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: 8520 Comm: syz.1.1127 Not tainted 6.16.0-rc7-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 : [<8139f128>] lr : [<8139f114>] psr: 60000013 sp : dfb6dcc0 ip : dfb6dcc0 fp : dfb6dcdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 841083c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 841083c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85c110c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 841083c0 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 841083c0 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 0xdfb6c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfb6c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.1127 (pid: 8520, stack limit = 0xdfb6c000) Stack: (0xdfb6dcc0 to 0xdfb6e000) dcc0: 8139f0c8 841083c0 00004f27 00004f27 dfb6dcfc dfb6dce0 8139ee00 8139f0d4 dce0: 00004f27 80500f20 854e5c00 854e5c00 dfb6dd1c dfb6dd00 8139f1c0 8139edb4 dd00: 854e5c00 841083c0 dfb6ddac 00004f27 dfb6dd5c dfb6dd20 8139f3b4 8139f140 dd20: 00000013 83379900 82822670 00000000 00000000 829c53b0 841083c0 00000000 dd40: dfb6dd98 841083c0 00000000 82b14ef8 dfb6dd94 dfb6dd60 8138e2c4 8139f304 dd60: 200000c0 00000000 dfb6dd84 200000c0 841083c0 b5403587 200000c0 85cdb000 dd80: 40946400 00000003 dfb6de4c dfb6dd98 81389e90 8138e1cc 35353238 00000000 dda0: 00000000 00000000 00000000 00004f27 00000005 00000002 00000401 00000000 ddc0: 00000cc7 00000fff 00000004 00000005 000003ff 00000802 00001600 04000001 dde0: 00000000 00000080 0000e1cb 00000006 00000004 00000003 00000395 80000089 de00: fffffffd 00000000 00000006 fdffeadb 00000004 0001003c 00000008 00000004 de20: 08000000 00000005 00000000 f4b8ecd3 00000000 8491c780 841083c0 200000c0 de40: dfb6df14 dfb6de50 8138ae44 81389dc4 00000000 00000000 00000000 f4b8ecd3 de60: 00000000 00000000 824693fc 0000005f 84059e58 841083f0 841c2cb4 85cdb000 de80: dfb6dee4 dfb6de90 8078f7bc 80785aac 00000064 00000001 00000000 dfb6deac dea0: 85bc4cd0 8343b6e8 00006400 0000000b dfb6dea0 00000000 00000000 f4b8ecd3 dec0: 8491c780 40946400 200000c0 200000c0 00000003 8491c780 dfb6def4 dfb6dee8 dee0: 8078f8dc f4b8ecd3 dfb6df14 40946400 00000000 8491c781 200000c0 00000003 df00: 8491c780 85cdb000 dfb6dfa4 dfb6df18 805679c4 8138a874 ecac8b10 85cdb000 df20: dfb6df3c dfb6df30 81a24b4c 81a24a1c dfb6df54 dfb6df40 80261ffc 80293598 df40: dfb6dfb0 40000000 dfb6df84 dfb6df58 802229ec 80261fb8 00000000 8281d09c df60: dfb6dfb0 0014c520 ecac8b10 80222940 00000000 f4b8ecd3 dfb6dfac 00000000 df80: 00000000 002f6300 00000036 8020029c 85cdb000 00000036 00000000 dfb6dfa8 dfa0: 80200060 805678a0 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b210bc dfe0: 76b20ec0 76b20eb0 000193a4 00131fc0 60000010 00000003 00000000 00000000 Call trace: [<8139f0c8>] (subdev_8255_io) from [<8139ee00>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:841083c0 r4:8139f0c8 [<8139eda8>] (subdev_8255_do_config) from [<8139f1c0>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8139eda8>] (subdev_8255_do_config) from [<8139f1c0>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:854e5c00 [<8139f134>] (subdev_8255_io_init) from [<8139f3b4>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<8139f134>] (subdev_8255_io_init) from [<8139f3b4>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfb6ddac r5:841083c0 r4:854e5c00 [<8139f2f8>] (dev_8255_attach) from [<8138e2c4>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:999) r10:82b14ef8 r9:00000000 r8:841083c0 r7:dfb6dd98 r6:00000000 r5:841083c0 r4:829c53b0 [<8138e1c0>] (comedi_device_attach) from [<81389e90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:85cdb000 r7:200000c0 r6:b5403587 r5:841083c0 r4:200000c0 [<81389db8>] (do_devconfig_ioctl) from [<8138ae44>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2156) r6:200000c0 r5:841083c0 r4:8491c780 [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<8138a868>] (comedi_unlocked_ioctl) from [<805679c4>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:85cdb000 r9:8491c780 r8:00000003 r7:200000c0 r6:8491c781 r5:00000000 r4:40946400 [<80567894>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb6dfa8 to 0xdfb6dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b210bc dfe0: 76b20ec0 76b20eb0 000193a4 00131fc0 r10:00000036 r9:85cdb000 r8:8020029c r7:00000036 r6:002f6300 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