8<--- cut here --- Unable to handle kernel paging request at virtual address fee00100 when write [fee00100] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6864 Comm: syz.3.432 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81493794>] lr : [<81493784>] psr: 60000013 sp : ea771d30 ip : ea771d30 fp : ea771d54 r10: 82d30dfc r9 : 00000003 r8 : 8315bc00 r7 : ea771d90 r6 : 8315bc00 r5 : 00000000 r4 : 00000000 r3 : fee00100 r2 : 81e2dee8 r1 : 00000001 r0 : 814933f4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86852040 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8315bc00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea770000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 8315bc00 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 0xea770000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xea770000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.3.432 (pid: 6864, stack limit = 0xea770000) Stack: (0xea771d30 to 0xea772000) 1d20: 824d49b8 8315bc00 82bd8ea0 82bd8ea0 1d40: 81e2e3a8 00000000 ea771d8c ea771d58 8148f310 8149361c b5403587 00000000 1d60: 00000000 200000c0 8315bc00 b5403587 40946400 00000000 00000003 84e524c0 1d80: ea771e4c ea771d90 8148ab14 8148f214 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000100 00004005 00000300 000000e1 0000000e 00000001 00000069 1dc0: 00010000 00000003 00000000 00000009 00000005 00000007 00000001 00000001 1de0: 000000fd fffffff4 000107ff 00000002 00000004 00000089 000007ff 00080000 1e00: 20001e58 000007ff 0000f39d 00000006 00000008 0000a4b5 00000000 fffffff8 1e20: 00000000 7361698e 84e524c0 85313d00 8315bc00 200000c0 40946400 00000000 1e40: ea771f14 ea771e50 8148be3c 8148aa54 00000000 7361698e 00000000 00000000 1e60: 8254980c ea771ea4 0000005f 8429fc00 00000064 8315bc30 ea771ee4 ea771e88 1e80: 80806188 807fc404 00000064 00000001 00000000 ea771ea4 8586fe10 834fa220 1ea0: 00006400 0000000b ea771e98 00000000 00000000 7361698e 00000000 85313d00 1ec0: 40946400 200000c0 200000c0 85313d00 00000003 84e524c0 ea771ef4 ea771ee8 1ee0: 808062bc 7361698e ea771f14 00000000 85313d01 40946400 200000c0 85313d00 1f00: 00000003 84e524c0 ea771fa4 ea771f18 805bab28 8148baf4 ecac8b10 84e524c0 1f20: ea771f3c ea771f30 81b58240 81b5810c ea771f54 ea771f40 8025a7a8 8028e490 1f40: ea771fb0 40000000 ea771f84 ea771f58 80220bdc 8025a764 00000000 82a1eb0c 1f60: ea771fb0 0013e9c0 ecac8b10 80220b30 00000000 7361698e ea771fac 00000000 1f80: 00000000 00356310 00000036 8020029c 84e524c0 00000036 00000000 ea771fa8 1fa0: 80200060 805ba8f0 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f1f0dc 1fe0: 76f1ee88 76f1ee78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81493610>] (parport_attach) from [<8148f310>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e3a8 r4:82bd8ea0 [<8148f208>] (comedi_device_attach) from [<8148ab14>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84e524c0 r9:00000003 r8:00000000 r7:40946400 r6:b5403587 r5:8315bc00 r4:200000c0 [<8148aa48>] (do_devconfig_ioctl) from [<8148be3c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000000 r7:40946400 r6:200000c0 r5:8315bc00 r4:85313d00 [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148bae8>] (comedi_unlocked_ioctl) from [<805bab28>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84e524c0 r9:00000003 r8:85313d00 r7:200000c0 r6:40946400 r5:85313d01 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea771fa8 to 0xea771ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f1f0dc 1fe0: 76f1ee88 76f1ee78 00018ebc 00130820 r10:00000036 r9:84e524c0 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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