9ddff0) dfa0: 00000000 00000000 00000007 40946400 20000380 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f880dc dfe0: 76f87e88 76f87e78 00018e58 001307a0 r10:00000036 r9:845f3100 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