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: 1 UID: 0 PID: 15967 Comm: syz.0.2809 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 : [<813db868>] lr : [<813db854>] psr: 60000013 sp : dfb09cb8 ip : dfb09cb8 fp : dfb09cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 842013c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 842013c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85568600 DAC: 00000000 Register r0 information: slab kmalloc-192 start 842013c0 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 842013c0 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 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.2809 (pid: 15967, stack limit = 0xdfb08000) Stack: (0xdfb09cb8 to 0xdfb0a000) 9ca0: 813db808 842013c0 9cc0: 00004f27 00004f27 dfb09cf4 dfb09cd8 813db540 813db814 00004f27 8050a88c 9ce0: 85b03000 85b03000 dfb09d14 dfb09cf8 813db900 813db4f4 85b03000 842013c0 9d00: dfb09da4 00004f27 dfb09d54 dfb09d18 813dbaf4 813db880 8079defc 84898580 9d20: 828215f0 00000000 00000000 829d23cc 842013c0 84201404 dfb09d90 842013c0 9d40: 00000000 82b25910 dfb09d8c dfb09d58 813ca9ec 813dba44 200000c0 00000000 9d60: dfb09d7c 200000c0 842013c0 b5403587 200000c0 84176c00 40946400 00000003 9d80: dfb09e4c dfb09d90 813c6538 813ca8f0 35353238 00000000 00000000 00000000 9da0: 00000000 00004f27 00000005 00000002 00000401 00000021 00000cc7 00000fff 9dc0: 5c952399 00000005 000003ff 00000000 00000005 00000001 00000000 00000009 9de0: 0000e1cb 00000004 00000004 00000003 00000395 80000089 00000002 00000000 9e00: 00000006 ffffeadb 00000003 80000000 00000008 80000001 08000000 00000005 9e20: 00000000 fdf00016 00000000 85d30240 842013c0 200000c0 200000c0 84176c00 9e40: dfb09f14 dfb09e50 813c7504 813c6444 00000000 dfb09e54 dfb09e54 fdf00016 9e60: 00000000 00000000 824625b4 0000005f 83da5210 842013f0 84213abc 84176c00 9e80: dfb09ee4 dfb09e90 807a7cbc 8079e0b4 00000064 00000001 00000000 dfb09eac 9ea0: 8523bc10 834f2aa0 00006400 0000000b dfb09ea0 00000000 dfb09d30 fdf00016 9ec0: 85d30240 40946400 200000c0 200000c0 85d30240 00000003 dfb09ef4 dfb09ee8 9ee0: 807a7ddc fdf00016 dfb09f14 40946400 00000000 85d30241 200000c0 85d30240 9f00: 00000003 84176c00 dfb09fa4 dfb09f18 80578ee0 813c6f34 ecac8b10 84176c00 9f20: dfb09f3c dfb09f30 81a60d80 81a60c50 dfb09f54 dfb09f40 8025c484 8028d914 9f40: dfb09fb0 40000000 dfb09f84 dfb09f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfb09fb0 0014ced0 ecac8b10 80222940 00000000 fdf00016 dfb09fac 00000000 9f80: 00000000 00316308 00000036 8020029c 84176c00 00000036 00000000 dfb09fa8 9fa0: 80200060 80578dbc 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f7d0bc 9fe0: 76f7cec0 76f7ceb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813db808>] (subdev_8255_io) from [<813db540>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:842013c0 r4:813db808 [<813db4e8>] (subdev_8255_do_config) from [<813db900>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db4e8>] (subdev_8255_do_config) from [<813db900>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85b03000 [<813db874>] (subdev_8255_io_init) from [<813dbaf4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813db874>] (subdev_8255_io_init) from [<813dbaf4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfb09da4 r5:842013c0 r4:85b03000 [<813dba38>] (dev_8255_attach) from [<813ca9ec>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:842013c0 r7:dfb09d90 r6:84201404 r5:842013c0 r4:829d23cc [<813ca8e4>] (comedi_device_attach) from [<813c6538>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84176c00 r7:200000c0 r6:b5403587 r5:842013c0 r4:200000c0 [<813c6438>] (do_devconfig_ioctl) from [<813c7504>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84176c00 r7:200000c0 r6:200000c0 r5:842013c0 r4:85d30240 [<813c6f28>] (comedi_unlocked_ioctl) from [<80578ee0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6f28>] (comedi_unlocked_ioctl) from [<80578ee0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6f28>] (comedi_unlocked_ioctl) from [<80578ee0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6f28>] (comedi_unlocked_ioctl) from [<80578ee0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84176c00 r9:00000003 r8:85d30240 r7:200000c0 r6:85d30241 r5:00000000 r4:40946400 [<80578db0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb09fa8 to 0xdfb09ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f7d0bc 9fe0: 76f7cec0 76f7ceb0 0001928c 00132970 r10:00000036 r9:84176c00 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