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: 9411 Comm: syz.7.8460 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 : [<81465558>] lr : [<81465544>] psr: 60000013 sp : e015dcb8 ip : e015dcb8 fp : e015dcd4 r10: 00001000 r9 : 00000004 r8 : e015dda4 r7 : 00000000 r6 : 0000009b r5 : 8334b0c0 r4 : 00001003 r3 : 0000009b r2 : fee01003 r1 : 00000001 r0 : 8334b0c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86b5be40 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8334b0c0 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 8334b0c0 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 0xe015c000 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 0xe015c000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xe015c000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.7.8460 (pid: 9411, stack limit = 0xe015c000) Stack: (0xe015dcb8 to 0xe015e000) dca0: 814654f8 00001000 dcc0: 8334b0c0 00000000 e015dcf4 e015dcd8 81465234 81465504 00001000 805320dc dce0: 867db800 867db800 e015dd14 e015dcf8 814655ec 814651e8 8334b0c0 00000000 dd00: 867db800 00000000 e015dd54 e015dd18 8146579c 81465570 ffffffff 00000004 dd20: 82a205c0 00000000 00000000 82bd2f5c 8334b0c0 00000000 e015dd90 8334b0c0 dd40: 00000000 82d2bdc4 e015dd8c e015dd58 81454124 81465734 40946400 00000000 dd60: e015dd7c 20000380 8334b0c0 b5403587 40946400 00000001 00000005 85d70c40 dd80: e015de4c e015dd90 8144f930 81454028 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 7e366db6 00000000 868d5600 8334b0c0 20000380 40946400 00000001 de40: e015df14 e015de50 81450c54 8144f868 00000000 7e366db6 00000000 00000000 de60: 82530804 e015dea4 0000005f 84407c00 00000064 8334b0f0 e015dee4 e015de88 de80: 807e8ff0 807df304 00000064 00000001 00000000 e015dea4 8c8233d0 834eb880 dea0: 00006400 0000000b e015de98 00000000 00000000 7e366db6 00000000 868d5600 dec0: 40946400 20000380 20000380 868d5600 00000005 85d70c40 e015def4 e015dee8 dee0: 807e9124 7e366db6 e015df14 00000000 868d5601 40946400 20000380 868d5600 df00: 00000005 85d70c40 e015dfa4 e015df18 805a16e0 8145090c ecac8b10 85d70c40 df20: e015df3c e015df30 81b15274 81b15140 e015df54 e015df40 8025a664 8028e168 df40: e015dfb0 40000000 e015df84 e015df58 80220be0 8025a620 00000000 82a1c2fc df60: e015dfb0 0013e940 ecac8b10 80220b34 00000000 7e366db6 e015dfac 00000000 df80: 00000000 00346310 00000036 8020029c 85d70c40 00000036 00000000 e015dfa8 dfa0: 80200060 805a14a8 00000000 00000000 00000005 40946400 20000380 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff00dc dfe0: 76fefe88 76fefe78 00018e58 001307a0 60000010 00000005 00000000 00000000 Call trace: [<814654f8>] (subdev_8255_io) from [<81465234>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8334b0c0 r5:00001000 r4:814654f8 [<814651dc>] (subdev_8255_do_config) from [<814655ec>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814651dc>] (subdev_8255_do_config) from [<814655ec>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:867db800 [<81465564>] (subdev_8255_io_init) from [<8146579c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81465564>] (subdev_8255_io_init) from [<8146579c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:867db800 r5:00000000 r4:8334b0c0 [<81465728>] (dev_8255_attach) from [<81454124>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2bdc4 r9:00000000 r8:8334b0c0 r7:e015dd90 r6:00000000 r5:8334b0c0 r4:82bd2f5c [<8145401c>] (comedi_device_attach) from [<8144f930>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:85d70c40 r9:00000005 r8:00000001 r7:40946400 r6:b5403587 r5:8334b0c0 r4:20000380 [<8144f85c>] (do_devconfig_ioctl) from [<81450c54>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000380 r5:8334b0c0 r4:868d5600 [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81450900>] (comedi_unlocked_ioctl) from [<805a16e0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85d70c40 r9:00000005 r8:868d5600 r7:20000380 r6:40946400 r5:868d5601 r4:00000000 [<805a149c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe015dfa8 to 0xe015dff0) dfa0: 00000000 00000000 00000005 40946400 20000380 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff00dc dfe0: 76fefe88 76fefe78 00018e58 001307a0 r10:00000036 r9:85d70c40 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