8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4845 Comm: syz.0.12377 Not tainted 6.16.0-rc4-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81398bc8>] lr : [<81398bb8>] psr: 60000013 sp : dfad9d38 ip : dfad9d38 fp : dfad9d5c r10: 82b15078 r9 : 00000003 r8 : 83c560c0 r7 : dfad9d98 r6 : 83c560c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e14f2c r1 : 00000001 r0 : 81398838 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 856e4b80 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 83c560c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfad8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 83c560c0 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfad8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfad8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.12377 (pid: 4845, stack limit = 0xdfad8000) Stack: (0xdfad9d38 to 0xdfada000) 9d20: 823f893c 83c560c0 9d40: dfad9d60 829c4b18 81e153ec 00000000 dfad9d94 dfad9d60 81394c80 81398a60 9d60: 200000c0 00000000 dfad9d84 200000c0 83c560c0 b5403587 200000c0 85410000 9d80: 40946400 00000003 dfad9e4c dfad9d98 81390910 81394b88 656d6f63 705f6964 9da0: 6f707261 00007472 00000000 00004f27 00000005 00000004 00000004 00000005 9dc0: 00000006 00000006 00000007 0000000a 00000100 00000002 00080000 00000001 9de0: 00000008 0000001e 00000001 00000000 0001a449 00000003 00000006 00000081 9e00: 0000caa7 00000004 00001e58 0000000b 00000003 0000003c 00000008 00000006 9e20: 00000000 00000005 00000000 fa494828 00000000 833e9c00 83c560c0 200000c0 9e40: dfad9f14 dfad9e50 813918c4 81390844 00000000 00000000 00000000 fa494828 9e60: 00000000 00000000 8246a3fc 0000005f 83ccb058 83c560f0 83c1eb04 85410000 9e80: dfad9ee4 dfad9e90 8079688c 8078cb7c 00000064 00000001 00000000 dfad9eac 9ea0: 857f40d0 8342dee0 00006400 0000000b dfad9ea0 00000000 dfad9d30 fa494828 9ec0: 833e9c00 40946400 200000c0 200000c0 00000003 833e9c00 dfad9ef4 dfad9ee8 9ee0: 807969ac fa494828 dfad9f14 40946400 00000000 833e9c01 200000c0 00000003 9f00: 833e9c00 85410000 dfad9fa4 dfad9f18 8056f16c 813912f4 ecac8b10 85410000 9f20: dfad9f3c dfad9f30 81a2db88 81a2da58 dfad9f54 dfad9f40 8026203c 802935d8 9f40: dfad9fb0 40000000 dfad9f84 dfad9f58 802229ec 80261ff8 00000000 8281d09c 9f60: dfad9fb0 0014c4a0 ecac8b10 80222940 00000000 fa494828 dfad9fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 85410000 00000036 00000000 dfad9fa8 9fa0: 80200060 8056f048 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bd40bc 9fe0: 76bd3ec0 76bd3eb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<81398a54>] (parport_attach) from [<81394c80>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r6:00000000 r5:81e153ec r4:829c4b18 [<81394b7c>] (comedi_device_attach) from [<81390910>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:85410000 r7:200000c0 r6:b5403587 r5:83c560c0 r4:200000c0 [<81390838>] (do_devconfig_ioctl) from [<813918c4>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200000c0 r5:83c560c0 r4:833e9c00 [<813912e8>] (comedi_unlocked_ioctl) from [<8056f16c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813912e8>] (comedi_unlocked_ioctl) from [<8056f16c>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<813912e8>] (comedi_unlocked_ioctl) from [<8056f16c>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<813912e8>] (comedi_unlocked_ioctl) from [<8056f16c>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:85410000 r9:833e9c00 r8:00000003 r7:200000c0 r6:833e9c01 r5:00000000 r4:40946400 [<8056f03c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfad9fa8 to 0xdfad9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bd40bc 9fe0: 76bd3ec0 76bd3eb0 000193a4 00131f40 r10:00000036 r9:85410000 r8:8020029c r7:00000036 r6:002f6300 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction