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: 20350 Comm: syz.3.4242 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 : [<814939d4>] lr : [<814939c4>] psr: 60000013 sp : e03c5d30 ip : e03c5d30 fp : e03c5d54 r10: 82d30dfc r9 : 00000003 r8 : 84785cc0 r7 : e03c5d90 r6 : 84785cc0 r5 : 00000000 r4 : 00000000 r3 : fee02f00 r2 : 81e2dee8 r1 : 00000001 r0 : 81493634 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86574280 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 84785cc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe03c4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 84785cc0 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 0xe03c4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xe03c4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.3.4242 (pid: 20350, stack limit = 0xe03c4000) Stack: (0xe03c5d30 to 0xe03c6000) 5d20: 824d49fc 84785cc0 82bd8ea0 82bd8ea0 5d40: 81e2e3a8 00000000 e03c5d8c e03c5d58 8148f550 8149385c 40946400 00000000 5d60: e03c5d7c 20000300 84785cc0 b5403587 40946400 00000001 00000004 8497c980 5d80: e03c5e4c e03c5d90 8148ad54 8148f454 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00002f00 00000005 0000d09a ffffffff 00000003 fffffffe 20000004 5dc0: 00000003 00000ffe 7fffffff 0000000c 00000002 00000004 00000008 0000ffff 5de0: 00000006 00000005 000007ff 00000830 00000008 00010000 00000009 00000800 5e00: 00000101 00000002 00008001 00000007 00000003 00000004 00000005 0000070f 5e20: 00000000 028fb332 00000000 84fdb780 84785cc0 20000300 40946400 00000001 5e40: e03c5f14 e03c5e50 8148c07c 8148ac94 00000000 028fb332 00000000 00000000 5e60: 8254980c e03c5ea4 0000005f 849405e0 00000064 84785cf0 e03c5ee4 e03c5e88 5e80: 80806188 807fc404 00000064 00000001 00000000 e03c5ea4 85ce9310 83438908 5ea0: 00006400 0000000b e03c5e98 00000000 00000000 028fb332 00000000 84fdb780 5ec0: 40946400 20000300 20000300 84fdb780 00000004 8497c980 e03c5ef4 e03c5ee8 5ee0: 808062bc 028fb332 e03c5f14 00000000 84fdb781 40946400 20000300 84fdb780 5f00: 00000004 8497c980 e03c5fa4 e03c5f18 805bab28 8148bd34 ecac8b10 8497c980 5f20: e03c5f3c e03c5f30 81b58480 81b5834c e03c5f54 e03c5f40 8025a7a8 8028e490 5f40: e03c5fb0 40000000 e03c5f84 e03c5f58 80220bdc 8025a764 00000000 82a1eb0c 5f60: e03c5fb0 0013ea70 ecac8b10 80220b30 00000000 028fb332 e03c5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 8497c980 00000036 00000000 e03c5fa8 5fa0: 80200060 805ba8f0 00000000 00000000 00000004 40946400 20000300 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f560dc 5fe0: 76f55e88 76f55e78 00018ebc 001308d0 60000010 00000004 00000000 00000000 Call trace: [<81493850>] (parport_attach) from [<8148f550>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e3a8 r4:82bd8ea0 [<8148f448>] (comedi_device_attach) from [<8148ad54>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8497c980 r9:00000004 r8:00000001 r7:40946400 r6:b5403587 r5:84785cc0 r4:20000300 [<8148ac88>] (do_devconfig_ioctl) from [<8148c07c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000300 r5:84785cc0 r4:84fdb780 [<8148bd28>] (comedi_unlocked_ioctl) from [<805bab28>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148bd28>] (comedi_unlocked_ioctl) from [<805bab28>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148bd28>] (comedi_unlocked_ioctl) from [<805bab28>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148bd28>] (comedi_unlocked_ioctl) from [<805bab28>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8497c980 r9:00000004 r8:84fdb780 r7:20000300 r6:40946400 r5:84fdb781 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe03c5fa8 to 0xe03c5ff0) 5fa0: 00000000 00000000 00000004 40946400 20000300 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f560dc 5fe0: 76f55e88 76f55e78 00018ebc 001308d0 r10:00000036 r9:8497c980 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