8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f29 when write [fee04f29] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 3912 Comm: syz.1.25 Not tainted 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 : [<813abc98>] lr : [<813abc88>] psr: 60000013 sp : dfde9d30 ip : dfde9d30 fp : dfde9d54 r10: 82b16f40 r9 : 00000003 r8 : 83ce0d80 r7 : dfde9d90 r6 : 83ce0d80 r5 : 00000000 r4 : 00000000 r3 : fee04f29 r2 : 81e15484 r1 : 00000001 r0 : 813ab908 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84a23600 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 83ce0d80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfde8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83ce0d80 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 0xdfde8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfde8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.25 (pid: 3912, stack limit = 0xdfde8000) Stack: (0xdfde9d30 to 0xdfdea000) 9d20: 823fe6c8 83ce0d80 829cf9ac 829cf9ac 9d40: 81e15944 83ce0dc4 dfde9d8c dfde9d58 813a7d34 813abb30 20000280 00000000 9d60: dfde9d7c 20000280 83ce0d80 b5403587 20000280 83b3e000 40946400 00000003 9d80: dfde9e4c dfde9d90 813a3880 813a7c38 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f29 00000005 000003ff 00000601 00000001 00000cc7 00000fff 9dc0: 5c952399 00000805 000007ff 00000002 00000001 00000002 00000004 00000001 9de0: 00000000 00000005 0001a44b 00000003 00000201 00000be8 fffffff9 00000009 9e00: 20001e56 00000009 02000003 0000003c 00000008 00000004 08000000 00000001 9e20: 00000000 35b42fc8 00000000 84957d80 83ce0d80 20000280 20000280 83b3e000 9e40: dfde9f14 dfde9e50 813a484c 813a378c 00000000 00000000 00000000 35b42fc8 9e60: 00000000 00000000 8247054c 0000005f 84023a58 83ce0db0 842bf4d4 83b3e000 9e80: dfde9ee4 dfde9e90 80797aa4 8078de08 00000064 00000001 00000000 dfde9eac 9ea0: 848e16d0 83424c38 00006400 0000000b dfde9ea0 00000000 00000000 35b42fc8 9ec0: 84957d80 40946400 20000280 20000280 84957d80 00000003 dfde9ef4 dfde9ee8 9ee0: 80797bc4 35b42fc8 dfde9f14 40946400 00000000 84957d81 20000280 84957d80 9f00: 00000003 83b3e000 dfde9fa4 dfde9f18 8056cdc8 813a427c ecac8b10 83b3e000 9f20: dfde9f3c dfde9f30 81a39db8 81a39c88 dfde9f54 dfde9f40 8025e490 8028ef6c 9f40: dfde9fb0 40000000 dfde9f84 dfde9f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfde9fb0 0014c820 ecac8b10 80222940 00000000 35b42fc8 dfde9fac 00000000 9f80: 00000000 002f6308 00000036 8020029c 83b3e000 00000036 00000000 dfde9fa8 9fa0: 80200060 8056cca4 00000000 00000000 00000003 40946400 20000280 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fa90bc 9fe0: 76fa8ec0 76fa8eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813abb24>] (parport_attach) from [<813a7d34>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83ce0dc4 r5:81e15944 r4:829cf9ac [<813a7c2c>] (comedi_device_attach) from [<813a3880>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b3e000 r7:20000280 r6:b5403587 r5:83ce0d80 r4:20000280 [<813a3780>] (do_devconfig_ioctl) from [<813a484c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b3e000 r7:20000280 r6:20000280 r5:83ce0d80 r4:84957d80 [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83b3e000 r9:00000003 r8:84957d80 r7:20000280 r6:84957d81 r5:00000000 r4:40946400 [<8056cc98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfde9fa8 to 0xdfde9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000280 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fa90bc 9fe0: 76fa8ec0 76fa8eb0 0001948c 001322c0 r10:00000036 r9:83b3e000 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