8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f3a when write [fee04f3a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 22118 Comm: syz.8.4400 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 : ea9b9cb0 ip : ea9b9cb0 fp : ea9b9ccc r10: 00000001 r9 : 00000084 r8 : ea9b9d9c r7 : 00004f37 r6 : 0000009b r5 : 846ee180 r4 : 00004f3a r3 : 0000009b r2 : fee04f3a r1 : 00000001 r0 : 846ee180 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86c8ddc0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 846ee180 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 846ee180 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 0xea9b8000 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 0xea9b8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea9b8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.8.4400 (pid: 22118, stack limit = 0xea9b8000) Stack: (0xea9b9cb0 to 0xea9ba000) 9ca0: 8141713c 846ee180 00004f37 00004f37 9cc0: ea9b9cec ea9b9cd0 81416e74 81417148 00004f37 805153e4 84e60000 84e60000 9ce0: ea9b9d0c ea9b9cf0 81417234 81416e28 846ee180 00000000 84e60000 00004f37 9d00: ea9b9d4c ea9b9d10 814173e0 814171b4 8280ca60 84b63d00 828215b0 00000000 9d20: 00000000 829d46a0 846ee180 846ee1c4 ea9b9d88 846ee180 00000000 82b28ad8 9d40: ea9b9d84 ea9b9d50 81405f14 81417378 846ee1b0 00000000 ea9b9d74 200000c0 9d60: 846ee180 b5403587 846ee1b0 85bdd400 40946400 00000003 ea9b9e44 ea9b9d88 9d80: 8140186c 81405e18 35353238 00000000 00000000 00000000 00000000 00004f37 9da0: 00000005 00000002 00000401 00000001 00000cc7 00000fff 5c95239d 00000005 9dc0: 000003ff 00000802 00001600 00000001 00000001 00000009 0000e1cb 20000006 9de0: 00000004 00000003 00000395 40000005 fffffffd 00000001 fffffff5 ffffeadd 9e00: 00000003 0000003a 00000008 00000004 08000000 dffffffa 00000000 8810f576 9e20: 00000000 85e27e40 846ee180 200000c0 846ee1b0 85bdd400 ea9b9f14 ea9b9e48 9e40: 81402860 81401778 00000000 00000000 00000000 00000000 00000000 8810f576 9e60: 00000000 00000000 824a45ec 0000005f 84662448 00000064 84606f84 85bdd400 9e80: ea9b9ee4 ea9b9e90 807b85a8 807aeacc 00000064 00000001 00000000 ea9b9eac 9ea0: 85807790 834de7f8 00006400 0000000b ea9b9ea0 00000000 00000000 8810f576 9ec0: 85e27e40 40946400 200000c0 200000c0 85e27e40 00000003 ea9b9ef4 ea9b9ee8 9ee0: 807b86c8 8810f576 ea9b9f14 40946400 00000000 85e27e41 200000c0 85e27e40 9f00: 00000003 85bdd400 ea9b9fa4 ea9b9f18 80585b90 814022b0 ecac8b10 85bdd400 9f20: ea9b9f3c ea9b9f30 81ab1384 81ab1254 ea9b9f54 ea9b9f40 8025bcbc 8028e0c4 9f40: ea9b9fb0 40000000 ea9b9f84 ea9b9f58 80221a38 8025bc78 00000000 8281cf7c 9f60: ea9b9fb0 0014c8c0 ecac8b10 8022198c 00000000 8810f576 ea9b9fac 00000000 9f80: 00000000 00326310 00000036 8020029c 85bdd400 00000036 00000000 ea9b9fa8 9fa0: 80200060 80585a6c 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f4f0bc 9fe0: 76f4eec0 76f4eeb0 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) r7:00004f37 r6:00004f37 r5:846ee180 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) r4:84e60000 [<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) r7:00004f37 r6:84e60000 r5:00000000 r4:846ee180 [<8141736c>] (dev_8255_attach) from [<81405f14>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:846ee180 r7:ea9b9d88 r6:846ee1c4 r5:846ee180 r4:829d46a0 [<81405e0c>] (comedi_device_attach) from [<8140186c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85bdd400 r7:846ee1b0 r6:b5403587 r5:846ee180 r4:200000c0 [<8140176c>] (do_devconfig_ioctl) from [<81402860>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85bdd400 r7:846ee1b0 r6:200000c0 r5:846ee180 r4:85e27e40 [<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) r10:85bdd400 r9:00000003 r8:85e27e40 r7:200000c0 r6:85e27e41 r5:00000000 r4:40946400 [<80585a60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea9b9fa8 to 0xea9b9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f4f0bc 9fe0: 76f4eec0 76f4eeb0 000192bc 00132360 r10:00000036 r9:85bdd400 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