8<--- cut here --- Unable to handle kernel paging request at virtual address fee03f03 when write [fee03f03] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7251 Comm: syz.4.774 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:99 [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 : [<8155ac50>] lr : [<8155ac3c>] psr: 60000013 sp : e02ddcb8 ip : e02ddcb8 fp : e02ddcd4 r10: 00003f00 r9 : 00000004 r8 : e02ddda4 r7 : 00000000 r6 : 0000009b r5 : 8535d480 r4 : 00003f03 r3 : 0000009b r2 : fee03f03 r1 : 00000001 r0 : 8535d480 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 87446200 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8535d480 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:974 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8535d480 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 0xe02dc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2798 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe02dc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2798 Register r12 information: 2-page vmalloc region starting at 0xe02dc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2798 Process syz.4.774 (pid: 7251, stack limit = 0xe02dc000) Stack: (0xe02ddcb8 to 0xe02de000) dca0: 8155abf0 00003f00 dcc0: 8535d480 00000000 e02ddcf4 e02ddcd8 8155a92c 8155abfc 00003f00 805796f0 dce0: 86ad1000 86ad1000 e02ddd14 e02ddcf8 8155ace4 8155a8e0 8535d480 00000000 dd00: 86ad1000 00000000 e02ddd54 e02ddd18 8155ae94 8155ac68 ffffffff 00000004 dd20: 8341e340 00000000 00000000 835dfbe8 8535d480 00000000 e02ddd90 8535d480 dd40: 00000000 83737400 e02ddd8c e02ddd58 8154988c 8155ae2c 40946400 00000000 dd60: e02ddd7c 20000280 8535d480 b5403587 40946400 00000001 00000003 877fa580 dd80: e02dde4c e02ddd90 815450a8 81549790 35353238 00000000 00000000 00000000 dda0: 00000000 00003f00 00000002 0000d09a ffffffff 00000005 fdfffffe 00000002 ddc0: 00000004 00001002 6fffc001 00000005 00000002 00000404 00000008 00000804 dde0: 00000002 00000004 00000003 00100830 00000008 00010000 00000009 00000090 de00: 00000009 20000006 00008001 00000006 02000151 00000000 00000002 00000006 de20: 00000000 8b5e415c 00000000 845d0800 8535d480 20000280 40946400 00000001 de40: e02ddf14 e02dde50 815463b8 81544fe8 8276ba64 84fbe990 00000064 84f3cb04 de60: e02ddee4 e02dde70 8085eb54 80854eb4 00000064 8535d4b0 00000000 e02dde90 de80: 00000000 88661910 840f0c38 40946400 0000000b 00000000 e02dde84 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 8b5e415c 00000000 845d0800 dec0: 40946400 20000280 20000280 845d0800 00000003 877fa580 e02ddef4 e02ddee8 dee0: 8085ec84 8b5e415c e02ddf14 00000000 845d0801 40946400 20000280 845d0800 df00: 00000003 877fa580 e02ddfa4 e02ddf18 805f3d14 81546070 ecac8b10 877fa580 df20: e02ddf3c e02ddf30 81c11730 81c115fc e02ddf54 e02ddf40 8025bc8c 80291138 df40: e02ddfb0 40000000 e02ddf84 e02ddf58 80221c2c 8025bc44 00000000 8341a10c df60: e02ddfb0 0013f390 ecac8b10 80221b80 00000000 8b5e415c e02ddfac 00000000 df80: 00000000 00356310 00000036 8020029c 877fa580 00000036 00000000 e02ddfa8 dfa0: 80200060 805f3adc 00000000 00000000 00000003 40946400 20000280 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fd70dc dfe0: 76fd6e88 76fd6e78 00018ff8 001311f0 60000010 00000003 00000000 00000000 Call trace: [<8155abf0>] (subdev_8255_io) from [<8155a92c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8535d480 r5:00003f00 r4:8155abf0 [<8155a8d4>] (subdev_8255_do_config) from [<8155ace4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8155a8d4>] (subdev_8255_do_config) from [<8155ace4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86ad1000 [<8155ac5c>] (subdev_8255_io_init) from [<8155ae94>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8155ac5c>] (subdev_8255_io_init) from [<8155ae94>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86ad1000 r5:00000000 r4:8535d480 [<8155ae20>] (dev_8255_attach) from [<8154988c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:83737400 r9:00000000 r8:8535d480 r7:e02ddd90 r6:00000000 r5:8535d480 r4:835dfbe8 [<81549784>] (comedi_device_attach) from [<815450a8>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:931) r10:877fa580 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8535d480 r4:20000280 [<81544fdc>] (do_devconfig_ioctl) from [<815463b8>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2303) r8:00000001 r7:40946400 r6:20000280 r5:8535d480 r4:845d0800 [<81546064>] (comedi_unlocked_ioctl) from [<805f3d14>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81546064>] (comedi_unlocked_ioctl) from [<805f3d14>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81546064>] (comedi_unlocked_ioctl) from [<805f3d14>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81546064>] (comedi_unlocked_ioctl) from [<805f3d14>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:877fa580 r9:00000003 r8:845d0800 r7:20000280 r6:40946400 r5:845d0801 r4:00000000 [<805f3ad0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe02ddfa8 to 0xe02ddff0) dfa0: 00000000 00000000 00000003 40946400 20000280 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fd70dc dfe0: 76fd6e88 76fd6e78 00018ff8 001311f0 r10:00000036 r9:877fa580 r8:8020029c r7:00000036 r6:00356310 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