netlink: 36 bytes leftover after parsing attributes in process `syz.0.1644'. 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00100 when write [fee00100] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 9365 Comm: syz.0.1644 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 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 : [<8144d8ec>] lr : [<8144d8dc>] psr: 60000013 sp : dfdd1d30 ip : dfdd1d30 fp : dfdd1d54 r10: 82d2bdc4 r9 : 00000003 r8 : 8334b9c0 r7 : dfdd1d90 r6 : 8334b9c0 r5 : 00000000 r4 : 00000000 r3 : fee00100 r2 : 81e274c8 r1 : 00000001 r0 : 8144d54c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 859c9b80 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 8334b9c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfdd0000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r8 information: slab kmalloc-192 start 8334b9c0 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 0xdfdd0000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r12 information: 2-page vmalloc region starting at 0xdfdd0000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Process syz.0.1644 (pid: 9365, stack limit = 0xdfdd0000) Stack: (0xdfdd1d30 to 0xdfdd2000) 1d20: 824ba6e0 8334b9c0 00000000 82bd26e0 1d40: 81e27988 00000000 dfdd1d8c dfdd1d58 8144944c 8144d774 40946400 00000000 1d60: dfdd1d7c 200000c0 8334b9c0 b5403587 40946400 00000003 00000006 84764980 1d80: dfdd1e4c dfdd1d90 81444c58 81449350 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000100 00000e04 00000002 0000000c 0000000e 00000002 00000079 1dc0: 00000080 00080008 00000007 00000002 00000001 00000007 fffffffd 00000001 1de0: 000000fb fffffff7 00008007 000000be 7fffffff 00000089 00008001 00000000 1e00: 00000fff ffffffff 00000001 00000003 00000008 0000a6b5 00000000 fffffff8 1e20: 00000000 b24f0a3d 00000000 86197000 8334b9c0 200000c0 40946400 00000003 1e40: dfdd1f14 dfdd1e50 81445f7c 81444b90 00000000 b24f0a3d 00000000 00000000 1e60: 8252e804 dfdd1ea4 0000005f 841d4f18 00000064 8334b9f0 dfdd1ee4 dfdd1e88 1e80: 807df06c 807d539c 00000064 00000001 00000000 dfdd1ea4 830e8550 834e3220 1ea0: 00006400 0000000b dfdd1e98 00000000 00000000 b24f0a3d 828d3480 86197000 1ec0: 40946400 200000c0 200000c0 86197000 00000006 84764980 dfdd1ef4 dfdd1ee8 1ee0: 807df1a0 b24f0a3d dfdd1f14 00000000 86197001 40946400 200000c0 86197000 1f00: 00000006 84764980 dfdd1fa4 dfdd1f18 8059c134 81445c34 dfdd1f3c dfdd1f28 1f20: 8025a484 802272b0 84764980 00000001 dfdd1f54 dfdd1f40 8025a4dc 8028c2bc 1f40: dfdd1fb0 40000000 dfdd1f84 dfdd1f58 80220be0 8025a498 00000000 82a1c33c 1f60: dfdd1fb0 0013e940 ecac8b10 80220b34 00000000 b24f0a3d dfdd1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 84764980 00000036 00000000 dfdd1fa8 1fa0: 80200060 8059befc 00000000 00000000 00000006 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f950dc 1fe0: 76f94e88 76f94e78 00018e58 001307a0 60000010 00000006 00000000 00000000 Call trace: [<8144d768>] (parport_attach) from [<8144944c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27988 r4:82bd26e0 [<81449344>] (comedi_device_attach) from [<81444c58>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84764980 r9:00000006 r8:00000003 r7:40946400 r6:b5403587 r5:8334b9c0 r4:200000c0 [<81444b84>] (do_devconfig_ioctl) from [<81445f7c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:8334b9c0 r4:86197000 [<81445c28>] (comedi_unlocked_ioctl) from [<8059c134>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81445c28>] (comedi_unlocked_ioctl) from [<8059c134>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81445c28>] (comedi_unlocked_ioctl) from [<8059c134>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81445c28>] (comedi_unlocked_ioctl) from [<8059c134>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84764980 r9:00000006 r8:86197000 r7:200000c0 r6:40946400 r5:86197001 r4:00000000 [<8059bef0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdd1fa8 to 0xdfdd1ff0) 1fa0: 00000000 00000000 00000006 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f950dc 1fe0: 76f94e88 76f94e78 00018e58 001307a0 r10:00000036 r9:84764980 r8:8020029c r7:00000036 r6:00346310 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