8<--- cut here --- Unable to handle kernel paging request at virtual address fee00143 when write [fee00143] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 18226 Comm: syz.5.3502 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 : [<814a1438>] lr : [<814a1424>] psr: 60000013 sp : dfdc5cb8 ip : dfdc5cb8 fp : dfdc5cd4 r10: 00000140 r9 : 00000004 r8 : dfdc5da4 r7 : 00000000 r6 : 0000009b r5 : 8315b0c0 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 8315b0c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85795d40 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8315b0c0 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 8315b0c0 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 0xdfdc4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfdc4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfdc4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.5.3502 (pid: 18226, stack limit = 0xdfdc4000) Stack: (0xdfdc5cb8 to 0xdfdc6000) 5ca0: 814a13d8 00000140 5cc0: 8315b0c0 00000000 dfdc5cf4 dfdc5cd8 814a1114 814a13e4 00000140 80546240 5ce0: 86a0b000 86a0b000 dfdc5d14 dfdc5cf8 814a14cc 814a10c8 8315b0c0 00000000 5d00: 86a0b000 00000000 dfdc5d54 dfdc5d18 814a167c 814a1450 ffffffff 00000004 5d20: 82a22dc0 00000000 00000000 82bd965c 8315b0c0 00000000 dfdc5d90 8315b0c0 5d40: 00000000 82d30dfc dfdc5d8c dfdc5d58 81490020 814a1614 40946400 00000000 5d60: dfdc5d7c 200003c0 8315b0c0 b5403587 40946400 00000002 00000003 8402d5c0 5d80: dfdc5e4c dfdc5d90 8148b824 8148ff24 35353238 00000000 00000000 00000000 5da0: 00000000 00000140 fffffffc 0000000d 00000006 00000206 00000004 00010005 5dc0: 40000006 00004007 00000010 00000005 00000005 00000003 0000000d 00000087 5de0: 00009e9b 00000101 00000008 00000006 00000009 ffffffff 00000461 0000000a 5e00: 00000009 00000ffd 00000008 00000008 00000003 00000283 00008001 00000005 5e20: 00000000 527d468c 00000000 838dcf00 8315b0c0 200003c0 40946400 00000002 5e40: dfdc5f14 dfdc5e50 8148cb4c 8148b764 00000000 527d468c 00000000 00000000 5e60: 82549844 dfdc5ea4 0000005f 8457ed40 00000064 8315b0f0 dfdc5ee4 dfdc5e88 5e80: 80806254 807fc90c 00000064 00000001 00000000 dfdc5ea4 86636110 834e43b8 5ea0: 00006400 0000000b dfdc5e98 00000000 00000000 527d468c 00000000 838dcf00 5ec0: 40946400 200003c0 200003c0 838dcf00 00000003 8402d5c0 dfdc5ef4 dfdc5ee8 5ee0: 80806388 527d468c dfdc5f14 00000000 838dcf01 40946400 200003c0 838dcf00 5f00: 00000003 8402d5c0 dfdc5fa4 dfdc5f18 805baefc 8148c804 ecac8b10 8402d5c0 5f20: dfdc5f3c dfdc5f30 81b5a560 81b5a42c dfdc5f54 dfdc5f40 8025a7a8 8028e490 5f40: dfdc5fb0 40000000 dfdc5f84 dfdc5f58 80220bdc 8025a764 00000000 82a1eb0c 5f60: dfdc5fb0 0013ea70 ecac8b10 80220b30 00000000 527d468c dfdc5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 8402d5c0 00000036 00000000 dfdc5fa8 5fa0: 80200060 805bacc4 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f810dc 5fe0: 76f80e88 76f80e78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<814a13d8>] (subdev_8255_io) from [<814a1114>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8315b0c0 r5:00000140 r4:814a13d8 [<814a10bc>] (subdev_8255_do_config) from [<814a14cc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a10bc>] (subdev_8255_do_config) from [<814a14cc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86a0b000 [<814a1444>] (subdev_8255_io_init) from [<814a167c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a1444>] (subdev_8255_io_init) from [<814a167c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:86a0b000 r5:00000000 r4:8315b0c0 [<814a1608>] (dev_8255_attach) from [<81490020>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8315b0c0 r7:dfdc5d90 r6:00000000 r5:8315b0c0 r4:82bd965c [<8148ff18>] (comedi_device_attach) from [<8148b824>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8402d5c0 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8315b0c0 r4:200003c0 [<8148b758>] (do_devconfig_ioctl) from [<8148cb4c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:8315b0c0 r4:838dcf00 [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148c7f8>] (comedi_unlocked_ioctl) from [<805baefc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8402d5c0 r9:00000003 r8:838dcf00 r7:200003c0 r6:40946400 r5:838dcf01 r4:00000000 [<805bacb8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdc5fa8 to 0xdfdc5ff0) 5fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f810dc 5fe0: 76f80e88 76f80e78 00018ebc 001308d0 r10:00000036 r9:8402d5c0 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