8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f00 when write [fee02f00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 8706 Comm: syz.0.1119 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 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 : [<813aaec8>] lr : [<813aaeb8>] psr: 60000013 sp : dfaa5d30 ip : dfaa5d30 fp : dfaa5d54 r10: 82b16f00 r9 : 00000003 r8 : 84208cc0 r7 : dfaa5d90 r6 : 84208cc0 r5 : 00000000 r4 : 00000000 r3 : fee02f00 r2 : 81e15444 r1 : 00000001 r0 : 813aab38 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84fd1940 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 84208cc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfaa4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84208cc0 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 0xdfaa4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfaa4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.1119 (pid: 8706, stack limit = 0xdfaa4000) Stack: (0xdfaa5d30 to 0xdfaa6000) 5d20: 823fe320 84208cc0 829cf8ec 829cf8ec 5d40: 81e15904 84208d04 dfaa5d8c dfaa5d58 813a6f60 813aad60 200000c0 00000000 5d60: dfaa5d7c 200000c0 84208cc0 b5403587 200000c0 83aeb000 40946400 00000001 5d80: dfaa5e4c dfaa5d90 813a2ae0 813a6e64 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 5dc0: 00000003 00000ffe 7fffffff 0000000c 00000002 00000001 00000008 0000ffff 5de0: 00000006 00000005 00000008 00000009 00000008 00010000 00000009 00000800 5e00: 00000101 00000002 00008001 00000007 00000003 00000004 00000005 00000007 5e20: 00000000 1204b0f1 00000000 8480a6c0 84208cc0 200000c0 200000c0 83aeb000 5e40: dfaa5f14 dfaa5e50 813a3aac 813a29ec 00000000 00000000 00000000 1204b0f1 5e60: 00000000 00000000 8247054c 0000005f 8406a458 84208cf0 841b0834 83aeb000 5e80: dfaa5ee4 dfaa5e90 80797824 8078db88 00000064 00000001 00000000 dfaa5eac 5ea0: 84fda250 834e6b28 00006400 0000000b dfaa5ea0 00000000 00000000 1204b0f1 5ec0: 8480a6c0 40946400 200000c0 200000c0 8480a6c0 00000003 dfaa5ef4 dfaa5ee8 5ee0: 80797944 1204b0f1 dfaa5f14 40946400 00000000 8480a6c1 200000c0 8480a6c0 5f00: 00000003 83aeb000 dfaa5fa4 dfaa5f18 8056cdf8 813a34dc ecac8b10 83aeb000 5f20: dfaa5f3c dfaa5f30 81a38778 81a38648 dfaa5f54 dfaa5f40 8025e490 8028ef8c 5f40: dfaa5fb0 40000000 dfaa5f84 dfaa5f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfaa5fb0 0014c820 ecac8b10 80222940 00000000 1204b0f1 dfaa5fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 83aeb000 00000036 00000000 dfaa5fa8 5fa0: 80200060 8056ccd4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f7f0bc 5fe0: 76f7eec0 76f7eeb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aad54>] (parport_attach) from [<813a6f60>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:84208d04 r5:81e15904 r4:829cf8ec [<813a6e58>] (comedi_device_attach) from [<813a2ae0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000001 r9:40946400 r8:83aeb000 r7:200000c0 r6:b5403587 r5:84208cc0 r4:200000c0 [<813a29e0>] (do_devconfig_ioctl) from [<813a3aac>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83aeb000 r7:200000c0 r6:200000c0 r5:84208cc0 r4:8480a6c0 [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a34d0>] (comedi_unlocked_ioctl) from [<8056cdf8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83aeb000 r9:00000003 r8:8480a6c0 r7:200000c0 r6:8480a6c1 r5:00000000 r4:40946400 [<8056ccc8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfaa5fa8 to 0xdfaa5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f7f0bc 5fe0: 76f7eec0 76f7eeb0 0001948c 001322c0 r10:00000036 r9:83aeb000 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