8<--- cut here --- Unable to handle kernel paging request at virtual address fee00143 when write [fee00143] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 22846 Comm: syz.1.2798 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 : [<814a0728>] lr : [<814a0714>] psr: 60000013 sp : dfb51cb8 ip : dfb51cb8 fp : dfb51cd4 r10: 00000140 r9 : 00000004 r8 : dfb51da4 r7 : 00000000 r6 : 0000009b r5 : 842720c0 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 842720c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 873dc1c0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 842720c0 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 842720c0 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 0xdfb50000 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 0xdfb50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfb50000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.1.2798 (pid: 22846, stack limit = 0xdfb50000) Stack: (0xdfb51cb8 to 0xdfb52000) 1ca0: 814a06c8 00000140 1cc0: 842720c0 00000000 dfb51cf4 dfb51cd8 814a0404 814a06d4 00000140 80546014 1ce0: 85ce1800 85ce1800 dfb51d14 dfb51cf8 814a07bc 814a03b8 842720c0 00000000 1d00: 85ce1800 00000000 dfb51d54 dfb51d18 814a096c 814a0740 ffffffff 00000004 1d20: 82a22dc0 00000000 00000000 82bd965c 842720c0 00000000 dfb51d90 842720c0 1d40: 00000000 82d30dfc dfb51d8c dfb51d58 8148f310 814a0904 40946400 00000000 1d60: dfb51d7c 200000c0 842720c0 b5403587 40946400 00000002 00000003 86a555c0 1d80: dfb51e4c dfb51d90 8148ab14 8148f214 35353238 00000000 00000000 00000000 1da0: 00000000 00000140 00000009 00000007 00000002 10000007 00000007 00008002 1dc0: 00008000 00000007 0000c72d 00000000 00000007 00000003 0000000a 00000029 1de0: 000072ef 00000101 00000006 00000006 00000005 00000004 00000006 00000006 1e00: 00000009 00001000 00000008 00000471 ffffff7f 00000383 00008001 00000004 1e20: 00000000 c4f86980 00000000 85b4be00 842720c0 200000c0 40946400 00000002 1e40: dfb51f14 dfb51e50 8148be3c 8148aa54 00000000 c4f86980 00000000 00000000 1e60: 8254980c dfb51ea4 0000005f 84583a28 00000064 842720f0 dfb51ee4 dfb51e88 1e80: 80806188 807fc404 00000064 00000001 00000000 dfb51ea4 867ace10 834123b8 1ea0: 00006400 0000000b dfb51e98 00000000 00000000 c4f86980 00000000 85b4be00 1ec0: 40946400 200000c0 200000c0 85b4be00 00000003 86a555c0 dfb51ef4 dfb51ee8 1ee0: 808062bc c4f86980 dfb51f14 00000000 85b4be01 40946400 200000c0 85b4be00 1f00: 00000003 86a555c0 dfb51fa4 dfb51f18 805bab28 8148baf4 ecac8b10 86a555c0 1f20: dfb51f3c dfb51f30 81b58220 81b580ec dfb51f54 dfb51f40 8025a7a8 8028e490 1f40: dfb51fb0 40000000 dfb51f84 dfb51f58 80220bdc 8025a764 00000000 82a1eb0c 1f60: dfb51fb0 0013e9c0 ecac8b10 80220b30 00000000 c4f86980 dfb51fac 00000000 1f80: 00000000 00356310 00000036 8020029c 86a555c0 00000036 00000000 dfb51fa8 1fa0: 80200060 805ba8f0 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f2a0dc 1fe0: 76f29e88 76f29e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<814a06c8>] (subdev_8255_io) from [<814a0404>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:842720c0 r5:00000140 r4:814a06c8 [<814a03ac>] (subdev_8255_do_config) from [<814a07bc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a03ac>] (subdev_8255_do_config) from [<814a07bc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85ce1800 [<814a0734>] (subdev_8255_io_init) from [<814a096c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a0734>] (subdev_8255_io_init) from [<814a096c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85ce1800 r5:00000000 r4:842720c0 [<814a08f8>] (dev_8255_attach) from [<8148f310>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:842720c0 r7:dfb51d90 r6:00000000 r5:842720c0 r4:82bd965c [<8148f208>] (comedi_device_attach) from [<8148ab14>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:86a555c0 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:842720c0 r4:200000c0 [<8148aa48>] (do_devconfig_ioctl) from [<8148be3c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200000c0 r5:842720c0 r4:85b4be00 [<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) r10:86a555c0 r9:00000003 r8:85b4be00 r7:200000c0 r6:40946400 r5:85b4be01 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb51fa8 to 0xdfb51ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f2a0dc 1fe0: 76f29e88 76f29e78 00018ebc 00130820 r10:00000036 r9:86a555c0 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