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: 0 UID: 0 PID: 13372 Comm: syz.3.1792 Not tainted 6.16.0-rc5-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 : [<81398300>] lr : [<813982f0>] psr: 60000013 sp : dfa31d38 ip : dfa31d38 fp : dfa31d5c r10: 82b15078 r9 : 00000003 r8 : 83fe93c0 r7 : dfa31d98 r6 : 83fe93c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e14f0c r1 : 00000001 r0 : 81397f70 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 844a4280 DAC: fffffffd 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 83fe93c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa30000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 83fe93c0 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 0xdfa30000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfa30000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.3.1792 (pid: 13372, stack limit = 0xdfa30000) Stack: (0xdfa31d38 to 0xdfa32000) 1d20: 823f8db8 83fe93c0 1d40: 829c4c58 829c4c58 81e153cc 00000000 dfa31d94 dfa31d60 813943b8 81398198 1d60: 200000c0 00000000 dfa31d84 200000c0 83fe93c0 b5403587 200000c0 84140c00 1d80: 40946400 00000003 dfa31e4c dfa31d98 81390048 813942c0 656d6f63 705f6964 1da0: 6f707261 00007472 00000000 00004f27 00000005 00000004 00000004 00000005 1dc0: 00000006 00000006 00000007 0000000a 00000100 00000002 00080000 00000001 1de0: 00000008 0000001e 00000001 00000000 0001a449 00000003 00000006 00000081 1e00: 0000caa7 00000004 00001e58 0000000b 00000003 0000003c 00000008 00000006 1e20: 00000000 00000005 00000000 5a761f67 00000000 848a4f00 83fe93c0 200000c0 1e40: dfa31f14 dfa31e50 81390ffc 8138ff7c 00000000 00000000 00000000 5a761f67 1e60: 00000000 00000000 8246a3fc 0000005f 83bc1458 83fe93f0 8400c99c 84140c00 1e80: dfa31ee4 dfa31e90 80795d4c 8078c03c 00000064 00000001 00000000 dfa31eac 1ea0: 85cfe610 83424198 00006400 0000000b dfa31ea0 00000000 00000000 5a761f67 1ec0: 848a4f00 40946400 200000c0 200000c0 00000003 848a4f00 dfa31ef4 dfa31ee8 1ee0: 80795e6c 5a761f67 dfa31f14 40946400 00000000 848a4f01 200000c0 00000003 1f00: 848a4f00 84140c00 dfa31fa4 dfa31f18 8056e2ec 81390a2c ecac8b10 84140c00 1f20: dfa31f3c dfa31f30 81a2d68c 81a2d55c dfa31f54 dfa31f40 80261ffc 80293598 1f40: dfa31fb0 40000000 dfa31f84 dfa31f58 802229ec 80261fb8 00000000 8281d09c 1f60: dfa31fb0 0014c4a0 ecac8b10 80222940 00000000 5a761f67 dfa31fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 84140c00 00000036 00000000 dfa31fa8 1fa0: 80200060 8056e1c8 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bb00bc 1fe0: 76bafec0 76bafeb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<8139818c>] (parport_attach) from [<813943b8>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r6:00000000 r5:81e153cc r4:829c4c58 [<813942b4>] (comedi_device_attach) from [<81390048>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:84140c00 r7:200000c0 r6:b5403587 r5:83fe93c0 r4:200000c0 [<8138ff70>] (do_devconfig_ioctl) from [<81390ffc>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200000c0 r5:83fe93c0 r4:848a4f00 [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:84140c00 r9:848a4f00 r8:00000003 r7:200000c0 r6:848a4f01 r5:00000000 r4:40946400 [<8056e1bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa31fa8 to 0xdfa31ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bb00bc 1fe0: 76bafec0 76bafeb0 000193a4 00131f40 r10:00000036 r9:84140c00 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