8<--- cut here --- Unable to handle kernel paging request at virtual address fee00103 when write [fee00103] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 32757 Comm: syz.5.5466 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 subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<814a1578>] lr : [<814a1564>] psr: 60000013 sp : e035dcb8 ip : e035dcb8 fp : e035dcd4 r10: 00000100 r9 : 00000004 r8 : e035dda4 r7 : 00000000 r6 : 0000009b r5 : 8301a840 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8301a840 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 90f419c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301a840 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8301a840 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xe035c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xe035c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xe035c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.5.5466 (pid: 32757, stack limit = 0xe035c000) Stack: (0xe035dcb8 to 0xe035e000) dca0: 814a1518 00000100 dcc0: 8301a840 00000000 e035dcf4 e035dcd8 814a1254 814a1524 00000100 80546260 dce0: 85c58000 85c58000 e035dd14 e035dcf8 814a160c 814a1208 8301a840 00000000 dd00: 85c58000 00000000 e035dd54 e035dd18 814a17bc 814a1590 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd965c 8301a840 00000000 e035dd90 8301a840 dd40: 00000000 82d30dfc e035dd8c e035dd58 81490160 814a1754 40946400 00000000 dd60: e035dd7c 20000240 8301a840 b5403587 40946400 00000003 00000003 8a5aee40 dd80: e035de4c e035dd90 8148b964 81490064 35353238 00000000 00000000 00000000 dda0: 00000000 00000100 00000004 00013600 00000006 0000002f 00010005 00000079 ddc0: 00000003 00080008 00000005 00000002 04000064 00000007 00000001 00000006 dde0: 000000fd 00000006 00000000 00000003 00000007 0000b740 0000ca9f 00000006 de00: 20001e58 00000008 0000f39e 00000003 1539b804 00000007 00000001 00000002 de20: 00000000 6f38a1cf 00000000 99fec280 8301a840 20000240 40946400 00000003 de40: e035df14 e035de50 8148cc8c 8148b8a4 00000000 6f38a1cf 00000000 00000000 de60: 82549844 e035dea4 0000005f 845b4230 00000064 8301a870 e035dee4 e035de88 de80: 80806284 807fc93c 00000064 00000001 00000000 e035dea4 85267510 834f5088 dea0: 00006400 0000000b e035de98 00000000 00000000 6f38a1cf 00000000 99fec280 dec0: 40946400 20000240 20000240 99fec280 00000003 8a5aee40 e035def4 e035dee8 dee0: 808063b8 6f38a1cf e035df14 00000000 99fec281 40946400 20000240 99fec280 df00: 00000003 8a5aee40 e035dfa4 e035df18 805baf1c 8148c944 ecac8b10 8a5aee40 df20: e035df3c e035df30 81b5a7a0 81b5a66c e035df54 e035df40 8025a7a8 8028e490 df40: e035dfb0 40000000 e035df84 e035df58 80220bdc 8025a764 00000000 82a1eb0c df60: e035dfb0 0013ea70 ecac8b10 80220b30 00000000 6f38a1cf e035dfac 00000000 df80: 00000000 00356310 00000036 8020029c 8a5aee40 00000036 00000000 e035dfa8 dfa0: 80200060 805bace4 00000000 00000000 00000003 40946400 20000240 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f820dc dfe0: 76f81e88 76f81e78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<814a1518>] (subdev_8255_io) from [<814a1254>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301a840 r5:00000100 r4:814a1518 [<814a11fc>] (subdev_8255_do_config) from [<814a160c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a11fc>] (subdev_8255_do_config) from [<814a160c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85c58000 [<814a1584>] (subdev_8255_io_init) from [<814a17bc>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a1584>] (subdev_8255_io_init) from [<814a17bc>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85c58000 r5:00000000 r4:8301a840 [<814a1748>] (dev_8255_attach) from [<81490160>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8301a840 r7:e035dd90 r6:00000000 r5:8301a840 r4:82bd965c [<81490058>] (comedi_device_attach) from [<8148b964>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8a5aee40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301a840 r4:20000240 [<8148b898>] (do_devconfig_ioctl) from [<8148cc8c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000240 r5:8301a840 r4:99fec280 [<8148c938>] (comedi_unlocked_ioctl) from [<805baf1c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148c938>] (comedi_unlocked_ioctl) from [<805baf1c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148c938>] (comedi_unlocked_ioctl) from [<805baf1c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148c938>] (comedi_unlocked_ioctl) from [<805baf1c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8a5aee40 r9:00000003 r8:99fec280 r7:20000240 r6:40946400 r5:99fec281 r4:00000000 [<805bacd8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe035dfa8 to 0xe035dff0) dfa0: 00000000 00000000 00000003 40946400 20000240 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f820dc dfe0: 76f81e88 76f81e78 00018ebc 001308d0 r10:00000036 r9:8a5aee40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction