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: 7647 Comm: syz.1.1053 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 : [<8141719c>] lr : [<81417188>] psr: 60000013 sp : df9f1cb0 ip : df9f1cb0 fp : df9f1ccc r10: 00000001 r9 : 00000084 r8 : df9f1d9c r7 : 00004f27 r6 : 0000009b r5 : 8455ca80 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8455ca80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85e71d00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8455ca80 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 8455ca80 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xdf9f0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf9f0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdf9f0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.1053 (pid: 7647, stack limit = 0xdf9f0000) Stack: (0xdf9f1cb0 to 0xdf9f2000) 1ca0: 8141713c 8455ca80 00004f27 00004f27 1cc0: df9f1cec df9f1cd0 81416e74 81417148 00004f27 df9f1cf0 81417234 85996000 1ce0: df9f1d0c df9f1cf0 81417234 81416e28 8455ca80 00000000 85996000 00004f27 1d00: df9f1d4c df9f1d10 814173e0 814171b4 8280ca60 84544900 828215b0 00000000 1d20: 00000000 829d46a0 8455ca80 8455cac4 df9f1d88 8455ca80 00000000 82b28ad8 1d40: df9f1d84 df9f1d50 81405f14 81417378 8455cab0 00000000 df9f1d74 200000c0 1d60: 8455ca80 b5403587 8455cab0 84526000 40946400 00000003 df9f1e44 df9f1d88 1d80: 8140186c 81405e18 35353238 00000000 00000000 00000000 00000000 00004f27 1da0: 00000005 00000002 00000401 00000001 00000cc7 00000fff 5c952399 00000005 1dc0: 000003ff 00000802 00001600 00000001 00000001 00000009 0000e1cb 00000006 1de0: 00000004 00000003 00000395 80000089 fffffffd 00000000 fffffff5 ffffeadb 1e00: 00000003 0000003c 00000008 00000004 08000000 dffffffa 00000000 8b614d32 1e20: 06200003 84da7600 8455ca80 200000c0 8455cab0 84526000 df9f1f14 df9f1e48 1e40: 81402860 81401778 00000000 00000000 00000000 00000000 00000000 8b614d32 1e60: 00000000 00000000 824a45ec 0000005f 841c0058 00000064 844de36c 84526000 1e80: df9f1ee4 df9f1e90 807b85a8 807aeacc 00000064 00000001 00000000 df9f1eac 1ea0: 84db2850 8342a990 00006400 0000000b df9f1ea0 00000000 00000000 8b614d32 1ec0: 84da7600 40946400 200000c0 200000c0 84da7600 00000003 df9f1ef4 df9f1ee8 1ee0: 807b86c8 8b614d32 df9f1f14 40946400 00000000 84da7601 200000c0 84da7600 1f00: 00000003 84526000 df9f1fa4 df9f1f18 80585b90 814022b0 ecac8b10 84526000 1f20: df9f1f3c df9f1f30 81ab1384 81ab1254 df9f1f54 df9f1f40 8025bcbc 8028e0c4 1f40: df9f1fb0 40000000 df9f1f84 df9f1f58 80221a38 8025bc78 00000000 8281cf7c 1f60: df9f1fb0 0014c8c0 ecac8b10 8022198c 00000000 8b614d32 df9f1fac 00000000 1f80: 00000000 00326310 00000036 8020029c 84526000 00000036 00000000 df9f1fa8 1fa0: 80200060 80585a6c 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f1c0bc 1fe0: 76f1bec0 76f1beb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<8141713c>] (subdev_8255_io) from [<81416e74>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8455ca80 r4:8141713c [<81416e1c>] (subdev_8255_do_config) from [<81417234>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81416e1c>] (subdev_8255_do_config) from [<81417234>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85996000 [<814171a8>] (subdev_8255_io_init) from [<814173e0>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<814171a8>] (subdev_8255_io_init) from [<814173e0>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:85996000 r5:00000000 r4:8455ca80 [<8141736c>] (dev_8255_attach) from [<81405f14>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:8455ca80 r7:df9f1d88 r6:8455cac4 r5:8455ca80 r4:829d46a0 [<81405e0c>] (comedi_device_attach) from [<8140186c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:84526000 r7:8455cab0 r6:b5403587 r5:8455ca80 r4:200000c0 [<8140176c>] (do_devconfig_ioctl) from [<81402860>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:84526000 r7:8455cab0 r6:200000c0 r5:8455ca80 r4:84da7600 [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814022a4>] (comedi_unlocked_ioctl) from [<80585b90>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84526000 r9:00000003 r8:84da7600 r7:200000c0 r6:84da7601 r5:00000000 r4:40946400 [<80585a60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9f1fa8 to 0xdf9f1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f1c0bc 1fe0: 76f1bec0 76f1beb0 000192bc 00132360 r10:00000036 r9:84526000 r8:8020029c r7:00000036 r6:00326310 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