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: 23616 Comm: syz.2.5394 Not tainted syzkaller #0 PREEMPT 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 : [<813dbd88>] lr : [<813dbd74>] psr: 60000013 sp : ea755cb8 ip : ea755cb8 fp : ea755cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 841c8540 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 841c8540 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85d6e500 DAC: fffffffd Register r0 information: slab kmalloc-192 start 841c8540 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 841c8540 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: non-paged memory Register r9 information: NULL pointer Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xea754000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xea754000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.2.5394 (pid: 23616, stack limit = 0xea754000) Stack: (0xea755cb8 to 0xea756000) 5ca0: 813dbd28 841c8540 5cc0: 00004f27 00004f27 ea755cf4 ea755cd8 813dba60 813dbd34 00004f27 8050a7ec 5ce0: 85fa5800 85fa5800 ea755d14 ea755cf8 813dbe20 813dba14 85fa5800 841c8540 5d00: ea755da4 00004f27 ea755d54 ea755d18 813dc014 813dbda0 81a6e158 833dcf00 5d20: 828215f0 00000000 00000000 829d23cc 841c8540 841c8584 ea755d90 841c8540 5d40: 00000000 82b25910 ea755d8c ea755d58 813caf0c 813dbf64 200000c0 00000000 5d60: ea755d7c 200000c0 841c8540 b5403587 200000c0 8412a400 40946400 00000003 5d80: ea755e4c ea755d90 813c6a58 813cae10 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000003 00000002 00000480 00000004 00000cc7 000000c9 5dc0: 5c952399 00000005 000003ff 00000802 00001604 00000001 00000006 00000009 5de0: 00000000 00000f53 00000004 00000003 00000002 00000000 fffffffd fffffffd 5e00: fffffff5 ffffeadb 00000003 00000002 00000008 00000000 08000000 00000003 5e20: 00000000 27c1574a 06200003 86364f00 841c8540 200000c0 200000c0 8412a400 5e40: ea755f14 ea755e50 813c7a24 813c6964 00000000 00000000 00000000 27c1574a 5e60: 00000000 00000000 824625b4 0000005f 83dd4640 841c8570 841f0954 8412a400 5e80: ea755ee4 ea755e90 807a7a38 8079e184 00000064 00000001 00000000 ea755eac 5ea0: 86200910 83433880 00006400 0000000b ea755ea0 00000000 ea755d30 27c1574a 5ec0: 86364f00 40946400 200000c0 200000c0 86364f00 00000003 ea755ef4 ea755ee8 5ee0: 807a7b58 27c1574a ea755f14 40946400 00000000 86364f01 200000c0 86364f00 5f00: 00000003 8412a400 ea755fa4 ea755f18 80578ef0 813c7454 ecac8b10 8412a400 5f20: ea755f3c ea755f30 81a61880 81a61750 ea755f54 ea755f40 8025c484 8028d914 5f40: ea755fb0 40000000 ea755f84 ea755f58 802229ec 8025c440 00000000 8281cfb4 5f60: ea755fb0 0014ced0 ecac8b10 80222940 00000000 27c1574a ea755fac 00000000 5f80: 00000000 00316308 00000036 8020029c 8412a400 00000036 00000000 ea755fa8 5fa0: 80200060 80578dcc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f690bc 5fe0: 76f68ec0 76f68eb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813dbd28>] (subdev_8255_io) from [<813dba60>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:841c8540 r4:813dbd28 [<813dba08>] (subdev_8255_do_config) from [<813dbe20>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813dba08>] (subdev_8255_do_config) from [<813dbe20>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85fa5800 [<813dbd94>] (subdev_8255_io_init) from [<813dc014>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbd94>] (subdev_8255_io_init) from [<813dc014>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:ea755da4 r5:841c8540 r4:85fa5800 [<813dbf58>] (dev_8255_attach) from [<813caf0c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:841c8540 r7:ea755d90 r6:841c8584 r5:841c8540 r4:829d23cc [<813cae04>] (comedi_device_attach) from [<813c6a58>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8412a400 r7:200000c0 r6:b5403587 r5:841c8540 r4:200000c0 [<813c6958>] (do_devconfig_ioctl) from [<813c7a24>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8412a400 r7:200000c0 r6:200000c0 r5:841c8540 r4:86364f00 [<813c7448>] (comedi_unlocked_ioctl) from [<80578ef0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c7448>] (comedi_unlocked_ioctl) from [<80578ef0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c7448>] (comedi_unlocked_ioctl) from [<80578ef0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c7448>] (comedi_unlocked_ioctl) from [<80578ef0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8412a400 r9:00000003 r8:86364f00 r7:200000c0 r6:86364f01 r5:00000000 r4:40946400 [<80578dc0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea755fa8 to 0xea755ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f690bc 5fe0: 76f68ec0 76f68eb0 00019294 00132970 r10:00000036 r9:8412a400 r8:8020029c r7:00000036 r6:00316308 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