8<--- cut here --- Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 23142 Comm: syz.4.5512 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 : [<814938dc>] lr : [<814938cc>] psr: 60000013 sp : dfb41d30 ip : dfb41d30 fp : dfb41d54 r10: 82d30dfc r9 : 00000003 r8 : 8301ac00 r7 : dfb41d90 r6 : 8301ac00 r5 : 00000000 r4 : 00000000 r3 : fee00140 r2 : 81e2dee8 r1 : 00000001 r0 : 8149353c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 853a08c0 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8301ac00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb40000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 8301ac00 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 0xdfb40000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfb40000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.4.5512 (pid: 23142, stack limit = 0xdfb40000) Stack: (0xdfb41d30 to 0xdfb42000) 1d20: 824d49b8 8301ac00 82bd8ea0 82bd8ea0 1d40: 81e2e3a8 00000000 dfb41d8c dfb41d58 8148f458 81493764 40946400 00000000 1d60: dfb41d7c 200003c0 8301ac00 b5403587 40946400 00000002 00000003 852c3d40 1d80: dfb41e4c dfb41d90 8148ac5c 8148f35c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000140 fffffffc 0001000c 0000dddc 00000000 00010000 00007fff 1dc0: 00000006 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce 1de0: 00008e99 00000001 000000ed 00000006 00000008 00000004 00000000 0000000a 1e00: 00000009 00000ffd 00000009 000000af 00000002 00000283 00008001 0000e43f 1e20: 00000000 85a33af4 00000000 84f6ea00 8301ac00 200003c0 40946400 00000002 1e40: dfb41f14 dfb41e50 8148bf84 8148ab9c dfb41e4c 85a33af4 00000000 00000000 1e60: 8254980c dfb41ea4 0000005f 844c7c00 00000064 8301ac30 dfb41ee4 dfb41e88 1e80: 80806188 807fc404 00000064 00000001 00000000 dfb41ea4 86bab310 834282a8 1ea0: 00006400 0000000b dfb41e98 00000000 dfb41d38 85a33af4 00000000 84f6ea00 1ec0: 40946400 200003c0 200003c0 84f6ea00 00000003 852c3d40 dfb41ef4 dfb41ee8 1ee0: 808062bc 85a33af4 dfb41f14 00000000 84f6ea01 40946400 200003c0 84f6ea00 1f00: 00000003 852c3d40 dfb41fa4 dfb41f18 805bab28 8148bc3c ecac8b10 852c3d40 1f20: dfb41f3c dfb41f30 81b58380 81b5824c dfb41f54 dfb41f40 8025a7a8 8028e490 1f40: dfb41fb0 40000000 dfb41f84 dfb41f58 80220bdc 8025a764 00000000 82a1eb0c 1f60: dfb41fb0 0013ea70 ecac8b10 80220b30 00000000 85a33af4 dfb41fac 00000000 1f80: 00000000 00356310 00000036 8020029c 852c3d40 00000036 00000000 dfb41fa8 1fa0: 80200060 805ba8f0 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fc00dc 1fe0: 76fbfe88 76fbfe78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<81493758>] (parport_attach) from [<8148f458>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e3a8 r4:82bd8ea0 [<8148f350>] (comedi_device_attach) from [<8148ac5c>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:852c3d40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8301ac00 r4:200003c0 [<8148ab90>] (do_devconfig_ioctl) from [<8148bf84>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:8301ac00 r4:84f6ea00 [<8148bc30>] (comedi_unlocked_ioctl) from [<805bab28>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148bc30>] (comedi_unlocked_ioctl) from [<805bab28>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148bc30>] (comedi_unlocked_ioctl) from [<805bab28>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148bc30>] (comedi_unlocked_ioctl) from [<805bab28>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:852c3d40 r9:00000003 r8:84f6ea00 r7:200003c0 r6:40946400 r5:84f6ea01 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb41fa8 to 0xdfb41ff0) 1fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fc00dc 1fe0: 76fbfe88 76fbfe78 00018ebc 001308d0 r10:00000036 r9:852c3d40 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