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: 5799 Comm: syz.0.532 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 : dfa59cb8 ip : dfa59cb8 fp : dfa59cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 84189b40 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84189b40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8556e3c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84189b40 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 84189b40 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 0xdfa58000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa58000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.532 (pid: 5799, stack limit = 0xdfa58000) Stack: (0xdfa59cb8 to 0xdfa5a000) 9ca0: 813b7eb0 84189b40 9cc0: 00004f27 00004f27 dfa59cf4 dfa59cd8 813b7be8 813b7ebc 00004f27 80503d54 9ce0: 85fc3000 85fc3000 dfa59d14 dfa59cf8 813b7fa8 813b7b9c 85fc3000 84189b40 9d00: dfa59da4 00004f27 dfa59d54 dfa59d18 813b819c 813b7f28 82ae3d60 8584d480 9d20: 82821598 00000000 00000000 829d0084 84189b40 84189b84 dfa59d90 84189b40 9d40: 00000000 82b16f00 dfa59d8c dfa59d58 813a70a0 813b80ec 200000c0 00000000 9d60: dfa59d7c 200000c0 84189b40 b5403587 200000c0 84bfec00 40946400 00000003 9d80: dfa59e4c dfa59d90 813a2c20 813a6fa4 35353238 00000000 00000000 00000000 9da0: 00000000 00004f27 00000005 00000002 00000401 00000001 00000cc7 00000fff 9dc0: 5c952399 00000005 000003ff 00000802 00001600 00000001 00000001 00000009 9de0: 0000e1cb 00000006 00000004 00000003 00000395 80000089 fffffffd 00000000 9e00: fffffff5 ffffeadb 00000003 0000003c 00000008 00000004 08000000 dffffffa 9e20: 00000000 29686b2d 00000000 866c23c0 84189b40 200000c0 200000c0 84bfec00 9e40: dfa59f14 dfa59e50 813a3bec 813a2b2c 00000000 00000000 00000000 29686b2d 9e60: 00000000 00000000 8247054c 0000005f 83b9c658 84189b70 841ac7a4 84bfec00 9e80: dfa59ee4 dfa59e90 8079795c 8078dcc0 00000064 00000001 00000000 dfa59eac 9ea0: 84ec7a90 834daa18 00006400 0000000b dfa59ea0 00000000 00000000 29686b2d 9ec0: 866c23c0 40946400 200000c0 200000c0 866c23c0 00000009 dfa59ef4 dfa59ee8 9ee0: 80797a7c 29686b2d dfa59f14 40946400 00000000 866c23c1 200000c0 866c23c0 9f00: 00000009 84bfec00 dfa59fa4 dfa59f18 8056cf18 813a361c ecac8b10 84bfec00 9f20: dfa59f3c dfa59f30 81a388b8 81a38788 dfa59f54 dfa59f40 8025e490 8028ef8c 9f40: dfa59fb0 40000000 dfa59f84 dfa59f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfa59fb0 0014c820 ecac8b10 80222940 00000000 29686b2d dfa59fac 00000000 9f80: 00000000 002f63a8 00000036 8020029c 84bfec00 00000036 00000000 dfa59fa8 9fa0: 80200060 8056cdf4 00000000 00000000 00000009 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f63a8 00000036 002e0000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 0001948c 001322c0 60000010 00000009 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 r5:84189b40 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) r4:85fc3000 [<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:dfa59da4 r5:84189b40 r4:85fc3000 [<813b80e0>] (dev_8255_attach) from [<813a70a0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r10:82b16f00 r9:00000000 r8:84189b40 r7:dfa59d90 r6:84189b84 r5:84189b40 r4:829d0084 [<813a6f98>] (comedi_device_attach) from [<813a2c20>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84bfec00 r7:200000c0 r6:b5403587 r5:84189b40 r4:200000c0 [<813a2b20>] (do_devconfig_ioctl) from [<813a3bec>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:84bfec00 r7:200000c0 r6:200000c0 r5:84189b40 r4:866c23c0 [<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) r10:84bfec00 r9:00000009 r8:866c23c0 r7:200000c0 r6:866c23c1 r5:00000000 r4:40946400 [<8056cde8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa59fa8 to 0xdfa59ff0) 9fa0: 00000000 00000000 00000009 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f63a8 00000036 002e0000 00000000 00006364 76f700bc 9fe0: 76f6fec0 76f6feb0 0001948c 001322c0 r10:00000036 r9:84bfec00 r8:8020029c r7:00000036 r6:002f63a8 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