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: 5770 Comm: syz.2.507 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 : [<813abcd0>] lr : [<813abcc0>] psr: 60000013 sp : dfafdd30 ip : dfafdd30 fp : dfafdd54 r10: 82b16f40 r9 : 00000003 r8 : 841b3f00 r7 : dfafdd90 r6 : 841b3f00 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15484 r1 : 00000001 r0 : 813ab940 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 858fef00 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 841b3f00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfafc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 841b3f00 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 0xdfafc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfafc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.2.507 (pid: 5770, stack limit = 0xdfafc000) Stack: (0xdfafdd30 to 0xdfafe000) dd20: 823fe6cc 841b3f00 829cf9ac 829cf9ac dd40: 81e15944 841b3f44 dfafdd8c dfafdd58 813a7d68 813abb68 20000280 00000000 dd60: dfafdd7c 20000280 841b3f00 b5403587 20000280 85406000 40946400 00000003 dd80: dfafde4c dfafdd90 813a38b4 813a7c6c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 0000000b 000000cd 00000400 00000001 00000cc7 00000005 ddc0: 5c95239b 00000005 000003ff 7fffffff 00001600 00000003 00040009 00000005 dde0: 0000e1cb 00000006 ffffffff 00000003 00000003 00000085 fffffffd fffffffd de00: fffffff5 00000006 00200003 2000003c 00000004 00003528 00000002 00000003 de20: 00000000 c1162ac2 00000000 85d036c0 841b3f00 20000280 20000280 85406000 de40: dfafdf14 dfafde50 813a4880 813a37c0 00000000 00000000 00000000 c1162ac2 de60: 00000000 00000000 8247054c 0000005f 83ff3258 841b3f30 841fb054 85406000 de80: dfafdee4 dfafde90 80797aa4 8078de08 00000064 00000001 00000000 dfafdeac dea0: 8596a910 8342d6e8 00006400 0000000b dfafdea0 00000000 00000000 c1162ac2 dec0: 85d036c0 40946400 20000280 20000280 85d036c0 00000003 dfafdef4 dfafdee8 dee0: 80797bc4 c1162ac2 dfafdf14 40946400 00000000 85d036c1 20000280 85d036c0 df00: 00000003 85406000 dfafdfa4 dfafdf18 8056cdc8 813a42b0 ecac8b10 85406000 df20: dfafdf3c dfafdf30 81a39df8 81a39cc8 dfafdf54 dfafdf40 8025e490 8028ef6c df40: dfafdfb0 40000000 dfafdf84 dfafdf58 802229ec 8025e44c 00000000 8281cddc df60: dfafdfb0 0014c820 ecac8b10 80222940 00000000 c1162ac2 dfafdfac 00000000 df80: 00000000 002f6308 00000036 8020029c 85406000 00000036 00000000 dfafdfa8 dfa0: 80200060 8056cca4 00000000 00000000 00000003 40946400 20000280 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f170bc dfe0: 76f16ec0 76f16eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813abb5c>] (parport_attach) from [<813a7d68>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841b3f44 r5:81e15944 r4:829cf9ac [<813a7c60>] (comedi_device_attach) from [<813a38b4>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85406000 r7:20000280 r6:b5403587 r5:841b3f00 r4:20000280 [<813a37b4>] (do_devconfig_ioctl) from [<813a4880>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85406000 r7:20000280 r6:20000280 r5:841b3f00 r4:85d036c0 [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85406000 r9:00000003 r8:85d036c0 r7:20000280 r6:85d036c1 r5:00000000 r4:40946400 [<8056cc98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfafdfa8 to 0xdfafdff0) dfa0: 00000000 00000000 00000003 40946400 20000280 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f170bc dfe0: 76f16ec0 76f16eb0 0001948c 001322c0 r10:00000036 r9:85406000 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