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: 7104 Comm: syz.6.236 Not tainted 6.16.0-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 : [<813aaad0>] lr : [<813aaac0>] psr: 60000013 sp : dfb09d30 ip : dfb09d30 fp : dfb09d54 r10: 82b16f00 r9 : 00000003 r8 : 84158900 r7 : dfb09d90 r6 : 84158900 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15424 r1 : 00000001 r0 : 813aa740 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85beb080 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 84158900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84158900 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 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.6.236 (pid: 7104, stack limit = 0xdfb08000) Stack: (0xdfb09d30 to 0xdfb0a000) 9d20: dfb09d4c dfb09d40 829cf8ec 829cf8ec 9d40: 81e158e4 84158944 dfb09d8c dfb09d58 813a6b6c 813aa968 200000c0 00000000 9d60: dfb09d7c 200000c0 84158900 b5403587 200000c0 83b38000 40946400 00000003 9d80: dfb09e4c dfb09d90 813a26ec 813a6a70 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00000000 00000004 00000007 00000005 00000005 00000004 9dc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000001 00000001 00000006 9de0: 00000101 00000000 0000007f 00000007 40000001 00000005 0000caa3 00000000 9e00: 20001e5b 00000000 00000e66 00000003 00000008 00004086 00000000 fffffff8 9e20: 00000000 4ee5308d 00000000 8554a780 84158900 200000c0 200000c0 83b38000 9e40: dfb09f14 dfb09e50 813a36b8 813a25f8 00000000 00000000 00000000 4ee5308d 9e60: 00000000 00000000 8247054c 0000005f 83fb1a58 84158930 84189204 83b38000 9e80: dfb09ee4 dfb09e90 80797804 8078db68 00000064 00000001 00000000 dfb09eac 9ea0: 85888910 8342b440 00006400 0000000b dfb09ea0 00000000 00000000 4ee5308d 9ec0: 8554a780 40946400 200000c0 200000c0 8554a780 00000003 dfb09ef4 dfb09ee8 9ee0: 80797924 4ee5308d dfb09f14 40946400 00000000 8554a781 200000c0 8554a780 9f00: 00000003 83b38000 dfb09fa4 dfb09f18 8056ce5c 813a30e8 ecac8b10 83b38000 9f20: dfb09f3c dfb09f30 81a382b8 81a38188 dfb09f54 dfb09f40 8025e490 8028ef8c 9f40: dfb09fb0 40000000 dfb09f84 dfb09f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfb09fb0 0014c820 ecac8b10 80222940 00000000 4ee5308d dfb09fac 00000000 9f80: 00000000 002f6308 00000036 8020029c 83b38000 00000036 00000000 dfb09fa8 9fa0: 80200060 8056cd38 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76ff20bc 9fe0: 76ff1ec0 76ff1eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aa95c>] (parport_attach) from [<813a6b6c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:84158944 r5:81e158e4 r4:829cf8ec [<813a6a64>] (comedi_device_attach) from [<813a26ec>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b38000 r7:200000c0 r6:b5403587 r5:84158900 r4:200000c0 [<813a25ec>] (do_devconfig_ioctl) from [<813a36b8>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83b38000 r7:200000c0 r6:200000c0 r5:84158900 r4:8554a780 [<813a30dc>] (comedi_unlocked_ioctl) from [<8056ce5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a30dc>] (comedi_unlocked_ioctl) from [<8056ce5c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a30dc>] (comedi_unlocked_ioctl) from [<8056ce5c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a30dc>] (comedi_unlocked_ioctl) from [<8056ce5c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83b38000 r9:00000003 r8:8554a780 r7:200000c0 r6:8554a781 r5:00000000 r4:40946400 [<8056cd2c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb09fa8 to 0xdfb09ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76ff20bc 9fe0: 76ff1ec0 76ff1eb0 0001948c 001322c0 r10:00000036 r9:83b38000 r8:8020029c r7:00000036 r6:002f6308 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