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: 11748 Comm: syz.1.2004 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 : [<813b7f10>] lr : [<813b7efc>] psr: 60000013 sp : dfa75cb8 ip : dfa75cb8 fp : dfa75cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 83feb600 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 83feb600 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85ba2140 DAC: fffffffd Register r0 information: slab kmalloc-192 start 83feb600 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 83feb600 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 0xdfa74000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa74000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.2004 (pid: 11748, stack limit = 0xdfa74000) Stack: (0xdfa75cb8 to 0xdfa76000) 5ca0: 813b7eb0 83feb600 5cc0: 00004f27 00004f27 dfa75cf4 dfa75cd8 813b7be8 813b7ebc 00004f27 80503d54 5ce0: 849b5800 849b5800 dfa75d14 dfa75cf8 813b7fa8 813b7b9c 849b5800 83feb600 5d00: dfa75da4 00004f27 dfa75d54 dfa75d18 813b819c 813b7f28 82ae3d60 832acf80 5d20: 82821598 00000000 00000000 829d0084 83feb600 83feb644 dfa75d90 83feb600 5d40: 00000000 82b16f00 dfa75d8c dfa75d58 813a70a0 813b80ec 200000c0 00000000 5d60: dfa75d7c 200000c0 83feb600 b5403587 200000c0 848d0c00 40946400 00000003 5d80: dfa75e4c dfa75d90 813a2c20 813a6fa4 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000002 00000fff 5dc0: 5c952399 00000005 000003ff 00000000 00001600 00000001 00000000 00000009 5de0: 0000e1cb 00000006 00000004 00000003 00000007 80000089 fffffffd 00000000 5e00: 00000006 ffffeadb 00000003 0001003c 00000008 00000004 08000000 00000005 5e20: 00000000 9dac472f 00000000 85591180 83feb600 200000c0 200000c0 848d0c00 5e40: dfa75f14 dfa75e50 813a3bec 813a2b2c 00000000 00000000 00000000 9dac472f 5e60: 00000000 00000000 8247054c 0000005f 83d37e58 83feb630 8406bdd4 848d0c00 5e80: dfa75ee4 dfa75e90 8079795c 8078dcc0 00000064 00000001 00000000 dfa75eac 5ea0: 85b99910 83431088 00006400 0000000b dfa75ea0 00000000 00000000 9dac472f 5ec0: 85591180 40946400 200000c0 200000c0 85591180 00000007 dfa75ef4 dfa75ee8 5ee0: 80797a7c 9dac472f dfa75f14 40946400 00000000 85591181 200000c0 85591180 5f00: 00000007 848d0c00 dfa75fa4 dfa75f18 8056cf18 813a361c ecac8b10 848d0c00 5f20: dfa75f3c dfa75f30 81a388b8 81a38788 dfa75f54 dfa75f40 8025e490 8028ef8c 5f40: dfa75fb0 40000000 dfa75f84 dfa75f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfa75fb0 0014c820 ecac8b10 80222940 00000000 9dac472f dfa75fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 848d0c00 00000036 00000000 dfa75fa8 5fa0: 80200060 8056cdf4 00000000 00000000 00000007 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f320bc 5fe0: 76f31ec0 76f31eb0 0001948c 001322c0 60000010 00000007 00000000 00000000 Call trace: [<813b7eb0>] (subdev_8255_io) from [<813b7be8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:83feb600 r4:813b7eb0 [<813b7b90>] (subdev_8255_do_config) from [<813b7fa8>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813b7b90>] (subdev_8255_do_config) from [<813b7fa8>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:849b5800 [<813b7f1c>] (subdev_8255_io_init) from [<813b819c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813b7f1c>] (subdev_8255_io_init) from [<813b819c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfa75da4 r5:83feb600 r4:849b5800 [<813b80e0>] (dev_8255_attach) from [<813a70a0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:83feb600 r7:dfa75d90 r6:83feb644 r5:83feb600 r4:829d0084 [<813a6f98>] (comedi_device_attach) from [<813a2c20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:848d0c00 r7:200000c0 r6:b5403587 r5:83feb600 r4:200000c0 [<813a2b20>] (do_devconfig_ioctl) from [<813a3bec>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:848d0c00 r7:200000c0 r6:200000c0 r5:83feb600 r4:85591180 [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3610>] (comedi_unlocked_ioctl) from [<8056cf18>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:848d0c00 r9:00000007 r8:85591180 r7:200000c0 r6:85591181 r5:00000000 r4:40946400 [<8056cde8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa75fa8 to 0xdfa75ff0) 5fa0: 00000000 00000000 00000007 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f320bc 5fe0: 76f31ec0 76f31eb0 0001948c 001322c0 r10:00000036 r9:848d0c00 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