8<--- cut here --- Unable to handle kernel paging request at virtual address fee0f003 when write [fee0f003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 29502 Comm: syz.1.4497 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:88 [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 : [<81468748>] lr : [<81468734>] psr: 60000013 sp : dfe19cb8 ip : dfe19cb8 fp : dfe19cd4 r10: 0000f000 r9 : 00000004 r8 : dfe19da4 r7 : 00000000 r6 : 0000009b r5 : 8301a9c0 r4 : 0000f003 r3 : 0000009b r2 : fee0f003 r1 : 00000001 r0 : 8301a9c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85340700 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301a9c0 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 8301a9c0 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 0xdfe18000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfe18000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xdfe18000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.1.4497 (pid: 29502, stack limit = 0xdfe18000) Stack: (0xdfe19cb8 to 0xdfe1a000) 9ca0: 814686e8 0000f000 9cc0: 8301a9c0 00000000 dfe19cf4 dfe19cd8 81468424 814686f4 0000f000 80532a04 9ce0: 8690e000 8690e000 dfe19d14 dfe19cf8 814687dc 814683d8 8301a9c0 00000000 9d00: 8690e000 00000000 dfe19d54 dfe19d18 8146898c 81468760 ffffffff 00000004 9d20: 82a20900 00000000 00000000 82bd2a24 8301a9c0 00000000 dfe19d90 8301a9c0 9d40: 00000000 82d29754 dfe19d8c dfe19d58 81457330 81468924 40946400 00000000 9d60: dfe19d7c 20000080 8301a9c0 b5403587 40946400 00000001 00000003 847a0c80 9d80: dfe19e4c dfe19d90 81452b3c 81457234 35353238 00000000 00000000 00000000 9da0: 00000000 0000f000 00000d7c 00000300 00002000 01000000 00000003 00000002 9dc0: 0000000f 00000ffe 00000001 00000007 0000091d 00001006 00000008 0000ffff 9de0: 00000006 00000003 000000f0 00000401 00000005 000003ff 00010000 00000800 9e00: 0000e2df 00000009 00000001 00000001 00000000 00000007 00000005 00000005 9e20: 00000000 ab2d6ca2 00000000 838f0a80 8301a9c0 20000080 40946400 00000001 9e40: dfe19f14 dfe19e50 81453e60 81452a74 00000000 ab2d6ca2 00000000 00000000 9e60: 82531804 dfe19ea4 0000005f 84300990 00000064 8301a9f0 dfe19ee4 dfe19e88 9e80: 807ea9c4 807e0cd8 00000064 00000001 00000000 dfe19ea4 830e80d0 8343a908 9ea0: 00006400 0000000b dfe19e98 00000000 00000000 ab2d6ca2 00000000 838f0a80 9ec0: 40946400 20000080 20000080 838f0a80 00000003 847a0c80 dfe19ef4 dfe19ee8 9ee0: 807eaaf8 ab2d6ca2 dfe19f14 00000000 838f0a81 40946400 20000080 838f0a80 9f00: 00000003 847a0c80 dfe19fa4 dfe19f18 805a2320 81453b18 ecac8b10 847a0c80 9f20: dfe19f3c dfe19f30 81b1af54 81b1ae20 dfe19f54 dfe19f40 8025a6ac 8028e294 9f40: dfe19fb0 40000000 dfe19f84 dfe19f58 80220be0 8025a668 00000000 82a1c63c 9f60: dfe19fb0 0013e9b0 ecac8b10 80220b34 00000000 ab2d6ca2 dfe19fac 00000000 9f80: 00000000 00346310 00000036 8020029c 847a0c80 00000036 00000000 dfe19fa8 9fa0: 80200060 805a20e8 00000000 00000000 00000003 40946400 20000080 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f9f0dc 9fe0: 76f9ee88 76f9ee78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<814686e8>] (subdev_8255_io) from [<81468424>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301a9c0 r5:0000f000 r4:814686e8 [<814683cc>] (subdev_8255_do_config) from [<814687dc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814683cc>] (subdev_8255_do_config) from [<814687dc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8690e000 [<81468754>] (subdev_8255_io_init) from [<8146898c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81468754>] (subdev_8255_io_init) from [<8146898c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8690e000 r5:00000000 r4:8301a9c0 [<81468918>] (dev_8255_attach) from [<81457330>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d29754 r9:00000000 r8:8301a9c0 r7:dfe19d90 r6:00000000 r5:8301a9c0 r4:82bd2a24 [<81457228>] (comedi_device_attach) from [<81452b3c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:847a0c80 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8301a9c0 r4:20000080 [<81452a68>] (do_devconfig_ioctl) from [<81453e60>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000080 r5:8301a9c0 r4:838f0a80 [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:847a0c80 r9:00000003 r8:838f0a80 r7:20000080 r6:40946400 r5:838f0a81 r4:00000000 [<805a20dc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe19fa8 to 0xdfe19ff0) 9fa0: 00000000 00000000 00000003 40946400 20000080 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f9f0dc 9fe0: 76f9ee88 76f9ee78 00018ebc 00130810 r10:00000036 r9:847a0c80 r8:8020029c r7:00000036 r6:00346310 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