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: 9542 Comm: syz.5.1102 Not tainted 6.17.0-rc1-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 : [<813b7f78>] lr : [<813b7f64>] psr: 60000013 sp : dfbb5cb8 ip : dfbb5cb8 fp : dfbb5cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 8414f240 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8414f240 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 857d3400 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8414f240 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 8414f240 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 0xdfbb4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfbb4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.5.1102 (pid: 9542, stack limit = 0xdfbb4000) Stack: (0xdfbb5cb8 to 0xdfbb6000) 5ca0: 813b7f18 8414f240 5cc0: 00004f27 00004f27 dfbb5cf4 dfbb5cd8 813b7c50 813b7f24 00004f27 80503c38 5ce0: 842eaa00 842eaa00 dfbb5d14 dfbb5cf8 813b8010 813b7c04 842eaa00 8414f240 5d00: dfbb5da4 00004f27 dfbb5d54 dfbb5d18 813b8204 813b7f90 82ae3d60 86281d00 5d20: 82821598 00000000 00000000 829d0084 8414f240 8414f284 dfbb5d90 8414f240 5d40: 00000000 82b16f00 dfbb5d8c dfbb5d58 813a7108 813b8154 200000c0 00000000 5d60: dfbb5d7c 200000c0 8414f240 b5403587 200000c0 85bea400 40946400 00000003 5d80: dfbb5e4c dfbb5d90 813a2c88 813a700c 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000008 00000002 00000000 00000001 00000cc7 00000fff 5dc0: 5c952399 00000005 000003ff 00000802 00001603 00000001 00000001 00000009 5de0: 0000e1cb 00000006 00000004 00000003 00000398 80000089 fffffffd 0000002f 5e00: fffffff5 00000001 00000003 0000003c 00000008 000007ff 08000000 dffffffc 5e20: 00000000 51dca779 00000000 857020c0 8414f240 200000c0 200000c0 85bea400 5e40: dfbb5f14 dfbb5e50 813a3c54 813a2b94 00000000 00000000 00000000 51dca779 5e60: 00000000 00000000 8247054c 0000005f 842be058 8414f270 8413699c 85bea400 5e80: dfbb5ee4 dfbb5e90 8079782c 8078db90 00000064 00000001 00000000 dfbb5eac 5ea0: 857df010 834ee550 00006400 0000000b dfbb5ea0 00000000 00000000 51dca779 5ec0: 857020c0 40946400 200000c0 200000c0 857020c0 00000003 dfbb5ef4 dfbb5ee8 5ee0: 8079794c 51dca779 dfbb5f14 40946400 00000000 857020c1 200000c0 857020c0 5f00: 00000003 85bea400 dfbb5fa4 dfbb5f18 8056ce00 813a3684 ecac8b10 85bea400 5f20: dfbb5f3c dfbb5f30 81a38e18 81a38ce8 dfbb5f54 dfbb5f40 8025e490 8028ef8c 5f40: dfbb5fb0 40000000 dfbb5f84 dfbb5f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfbb5fb0 0014c820 ecac8b10 80222940 00000000 51dca779 dfbb5fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 85bea400 00000036 00000000 dfbb5fa8 5fa0: 80200060 8056ccdc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f120bc 5fe0: 76f11ec0 76f11eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813b7f18>] (subdev_8255_io) from [<813b7c50>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:8414f240 r4:813b7f18 [<813b7bf8>] (subdev_8255_do_config) from [<813b8010>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b7bf8>] (subdev_8255_do_config) from [<813b8010>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:842eaa00 [<813b7f84>] (subdev_8255_io_init) from [<813b8204>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b7f84>] (subdev_8255_io_init) from [<813b8204>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfbb5da4 r5:8414f240 r4:842eaa00 [<813b8148>] (dev_8255_attach) from [<813a7108>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:8414f240 r7:dfbb5d90 r6:8414f284 r5:8414f240 r4:829d0084 [<813a7000>] (comedi_device_attach) from [<813a2c88>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85bea400 r7:200000c0 r6:b5403587 r5:8414f240 r4:200000c0 [<813a2b88>] (do_devconfig_ioctl) from [<813a3c54>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:85bea400 r7:200000c0 r6:200000c0 r5:8414f240 r4:857020c0 [<813a3678>] (comedi_unlocked_ioctl) from [<8056ce00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3678>] (comedi_unlocked_ioctl) from [<8056ce00>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3678>] (comedi_unlocked_ioctl) from [<8056ce00>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3678>] (comedi_unlocked_ioctl) from [<8056ce00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85bea400 r9:00000003 r8:857020c0 r7:200000c0 r6:857020c1 r5:00000000 r4:40946400 [<8056ccd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbb5fa8 to 0xdfbb5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f120bc 5fe0: 76f11ec0 76f11eb0 0001948c 001322c0 r10:00000036 r9:85bea400 r8:8020029c r7:00000036 r6:002f6308 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